{"id":924,"date":"2022-03-10T21:33:17","date_gmt":"2022-03-10T13:33:17","guid":{"rendered":"http:\/\/www.henrycome.com\/wordpress\/?p=924"},"modified":"2022-03-10T21:33:17","modified_gmt":"2022-03-10T13:33:17","slug":"20220310213313","status":"publish","type":"post","link":"http:\/\/www.henrycome.com\/wordpress\/202203102133\/924","title":{"rendered":"P106-113-\u5f02\u6b65.js"},"content":{"rendered":"<pre><code class=\"language-javascript\">\/*P106-\u5f02\u6b65-setTimeout*\/\n\/\/JS\u7684\u4ee3\u7801\u4e00\u822c\u60c5\u51b5\u4e0b\u662f\u540c\u6b65\u6267\u884c\u7684\uff0c\u6309\u6b63\u5e38\u987a\u5e8f\u4e00\u6b65\u4e00\u6b65\u6267\u884c\uff0c\n\/\/\u7f3a\u70b9\u5c31\u662f\uff0c\u9047\u5230\u9700\u8981\u82b1\u8d39\u65f6\u95f4\u624d\u80fd\u5b8c\u6210\u7684\u4ee3\u7801\uff0c\u4ed6\u4f1a\u6301\u7eed\u7b49\u5f85\uff0c\u5b8c\u6210\u4e4b\u540e\uff0c\u624d\u4f1a\u7ee7\u7eed\u5f80\u4e0b\u6267\u884c\n\/\/\u5f02\u6b65\u5c31\u662f\u628a\u82b1\u8d39\u65f6\u95f4\u592a\u957f\u7684\u4ee3\u7801\u653e\u5230\u53e6\u4e00\u4e2a\u5730\u65b9\u53bb\u6267\u884c\uff0c\u5269\u4e0b\u7684\u4ee3\u7801\u7ee7\u7eed\u6267\u884c\n\/\/\u5f02\u6b65\u7684\u4ee3\u7801\u4f1a\u6267\u884c\u5b8c\u6bd5\u4e4b\u540e\uff0c\u628a\u7ed3\u679c\u8fd4\u56de\u5230\u540c\u6b65\u6267\u884c\u7684\u4ee3\u7801\u4e2d\u6765\n\/\/\u5e38\u89c1\u7684\u5f02\u6b65\u7684\u4f8b\u5b50\uff0c\u4f7f\u7528fetch\u8fdb\u884cajax\u8fdc\u7a0b\u52a0\u8f7d\u6570\u636e\uff0csetTimeOut\uff0c\u8fd8\u6709\u81ea\u5b9a\u4e49\u7684promise\u7b49\n\n\/*setTimeOut\u8ba1\u65f6\u5668\n\/\/\u4e24\u4e2a\u53c2\u6570\uff1a\u7b2c\u4e00\u4e2a\u662f\u8ba1\u65f6\u5b8c\u6210\u4e4b\u540e\u8c03\u7528\u7684\u56de\u8c03\u51fd\u6570\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u63a8\u8fdf\u591a\u4e45\n\/\/JS\u662f\u5355\u7ebf\u7a0b\u8bed\u8a00\uff0c\u5b83\u7684\u5f02\u6b65\u64cd\u4f5c\u4f7f\u7528event loop\u7684\u673a\u5236\u6765\u63a7\u5236\u7684\uff0c\u540c\u5b66\u53ef\u4ee5\u81ea\u5df1\u7814\u7a76\u4e00\u4e0b\n\nconsole.log(&#039;\u7b2c\u4e00\u884c\u4ee3\u7801&#039;);\nsetTimeout(()=&gt;{\n    console.log(&#039;1\u79d2\u540e\u6267\u884c\uff0c\u6253\u5370\u7ed3\u679c\u5728\u7b2c\u4e09&#039;);\n},1000);\nconsole.log(&#039;\u7b2c\u4e8c\u884c\u4ee3\u7801&#039;)\n\n\/\/output\n\/\/ index.js:11 \u7b2c\u4e00\u884c\u4ee3\u7801\n\/\/ index.js:15 \u7b2c\u4e8c\u884c\u4ee3\u7801\n\/\/ index.js:13 1\u79d2\u540e\u6267\u884c\uff0c\u6253\u5370\u7ed3\u679c\u5728\u7b2c\u4e09\n\/\/end\n\/** *\/\n\n\/*\u53d6\u6d88\u5b9a\u65f6\u5668\n\/\/\u5b9a\u4e49\u5b9a\u65f6\u5668\u7684\u65f6\u5019\uff0c\u628a\u5b83\u8d4b\u503c\u7ed9\u4e00\u4e2a\u53d8\u91cf\uff0c\u7136\u540e\u5728\u9700\u8981\u53d6\u6d88\u5b9a\u65f6\u5668\u7684\u5730\u65b9\u4f7f\u7528clear\n\nconsole.log(&#039;\u7b2c\u4e00\u884c\u4ee3\u7801&#039;);\nvar timer1 =  setTimeout(()=&gt;{\n    console.log(&#039;1\u79d2\u540e\u6267\u884c\uff0c\u6253\u5370\u7ed3\u679c\u5728\u7b2c\u4e09&#039;);\n},1000);\nconsole.log(&#039;\u7b2c\u4e8c\u884c\u4ee3\u7801&#039;)\n\nsetTimeout(()=&gt;{\n    clearTimeout(timer1);\n    console.log(&#039;\u4e2d\u65ad\u4e86timer1\u7684\u6267\u884c&#039;);\n},500);\n\n\/\/output:\n\/\/ \u7b2c\u4e00\u884c\u4ee3\u7801\n\/\/ index.js:31 \u7b2c\u4e8c\u884c\u4ee3\u7801\n\/\/ index.js:35 \u4e2d\u65ad\u4e86timer1\u7684\u6267\u884c\n\/\/end\n\/** *\/\n\n\/*P107-\u5f02\u6b65-setInterval*\/\n\/\/\u548csetTimeout\u7c7b\u4f3c\uff0c\u662f\u6bcf\u9694\u4e00\u6bb5\u65f6\u95f4\u6267\u884c\u4e00\u6b21\u56de\u8c03\u51fd\u6570\n\n\/*setInterval\nsetInterval(()=&gt;{\n    let date = new Date();\n    console.log(`${date.getHours()}:${date.getMinutes()}:${date.getSeconds()}`)\n},1000);\n\/\/output:\n\/\/ index.js:51 17:35:27\n\/\/ index.js:51 17:35:28\n\/\/ index.js:51 17:35:29\n\/\/ index.js:51 17:35:30\n\/\/ ......