{"id":4989,"date":"2021-01-25T15:07:34","date_gmt":"2021-01-25T07:07:34","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=4989"},"modified":"2021-01-25T15:07:34","modified_gmt":"2021-01-25T07:07:34","slug":"async-await%e7%9a%84%e5%9f%ba%e7%a1%80%e7%94%a8%e6%b3%95","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/4989","title":{"rendered":"async\/await\u7684\u57fa\u7840\u7528\u6cd5"},"content":{"rendered":"<div class=\"rEsl9f\">\n<div class=\"_2mYfmT\">\n<div class=\"s-dsoj\"><a href=\"https:\/\/www.jianshu.com\/p\/73b070eebf50\">\u539f\u6587\u5730\u5740<\/a><\/div>\n<div><\/div>\n<\/div>\n<\/div>\n<article class=\"_2rhmJa\"><strong>\u4e00\u3001async\/await\u7684\u4f18\u70b9<\/strong><\/p>\n<p><strong>1\uff09\u65b9\u4fbf\u7ea7\u8054\u8c03\u7528\uff1a<\/strong>\u5373\u8c03\u7528\u4f9d\u6b21\u53d1\u751f\u7684\u573a\u666f\uff1b<\/p>\n<p><strong>2\uff09\u540c\u6b65\u4ee3\u7801\u7f16\u5199\u65b9\u5f0f\uff1a<\/strong>\u00a0Promise\u4f7f\u7528then\u51fd\u6570\u8fdb\u884c\u94fe\u5f0f\u8c03\u7528\uff0c\u4e00\u76f4\u70b9\u70b9\u70b9\uff0c\u662f\u4e00\u79cd\u4ece\u5de6\u5411\u53f3\u7684\u6a2a\u5411\u5199\u6cd5\uff1basync\/await\u4ece\u4e0a\u5230\u4e0b\uff0c\u987a\u5e8f\u6267\u884c\uff0c\u5c31\u50cf\u5199\u540c\u6b65\u4ee3\u7801\u4e00\u6837\uff0c\u66f4\u7b26\u5408\u4ee3\u7801\u7f16\u5199\u4e60\u60ef\uff1b<\/p>\n<p><strong>3\uff09\u591a\u4e2a\u53c2\u6570\u4f20\u9012\uff1a<\/strong>\u00a0Promise\u7684then\u51fd\u6570\u53ea\u80fd\u4f20\u9012\u4e00\u4e2a\u53c2\u6570\uff0c\u867d\u7136\u53ef\u4ee5\u901a\u8fc7\u5305\u88c5\u6210\u5bf9\u8c61\u6765\u4f20\u9012\u591a\u4e2a\u53c2\u6570\uff0c\u4f46\u662f\u4f1a\u5bfc\u81f4\u4f20\u9012\u5197\u4f59\u4fe1\u606f\uff0c\u9891\u7e41\u7684\u89e3\u6790\u53c8\u91cd\u65b0\u7ec4\u5408\u53c2\u6570\uff0c\u6bd4\u8f83\u9ebb\u70e6\uff1basync\/await\u6ca1\u6709\u8fd9\u4e2a\u9650\u5236\uff0c\u53ef\u4ee5\u5f53\u505a\u666e\u901a\u7684\u5c40\u90e8\u53d8\u91cf\u6765\u5904\u7406\uff0c\u7528let\u6216\u8005const\u5b9a\u4e49\u7684\u5757\u7ea7\u53d8\u91cf\u60f3\u600e\u4e48\u7528\u5c31\u600e\u4e48\u7528\uff0c\u60f3\u5b9a\u4e49\u51e0\u4e2a\u5c31\u5b9a\u4e49\u51e0\u4e2a\uff0c\u5b8c\u5168\u6ca1\u6709\u9650\u5236\uff0c\u4e5f\u6ca1\u6709\u5197\u4f59\u5de5\u4f5c\uff1b<\/p>\n<p><strong>4\uff09\u540c\u6b65\u4ee3\u7801\u548c\u5f02\u6b65\u4ee3\u7801\u53ef\u4ee5\u4e00\u8d77\u7f16\u5199\uff1a<\/strong>\u00a0\u4f7f\u7528Promise\u7684\u65f6\u5019\u6700\u597d\u5c06\u540c\u6b65\u4ee3\u7801\u548c\u5f02\u6b65\u4ee3\u7801\u653e\u5728\u4e0d\u540c\u7684then\u8282\u70b9\u4e2d\uff0c\u8fd9\u6837\u7ed3\u6784\u66f4\u52a0\u6e05\u6670\uff1basync\/await\u6574\u4e2a\u4e66\u5199\u4e60\u60ef\u90fd\u662f\u540c\u6b65\u7684\uff0c\u4e0d\u9700\u8981\u7ea0\u7ed3\u540c\u6b65\u548c\u5f02\u6b65\u7684\u533a\u522b\uff0c\u5f53\u7136\uff0c\u5f02\u6b65\u8fc7\u7a0b\u9700\u8981\u5305\u88c5\u6210\u4e00\u4e2aPromise\u5bf9\u8c61\u653e\u5728await\u5173\u952e\u5b57\u540e\u9762\uff1b<\/p>\n<p><strong>5\uff09\u57fa\u4e8e\u534f\u7a0b\uff1a<\/strong>\u00a0Promise\u662f\u6839\u636e\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u8303\u5f0f\uff0c\u5bf9\u5f02\u6b65\u8fc7\u7a0b\u8fdb\u884c\u4e86\u4e00\u5c42\u5c01\u88c5\uff0casync\/await\u57fa\u4e8e\u534f\u7a0b\u7684\u673a\u5236\uff0c\u662f\u771f\u6b63\u7684\u201c\u4fdd\u5b58\u4e0a\u4e0b\u6587\uff0c\u63a7\u5236\u6743\u5207\u6362\u2026\u2026\u63a7\u5236\u6743\u6062\u590d\uff0c\u53d6\u56de\u4e0a\u4e0b\u6587\u201d\u8fd9\u79cd\u673a\u5236\uff0c\u662f\u5bf9\u5f02\u6b65\u8fc7\u7a0b\u66f4\u7cbe\u786e\u7684\u4e00\u79cd\u63cf\u8ff0\uff1b<\/p>\n<p><strong>6\uff09async\/await\u662f\u5bf9Promise\u7684\u4f18\u5316\uff1a<\/strong>\u00a0async\/await\u662f\u57fa\u4e8ePromise\u7684\uff0c\u662f\u8fdb\u4e00\u6b65\u7684\u4e00\u79cd\u4f18\u5316\uff0c\u4e0d\u8fc7\u5728\u5199\u4ee3\u7801\u65f6\uff0cPromise\u672c\u8eab\u7684API\u51fa\u73b0\u5f97\u5f88\u5c11\uff0c\u5f88\u63a5\u8fd1\u540c\u6b65\u4ee3\u7801\u7684\u5199\u6cd5\uff1b<\/p>\n<p><strong>\u4e8c\u3001\u534f\u7a0b<\/strong><\/p>\n<ul>\n<li>\u8fdb\u7a0b&gt;\u7ebf\u7a0b&gt;\u534f\u7a0b<\/li>\n<li>\u534f\u7a0b\u7684\u7b2c\u4e00\u5927\u4f18\u52bf\u662f\u5177\u6709\u6781\u9ad8\u7684\u6267\u884c\u6548\u7387\uff0c\u56e0\u4e3a\u5b50\u7a0b\u5e8f\u5207\u6362\u4e0d\u662f\u7ebf\u7a0b\u5207\u6362\uff0c\u800c\u662f\u7531\u7a0b\u5e8f\u81ea\u8eab\u63a7\u5236\uff0c\u56e0\u6b64\u6ca1\u6709\u7ebf\u7a0b\u5207\u6362\u7684\u5f00\u9500\uff0c\u548c\u591a\u7ebf\u7a0b\u6bd4\uff0c\u7ebf\u7a0b\u6570\u91cf\u8d8a\u591a\uff0c\u534f\u7a0b\u7684\u6027\u80fd\u4f18\u52bf\u5c31\u8d8a\u660e\u663e\uff1b<\/li>\n<li>\u534f\u7a0b\u7684\u7b2c\u4e8c\u5927\u4f18\u52bf\u662f\u4e0d\u9700\u8981\u591a\u7ebf\u7a0b\u7684\u9501\u673a\u5236\uff0c\u56e0\u4e3a\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u4e5f\u4e0d\u5b58\u5728\u540c\u65f6\u5199\u53d8\u91cf\u51b2\u7a81\uff0c\u5728\u534f\u7a0b\u4e2d\u63a7\u5236\u5171\u4eab\u8d44\u6e90\u4e0d\u52a0\u9501\uff0c\u53ea\u9700\u8981\u5224\u65ad\u72b6\u6001\u5c31\u597d\u4e86\uff0c\u6240\u4ee5\u6267\u884c\u6548\u7387\u6bd4\u591a\u7ebf\u7a0b\u9ad8\u5f88\u591a\uff1b<\/li>\n<li>\u534f\u7a0b\u770b\u4e0a\u53bb\u4e5f\u662f\u5b50\u7a0b\u5e8f\uff0c\u4f46\u6267\u884c\u8fc7\u7a0b\u4e2d\uff0c\u5728\u5b50\u7a0b\u5e8f\u5185\u90e8\u53ef\u4e2d\u65ad\uff0c\u7136\u540e\u8f6c\u800c\u6267\u884c\u522b\u7684\u5b50\u7a0b\u5e8f\uff0c\u5728\u9002\u5f53\u7684\u65f6\u5019\u518d\u8fd4\u56de\u6765\u63a5\u7740\u6267\u884c\uff0c\u9700\u8981\u6ce8\u610f\u7684\u662f\uff1a\u5728\u4e00\u4e2a\u5b50\u7a0b\u5e8f\u4e2d\u4e2d\u65ad\uff0c\u53bb\u6267\u884c\u5176\u4ed6\u5b50\u7a0b\u5e8f\uff0c\u8fd9\u5e76\u4e0d\u662f\u51fd\u6570\u8c03\u7528\uff0c\u6709\u70b9\u7c7b\u4f3c\u4e8eCPU\u7684\u4e2d\u65ad\uff1b<\/li>\n<li>\u7528\u6c7d\u8f66\u548c\u516c\u8def\u4e3e\u4e2a\u4f8b\u5b50\uff1ajs\u516c\u8def\u53ea\u662f\u5355\u884c\u9053\uff08\u4e3b\u7ebf\u7a0b\uff09\uff0c\u4f46\u662f\u6709\u5f88\u591a\u8f66\u9053\uff08\u8f85\u52a9\u7ebf\u7a0b\uff09\u90fd\u53ef\u4ee5\u6c47\u5165\u8f66\u6d41\uff08\u5f02\u6b65\u4efb\u52a1\u5b8c\u6210\u540e\u56de\u8c03\u8fdb\u5165\u4e3b\u7ebf\u7a0b\u7684\u4efb\u52a1\u961f\u5217\uff09\uff1bgenerator\u628ajs\u516c\u8def\u53d8\u6210\u4e86\u591a\u8f66\u9053\uff08\u534f\u7a0b\u5b9e\u73b0\uff09\uff0c\u4f46\u662f\u540c\u4e00\u65f6\u95f4\u53ea\u6709\u4e00\u4e2a\u8f66\u9053\u4e0a\u7684\u8f66\u80fd\u5f00\uff08\u4f9d\u7136\u5355\u7ebf\u7a0b\uff09\uff0c\u4e0d\u8fc7\u53ef\u4ee5\u81ea\u7531\u53d8\u9053\uff08\u79fb\u4ea4\u63a7\u5236\u6743\uff09\uff1b<\/li>\n<li>\u534f\u7a0b\u610f\u601d\u662f\u591a\u4e2a\u7ebf\u7a0b\u4e92\u76f8\u534f\u4f5c\uff0c\u5b8c\u6210\u5f02\u6b65\u4efb\u52a1\uff0c\u8fd0\u884c\u6d41\u7a0b\u5927\u81f4\u5982\u4e0b\uff1a<br \/>\n1\uff09\u534f\u7a0bA\u5f00\u59cb\u6267\u884c\uff1b<br \/>\n2\uff09\u534f\u7a0bA\u6267\u884c\u5230\u4e00\u534a\uff0c\u8fdb\u5165\u6682\u505c\uff0c\u6267\u884c\u6743\u8f6c\u79fb\u5230\u534f\u7a0bB\uff1b<br \/>\n3\uff09\u4e00\u6bb5\u65f6\u95f4\u540e\uff0c\u534f\u7a0bB\u4ea4\u8fd8\u6267\u884c\u6743\uff1b<br \/>\n4\uff09\u534f\u7a0bA\u6062\u590d\u6267\u884c\uff1b<\/li>\n<li>\u534f\u7a0b\u662f\u4e00\u4e2a\u65e0\u4f18\u5148\u7ea7\u7684\u5b50\u7a0b\u5e8f\u8c03\u5ea6\u7ec4\u4ef6\uff0c\u5141\u8bb8\u5b50\u7a0b\u5e8f\u5728\u7279\u5b9a\u7684\u5730\u70b9\u6302\u8d77\u6062\u590d\uff1b<\/li>\n<li>\u7ebf\u7a0b\u5305\u542b\u4e8e\u8fdb\u7a0b\uff0c\u534f\u7a0b\u5305\u542b\u4e8e\u7ebf\u7a0b\uff0c\u53ea\u8981\u5185\u5b58\u8db3\u591f\uff0c\u4e00\u4e2a\u7ebf\u7a0b\u4e2d\u53ef\u4ee5\u6709\u4efb\u610f\u591a\u4e2a\u534f\u7a0b\uff0c\u4f46\u67d0\u4e00\u4e2a\u65f6\u523b\u53ea\u80fd\u6709\u4e00\u4e2a\u534f\u7a0b\u5728\u8fd0\u884c\uff0c\u591a\u4e2a\u534f\u7a0b\u5206\u4eab\u8be5\u7ebf\u7a0b\u5206\u914d\u5230\u7684\u8ba1\u7b97\u673a\u8d44\u6e90\uff1b<\/li>\n<li>\u5c31\u5b9e\u9645\u4f7f\u7528\u7406\u89e3\u6765\u8bf4\uff0c\u534f\u7a0b\u5141\u8bb8\u6211\u4eec\u5199\u540c\u6b65\u4ee3\u7801\u7684\u903b\u8f91\uff0c\u5374\u505a\u7740\u5f02\u6b65\u7684\u4e8b\uff0c\u907f\u514d\u4e86\u56de\u8c03\u5d4c\u5957\uff0c\u4f7f\u5f97\u4ee3\u7801\u903b\u8f91\u6e05\u6670\uff1b<\/li>\n<li>\u4f55\u65f6\u6302\u8d77\uff0c\u5524\u9192\u534f\u7a0b\uff1a\u534f\u7a0b\u662f\u4e3a\u4e86\u4f7f\u7528\u5f02\u6b65\u7684\u4f18\u52bf\uff0c\u5f02\u6b65\u64cd\u4f5c\u662f\u4e3a\u4e86\u907f\u514dIO\u64cd\u4f5c\u963b\u585e\u7ebf\u7a0b\uff0c\u90a3\u4e48\u534f\u7a0b\u6302\u8d77\u7684\u65f6\u523b\u5e94\u8be5\u662f\u5f53\u524d\u534f\u7a0b\u53d1\u8d77\u5f02\u6b65\u64cd\u4f5c\u7684\u65f6\u5019\uff0c\u800c\u5524\u9192\u5e94\u8be5\u5728\u5176\u4ed6\u534f\u7a0b\u9000\u51fa\uff0c\u5e76\u4e14\u4ed6\u7684\u5f02\u6b65\u64cd\u4f5c\u5b8c\u6210\u65f6\uff1b<\/li>\n<li>\u5355\u7ebf\u7a0b\u5185\u5f00\u542f\u534f\u7a0b\uff0c\u4e00\u65e6\u9047\u5230io\uff0c\u4ece\u5e94\u7528\u7a0b\u5e8f\u7ea7\u522b\uff08\u800c\u975e\u64cd\u4f5c\u7cfb\u7edf\uff09\u63a7\u5236\u5207\u6362\u5bf9\u6bd4\u64cd\u4f5c\u7cfb\u7edf\u63a7\u5236\u7ebf\u7a0b\u7684\u5207\u6362\uff0c\u7528\u6237\u5728\u5355\u7ebf\u7a0b\u5185\u63a7\u5236\u534f\u7a0b\u7684\u5207\u6362\uff0c\u4f18\u70b9\u5982\u4e0b\uff1a<br \/>\n1\uff09\u534f\u7a0b\u7684\u5207\u6362\u5f00\u9500\u66f4\u5c0f\uff0c\u5c5e\u4e8e\u7a0b\u5e8f\u7ea7\u522b\u7684\u5207\u6362\uff0c\u64cd\u4f5c\u7cfb\u7edf\u5b8c\u5168\u611f\u77e5\u4e0d\u5230\uff0c\u56e0\u800c\u66f4\u52a0\u8f7b\u91cf\u7ea7\uff1b<br \/>\n2\uff09\u5355\u7ebf\u7a0b\u5185\u5c31\u53ef\u4ee5\u5b9e\u73b0\u5e76\u53d1\u7684\u6548\u679c\uff0c\u6700\u5927\u9650\u5ea6\u5730\u5229\u7528cpu\uff1b<\/li>\n<\/ul>\n<div class=\"_2Uzcx_\"><button class=\"VJbwyy\" type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><i class=\"anticon anticon-copy\" aria-label=\"icon: copy\"><\/i><\/button><\/p>\n<pre class=\"line-numbers  language-python\"><code class=\"  language-python\"><span class=\"token operator\">\/\/<\/span> \u4f20\u7edf\u7684\u751f\u4ea7\u8005<span class=\"token operator\">-<\/span>\u6d88\u8d39\u8005\u6a21\u578b\u662f\u4e00\u4e2a\u7ebf\u7a0b\u5199\u6d88\u606f\uff0c\u4e00\u4e2a\u7ebf\u7a0b\u53d6\u6d88\u606f\uff0c\u901a\u8fc7\u9501\u673a\u5236\u63a7\u5236\u961f\u5217\u548c\u7b49\u5f85\uff0c\u4f46\u4e00\u4e0d\u5c0f\u5fc3\u5c31\u53ef\u80fd\u6b7b\u9501\u3002\r\n\r\n<span class=\"token operator\">\/\/<\/span> \u5982\u679c\u6539\u7528\u534f\u7a0b\uff0c\u751f\u4ea7\u8005\u751f\u4ea7\u6d88\u606f\u540e\uff0c\u76f4\u63a5\u901a\u8fc7<span class=\"token keyword\">yield<\/span>\u8df3\u8f6c\u5230\u6d88\u8d39\u8005\u5f00\u59cb\u6267\u884c\uff0c\u5f85\u6d88\u8d39\u8005\u6267\u884c\u5b8c\u6bd5\u540e\uff0c\u5207\u6362\u56de\u751f\u4ea7\u8005\u7ee7\u7eed\u751f\u4ea7\uff0c\u6548\u7387\u6781\u9ad8\uff1a\r\n<span class=\"token keyword\">import<\/span> time\r\n\r\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">consumer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span>\r\n    r <span class=\"token operator\">=<\/span> <span class=\"token string\">''<\/span>\r\n    <span class=\"token keyword\">while<\/span> <span class=\"token boolean\">True<\/span><span class=\"token punctuation\">:<\/span>\r\n        n <span class=\"token operator\">=<\/span> <span class=\"token keyword\">yield<\/span> r\r\n        <span class=\"token keyword\">if<\/span> <span class=\"token keyword\">not<\/span> n<span class=\"token punctuation\">:<\/span>\r\n            <span class=\"token keyword\">return<\/span>\r\n        <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'[CONSUMER] Consuming %s...'<\/span> <span class=\"token operator\">%<\/span> n<span class=\"token punctuation\">)<\/span>\r\n        time<span class=\"token punctuation\">.<\/span>sleep<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span>\r\n        r <span class=\"token operator\">=<\/span> <span class=\"token string\">'200 OK'<\/span>\r\n\r\n<span class=\"token keyword\">def<\/span> <span class=\"token function\">produce<\/span><span class=\"token punctuation\">(<\/span>c<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span>\r\n    c<span class=\"token punctuation\">.<\/span><span class=\"token builtin\">next<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\r\n    n <span class=\"token operator\">=<\/span> <span class=\"token number\">0<\/span>\r\n    <span class=\"token keyword\">while<\/span> n <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">:<\/span>\r\n        n <span class=\"token operator\">=<\/span> n <span class=\"token operator\">+<\/span> <span class=\"token number\">1<\/span>\r\n        <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'[PRODUCER] Producing %s...'<\/span> <span class=\"token operator\">%<\/span> n<span class=\"token punctuation\">)<\/span>\r\n        r <span class=\"token operator\">=<\/span> c<span class=\"token punctuation\">.<\/span>send<span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">)<\/span>\r\n        <span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'[PRODUCER] Consumer return: %s'<\/span> <span class=\"token operator\">%<\/span> r<span class=\"token punctuation\">)<\/span>\r\n    c<span class=\"token punctuation\">.<\/span>close<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\r\n\r\n<span class=\"token keyword\">if<\/span> __name__<span class=\"token operator\">==<\/span><span class=\"token string\">'__main__'<\/span><span class=\"token punctuation\">:<\/span>\r\n    c <span class=\"token operator\">=<\/span> consumer<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>\r\n    produce<span class=\"token punctuation\">(<\/span>c<span class=\"token punctuation\">)<\/span>\r\n<\/code><\/pre>\n<\/div>\n<div class=\"_2Uzcx_\"><button class=\"VJbwyy\" type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><i class=\"anticon anticon-copy\" aria-label=\"icon: copy\"><\/i><\/button><\/p>\n<pre class=\"line-numbers  language-csharp\"><code class=\"  language-csharp\"><span class=\"token punctuation\">[<\/span><span class=\"token class-name\">PRODUCER<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token class-name\">Producing<\/span> <span class=\"token number\">1.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span>\r\n<span class=\"token punctuation\">[<\/span><span class=\"token class-name\">CONSUMER<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token class-name\">Consuming<\/span> <span class=\"token number\">1.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span>\r\n<span class=\"token punctuation\">[<\/span><span class=\"token class-name\">PRODUCER<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token class-name\">Consumer<\/span> <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">200<\/span> OK\r\n<span class=\"token punctuation\">[<\/span><span class=\"token class-name\">PRODUCER<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token class-name\">Producing<\/span> <span class=\"token number\">2.