{"id":154367,"date":"2024-05-08T11:31:14","date_gmt":"2024-05-08T03:31:14","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/154367.html"},"modified":"2024-05-08T11:31:20","modified_gmt":"2024-05-08T03:31:20","slug":"%e5%9c%a8-javascript-%e4%b8%ad%ef%bc%8c%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8%e4%ba%8b%e4%bb%b6%e5%be%aa%e7%8e%af%e6%9c%ba%e5%88%b6%e5%a4%84%e7%90%86%e5%bc%82%e6%ad%a5%e4%bb%bb%e5%8a%a1%e7%9a%84","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/154367.html","title":{"rendered":"\u5728 JavaScript \u4e2d\uff0c\u5982\u4f55\u4f7f\u7528\u4e8b\u4ef6\u5faa\u73af\u673a\u5236\u5904\u7406\u5f02\u6b65\u4efb\u52a1\u7684\u6267\u884c\u987a\u5e8f"},"content":{"rendered":"

\"\u5728<\/p>\n

\u5728 JavaScript \u4e2d, \u4f7f\u7528\u4e8b\u4ef6\u5faa\u73af\u673a\u5236\u5904\u7406\u5f02\u6b65\u4efb\u52a1\u7684\u6267\u884c\u987a\u5e8f\u4e3b\u8981\u4f9d\u8d56\u4e8e\u5fae\u4efb\u52a1\uff08microtask\uff09\u548c\u5b8f\u4efb\u52a1\uff08macrotask\uff09\u7684\u533a\u522b\u3001\u4e8b\u4ef6\u961f\u5217<\/strong>\u4ee5\u53ca<\/strong>\u4efb\u52a1\u7684\u4f18\u5148\u7ea7<\/strong>\u3002\u4e8b\u4ef6\u5faa\u73af<\/strong>\u662f JavaScript \u8fd0\u884c\u65f6\u73af\u5883\u7684\u6838\u5fc3\u673a\u5236\uff0c\u5b83\u5141\u8bb8 JavaScript \u4ee3\u7801\u5728\u5355\u7ebf\u7a0b\u4e2d\u8fd0\u884c\uff0c\u540c\u65f6\u5904\u7406\u5f02\u6b65\u64cd\u4f5c\u3002\u901a\u8fc7\u7406\u89e3\u548c\u5229\u7528\u4e8b\u4ef6\u5faa\u73af\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u6709\u6548\u5730\u63a7\u5236\u5f02\u6b65\u4efb\u52a1\u7684\u6267\u884c\u987a\u5e8f\uff0c\u6539\u5584\u7a0b\u5e8f\u54cd\u5e94\u6027\u548c\u6027\u80fd\u3002<\/p>\n<\/p>\n

\u5fae\u4efb\u52a1<\/strong>\u548c\u5b8f\u4efb\u52a1<\/strong>\u662f\u4e8b\u4ef6\u5faa\u73af\u4e2d\u7684\u4e24\u7c7b\u4efb\u52a1\u3002\u5b8f\u4efb\u52a1\u901a\u5e38\u5305\u62ec\u811a\u672c\uff08\u6574\u4f53\u4ee3\u7801\uff09\u3001setTimeout\u3001setInterval\u7b49\uff0c\u800c\u5fae\u4efb\u52a1\u5305\u62ecPromise\u3001process.nextTick\uff08Node.js\u73af\u5883\uff09\u7b49\u3002\u6d4f\u89c8\u5668\u5728\u6bcf\u4e2a\u5b8f\u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\u540e\uff0c\u4f1a\u68c0\u67e5\u548c\u6267\u884c\u6240\u6709\u5fae\u4efb\u52a1\u961f\u5217\u4e2d\u7684\u4efb\u52a1\uff0c\u7136\u540e\u6e32\u67d3\u9875\u9762\uff0c\u518d\u6267\u884c\u4e0b\u4e00\u4e2a\u5b8f\u4efb\u52a1\u3002\u901a\u8fc7\u8fd9\u4e00\u673a\u5236\uff0c\u5fae\u4efb\u52a1\u62e5\u6709\u6bd4\u5b8f\u4efb\u52a1\u66f4\u9ad8\u7684\u4f18\u5148\u7ea7\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u7406\u89e3\u4e8b\u4ef6\u5faa\u73af<\/h3>\n<\/p>\n

\u4e8b\u4ef6\u5faa\u73af\u5141\u8bb8JavaScript\u5f15\u64ce\u5728\u6267\u884c\u5f02\u6b65\u4ee3\u7801\u65f6\uff0c\u6301\u7eed\u76d1\u63a7\u8c03\u7528\u6808\u4e0e\u4efb\u52a1\u961f\u5217\u4e4b\u95f4\u7684\u72b6\u6001\u3002\u5f53\u8c03\u7528\u6808\u4e3a\u7a7a\uff0c\u5373\u5f53\u524d\u6267\u884c\u6808\u4e2d\u7684\u6240\u6709\u4ee3\u7801\u6267\u884c\u5b8c\u6bd5\u65f6\uff0c\u4e8b\u4ef6\u5faa\u73af\u4f1a\u67e5\u770b\u4efb\u52a1\u961f\u5217\u4e2d\u662f\u5426\u6709\u7b49\u5f85\u6267\u884c\u7684\u4efb\u52a1\u3002\u5982\u679c\u6709\uff0c\u8fd9\u4e9b\u4efb\u52a1\u4f9d\u6b21\u8fdb\u5165\u8c03\u7528\u6808\u6267\u884c\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u4e0d\u65ad\u5faa\u73af\uff0c\u786e\u4fdd\u4e86\u5f02\u6b65\u4efb\u52a1\u5f97\u4ee5\u5728\u9002\u5f53\u7684\u65f6\u673a\u6267\u884c\u3002<\/p>\n<\/p>\n