\/\/\u53ef\u4ee5\u4e00\u76f4\u6267\u884c\u4e0b\u53bb\n\/\/end\n\/** *\/\n\n\/*setInterval\u7684\u53d6\u6d88\nvar interval = setInterval(()=&gt;{\n    let date = new Date();\n    console.log(`${date.getHours()}:${date.getMinutes()}:${date.getSeconds()}`)\n},1000);\n\nsetTimeout(()=&gt;{\n    clearInterval(interval);\n},5000);\n\n\/\/outputs:\u6267\u884c5\u6b21\u4e4b\u540e\u5c31\u505c\u6b62\u4e86\n\/\/ index.js:66 17:39:43\n\/\/ index.js:66 17:39:44\n\/\/ index.js:66 17:39:45\n\/\/ index.js:66 17:39:46\n\/\/ index.js:66 17:39:47\n\/\/end\n\/** *\/\n\n\/*P108-\u5f02\u6b65-\u521b\u5efaPromise\n\/\/Promise\u53ef\u4ee5\u8ba9\u6211\u4eec\u521b\u5efa\u81ea\u5b9a\u4e49\u7684\u5f02\u6b65\u64cd\u4f5c\n\/\/\u628a\u4e00\u4e9b\u8017\u65f6\u7684\u5de5\u4f5c\u4ea4\u7ed9promise\uff0c\u5176\u4ed6\u540c\u6b65\u4ee3\u7801\u53ef\u4ee5\u7ee7\u7eed\u6267\u884c\n\n\/\/\u4ee5\u4e0b\u4e3a\u8001\u5e08\u8bb2\u89e3\u6587\u672c\uff0c\u8be6\u7ec6\u7814\u7a76\u4e4b\u7528\n\/\/\u4f7f\u7528new\u5173\u952e\u5b57\u521b\u5efa\u65b0\u7684Promise\u5bf9\u8c61\uff0c\u6784\u9020\u51fd\u6570Promise()\u4e2d\u4f7f\u7528\u56de\u8c03\u51fd\u6570A\u4f5c\u4e3a\u53c2\u6570\n\/\/\u56de\u8c03\u51fd\u6570A\u53c8\u63a5\u65362\u4e2a\u53c2\u6570\uff0cresolve\u51fd\u6570\u548creject\u51fd\u6570\uff0c\u3010\u8001\u5e08\u8fd9\u91cc\u53eb\u51fd\u6570\u3011\n\/\/resolve\u662f\u5728promise\u6267\u884c\u5b8c\u6bd5\u4e4b\u540e\uff0c\u8c03\u7528resolve\u8fd4\u56de\u6267\u884c\u7684\u7ed3\u679c\n\/\/\u63a5\u6536resolve\u53c2\u6570\uff0c\u4f20\u9012\u7684\u662f\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\uff0c\u8fd9\u6837\uff0c\u6211\u5728\u91cc\u9762\u6a21\u62df\u4e00\u4e0b\u4e00\u4e2a\u6bd4\u8f83\u8017\u65f6\u7684\u64cd\u4f5c\uff0c\u6211\u7528setTimeout\n\/\/\u4f20\u9012\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\u8fdb\u6765\uff0c\u65f6\u95f4\u8bbe\u7f6e2000\u6beb\u79d2\uff0c2\u79d2\u540e\uff0c\u6267\u884c{}\u4e2d\u5199\u7684resolve()\uff0c\n\/\/resolve()\u63a5\u6536\u4e00\u4e2a\u53c2\u6570\uff0c\u662f\u6267\u884c\u6210\u529f\u4e4b\u540e\u8fd4\u56de\u7684\u7ed3\u679c\u3002\u6bd4\u5982\u8bf4\uff0c\u8fd9\u91cc\u8fd4\u56de\u4e00\u4e2a\u5b57\u7b26\u4e32\u2018\u6267\u884c\u6210\u529f\u2019\uff0c\u8fd9\u6837\u5c31\u521b\u5efa\u4e86\u4e00\u4e2apromise\n\nvar promise = new Promise(resovle=&gt;{\n    setTimeout(()=&gt;{\n        resovle(&#039;\u6267\u884c\u6210\u529f(promise\u5185\u90e8\u8bed\u53e5)&#039;);\n    },2000);\n});\n\/** *\/\n\/*\u4ee5\u4e0b\u662f\u6211\u7684\u4e2a\u4eba\u601d\u8003\uff0c\u4e0d\u662f\u8001\u5e08\u7684\u8bb2\u89e3\n\/\/VH\uff1a\u6211\u80fd\u7406\u89e3\uff0c\u4e3b\u51fd\u6570\u5b9a\u4e49\u7684\u65f6\u5019\uff0c\u56de\u8c03\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u6ca1\u6709()\uff0c\u6211\u4eec\n\/\/\u8001\u5e08\u8bf4new Promise(resolve=&gt;{})\u8fd9\u4e2aresolve\u662f\u51fd\u6570\n\/\/\u6211\u89c1\u8fc7\u7684\u56de\u8c03\u51fd\u6570\uff0c\u662f\u4e3b\u51fd\u6570\u53c2\u6570\u6ca1\u6709\u62ec\u53f7\uff0c\u56de\u8c03\u51fd\u6570\u8f6c\u6362\u6210\u7bad\u5934\u51fd\u6570\u7684\u65f6\u5019\uff0c\u4fdd\u7559\u53c2\u6570\uff0c\u6ca1\u6709\u51fd\u6570\u540d\u3002\u8fd9\u4e2a\u53c2\u6570\u662f\u5e38\u89c1\u7684\u666e\u901a\u53d8\u91cf\u3002\n\/\/\u5982\u679c\u6211\u6240\u89c1\u7684\u4e3b\u51fd\u6570\u4e5f\u662f\u4e2a\u56de\u8c03\u51fd\u6570\u7684\u8bdd\uff0c\u5982\u4f55\u5199\u5462\uff1f\u56e0\u4e3a\u5b83\u7684\u53c2\u6570\u6ca1\u6709\u62ec\u53f7\uff0c\u6539\u5199\u6210\u7bad\u5934\u51fd\u6570\u7684\u65f6\u5019\uff0c\u5c31\u662f\u53c2\u6570=&gt;{},\u8fd9\u4e2a\u65f6\u5019\uff0c\u53c2\u6570\u5c31\u662f\u4e00\u4e2a\u51fd\u6570\u3002\n\/\/\u8fd9\u65f6\u5019\uff0c\u4e5f\u628a\u5b83\u7bad\u5934\u5316\uff0c\u6ca1\u6709\u81ea\u5df1\u7684\u540d\u5b57\uff0c\u53ea\u6709\u53c2\u6570\u540d\u5b57\uff0c\u76f4\u63a5\u53c2\u6570=&gt;{\u53c2\u6570(\u91cc\u9762\u53c8\u662f\u7bad\u5934\u51fd\u6570);}\uff0c\u4f46\u662fresolve=&gt;{resolve(&#039;\u6587\u5b57&