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span>\r\n<span class=\"token punctuation\">[<\/span><span class=\"token class-name\">CONSUMER<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token class-name\">Consuming<\/span> <span class=\"token number\">2.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span>\r\n<span class=\"token punctuation\">[<\/span><span class=\"token class-name\">PRODUCER<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token class-name\">Consumer<\/span> <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">200<\/span> OK\r\n<span class=\"token punctuation\">[<\/span><span class=\"token class-name\">PRODUCER<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token class-name\">Producing<\/span> <span class=\"token number\">3.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span>\r\n<span class=\"token punctuation\">[<\/span><span class=\"token class-name\">CONSUMER<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token class-name\">Consuming<\/span> <span class=\"token number\">3.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span>\r\n<span class=\"token punctuation\">[<\/span><span class=\"token class-name\">PRODUCER<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token class-name\">Consumer<\/span> <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">200<\/span> OK\r\n<span class=\"token punctuation\">[<\/span><span class=\"token class-name\">PRODUCER<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token class-name\">Producing<\/span> <span class=\"token number\">4.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span>\r\n<span class=\"token punctuation\">[<\/span><span class=\"token class-name\">CONSUMER<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token class-name\">Consuming<\/span> <span class=\"token number\">4.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span>\r\n<span class=\"token punctuation\">[<\/span><span class=\"token class-name\">PRODUCER<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token class-name\">Consumer<\/span> <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">200<\/span> OK\r\n<span class=\"token punctuation\">[<\/span><span class=\"token class-name\">PRODUCER<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token class-name\">Producing<\/span> <span class=\"token number\">5.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span>\r\n<span class=\"token punctuation\">[<\/span><span class=\"token class-name\">CONSUMER<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token class-name\">Consuming<\/span> <span class=\"token number\">5.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span>\r\n<span class=\"token punctuation\">[<\/span><span class=\"token class-name\">PRODUCER<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token class-name\">Consumer<\/span> <span class=\"token keyword\">return<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token number\">200<\/span> OK\r\n<\/code><\/pre>\n<\/div>\n<p>\u6ce8\u610f\u5230consumer\u51fd\u6570\u662f\u4e00\u4e2agenerator\uff08\u751f\u6210\u5668\uff09\uff0c\u628a\u4e00\u4e2aconsumer\u4f20\u5165produce\u540e\uff1a<\/p>\n<p>\u9996\u5148\u8c03\u7528c.next()\u542f\u52a8\u751f\u6210\u5668\uff1b<\/p>\n<p>\u7136\u540e\uff0c\u4e00\u65e6\u751f\u4ea7\u4e86\u4e1c\u897f\uff0c\u901a\u8fc7c.send(n)\u5207\u6362\u5230consumer\u6267\u884c\uff1b<\/p>\n<p>consumer\u901a\u8fc7yield\u62ff\u5230\u6d88\u606f\uff0c\u5904\u7406\uff0c\u53c8\u901a\u8fc7yield\u628a\u7ed3\u679c\u4f20\u56de\uff1b<\/p>\n<p>produce\u62ff\u5230consumer\u5904\u7406\u7684\u7ed3\u679c\uff0c\u7ee7\u7eed\u751f\u4ea7\u4e0b\u4e00\u6761\u6d88\u606f\uff1b<\/p>\n<p>produce\u51b3\u5b9a\u4e0d\u751f\u4ea7\u4e86\uff0c\u901a\u8fc7c.close()\u5173\u95edconsumer\uff0c\u6574\u4e2a\u8fc7\u7a0b\u7ed3\u675f\u3002<\/p>\n<p>\u6574\u4e2a\u6d41\u7a0b\u65e0\u9501\uff0c\u7531\u4e00\u4e2a\u7ebf\u7a0b\u6267\u884c\uff0cproduce\u548cconsumer\u534f\u4f5c\u5b8c\u6210\u4efb\u52a1\uff0c\u6240\u4ee5\u79f0\u4e3a\u201c\u534f\u7a0b\u201d\uff0c\u800c\u975e\u7ebf\u7a0b\u7684\u62a2\u5360\u5f0f\u591a\u4efb\u52a1\u3002<br \/>\n<strong>\u4e09\u3001async\u5173\u952e\u5b57<\/strong><\/p>\n<p><strong>1\uff09\u8868\u660e\u7a0b\u5e8f\u91cc\u9762\u53ef\u80fd\u6709\u5f02\u6b65\u8fc7\u7a0b\uff1a<\/strong>\u00a0async\u5173\u952e\u5b57\u8868\u660e\u7a0b\u5e8f\u91cc\u9762\u53ef\u80fd\u6709\u5f02\u6b65\u8fc7\u7a0b\uff0c\u91cc\u9762\u53ef\u4ee5\u6709await\u5173\u952e\u5b57\uff1b\u5f53\u7136\u5168\u90e8\u662f\u540c\u6b65\u4ee3\u7801\u4e5f\u6ca1\u5173\u7cfb\uff0c\u4f46\u662f\u8fd9\u6837async\u5173\u952e\u5b57\u5c31\u663e\u5f97\u591a\u4f59\u4e86\uff1b<\/p>\n<p><strong>2\uff09\u975e\u963b\u585e\uff1a<\/strong>\u00a0async\u51fd\u6570\u91cc\u9762\u5982\u679c\u6709\u5f02\u6b65\u8fc7\u7a0b\u4f1a\u7b49\u5f85\uff0c\u4f46\u662fasync\u51fd\u6570\u672c\u8eab\u4f1a\u9a6c\u4e0a\u8fd4\u56de\uff0c\u4e0d\u4f1a\u963b\u585e\u5f53\u524d\u7ebf\u7a0b\uff0c\u53ef\u4ee5\u7b80\u5355\u8ba4\u4e3a\uff0casync\u51fd\u6570\u5de5\u4f5c\u5728\u4e3b\u7ebf\u7a0b\uff0c\u540c\u6b65\u6267\u884c\uff0c\u4e0d\u4f1a\u963b\u585e\u754c\u9762\u6e32\u67d3\uff0casync\u51fd\u6570\u5185\u90e8\u7531await\u5173\u952e\u5b57\u4fee\u9970\u7684\u5f02\u6b65\u8fc7\u7a0b\uff0c\u5de5\u4f5c\u5728\u76f8\u5e94\u7684\u534f\u7a0b\u4e0a\uff0c\u4f1a\u963b\u585e\u7b49\u5f85\u5f02\u6b65\u4efb\u52a1\u7684\u5b8c\u6210\u518d\u8fd4\u56de\uff1b<\/p>\n<p><strong>3\uff09async\u51fd\u6570\u8fd4\u56de\u7c7b\u578b\u4e3aPromise\u5bf9\u8c61\uff1a<\/strong>\u00a0\u8fd9\u662f\u548c\u666e\u901a\u51fd\u6570\u672c\u8d28\u4e0a\u4e0d\u540c\u7684\u5730\u65b9\uff0c\u4e5f\u662f\u4f7f\u7528\u65f6\u91cd\u70b9\u6ce8\u610f\u7684\u5730\u65b9\uff1b<br \/>\n\uff081\uff09return newPromise();\u8fd9\u4e2a\u7b26\u5408async\u51fd\u6570\u672c\u610f\uff1b<br \/>\n\uff082\uff09return data;\u8fd9\u4e2a\u662f\u540c\u6b65\u51fd\u6570\u7684\u5199\u6cd5\uff0c\u8fd9\u91cc\u662f\u8981\u7279\u522b\u6ce8\u610f\u7684\uff0c\u8fd9\u4e2a\u65f6\u5019\uff0c\u5176\u5b9e\u5c31\u76f8\u5f53\u4e8ePromise.resolve(data);\u8fd8\u662f\u4e00\u4e2aPromise\u5bf9\u8c61\uff0c\u4f46\u662f\u5728\u8c03\u7528async\u51fd\u6570\u7684\u5730\u65b9\u901a\u8fc7\u7b80\u5355\u7684=\u662f\u62ff\u4e0d\u5230\u8fd9\u4e2adata\u7684\uff0c\u56e0\u4e3a\u8fd4\u56de\u503c\u662f\u4e00\u4e2aPromise\u5bf9\u8c61\uff0c\u6240\u4ee5\u9700\u8981\u7528.then(data =&gt; { })\u51fd\u6570\u624d\u53ef\u4ee5\u62ff\u5230\u8fd9\u4e2adata\uff1b<br \/>\n\uff083\uff09\u5982\u679c\u6ca1\u6709\u8fd4\u56de\u503c\uff0c\u76f8\u5f53\u4e8e\u8fd4\u56de\u4e86Promise.resolve(undefined);<\/p>\n<p><strong>4\uff09\u65e0\u7b49\u5f85<\/strong>\u00a0\u8054\u60f3\u5230Promise\u7684\u7279\u70b9\uff0c\u5728\u6ca1\u6709await\u7684\u60c5\u51b5\u4e0b\u6267\u884casync\u51fd\u6570\uff0c\u5b83\u4f1a\u7acb\u5373\u6267\u884c\uff0c\u8fd4\u56de\u4e00\u4e2aPromise\u5bf9\u8c61\uff0c\u5e76\u4e14\u7edd\u5bf9\u4e0d\u4f1a\u963b\u585e\u540e\u9762\u7684\u8bed\u53e5\uff0c\u8fd9\u548c\u666e\u901a\u8fd4\u56dePromise\u5bf9\u8c61\u7684\u51fd\u6570\u5e76\u65e0\u4e8c\u81f4\uff1b<\/p>\n<p><strong>5\uff09await\u4e0d\u5904\u7406\u5f02\u6b65error\uff1a<\/strong>\u00a0await\u662f\u4e0d\u7ba1\u5f02\u6b65\u8fc7\u7a0b\u7684reject(error)\u6d88\u606f\u7684\uff0casync\u51fd\u6570\u8fd4\u56de\u7684\u8fd9\u4e2aPromise\u5bf9\u8c61\u7684catch\u51fd\u6570\u8d1f\u8d23\u7edf\u4e00\u6293\u53d6\u5185\u90e8\u6240\u6709\u5f02\u6b65\u8fc7\u7a0b\u7684\u9519\u8bef\uff1basync\u51fd\u6570\u5185\u90e8\u53ea\u8981\u6709\u4e00\u4e2a\u5f02\u6b65\u8fc7\u7a0b\u53d1\u751f\u9519\u8bef\uff0c\u6574\u4e2a\u6267\u884c\u8fc7\u7a0b\u5c31\u4e2d\u65ad\uff0c\u8fd9\u4e2a\u8fd4\u56de\u7684Promise\u5bf9\u8c61\u7684catch\u5c31\u80fd\u6293\u53d6\u5230\u8fd9\u4e2a\u9519\u8bef\uff1b<\/p>\n<p><strong>5\uff09async\u51fd\u6570\u7684\u6267\u884c\uff1a<\/strong>\u00a0async\u51fd\u6570\u6267\u884c\u548c\u666e\u901a\u51fd\u6570\u4e00\u6837\uff0c\u51fd\u6570\u540d\u5e26\u4e2a()\u5c31\u53ef\u4ee5\u4e86\uff0c\u53c2\u6570\u4e2a\u6570\u968f\u610f\uff0c\u6ca1\u6709\u9650\u5236\uff0c\u4e5f\u9700\u8981\u6709async\u5173\u952e\u5b57\uff1b\u53ea\u662f\u8fd4\u56de\u503c\u662f\u4e00\u4e2aPromise\u5bf9\u8c61\uff0c\u53ef\u4ee5\u7528then\u51fd\u6570\u5f97\u5230\u8fd4\u56de\u503c\uff0c\u7528catch\u6293\u6574\u4e2a\u6d41\u7a0b\u4e2d\u53d1\u751f\u7684\u9519\u8bef\uff1b<\/p>\n<div class=\"_2Uzcx_\"><button class=\"VJbwyy\" type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><i class=\"anticon anticon-copy\" aria-label=\"icon: copy\"><\/i><\/button><\/p>\n<pre class=\"line-numbers  language-jsx\"><code class=\"  language-jsx\"><span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">testAsync<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token keyword\">return<\/span> <span class=\"token string\">\"hello async\"<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token keyword\">const<\/span> result <span class=\"token operator\">=<\/span> <span class=\"token function\">testAsync<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8fd4\u56de\u4e00\u4e2aPromise\u5bf9\u8c61<\/span>\r\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token comment\">\/\/ async\u51fd\u6570\u8fd4\u56de\u7684\u662f\u4e00\u4e2aPromise\u5bf9\u8c61\uff0casync\u51fd\u6570\uff08\u5305\u62ec\u51fd\u6570\u8bed\u53e5\u3001\u51fd\u6570\u8868\u8fbe\u5f0f\u3001Lambda\u8868\u8fbe\u5f0f\uff09\u4f1a\u8fd4\u56de\u4e00\u4e2aPromise\u5bf9\u8c61\uff0c\u5982\u679c\u5728\u51fd\u6570\u4e2dreturn\u4e00\u4e2a\u76f4\u63a5\u91cf\uff0casync\u4f1a\u628a\u8fd9\u4e2a\u76f4\u63a5\u91cf\u901a\u8fc7Promise.resolve() \u5c01\u88c5\u6210 Promise \u5bf9\u8c61\uff1b<\/span>\r\n<\/code><\/pre>\n<\/div>\n<div class=\"_2Uzcx_\"><button class=\"VJbwyy\" type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><i class=\"anticon anticon-copy\" aria-label=\"icon: copy\"><\/i><\/button><\/p>\n<pre class=\"line-numbers  language-jsx\"><code class=\"  language-jsx\"><span class=\"token comment\">\/\/ async\u51fd\u6570\u8fd4\u56de\u7684\u662f\u4e00\u4e2aPromise\u5bf9\u8c61\uff0c\u6240\u4ee5\u5728\u6700\u5916\u5c42\u4e0d\u80fd\u7528await\u83b7\u53d6\u5176\u8fd4\u56de\u503c\u7684\u60c5\u51b5\uff0c\u5e94\u8be5\u4f7f\u7528\u539f\u59cb\u7684\u65b9\u5f0f\uff1athen()\u94fe\u6765\u5904\u7406\u8fd9\u4e2aPromise\u5bf9\u8c61<\/span>\r\n<span class=\"token function\">testAsync<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">v<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token punctuation\">{<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>v<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ \u8f93\u51fa hello async<\/span>\r\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/code><\/pre>\n<\/div>\n<p><strong>\u56db\u3001await\u5173\u952e\u5b57<\/strong><\/p>\n<p><strong>1\uff09await\u53ea\u80fd\u5728async\u51fd\u6570\u5185\u90e8\u4f7f\u7528\uff1a<\/strong>\u4e0d\u80fd\u653e\u5728\u666e\u901a\u51fd\u6570\u91cc\u9762\uff0c\u5426\u5219\u4f1a\u62a5\u9519\uff1b<\/p>\n<p><strong>2\uff09await\u5173\u952e\u5b57\u540e\u9762\u8ddfPromise\u5bf9\u8c61\uff1a<\/strong>\u5728Pending\u72b6\u6001\u65f6\uff0c\u76f8\u5e94\u7684\u534f\u7a0b\u4f1a\u4ea4\u51fa\u63a7\u5236\u6743\uff0c\u8fdb\u5165\u7b49\u5f85\u72b6\u6001\uff0c\u8fd9\u662f\u534f\u7a0b\u7684\u672c\u8d28\uff1b<\/p>\n<p><strong>3\uff09await\u662fasync wait\u7684\u610f\u601d\uff1a<\/strong>\u00a0wait\u7684\u662fresolve(data)\u7684\u6d88\u606f\uff0c\u5e76\u628a\u6570\u636edata\u8fd4\u56de\uff0c\u6bd4\u5982\u4e0b\u9762\u4ee3\u7801\u4e2d\uff0c\u5f53Promise\u5bf9\u8c61\u7531Pending\u53d8\u4e3aResolved\u7684\u65f6\u5019\uff0c\u53d8\u91cfa\u5c31\u7b49\u4e8edata\uff0c\u7136\u540e\u518d\u987a\u5e8f\u6267\u884c\u4e0b\u9762\u7684\u8bed\u53e5console.log(a)\uff0c\u8fd9\u771f\u7684\u662f\u7b49\u5f85\uff0c\u771f\u7684\u662f\u987a\u5e8f\u6267\u884c\uff0c\u8868\u73b0\u548c\u540c\u6b65\u4ee3\u7801\u51e0\u4e4e\u4e00\u6a21\u4e00\u6837\uff1b<\/p>\n<div class=\"_2Uzcx_\"><button class=\"VJbwyy\" type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><i class=\"anticon anticon-copy\" aria-label=\"icon: copy\"><\/i><\/button><\/p>\n<pre class=\"line-numbers  language-jsx\"><code class=\"  language-jsx\"><span class=\"token keyword\">const<\/span> a <span class=\"token operator\">=<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Promise<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">resolve<span class=\"token punctuation\">,<\/span> reject<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token comment\">\/\/ async process ...<\/span>\r\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">resolve<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/code><\/pre>\n<\/div>\n<p><strong>4\uff09await\u540e\u9762\u4e5f\u53ef\u4ee5\u8ddf\u540c\u6b65\u4ee3\u7801\uff1a<\/strong>\u00a0\u4e0d\u8fc7\u7cfb\u7edf\u4f1a\u81ea\u52a8\u5c06\u5176\u8f6c\u5316\u6210\u4e00\u4e2aPromsie\u5bf9\u8c61\uff0c\u6bd4\u5982\uff1a<\/p>\n<div class=\"_2Uzcx_\"><button class=\"VJbwyy\" type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><i class=\"anticon anticon-copy\" aria-label=\"icon: copy\"><\/i><\/button><\/p>\n<pre class=\"line-numbers  language-jsx\"><code class=\"  language-jsx\"><span class=\"token keyword\">const<\/span> a <span class=\"token operator\">=<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token string\">'hello world'<\/span>\r\n\r\n<span class=\"token comment\">\/\/ \u76f8\u5f53\u4e8e<\/span>\r\n<span class=\"token keyword\">const<\/span> a <span class=\"token operator\">=<\/span> <span class=\"token keyword\">await<\/span> Promise<span class=\"token punctuation\">.<\/span><span class=\"token function\">resolve<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'hello world'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token comment\">\/\/ \u8ddf\u540c\u6b65\u4ee3\u7801\u662f\u4e00\u6837\u7684\uff0c\u8fd8\u4e0d\u5982\u7701\u4e8b\u70b9\uff0c\u76f4\u63a5\u53bb\u6389await\u5173\u952e\u5b57<\/span>\r\n<span class=\"token keyword\">const<\/span> a <span class=\"token operator\">=<\/span> <span class=\"token string\">'hello world'<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/code><\/pre>\n<\/div>\n<p><strong>5\uff09await\u5bf9\u4e8e\u5931\u8d25\u6d88\u606f\u7684\u5904\u7406\uff1a<\/strong>\u00a0await\u53ea\u5173\u5fc3\u5f02\u6b65\u8fc7\u7a0b\u6210\u529f\u7684\u6d88\u606fresolve(data)\uff0c\u62ff\u5230\u76f8\u5e94\u7684\u6570\u636edata\uff0c\u81f3\u4e8e\u5931\u8d25\u6d88\u606freject(error)\uff0c\u4e0d\u5173\u5fc3\u4e0d\u5904\u7406\uff1b\u5bf9\u4e8e\u9519\u8bef\u7684\u5904\u7406\u6709\u4ee5\u4e0b\u51e0\u79cd\u65b9\u6cd5\u4f9b\u9009\u62e9\uff1a<br \/>\n\uff081\uff09\u8ba9await\u540e\u9762\u7684Promise\u5bf9\u8c61\u81ea\u5df1catch\uff1b<br \/>\n\uff082\uff09\u4e5f\u53ef\u4ee5\u8ba9\u5916\u9762\u7684async\u51fd\u6570\u8fd4\u56de\u7684Promise\u5bf9\u8c61\u7edf\u4e00catch\uff1b<br \/>\n\uff083\uff09\u50cf\u540c\u6b65\u4ee3\u7801\u4e00\u6837\uff0c\u653e\u5728\u4e00\u4e2atry&#8230;catch\u7ed3\u6784\u4e2d\uff1b<\/p>\n<div class=\"_2Uzcx_\"><button class=\"VJbwyy\" type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><i class=\"anticon anticon-copy\" aria-label=\"icon: copy\"><\/i><\/button><\/p>\n<pre class=\"line-numbers  language-csharp\"><code class=\"  language-csharp\"><span class=\"token keyword\">async<\/span> <span class=\"token function\">componentDidMount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/\/ \u8fd9\u662fReact Native\u7684\u56de\u8c03\u51fd\u6570\uff0c\u52a0\u4e2aasync\u5173\u952e\u5b57\uff0c\u6ca1\u6709\u4efb\u4f55\u5f71\u54cd\uff0c\u4f46\u662f\u53ef\u4ee5\u7528await\u5173\u952e\u5b57<\/span>\r\n    <span class=\"token comment\">\/\/ \u5c06\u5f02\u6b65\u548c\u540c\u6b65\u7684\u4ee3\u7801\u653e\u5728\u4e00\u4e2atry..catch\u4e2d\uff0c\u5f02\u5e38\u90fd\u80fd\u6293\u5230<\/span>\r\n    <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token keyword\">let<\/span> array <span class=\"token operator\">=<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token keyword\">let<\/span> data <span class=\"token operator\">=<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">asyncFunction<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8fd9\u91cc\u7528await\u5173\u952e\u5b57\uff0c\u5c31\u80fd\u62ff\u5230\u7ed3\u679c\u503c\uff1b\u5426\u5219\uff0c\u6ca1\u6709await\u7684\u8bdd\uff0c\u53ea\u80fd\u62ff\u5230Promise\u5bf9\u8c61<\/span>\r\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>array<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>  <span class=\"token comment\">\/\/ \u8fd9\u91cc\u4f1a\u629b\u51fa\u5f02\u5e38\uff0c\u4e0b\u9762\u7684catch\u4e5f\u80fd\u6293\u5230<\/span>\r\n            array<span class=\"token punctuation\">.<\/span><span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span>\r\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span>error<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token function\">alert<\/span><span class=\"token punctuation\">(<\/span>JSON<span class=\"token punctuation\">.<\/span><span class=\"token function\">stringify<\/span><span class=\"token punctuation\">(<\/span>error<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n    <span class=\"token punctuation\">}<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n\r\n<\/code><\/pre>\n<\/div>\n<p><strong>6\uff09await\u5bf9\u4e8e\u7ed3\u679c\u7684\u5904\u7406\uff1a<\/strong>\u00a0await\u662f\u4e2a\u8fd0\u7b97\u7b26\uff0c\u7528\u4e8e\u7ec4\u6210\u8868\u8fbe\u5f0f\uff0cawait\u8868\u8fbe\u5f0f\u7684\u8fd0\u7b97\u7ed3\u679c\u53d6\u51b3\u4e8e\u5b83\u7b49\u7684\u4e1c\u897f\uff0c\u5982\u679c\u5b83\u7b49\u5230\u7684\u4e0d\u662f\u4e00\u4e2aPromise\u5bf9\u8c61\uff0c\u90a3\u4e48await\u8868\u8fbe\u5f0f\u7684\u8fd0\u7b97\u7ed3\u679c\u5c31\u662f\u5b83\u7b49\u5230\u7684\u4e1c\u897f\uff1b\u5982\u679c\u5b83\u7b49\u5230\u7684\u662f\u4e00\u4e2aPromise\u5bf9\u8c61\uff0cawait\u5c31\u5fd9\u8d77\u6765\u4e86\uff0c\u5b83\u4f1a\u963b\u585e\u5176\u540e\u9762\u7684\u4ee3\u7801\uff0c\u7b49\u7740Promise\u5bf9\u8c61resolve\uff0c\u7136\u540e\u5f97\u5230resolve\u7684\u503c\uff0c\u4f5c\u4e3aawait\u8868\u8fbe\u5f0f\u7684\u8fd0\u7b97\u7ed3\u679c\uff1b\u867d\u7136\u662f\u963b\u585e\uff0c\u4f46async\u51fd\u6570\u8c03\u7528\u5e76\u4e0d\u4f1a\u9020\u6210\u963b\u585e\uff0c\u5b83\u5185\u90e8\u6240\u6709\u7684\u963b\u585e\u90fd\u88ab\u5c01\u88c5\u5728\u4e00\u4e2aPromise\u5bf9\u8c61\u4e2d\u5f02\u6b65\u6267\u884c\uff0c\u8fd9\u4e5f\u6b63\u662fawait\u5fc5\u987b\u7528\u5728async\u51fd\u6570\u4e2d\u7684\u539f\u56e0\uff1b<\/p>\n<p><strong>\u4e94\u3001\u5957\u8def\u5206\u6790\u4e00<\/strong><\/p>\n<div class=\"_2Uzcx_\"><button class=\"VJbwyy\" type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><i class=\"anticon anticon-copy\" aria-label=\"icon: copy\"><\/i><\/button><\/p>\n<pre class=\"line-numbers  language-jsx\"><code class=\"  language-jsx\"><span class=\"token comment\">\/\/ \u5f02\u6b65\u8fc7\u7a0b\u5c01\u88c5<\/span>\r\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">ms<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Promise<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">resolve<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token function\">setTimeout<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token punctuation\">{<\/span>\r\n            <span class=\"token function\">resolve<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'sleep for '<\/span> <span class=\"token operator\">+<\/span> ms <span class=\"token operator\">+<\/span> <span class=\"token string\">' ms'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> ms<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<\/div>\n<div class=\"_2Uzcx_\"><button class=\"VJbwyy\" type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><i class=\"anticon anticon-copy\" aria-label=\"icon: copy\"><\/i><\/button><\/p>\n<pre class=\"line-numbers  language-jsx\"><code class=\"  language-jsx\"><span class=\"token comment\">\/\/ \u5b9a\u4e49\u5f02\u6b65\u6d41\u7a0b\uff0c\u53ef\u4ee5\u5c06\u6309\u7167\u9700\u8981\u5b9a\u5236\uff0c\u5c31\u50cf\u5199\u540c\u6b65\u4ee3\u7801\u90a3\u6837<\/span>\r\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">asyncFunction<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">time<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'asyncFunction total executing:'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">const<\/span> sleep1 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'sleep1: '<\/span> <span class=\"token operator\">+<\/span> sleep1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">[<\/span>sleep2<span class=\"token punctuation\">,<\/span> sleep3<span class=\"token punctuation\">,<\/span> sleep4<span class=\"token punctuation\">]<\/span><span class=\"token operator\">=<\/span> <span class=\"token keyword\">await<\/span> Promise<span class=\"token punctuation\">.<\/span><span class=\"token function\">all<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1500<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'sleep2: '<\/span> <span class=\"token operator\">+<\/span> sleep2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'sleep3: '<\/span> <span class=\"token operator\">+<\/span> sleep3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'sleep4: '<\/span> <span class=\"token operator\">+<\/span> sleep4<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">const<\/span> sleepRace <span class=\"token operator\">=<\/span> <span class=\"token keyword\">await<\/span> Promise<span class=\"token punctuation\">.<\/span><span class=\"token function\">race<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">[<\/span><span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1000<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'sleep race: '<\/span> <span class=\"token operator\">+<\/span> sleepRace<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">timeEnd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'asyncFunction total executing:'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    \r\n    <span class=\"token keyword\">return<\/span> <span class=\"token string\">'asyncFunction done.'