#039;)}\uff0c\u8fd9\u4e0d\u5c31\u662f\u7c7b\u4f3crequest(result=&gt;{console.log(result)})\u76f4\u63a5\u8c03\u7528\u561b\u3002\n\/\/\u5b9a\u4e49\u7684\u65f6\u5019\uff0c\u56de\u8c03\u51fd\u6570\u4e5f\u662f\u628a\u51fd\u6570\u540d\u7559\u4e0b\uff0c\u51fd\u6570\u4f53\u5185\u51fd\u6570\u540d()\uff0c\u8fd9\u4e2a\u662f\u4ec0\u4e48\u65b9\u6cd5\uff1f\u5bf9\u6bd4\uff0c\u90a3\u4e2a\u53c2\u6570\u53ea\u662f\u666e\u901a\u53d8\u91cf\u6765\u8bf4\u90fd\u6539\u5199\uff0c\u662f\u4e0d\u662f\uff1f\u6211\u539f\u6765\u4ee5\u4e3a\u53c2\u6570\n\/\/\u4e0d\u662f\u8bf4\u5f02\u6b65\u7684\u53c2\u6570\u624d\u662f\u56de\u8c03\uff0c\u800c\u662f\u8bf4\u5f02\u6b65\u53ef\u4ee5\u7528\u56de\u8c03\u51fd\u6570\u3002\u4e5f\u53ef\u4ee5\u4e0d\u7528\u56de\u8c03\u3002\u540c\u6b65\u4ee3\u7801\u4e5f\u53ef\u4ee5\u56de\u8c03\u3002\n\/\/\u6211\u7684\u7591\u95ee\u5c31\u662f\u89e3\u51b3\u4e86\uff0c\u5bbf\u4e3b\u51fd\u6570\u5b9a\u4e49\u7684\u65f6\u5019\uff0c\u5c31\u5df2\u7ecf\u662f\u56de\u8c03\u7ed3\u6784\u4e86\u3002\u7bad\u5934\u51fd\u6570\u7684\u4f5c\u7528\uff0c\u5c31\u662f\u4e0d\u7528\u5199\u5b9a\u4e49\u56de\u8c03\u51fd\u6570\u7684\u6b63\u5f0f\u3002\u7701\u6389function\u548c\u51fd\u6570\u540d\u3002\u5176\u4ed6\u4e0d\u53d8\u3002\n\/\/\u90a3\u4e48\u5bbf\u4e3b\u51fd\u6570\u4e5f\u53d8\u6210\u4e86\u56de\u8c03\u600e\u4e48\u529e\uff1f\u6539\u5199\u6210\u7bad\u5934\u51fd\u6570\uff0c\u5c31\u662f\u53bb\u6389function\u548c\u51fd\u6570\u540d\uff0c\u53d8\u6210\u53c2\u6570=&gt;{\u53c2\u6570()\u7684\u6837\u5b50}\uff0c\u90a3\u4e48\u6211\u5e26\u7740\u81ea\u5df1\u7684\u56de\u8c03\u51fd\u6570\u7684\u65f6\u5019\uff0c\u600e\u4e48\u6539\u5199\u7bad\u5934\u5462\uff1f\nrequest(result=&gt;{result});\n\u53bb\u6389\u5b9a\u4e49\u65f6\u7684function\u548c\u51fd\u6570\u540d\uff0c\nPromise(cd=&gt;{cd()}),\u5982\u679c\u518d\u5e26\u56de\u8c03\u5462\uff1f\u89c1\u8fc7\u4e00\u4e2a\u8bf4\u662f\u56de\u8c03\u5730\u72f1\u7684\u4e1c\u897f\uff0c\u662f\u4e0d\u662f\u548c\u6211\u8fd9\u4e2a\u627e\u5230\u4e1c\u897f\u7c7b\u4f3c\u5462\uff1f\n\ntest(cd=&gt;{cd(\u8fd9\u91cc\u5e94\u8be5\u600e\u4e48\u5199\uff1f)}),\n\n\u4e5f\u8bb8\nfunction test(canshu){\n    canshu();\n}\nfunction request(cd){\n    cd();\n}\nfunction callback(result){\n    console.log(result);\n}\n\n\u524d\u4e24\u4e2a\u90fd\u662f\u56de\u8c03\u51fd\u6570\uff0c\u6700\u540e\u4e00\u4e2a\u4e0d\u662f\u56de\u8c03\u51fd\u6570\u3002\n\u5d4c\u5957\n\u540e\u4e24\u4e2a\u53ef\u4ee5\nrequest(result=&gt;{ console.log(result)})\ntest(canshu=&gt;{canshu()})\ntest(canshu=&gt;{canshu(result=&gt;{ console.log(result)})})\n\n\u8fd8\u6709\u5c31\u662f\u8fd9\u4e2a\u5c1a\u7845\u8c37\u8001\u5e08\u7684\u56de\u8c03\u5730\u72f1\u7684\u95ee\u9898\uff0c\u662f\u4e0d\u662f\u90a3\u6837\u7684\u5199\u6cd5\u662f\u56de\u8c03\u5462\uff1f\u4e0a\u9762\u7684\u4f8b\u5b50\u662f\u4ec0\u4e48\u6837\u7684\u56de\u8c03\u5462\uff1f\n\n\u5176\u5b9e\uff0c\u6211\u7ea0\u7ed3\u7684\u662f\u8001\u5e08\u7684\u90a3\u53e5\u8bdd\uff0c\u53c2\u6570\u662f\u51fd\u6570\u3002\u5176\u5b9e\u56de\u8c03\u90a3\u91cc\uff0c\nfunction request(cd){\n    cd();\n}\n\u5c31\u662f\u8bc1\u660e\u53ef\u4ee5\u76f4\u63a5\u5199\u8fd9\u4e2a\u56de\u8c03\u51fd\u6570\u3002\n\n\u7b2c\u4e8c\u4e2a\u95ee\u9898\u5c31\u662f\u8fd93\u5c42\u7684\u600e\u4e48\u53ea\u5199\u7bad\u5934\u51fd\u6570\u7684\u6837\u5f0f\u3002\n\u6b63\u5e38\u8c03\u7528\u662f\ntest(request(callback))?