<\/span>  <span class=\"token comment\">\/\/ \u8fd9\u4e2a\u53ef\u4ee5\u4e0d\u8fd4\u56de\uff0c\u8fd9\u91cc\u53ea\u662f\u505a\u4e2a\u6807\u8bb0\uff0c\u4e3a\u4e86\u663e\u793a\u6d41\u7a0b<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<\/div>\n<div class=\"_2Uzcx_\"><button class=\"VJbwyy\" type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><i class=\"anticon anticon-copy\" aria-label=\"icon: copy\"><\/i><\/button><\/p>\n<pre class=\"line-numbers  language-jsx\"><code class=\"  language-jsx\"><span class=\"token comment\">\/\/ \u50cf\u666e\u901a\u51fd\u6570\u8c03\u7528async\u51fd\u6570\uff0c\u5728then\u51fd\u6570\u4e2d\u83b7\u53d6\u6574\u4e2a\u6d41\u7a0b\u7684\u8fd4\u56de\u4fe1\u606f\uff0c\u5728catch\u51fd\u6570\u7edf\u4e00\u5904\u7406\u51fa\u9519\u4fe1\u606f<\/span>\r\n<span class=\"token function\">asyncFunction<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">data<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token punctuation\">{<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ asyncFunction return \u7684\u5185\u5bb9\u5728\u8fd9\u91cc\u83b7\u53d6<\/span>\r\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">catch<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">error<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token punctuation\">{<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span>error<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ asyncFunction \u7684\u9519\u8bef\u7edf\u4e00\u5728\u8fd9\u91cc\u6293\u53d6<\/span>\r\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\nconsole<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">'after asyncFunction code executing....'<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8fd9\u4e2a\u4ee3\u8868asyncFunction\u51fd\u6570\u540e\u7684\u4ee3\u7801\uff0c<\/span>\r\n                                                       <span class=\"token comment\">\/\/ \u663e\u793aasyncFunction\u672c\u8eab\u4f1a\u7acb\u5373\u8fd4\u56de\uff0c\u4e0d\u4f1a\u963b\u585e\u4e3b\u7ebf\u7a0b<\/span>\r\n\r\n<\/code><\/pre>\n<\/div>\n<div class=\"_2Uzcx_\"><button class=\"VJbwyy\" type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><i class=\"anticon anticon-copy\" aria-label=\"icon: copy\"><\/i><\/button><\/p>\n<pre class=\"line-numbers  language-cpp\"><code class=\"  language-cpp\"><span class=\"token comment\">\/\/ \u6267\u884c\u7ed3\u679c<\/span>\r\nafter asyncFunction code executing<span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span>\r\nsleep1<span class=\"token operator\">:<\/span> sleep <span class=\"token keyword\">for<\/span> <span class=\"token number\">2000<\/span> ms\r\nsleep2<span class=\"token operator\">:<\/span> sleep <span class=\"token keyword\">for<\/span> <span class=\"token number\">2000<\/span> ms\r\nsleep3<span class=\"token operator\">:<\/span> sleep <span class=\"token keyword\">for<\/span> <span class=\"token number\">1000<\/span> ms\r\nsleep4<span class=\"token operator\">:<\/span> sleep <span class=\"token keyword\">for<\/span> <span class=\"token number\">1500<\/span> ms\r\nsleep race<span class=\"token operator\">:<\/span> sleep <span class=\"token keyword\">for<\/span> <span class=\"token number\">1000<\/span> ms\r\nasyncFunction total executing<span class=\"token operator\">::<\/span> <span class=\"token number\">5006.276123046875<\/span>ms\r\nasyncFunction done<span class=\"token punctuation\">.<\/span>\r\n<\/code><\/pre>\n<\/div>\n<p><strong>\u4ee3\u7801\u5206\u6790<\/strong><\/p>\n<ul>\n<li>after asyncFunction code executing&#8230;.\u4ee3\u7801\u4f4d\u7f6e\u5728async\u51fd\u6570asyncFunction()\u8c03\u7528\u4e4b\u540e\uff0c\u53cd\u800c\u5148\u8f93\u51fa\uff0c\u8fd9\u8bf4\u660easync\u51fd\u6570asyncFunction()\u8c03\u7528\u4e4b\u540e\u4f1a\u9a6c\u4e0a\u8fd4\u56de\uff0c\u4e0d\u4f1a\u963b\u585e\u4e3b\u7ebf\u7a0b\uff1b<\/li>\n<li>sleep1: sleep for 2000 ms\u8fd9\u662f\u7b2c\u4e00\u4e2aawait\u4e4b\u540e\u7684\u7b2c\u4e00\u4e2a\u5f02\u6b65\u8fc7\u7a0b\uff0c\u6700\u5148\u6267\u884c\uff0c\u4e5f\u6700\u5148\u5b8c\u6210\uff0c\u8bf4\u660e\u540e\u9762\u7684\u4ee3\u7801\uff0c\u4e0d\u8bba\u662f\u540c\u6b65\u548c\u5f02\u6b65\uff0c\u90fd\u5728\u7b49\u4ed6\u6267\u884c\u5b8c\u6bd5\uff1b<\/li>\n<li>sleep2 ~ sleep4\u8fd9\u662f\u7b2c\u4e8c\u4e2aawait\u4e4b\u540e\u7684Promise.all()\u5f02\u6b65\u8fc7\u7a0b\uff0c\u8fd9\u662f\u201c\u6bd4\u6162\u6a21\u5f0f\u201d\uff0c\u4e09\u4e2asleep\u90fd\u5b8c\u6210\u540e\uff0c\u518d\u8fd0\u884c\u4e0b\u9762\u7684\u4ee3\u7801\uff0c\u8017\u65f6\u6700\u957f\u7684\u662f2000ms\uff1b<\/li>\n<li>sleep race: sleep for 1000 ms\u8fd9\u662f\u7b2c\u4e09\u4e2aawait\u4e4b\u540e\u7684Promise.race()\u5f02\u6b65\u8fc7\u7a0b\uff0c\u8fd9\u662f\u201c\u6bd4\u5feb\u6a21\u5f0f\u201d\uff0c\u8017\u65f6\u6700\u77edsleep\u90fd\u5b8c\u6210\u540e\uff0c\u5c31\u8fd0\u884c\u4e0b\u9762\u7684\u4ee3\u7801\uff0c\u8017\u65f6\u6700\u77ed\u7684\u662f1000ms\uff1b<\/li>\n<li>asyncFunction total executing:: 5006.276123046875ms\u8fd9\u662f\u6700\u540e\u7684\u7edf\u8ba1\u603b\u5171\u8fd0\u884c\u65f6\u95f4\u4ee3\u7801\uff0c\u4e09\u4e2aawait\u4e4b\u540e\u7684\u5f02\u6b65\u8fc7\u7a0b\u4e4b\u548c\uff1a<br \/>\n1000\uff08\u72ec\u7acb\u7684\uff09 + 2000\uff08Promise.all\uff09 + 1000\uff08Promise.race\uff09 = 5000ms<br \/>\n\u8fd9\u4e2a\u548c\u7edf\u8ba1\u51fa\u6765\u76845006.276123046875ms\u975e\u5e38\u63a5\u8fd1\uff0c\u8bf4\u660e\u4e0a\u9762\u7684\u5f02\u6b65\u8fc7\u7a0b\uff0c\u548c\u540c\u6b65\u4ee3\u7801\u6267\u884c\u8fc7\u7a0b\u4e00\u81f4\uff0c\u534f\u7a0b\u771f\u7684\u662f\u5728\u7b49\u5f85\u5f02\u6b65\u8fc7\u7a0b\u6267\u884c\u5b8c\u6bd5\uff1b<\/li>\n<li>asyncFunction done.\u8fd9\u4e2a\u662fasync\u51fd\u6570\u8fd4\u56de\u7684\u4fe1\u606f\uff0c\u5728\u6267\u884c\u65f6\u7684then\u51fd\u6570\u4e2d\u83b7\u5f97\uff0c\u8bf4\u660e\u6574\u4e2a\u6d41\u7a0b\u5b8c\u6bd5\u4e4b\u540e\u53c2\u6570\u4f20\u9012\u7684\u8fc7\u7a0b\uff1b<\/li>\n<\/ul>\n<p><strong>\u516d\u3001\u5957\u8def\u5206\u6790\u4e8c<\/strong><\/p>\n<div class=\"_2Uzcx_\"><button class=\"VJbwyy\" type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><i class=\"anticon anticon-copy\" aria-label=\"icon: copy\"><\/i><\/button><\/p>\n<pre class=\"line-numbers  language-jsx\"><code class=\"  language-jsx\"><span class=\"token comment\">\/**\r\n * \u4f20\u5165\u53c2\u6570 n\uff0c\u8868\u793a\u8fd9\u4e2a\u51fd\u6570\u6267\u884c\u7684\u65f6\u95f4\uff08\u6beb\u79d2\uff09\r\n * \u6267\u884c\u7684\u7ed3\u679c\u662f n + 200\uff0c\u8fd9\u4e2a\u503c\u5c06\u7528\u4e8e\u4e0b\u4e00\u6b65\u9aa4\r\n *\/<\/span>\r\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">takeLongTime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">n<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Promise<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">resolve<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token punctuation\">{<\/span>\r\n        <span class=\"token function\">setTimeout<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token function\">resolve<\/span><span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">+<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">step1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">n<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">`<\/span><span class=\"token string\">step1 with <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>n<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">`<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">takeLongTime<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">step2<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">n<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">`<\/span><span