\u662f\u8fd9\u6837\u7684\u4e48\uff1f\u8fd9\u4e2a\u6015\u4e0d\u662f\u554a\u3002\u8fd9\u4e2a\u4e0d\u5c31\u662f\u90a3\u4e2a\u6b63\u5e38\u7684\u8c03\u7528\u4e48\uff1f\u51fd\u6570\u7ed3\u679c\u5728\u53c2\u6570\u4e48\u3002\u4e0d\u540c\u7684\u5730\u65b9\u5728\u4e8e\uff0c\u76f4\u63a5\u51fd\u6570\u7ed3\u679c\u505a\u53c2\u6570\uff0c\u662f\u51fd\u6570\u8fd0\u884c\u5b8c\u6bd5\uff0c\u8fd4\u56de\u503c\u56de\u6765\u4e4b\u540e\u505a\u53c2\u6570\u3002\n\u8fd9\u4e2a\u56de\u8c03\uff0c\u662f\u628a\u5f53\u505a\u53c2\u6570\u7684\u51fd\u6570\u653e\u5728\u81ea\u5df1\u7684\u5faa\u73af\u4f53\u5185\u3002\u5176\u5b9e\uff0c\u51fd\u6570\u8fd0\u884c\u5b8c\u6bd5\uff0c\u4e5f\u662f\u878d\u5165\u5230\u51fd\u6570\u4f53\u5185\u554a\u3002\u6bd5\u7adf\u53c2\u6570\u5728\u51fd\u6570\u4f53\u5185\u7684\u4f4d\u7f6e\u4e0d\u540c\u3002\u5b83\u80fd\u8fd8\u539f\u6210\u4e00\u4e2a\u51fd\u6570\u6309\u987a\u5e8f\u6267\u884c\u3002\u770b\u6765\u6211\u7684\u7406\u89e3\u8fd8\u662f\u4e0d\u884c\n\u56de\u8c03\u51fd\u6570\uff0c\u5c31\u662f\u81ea\u5df1\u8fd0\u884c\u8fc7\u7a0b\u4e2d\uff0c\u8c03\u7528\u5176\u4ed6\u7684\u51fd\u6570\u6765\u6267\u884c\u4e00\u4e0b\u3002\n\u50cf\u4e0a\u9762\u8fd9\u6837\uff1a\u60f3\u5230\u54ea\u91cc\uff0c\u5199\u5230\u54ea\u91cc\uff0c\u7528\u5199\u5177\u4f53\u5316\u601d\u7ef4\uff0c\u6bd4\u5149\u60f3\u8fd8\u597d\u3002\u7279\u522b\u662f\u8fd9\u4e48\u7ed5\u7684\u5730\u65b9\u3002\n===\u672a\u5b8c\u5f85\u7eed\n\/\/\u56de\u8c03\u51fd\u6570\u7684\u4f5c\u7528\uff0c\u662f\u5f02\u6b65\u7684\u89e3\u51b3\u65b9\u5f0f\u4e4b\u4e00\u3002\n\/\/\u53e6\u5916,\u6211\u8bb0\u5f97\u6709\u4e2a\u6392\u5e8f,\u6570\u7ec4\u6392\u5e8f,\u4f7f\u7528\u56de\u8c03\u51fd\u6570,\u8ba9\u56de\u8c03\u51fd\u6570\u6765\u5b8c\u6210.\u6216\u8005,\u8bb0\u5f97\u662f\u7279\u5b9a\u7684\u5f0f\u5b50\u3002\u4e0d\u77e5\u9053\u8fd8\u6709\u6ca1\u6709\u7b14\u8bb0\u5565\u90fd\u3002\n\/** *\/\n\n\/*P109-\u5f02\u6b65-\u5b8c\u6210\u56de\u8c03\n\/\/\u590d\u5236\u5fc5\u8981\u4ee3\u7801\nvar promise = new Promise(resovle=&gt;{\n    setTimeout(()=&gt;{\n        resovle(&#039;\u6267\u884c\u6210\u529f(promise\u5185\u90e8\u8bed\u53e5)&#039;);\n    },2000);\n});\n\/\/promise\u4f7f\u7528then\u6765\u83b7\u53d6\u6267\u884c\u7ed3\u679c\uff0c\n\/\/\u8fd9\u4e2a\u65b9\u6cd5\u5728promise\u6267\u884c\u5b8c\u6bd5\u4e4b\u540e\u624d\u4f1a\u6267\u884c\uff0c\u628aresolve()\u7684\u62ec\u53f7\u91cc\u7684\u503c\u5f53\u505a\u53c2\u6570\n\/\/VH\uff1athen()\u7684\u53c2\u6570\u662f\uff1f\u4ec0\u4e48\u51fd\u6570\u6837\u5f0f\uff1f\u5fd8\u8bb0\u4e86\u3002\u5355\u53c2\u6570\u6837\u5f0f\u5427\u3002\u7bad\u5934\u51fd\u6570\u7684\u5355\u53c2\u6570\u6837\u5f0f\u3002\n\/\/VH\uff1avalue\u53ea\u662f\u4e00\u4e2a\u53c2\u6570\u4ee3\u79f0\uff0c\npromise.then(value =&gt; console.log(value));\nconsole.log(&#039;\u5728Promise\u4e4b\u524d\u6267\u884c\uff08\u4ee3\u7801\u5199\u5728promise\u4e4b\u540e\uff09&#039;);\n\n\/\/outputs\uff1apromise\u5360\u7528\u65f6\u95f4\u957f\u7684\u4ee3\u7801\u6ca1\u6709\u5f71\u54cd\u540e\u9762\u540c\u6b65\u4ee3\u7801\u7684\u6267\u884c\n\/\/ index.js:96 \u5728Promise\u4e4b\u524d\u6267\u884c\uff08\u4ee3\u7801\u5199\u5728promise\u4e4b\u540e\uff09\n\/\/ index.js:95 \u6267\u884c\u6210\u529f(promise\u5185\u90e8\u8bed\u53e5)\n\/\/end\n\/** *\/\n\n\/\/VH\uff1a\u8865\u5145\uff0c\n\/\/\u5176\u5b9e\u5b8c\u6574\u7684promise\u542b\u6709\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\uff08VH\uff1a\u5bc4\u751f\u51fd\u6570\uff0c2\u4e2a\u53c2\u6570resolve\u548creject\uff09\n\/\/\u6280\u672f\u86cb\u8001\u5e08 https:\/\/www.bilibili.com\/video\/BV1QV411a7Hu?share_source=copy_web\n\/\/\u5c1a\u7845\u8c37 https:\/\/www.bilibili.com\/video\/BV1GA411x7z1?p=3&amp;share_source=copy_web\n\/\/\u4e24\u4e2a\u7f51\u9875\u90fd\u662f\u4f7f\u7528if...else...\u6765\u5206\u9694resolve()\u548creject()\uff0c\n\/\/VH\uff1a\u4e0d\u540c\u4e8e\u5176\u4ed6\u51fd\u6570\u7684return\uff0c\u8fd9\u91cc\u4e0d\u7528\uff0c\u53ea\u8981\u4f7f\u7528resolve()\u5c31\u662f\u8fd4\u56de\u503c\u3002\u800c\u4e14\u540e\u9762\u4f7f\u7528then\u81ea\u52a8\u4f20\u5165\u7684\u662fresolve\u65e0\u7f1d\u8854\u63a5\u3002\n\/\/\u5728\u4e00\u4e2a\u7f51\u9875\u6559\u7a0b\u4e2d\uff0c\u8bf4\u5230resolve\u662f\u5fc5\u987b\uff0c\u5176\u4ed6\u65e0\u6240\u8c13\u3002\n\/\/\u6211\u611f\u89c9promise\u50cf\u4e00\u4e2a\u76d2\u5b50\uff0c\u9884\u8bbe2\u4e2a\u51fa\u53e3\u3002\u65e0\u8bba\u600e\u4e48\u6837\uff0c\u7ed3\u679c\u5c31\u4ece\u8fd9\u91cc\u51fa\u6765\u3002\u3010\u4e00\u4e2a\u6559\u7a0b\u8bf4promise\u8bed\u6cd5\u662f\u6784\u9020\u51fd\u6570\uff0c\u529f\u80fd\u662f\u5c01\u88c5\u4e00\u4e2a\u5f02\u6b65\u64cd\u4f5c\u3011\n\/\/\u5173\u4e8e\u5f02\u6b65\u548c\u540c\u6b65\uff0c\u591a\u7ebf\u7a0b\uff0c\u591a\u8fdb\u7a0b\uff0c\u6211\u770b\u4e86\u4e00\u4e9b\u8d44\u6599\u3002\u6ca1\u61c2\uff0c\u4f46\u662f\u53ef\u4ee5\u6682\u65f6\u5b9a\u4e0b\u7ed3\u8bba\uff1a\u5f02\u6b65\u662f\u7a0b\u5e8f\u5c42\u9762\u7684\u6267\u884c\u987a\u5e8f\u95ee\u9898\uff0c\u591a\u7ebf\u7a0b\uff0c\u591a\u8fdb\u7a0b\u662f\u6d89\u53ca\u5230CPU\u7684\u95ee\u9898\u3002\u6682\u65f6\u8fd9\u4e48\u7406\u89e3\u5427\u3002\n\n\/*\u5176\u4ed6\u5730\u65b9\u7684\u4f8b\u5b50-\u6280\u672f\u86cb\u8001\u5e08\n\/\/\u4f8b\u5b50\u4e2d\u5e38\u91cfisPregnat\u7b49\u4e8etrue\uff0c\u5bf9\u5e94\u4e0b\u9762\u7684\u6253\u5370\u7ed3\u679c\u3002\u5982\u679c\u6539\u4e3afalse\uff0c\u5c31\u662f\u201c\u7537\u4eba\u6210\u4e86\u8001\u516c\u201d\nconst isPregnant = true;\nconst promise = new Promise((resolve, reject)=&gt;{\n    if (isPregnant){\n        resolve(&#039;\u5b69\u5b50\u4ed6\u7239&#039;);\n    } else{\n        reject(&#039;\u8001\u516c&#039;);\n    }\n});\n\npromise\n    .then(name=&gt;{\n        console.log(`\u7537\u4eba\u6210\u4e3a\u4e86${name}\uff01`);\n    })\n    .catch(name=&gt;{\n        console.log(`\u7537\u4eba\u6210\u4e3a\u4e86${name}\uff01`);\n    })\n    .finally(()=&gt;{\n        console.log(`\u7537\u4eba\u548c\u5973\u4eba\u6700\u7ec8\u7ed3\u5a5a\u4e86\uff01`);\n    });\n\/\/outputs\n\/\/ index.js:127 \u7537\u4eba\u6210\u4e3a\u4e86\u5b69\u5b50\u4ed6\u7239\uff01\/\/\u5982\u679cisPregnat\u7b49\u4e8efalse\uff0c\u8fd9\u53e5\u5c31\u662f\u5c31\u662f\u201c\u7537\u4eba\u6210\u4e86\u8001\u516c\u201d\n\/\/ index.js:133 \u7537\u4eba\u548c\u5973\u4eba\u6700\u7ec8\u7ed3\u5a5a\u4e86\uff01\n\/\/end\n\/** *\/\n\n\/*P110-\u5f02\u6b65-Promise\u5f02\u5e38\u6355\u83b7\n\/\/\u5982\u679c\u5f02\u6b65\u64cd\u4f5c\u6ca1\u6709\u6267\u884c\u6210\u529f\uff0c\u9700\u8981\u629b\u51fa\u5f02\u5e38\uff0c\u6211\u4eec\u53ef\u4ee5\u7ed9Promise\u63a5\u6536\u5230\u56de\u8c03\u51fd\u6570\u91cc\u9762\uff0c\u52a0\u5165\u7b2c\u4e8c\u4e2a\u53c2\u6570reject\uff0c\n\/\/\u662f\u6267\u884c\u51fa\u9519\u540e\uff0c\u6267\u884c\u7684\u65b9\u6cd5\uff0c\u91cc\u9762\u53ef\u4ee5\u4f20\u9012\u4e00\u4e9b\u9519\u8bef\u4fe1\u606f\uff0c\u7136\u540e\u8fd9\u4e9b\u5c31\u4ee3\u8868promise\u6267\u884c\u6709\u5f02\u5e38\u4e86\n\/\/\u4e0b\u9762\u4ee3\u7801\u6267\u884c\u540e\uff0c\u6253\u5370\u7ed3\u679c\u4f1a\u51fa\u73b0Uncaught\u672a\u6355\u83b7\u5f02\u5e38\nvar promise = new Promise((resovle,reject)=&gt;{\n    setTimeout(()=&gt;{\n        reject(&#039;\u6267\u884c\u5931\u8d25(promise\u5185\u90e8\u8bed\u53e5)&#039;);\/\/Uncaught (in promise) \u6267\u884c\u5931\u8d25(promise\u5185\u90e8\u8bed\u53e5)\n    },2000);\n});\n\/\/ promise.then(value =&gt; console.log(value));\/\/\u6807\u8bb0216\nconsole.log(&#039;\u5728Promise\u4e4b\u524d\u6267\u884c\uff08\u4ee3\u7801\u5199\u5728promise\u4e4b\u540e\uff09&#039;);\n\n\/\/outputs\n\/\/ index.js:217 \u5728Promise\u4e4b\u524d\u6267\u884c\uff08\u4ee3\u7801\u5199\u5728promise\u4e4b\u540e\uff09\n\/\/ index.html:1 Uncaught (in promise) \u6267\u884c\u5931\u8d25(promise\u5185\u90e8\u8bed\u53e5)\n\/\/end\n\/\/ \u6ce8\u610f\uff1a\u5982\u679c\u6ca1\u6709\u6807\u8bb0216\u8bed\u53e5\uff0c\u90a3\u4e48\u6253\u5370\u7ed3\u679c\u662f\uff0c\u9519\u8bef\u7d22\u5f15\u662findex.js:213\n\/\/ index.js:213 Uncaught (in promise) \u6267\u884c\u5931\u8d25(promise\u5185\u90e8\u8bed\u53e5)\n\n\/\/\u4f7f\u7528catch\u6765\u6355\u83b7\u5f02\u5e38\n\/\/\u56de\u8c03\u51fd\u6570\u7684\u53c2\u6570\u5c31\u662fpromise\u6267\u884c\u5931\u8d25\u4f20\u56de\u6765\u7684\u9519\u8bef\u4fe1\u606f\uff0c\n\/\/\u4e0b\u9762\u4f7f\u7528\u53c2\u6570error\u53d8\u91cf\u540d\u5b57\u63a5\u6536\u9519\u8bef\u4fe1\u606f\uff0c\u5e76\u5728\u51fd\u6570\u4f53\u5185\u6253\u5370\n\/\/\u6253\u5370\u7ed3\u679c\u662fpromise\u4e2dreject()\u4e2d\u5b9a\u4e49\u7684\u9519\u8bef\u4fe1\u606f\uff0c\u5c31\u6ca1\u6709uncaught\u7684\u63d0\u793a\u4e86\npromise.catch(error=&gt; console.log(error));\n\/\/outputs\n\/\/ index.js:218 \u5728Promise\u4e4b\u524d\u6267\u884c\uff08\u4ee3\u7801\u5199\u5728promise\u4e4b\u540e\uff09\n\/\/ index.js:228 \u6267\u884c\u5931\u8d25(promise\u5185\u90e8\u8bed\u53e5)\n\/\/end\n\/** *\/\n\n\/*P111-\u5f02\u6b65-Promise \u94fe\u5f0f\u8c03\u7528*\/\n\n\/*\u94fe\u5f0f\u8c03\u7528\n\/\/Promise\u5728\u6bcf\u6b21\u8c03\u7528then\u6216\u8005catch\u7684\u65f6\u5019\uff0c\u5176\u5b9e\u4e5f\u90fd\u8fd4\u56de\u4e86\u4e00\u4e2a\u65b0\u7684promise\u5bf9\u8c61\uff0c\n\/\/\u6211\u4eec\u5728\u5b83\u57fa\u7840\u4e0a\u7ee7\u7eed\u8c03\u7528.then\u6216\u8005.catch\uff0c\u6bd4\u5982\u8bf4\uff0c\u6211\u8fd9\u91cc\u6709\u4e00\u4e2a\u4f8b\u5b50\uff0c\n\/\/\u521b\u5efa\u4e00\u4e2a\u65b0\u7684promise\u57281\u79d2\u4e4b\u540e\u6267\u884c\u6210\u529f\uff0c\u8fd4\u56de\u4e00\u4e2a\u6570\u5b571\n\nnew Promise((resolve,reject)=&gt;{\n    setTimeout(()=&gt;{\n        resolve(1);\n    },1000)\n})\n    .then(value=&gt;{\n        console.log(value);\/\/\u6807\u8bb0249\n        return value+10;\n    })\n    .then(value=&gt;{\n        console.log(value);\/\/\u6807\u8bb0253\n        return new Promise(resolve=&gt;resolve(value+20));\n    })\n    .then(value=&gt;{\n        console.log(value);\/\/\u6807\u8bb0257\n    });\n\n\/\/outputs\n\/\/ index.js:249 1\n\/\/ index.js:253 11\n\/\/ index.js:257 31\n\/\/end\n\n\/** *\/\n\n\/*promise\u4e2d\u7684\u5f02\u5e38\n\/\/promise\u7684reject\u5f02\u5e38\uff0c\u8fd8\u6709then\u91cc\u9762throw\u629b\u51fa\u6765\u7684\u5f02\u5e38\uff0c\n\/\/\u9664\u4e86\u8ddf\u5728then\u540e\u9762\u7528catch\u5904\u7406\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u628acatch\u653e\u5230\u6700\u540e\u4e00\u4e2athen\u540e\u9762\u7edf\u4e00\u5904\u7406\nnew Promise((resolve,reject)=&gt;{\n    setTimeout(()=&gt;{\n        \/\/resolve(1);\/\/\u6ce8\u91ca\u540e\u6539\u5199\uff0c\u6ee1\u8db3\u8bb2\u89e3\u5f02\u5e38\u5904\u7406\u7684\u9700\u8981\n        reject(&#039;Promise \u5931\u8d25&#039;);\/\/\u6807\u8bb0276\n    },1000)\n})\n    .then(value=&gt;{\n        console.log(value);\n        return value+10;\n    })\n    .then(value=&gt;{\n        console.log(value);\n        return new Promise(resolve=&gt;resolve(value+20));\n    })\n    .then(value=&gt;{\n        console.log(value);\n    })\n    \/\/\u8fd9\u91cc\u6dfb\u52a0.catch\u6355\u83b7\u5f02\u5e38\uff0c\u7ed3\u679c\u663e\u793a\u80fd\u591f\u6355\u83b7\u5230promise\u4e2d\u7684\u5f02\u5e38\u2018Promise \u5931\u8d25\u2019\uff08\u6807\u8bb0276\uff09\n    \/\/\u800c\u4e14catch\u4e4b\u524d\u7684\u6240\u6709\u7684.then\u90fd\u6ca1\u6709\u7ee7\u7eed\u6267\u884c\n    .catch(error=&gt;{\n        console.log(error);\/\/\u6807\u8bb0292\n    });\n    \/\/outputs\n    \/\/index.js:292 Promise \u5931\u8d25\n    \/\/end\n\/** *\/\n\n\/*then\u4e2d\u629b\u51fa\u7684\u5f02\u5e38\nnew Promise((resolve,reject)=&gt;{\n    setTimeout(()=&gt;{\n        resolve(1);\n    },1000)\n})\n    .then(value=&gt;{\n        console.log(value);\/\/\u6807\u8bb0307\n        throw &#039;then1\u5f02\u5e38&#039;;\n        return value+10;\n    })\n    .then(value=&gt;{\n        console.log(value);\n        return new Promise(resolve=&gt;resolve(value+20));\n    })\n    .then(value=&gt;{\n        console.log(value);\n    })\n    \/\/\u8fd9\u91cc\u6dfb\u52a0.catch\u6355\u83b7\u5f02\u5e38\uff0c\u7ed3\u679c\u663e\u793a\u80fd\u591f\u6355\u83b7\u5230\u7b2c\u4e00\u4e2a.then\u4e2dthrow\u7684\u5f02\u5e38\u2018hen1\u5f02\u5e38\u2019\uff08\u6807\u8bb0307\uff09\n    \/\/\u7b2c\u4e00\u4e2a.then\u540e\u7684.then\u90fd\u4e0d\u518d\u6267\u884c\uff0c\u800c\u4e14\u4efb\u4f55\u4e00\u4e2a.then\u4e2d\u5982\u679cthrow\u5f02\u5e38\uff0c\u90fd\u662f\u53ef\u4ee5\u6355\u6349\u5230\u7684\u3002\n    .catch(error=&gt;{\n        console.log(error);\/\/\u6807\u8bb0321\n    });\n\/\/outputs\uff1a\n\/\/ index.js:307 1\n\/\/ index.js:321 then1\u5f02\u5e38\n\/\/end\n\n\/\/\u4ee5\u4e0a\u5c31\u662fpromise\u7684\u94fe\u5f0f\u8c03\u7528\uff0c\u6bcf\u6b21\u8c03\u7528.then\u6216\u8005.catch\u4e4b\u540e\uff0c\n\/\/\u5b83\u8fd8\u4f1a\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684promise\uff0c\u57fa\u4e8e\u5b83\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5176\u4e2d\u7684\u65b9\u6cd5\u3010\uff1f\u5565\u610f\u601d?\u3011\n\/** *\/\n\n\/*P112-\u5f02\u6b65-\u591a\u4e2aPromise\u540c\u65f6\u6267\u884c\n\/\/\u4f7f\u7528promise.all\u53ef\u4ee5\u4f7f\u591a\u4e2apromise\u540c\u65f6\u6267\u884c\uff0c\u5b83\u4f1a\u8fd4\u56de\u4e00\u4e2a\u6574\u4f53\u7684\u5927Promise\uff0c\n\/\/\u5728\u6240\u6709\u7684promise\u6267\u884c\u5b8c\u4e4b\u540e\uff0c\u5b83\u4f1a\u8fd4\u56de\u4e00\u4e2a\u7ed3\u679c\u6570\u7ec4\uff0c\u5206\u522b\u662f\u6bcf\u4e2apromise\u8fd4\u56de\u7684\u503c\n\/\/\u987a\u5e8f\u548c\u54b1\u4eec\u4f20\u7ed9\u5b83\u7684promise\u6570\u7ec4\u5143\u7d20\u7684\u987a\u5e8f\u662f\u4e00\u6837\u7684\uff0c\u800c\u4e0d\u662f\u6309\u7167\u8fd4\u56de\u7ed3\u679c\u5feb\u6162\u7684\u987a\u5e8f\n\n\/\/\u4ee5\u4e0b3\u4e2apromise\uff0c\u5176\u4e2d\u5d4c\u5957\u7684setTimeout\uff0c\u5206\u522b\u662f1\u79d2\uff0c2\u79d2\uff0c0.5\u79d2\uff0c\n\/\/\u4f46\u662f\u6700\u540ePromise.all([p1,p2,p3])\u4e2d\u6570\u7ec4\u6309[p1,p2,p3]\u7684\u987a\u5e8f\uff0c\n\/\/then\u4e2d\u8fd4\u56de\u503c\u662f\u4e2a\u6570\u7ec4\uff0c\u5143\u7d20\u4e5f\u662f\u6309[p1,p2,p3]\u7684\u987a\u5e8f\uff0c\u4e0d\u662f\u6267\u884c\u5feb\u6162\u7684\u987a\u5e8f\nvar p1 = new Promise(resolve=&gt;{\n    setTimeout(()=&gt;{\n        resolve(1);\n    },1000)\n});\n\nvar p2= new Promise(resolve =&gt;{\n    setTimeout(()=&gt;{\n        resolve(2);\n    },2000)\n});\n\nvar p3= new Promise(resolve=&gt;{\n    setTimeout(() =&gt; {\n        resolve(3);\n    }, 500);\n});\n\nPromise.all([p1,p2,p3]).then(values =&gt; console.log(values));\n\/\/outputs\n\/\/ index.js:356 (3)\u00a0[1, 2, 3]\n\/\/end\n\/** *\/\n\n\/*P113-\u5f02\u6b65-async\u548cawait*\/\n\/\/\u662f\uff0c\u4f46\u4e0d\u5b8c\u5168\u662fpromise\u7684\u8bed\u6cd5\u7cd6\n\/\/\u54b1\u4eec\u4f7f\u7528async\u5173\u952e\u5b57\u521b\u5efa\u7684\u51fd\u6570\uff0c\u5c31\u7b49\u4e8e\u8bf4\u662f\u521b\u5efa\u4e86\u4e00\u4e2apromise\n\/\/\u4f7f\u7528async\u548cawait\u7684\u597d\u5904\u662f\uff1a\u53ef\u4ee5\u4f7f\u7528\u540c\u6b65\u7684\u4ee3\u7801\u6837\u5f0f\uff0c\u6765\u6267\u884c\u5f02\u6b65\u7684\u4ee3\u7801\uff0c\u6bd4\u8f83\u76f4\u89c2\n\n\/*async\n\nasync function async1(){\n    setTimeout(() =&gt; {\n        console.log(&#039;async1 \u6267\u884c\u5b8c\u6bd5&#039;);\/\/\u6807\u8bb0373\n    }, 1000);\n}\n\n\/\/\u6253\u5370async1()\u51fd\u6570\u7684\u8fd4\u56de\u503c\/\/VH:\u9700\u8981\u5e26()\u624d\u4f1a\u8fd0\u884c\u624d\u6709\u8fd4\u56de\u503c\n\/\/\u8fd4\u56de\u7684\u7ed3\u679c\u662f\u4e00\u4e2aPromise\nasync1();\/\/async1 \u6267\u884c\u5b8c\u6bd5\nconsole.log(async1());\/\/\u6807\u8bb0380\n\/\/output\uff1a\n\/\/ index.js:380 Promise\u00a0{&lt;fulfilled&gt;: undefined}\n    \/\/ __proto__: Promise\n    \/\/ [[PromiseState]]: &quot;fulfilled&quot;\n    \/\/ [[PromiseResult]]: undefined\n\/\/ 2index.js:373 async1 \u6267\u884c\u5b8c\u6bd5\n\/\/end\n\/\/\u6ce8\u610f\uff0c\u8001\u5e08\u7684\u8bfe\u5802\u4e2d\uff0c\u51fa\u73b0\u7684\u7ed3\u679c\u662fPromise{&lt;resolved&gt;:undefined},\n\/\/\u533a\u522b\u5728\u4e8e&lt;fulfilled&gt;\u548c&lt;resolved&gt;\n\/** *\/\n\n\/*await\u7684\u7528\u6cd5\n\/\/await\u53ef\u4ee5\u7528\u5728async\u7684\u51fd\u6570\u91cc\u9762\uff0c\u7528\u6765\u63a5\u6536\u53e6\u4e00\u4e2aasync\u51fd\u6570\u7684\u7ed3\u679c\n\/\/await\u5173\u952e\u5b57\u5fc5\u987b\u5728\u5e26async\u5173\u952e\u5b57\u7684\u51fd\u6570\u4e2d\u8c03\u7528\n\nasync