class=\"token string\">step2 with <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>n<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">`<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">takeLongTime<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">step3<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">n<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">`<\/span><span class=\"token string\">step3 with <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>n<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">`<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">takeLongTime<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<\/div>\n<div class=\"_2Uzcx_\"><button class=\"VJbwyy\" type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><i class=\"anticon anticon-copy\" aria-label=\"icon: copy\"><\/i><\/button><\/p>\n<pre class=\"line-numbers  language-jsx\"><code class=\"  language-jsx\"><span class=\"token comment\">\/\/ Promise\u65b9\u5f0f\u8c03\u7528<\/span>\r\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">doIt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">time<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"doIt\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">const<\/span> time1 <span class=\"token operator\">=<\/span> <span class=\"token number\">300<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token function\">step1<\/span><span class=\"token punctuation\">(<\/span>time1<span class=\"token punctuation\">)<\/span>\r\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">time2<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token function\">step2<\/span><span class=\"token punctuation\">(<\/span>time2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">time3<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token function\">step3<\/span><span class=\"token punctuation\">(<\/span>time3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span>\r\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">result<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token punctuation\">{<\/span>\r\n            console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">`<\/span><span class=\"token string\">result is <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>result<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">`<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n            console<span class=\"token punctuation\">.<\/span><span class=\"token function\">timeEnd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"doIt\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token function\">doIt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token comment\">\/\/ c:\\var\\test&gt;node --harmony_async_await .<\/span>\r\n<span class=\"token comment\">\/\/ step1 with 300<\/span>\r\n<span class=\"token comment\">\/\/ step2 with 500<\/span>\r\n<span class=\"token comment\">\/\/ step3 with 700<\/span>\r\n<span class=\"token comment\">\/\/ result is 900<\/span>\r\n<span class=\"token comment\">\/\/ doIt: 1507.251ms<\/span>\r\n<\/code><\/pre>\n<\/div>\n<div class=\"_2Uzcx_\"><button class=\"VJbwyy\" type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><i class=\"anticon anticon-copy\" aria-label=\"icon: copy\"><\/i><\/button><\/p>\n<pre class=\"line-numbers  language-jsx\"><code class=\"  language-jsx\"><span class=\"token comment\">\/\/ async\/await\u65b9\u5f0f\u8c03\u7528<\/span>\r\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">doIt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">time<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"doIt\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">const<\/span> time1 <span class=\"token operator\">=<\/span> <span class=\"token number\">300<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">const<\/span> time2 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">step1<\/span><span class=\"token punctuation\">(<\/span>time1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">const<\/span> time3 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">step2<\/span><span class=\"token punctuation\">(<\/span>time2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">const<\/span> result <span class=\"token operator\">=<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">step3<\/span><span class=\"token punctuation\">(<\/span>time3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">`<\/span><span class=\"token string\">result is <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>result<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">`<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">timeEnd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"doIt\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token function\">doIt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/code><\/pre>\n<\/div>\n<p><strong>\u4e03\u3001\u5957\u8def\u5206\u6790\u4e09<\/strong><\/p>\n<div class=\"_2Uzcx_\"><button class=\"VJbwyy\" type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><i class=\"anticon anticon-copy\" aria-label=\"icon: copy\"><\/i><\/button><\/p>\n<pre class=\"line-numbers  language-jsx\"><code class=\"  language-jsx\"><span class=\"token keyword\">function<\/span> <span class=\"token function\">step1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">n<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">`<\/span><span class=\"token string\">step1 with <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>n<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">`<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">takeLongTime<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">step2<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">m<span class=\"token punctuation\">,<\/span> n<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">`<\/span><span class=\"token string\">step2 with <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>m<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\"> and <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>n<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">`<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">takeLongTime<\/span><span class=\"token punctuation\">(<\/span>m <span class=\"token operator\">+<\/span> n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">step3<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">k<span class=\"token punctuation\">,<\/span> m<span class=\"token punctuation\">,<\/span> n<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">`<\/span><span class=\"token string\">step3 with <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>k<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\">, <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>m<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token string\"> and <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>n<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">`<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">takeLongTime<\/span><span class=\"token punctuation\">(<\/span>k <span class=\"token operator\">+<\/span> m <span class=\"token operator\">+<\/span> n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n<\/code><\/pre>\n<\/div>\n<div class=\"_2Uzcx_\"><button class=\"VJbwyy\" type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><i class=\"anticon anticon-copy\" aria-label=\"icon: copy\"><\/i><\/button><\/p>\n<pre class=\"line-numbers  language-jsx\"><code class=\"  language-jsx\"><span class=\"token comment\">\/\/ Promise\u65b9\u5f0f\u8c03\u7528<\/span>\r\n<span class=\"token keyword\">function<\/span> <span class=\"token function\">doIt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">time<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"doIt\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">const<\/span> time1 <span class=\"token operator\">=<\/span> <span class=\"token number\">300<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token function\">step1<\/span><span class=\"token punctuation\">(<\/span>time1<span class=\"token punctuation\">)<\/span>\r\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">time2<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token punctuation\">{<\/span>\r\n            <span class=\"token keyword\">return<\/span> <span class=\"token function\">step2<\/span><span class=\"token punctuation\">(<\/span>time1<span class=\"token punctuation\">,<\/span> time2<span class=\"token punctuation\">)<\/span>\r\n                <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">time3<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token punctuation\">[<\/span>time1<span class=\"token punctuation\">,<\/span> time2<span class=\"token punctuation\">,<\/span> time3<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span>\r\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">times<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token punctuation\">{<\/span>\r\n            <span class=\"token keyword\">const<\/span> <span class=\"token punctuation\">[<\/span>time1<span class=\"token punctuation\">,<\/span> time2<span class=\"token punctuation\">,<\/span> time3<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">=<\/span> times<span class=\"token punctuation\">;<\/span>\r\n            <span class=\"token keyword\">return<\/span> <span class=\"token function\">step3<\/span><span class=\"token punctuation\">(<\/span>time1<span class=\"token punctuation\">,<\/span> time2<span class=\"token punctuation\">,<\/span> time3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span>\r\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">then<\/span><span class=\"token punctuation\">(<\/span><span class=\"token parameter\">result<\/span> <span class=\"token operator\">=&gt;<\/span> <span class=\"token punctuation\">{<\/span>\r\n            console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">`<\/span><span class=\"token string\">result is <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>result<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">`<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n            console<span class=\"token punctuation\">.<\/span><span class=\"token function\">timeEnd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"doIt\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token function\">doIt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<\/code><\/pre>\n<\/div>\n<div class=\"_2Uzcx_\"><button class=\"VJbwyy\" type=\"button\" aria-label=\"\u590d\u5236\u4ee3\u7801\"><i class=\"anticon anticon-copy\" aria-label=\"icon: copy\"><\/i><\/button><\/p>\n<pre class=\"line-numbers  language-jsx\"><code class=\"  language-jsx\"><span class=\"token comment\">\/\/ async\/await\u65b9\u5f0f\u8c03\u7528<\/span>\r\n<span class=\"token keyword\">async<\/span> <span class=\"token keyword\">function<\/span> <span class=\"token function\">doIt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">time<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"doIt\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">const<\/span> time1 <span class=\"token operator\">=<\/span> <span class=\"token number\">300<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">const<\/span> time2 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">step1<\/span><span class=\"token punctuation\">(<\/span>time1<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">const<\/span> time3 <span class=\"token operator\">=<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">step2<\/span><span class=\"token punctuation\">(<\/span>time1<span class=\"token punctuation\">,<\/span> time2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    <span class=\"token keyword\">const<\/span> result <span class=\"token operator\">=<\/span> <span class=\"token keyword\">await<\/span> <span class=\"token function\">step3<\/span><span class=\"token punctuation\">(<\/span>time1<span class=\"token punctuation\">,<\/span> time2<span class=\"token punctuation\">,<\/span> time3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">log<\/span><span class=\"token punctuation\">(<\/span><span class=\"token template-string\"><span class=\"token template-punctuation string\">`<\/span><span class=\"token string\">result is <\/span><span class=\"token interpolation\"><span class=\"token interpolation-punctuation punctuation\">${<\/span>result<span class=\"token interpolation-punctuation punctuation\">}<\/span><\/span><span class=\"token template-punctuation string\">`<\/span><\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n    console<span class=\"token punctuation\">.<\/span><span class=\"token function\">timeEnd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">\"doIt\"<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n<span class=\"token punctuation\">}<\/span>\r\n\r\n<span class=\"token function\">doIt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\r\n\r\n<span class=\"token comment\">\/\/ c:\\var\\test&gt;node --harmony_async_await .<\/span>\r\n<span class=\"token comment\">\/\/ step1 with 300<\/span>\r\n<span class=\"token comment\">\/\/ step2 with 800 = 300 + 500<\/span>\r\n<span class=\"token comment\">\/\/ step3 with 1800 = 300 + 500 + 1000<\/span>\r\n<span class=\"token comment\">\/\/ result is 2000<\/span>\r\n<span class=\"token comment\">\/\/ doIt: 2907.387ms<\/span>\r\n<\/code><\/pre>\n<\/div>\n<p>\u53c2\u8003\u94fe\u63a5\uff1a<br \/>\n<a href=\"https:\/\/www.jianshu.com\/p\/ffa5cbe9ab29\" target=\"_blank\" rel=\"noopener\">JavaScript\uff1aasync\/await\u7684\u57fa\u7840\u7528\u6cd5<\/a><br \/>\n<a href=\"https:\/\/segmentfault.com\/a\/1190000007535316\" target=\"_blank\" rel=\"nofollow noopener\">\u7406\u89e3JavaScript\u7684async\/await<\/a><\/p>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>\u539f\u6587\u5730\u5740 \u4e00\u3001async\/await\u7684\u4f18<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[],"tags":[118],"class_list":["post-4989","post","type-post","status-publish","format-standard","hentry","tag-02-"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/4989","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/comments?post=4989"}],"version-history":[{"count":0,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/4989\/revisions"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=4989"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=4989"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=4989"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}