function async1(){\n    let result2 = await async2();\n    console.log(result2);\/\/\u6807\u8bb0398\n}\n\nasync function async2(){\n    return new Promise(resolve =&gt;{\n        setTimeout(() =&gt; {\n            resolve(10);\n        }, 1000);\n    });\n}\n\n\/\/\u8c03\u7528aysnc()\u51fd\u6570\uff0c\u57281\u79d2\u4e4b\u540e\u5f97\u5230\u503c10\nasync1();\/\/index.js:398 10\n\/** *\/\n\n\/*await\u591a\u4e2aasync\u7684\u51fd\u6570\n\/\/\u8fd4\u56de\u7684\u987a\u5e8f\u548c\u4ee3\u7801\u5b9a\u4e49\u7684\u987a\u5e8f\u662f\u4e00\u6837\u7684,VH:\u6bd4\u5982\u4e0b\u9762\u4f8b\u5b50\uff0c\u6807\u8bb0419\u548c\u6807\u8bb0420\u7684\u987a\u5e8f\u3002\n\/\/\u90a3\u4e48\u7ed3\u679c\u4e5f\u662f\u6309\u8fd9\u4e2a\u987a\u5e8f\uff0c\u800c\u4e0d\u662fasync\u51fd\u6570\u4e2d\u7684setTimout\u6267\u884c\u5feb\u6162\u7684\u987a\u5e8f\n\nasync function async1(){\n    let result2 = await async2();\n    let result3 = await async3();\n    console.log(result2);\/\/\u6807\u8bb0419\n    console.log(result3);\/\/\u6807\u8bb0420\n}\n\nasync function async2(){\n    return new Promise(resolve =&gt;{\n        setTimeout(() =&gt; {\n            resolve(10);\n        }, 1000);\n    });\n}\n\nasync function async3(){\n    return new Promise(resolve =&gt;{\n        setTimeout(() =&gt; {\n            resolve(8);\n        }, 500);\n    });\n}\n\nasync1();\n\/\/outputs:\n\/\/ index.js:419 10\n\/\/ index.js:420 8\n\/\/end\n\n\/** *\/\n\n\/*\u6355\u83b7\u5f02\u5e38\n\/\/async\u7684\u51fd\u6570\u4e2d\u4e5f\u53ef\u4ee5\u629b\u51fa\u5f02\u5e38\n\/\/\u5728await\u7684\u65f6\u5019\uff0c\u4f7f\u7528try...catch...\u6765\u6355\u83b7\u5f02\u5e38\n\/\/\u5982\u679c\u4e0d\u7528try,catch\u7684\u8bdd\uff0c\u63a7\u5236\u53f0\u4f1a\u51fa\u73b0Uncaught(in index.js:80 promise)\n\/\/80\u662f\u8001\u5e08\u7684\u89c6\u9891\u4e2d\u7b2c\u4e00\u4e2aasync\u7684\u6700\u540e\u7684}\u7684\u4f4d\u7f6e\uff0c\u5bf9\u5e94\u6807\u8bb0463\u3002\n\/\/VH\uff1a\u4f46\u662f\u8fd9\u91cc\u4f7f\u7528try...catch...\u5c31\u65e0\u6cd5\u83b7\u53d6result3\u7684\u503c\u4e86\u3002\u56e0\u4e3a\u662flet\u79c1\u6709\u53d8\u91cf\u3002\u5982\u4f55\u4e8c\u8005\u517c\u5f97\u5462\uff1f\n\n\/\/\u4f8b\u5b50\u4e2d\u662f\u7b2c\u4e09\u4e2aasync\u51fd\u6570\u4e2d\u51fa\u9519\uff0c\u90a3\u4e48\u5728\u7b2c\u4e00\u4e2aasync\u4e2d\u4f7f\u7528await\u8c03\u7528\u8fd9\u4e2aasync3()\u7684\u65f6\u5019\uff0c\u5c31\u62a5\u9519\n\/\/\u4f7f\u7528try...catch...\u76d1\u63a7let result3 = await async3()\u8bed\u53e5\uff0c\u51c6\u5907\u6355\u83b7\u9519\u8bef\u4fe1\u606f\n\/\/\u8f93\u51fa\u987a\u5e8f\uff0c\u8fd8\u662f\u6309\u7167\u8fd9\u4e2a\u4ee3\u7801\u4e66\u5199\u987a\u5e8f\u6765\u7684\u3002\u7ed3\u679c\u4e3a\u5148\u62a5\u9519\uff0c\u518d\u6253\u5370result2\u7684\u503c\nasync function async1(){\n    let result2 = await async2();\n    try {\n        let result3 = await async3();\n    } catch(e){\n        console.log(e);\n    }\n    console.log(result2);\/\/\u6807\u8bb0459\n    \/\/console.log(result3);\/\/\u8fd9\u4e2aresult3\u5c31\u4e0d\u8981\u4e86\u3002\n}\/\/\u6807\u8bb0463\n\nasync function async2(){\n    return new Promise(resolve =&gt;{\n        setTimeout(() =&gt; {\n            resolve(10);\n        }, 1000);\n    });\n}\n\nasync function async3(){\n    return new Promise((resolve,reject) =&gt;{\n        setTimeout(() =&gt; {\n            reject(&#039;\u6267\u884c\u51fa\u9519&#039;);\n        }, 500);\n    });\n}\n\nasync1();\n\/\/outputs\n\/\/ index.js:457 \u6267\u884c\u51fa\u9519\n\/\/ index.js:459 10\n\/\/end\n\n\/** *\/<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\/*P106-\u5f02\u6b65-setTimeout*\/ 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