\u4e8c\u3001\u5fae\u4efb\u52a1\u4e0e\u5b8f\u4efb\u52a1<\/h3>\n<\/p>\n

\u5fae\u4efb\u52a1\u961f\u5217<\/h4>\n<\/p>\n

\u5fae\u4efb\u52a1\u961f\u5217\u7528\u4e8e\u5904\u7406\u5fae\u4efb\u52a1\uff0c\u5b83\u4eec\u901a\u5e38\u6765\u6e90\u4e8ePromise\u7684resolve\u6216reject\uff0c\u4ee5\u53ca\u5176\u4ed6API\u5982MutationObserver\u3002\u7531\u4e8e\u5fae\u4efb\u52a1\u961f\u5217\u7684\u6267\u884c\u65f6\u673a\u662f\u5728\u6bcf\u4e2a\u5b8f\u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\u540e\u7acb\u5373\u6267\u884c\uff0c\u56e0\u6b64\u5fae\u4efb\u52a1\u53ef\u4ee5\u4fdd\u8bc1\u5728\u5f53\u524d\u5b8f\u4efb\u52a1\u53ca\u5176\u540e\u7eed\u7684\u6e32\u67d3\u64cd\u4f5c\u5b8c\u6210\u540e\u5c3d\u5feb\u6267\u884c\uff0c\u8fd9\u5bf9\u4e8e\u6027\u80fd\u4f18\u5316\u548c\u8d44\u6e90\u5229\u7528\u975e\u5e38\u5173\u952e\u3002<\/p>\n<\/p>\n

\u5b8f\u4efb\u52a1\u961f\u5217<\/h4>\n<\/p>\n

\u5b8f\u4efb\u52a1\u961f\u5217\u8d1f\u8d23\u5904\u7406\u50cfsetTimeout\u3001setInterval\u8fd9\u6837\u7684\u5f02\u6b65\u64cd\u4f5c\u3002\u6d4f\u89c8\u5668\u5bf9\u5b8f\u4efb\u52a1\u7684\u5904\u7406\u662f\uff0c\u6bcf\u6267\u884c\u5b8c\u4e00\u4e2a\u5b8f\u4efb\u52a1\uff0c\u6d4f\u89c8\u5668\u90fd\u4f1a\u68c0\u67e5\u662f\u5426\u9700\u8981\u6e32\u67d3\u66f4\u65b0\u754c\u9762\uff0c\u7136\u540e\u6267\u884c\u5fae\u4efb\u52a1\u961f\u5217\u4e2d\u7684\u6240\u6709\u4efb\u52a1\uff0c\u8fd9\u6837\u4fdd\u8bc1\u4e86\u5fae\u4efb\u52a1\u603b\u662f\u65e9\u4e8e\u4e0b\u4e00\u4e2a\u5b8f\u4efb\u52a1\u6267\u884c\u3002<\/p>\n<\/p>\n

\u4e09\u3001\u6267\u884c\u987a\u5e8f\u63a7\u5236<\/h3>\n<\/p>\n

async\/awAI<\/a>t\u4e0e\u4e8b\u4ef6\u5faa\u73af<\/h4>\n<\/p>\n

async\/await\u662f\u73b0\u4ee3JavaScript\u4e2d\u5904\u7406\u5f02\u6b65\u64cd\u4f5c\u7684\u5f3a\u5927\u5de5\u5177\uff0c\u5b83\u5728\u8bed\u6cd5\u5c42\u9762\u4e0a\u4f7f\u5f02\u6b65\u4ee3\u7801\u770b\u8d77\u6765\u66f4\u50cf\u540c\u6b65\u4ee3\u7801\u3002\u5728\u4f7f\u7528async\/await\u65f6\uff0cawait\u540e\u9762\u7684\u8868\u8fbe\u5f0f\u4f1a\u8fd4\u56de\u4e00\u4e2aPromise\u5bf9\u8c61\u3002\u5982\u679c\u8be5Promise\u5c1a\u672a\u5b8c\u6210\uff0c\u5219\u4ee3\u7801\u4f1a\u6682\u505c\uff08\u4e0d\u963b\u585e\u8c03\u7528\u6808\uff09\uff0c\u76f4\u81f3Promise\u89e3\u51b3\u3002\u8fd9\u610f\u5473\u7740\u5f00\u53d1\u8005\u53ef\u4ee5\u5229\u7528async\/await\u4ee5\u540c\u6b65\u7684\u65b9\u5f0f\u5199\u51fa\u770b\u4f3c\u5f02\u6b65\u7684\u903b\u8f91\uff0c\u4ece\u800c\u66f4\u5bb9\u6613\u5730\u63a7\u5236\u5f02\u6b65\u4efb\u52a1\u7684\u6267\u884c\u987a\u5e8f\u3002<\/p>\n<\/p>\n

Promise\u94fe<\/h4>\n<\/p>\n

Promises\u4e5f\u53ef\u4ee5\u7528\u4e8e\u7cbe\u786e\u63a7\u5236\u5f02\u6b65\u4efb\u52a1\u7684\u6267\u884c\u987a\u5e8f\u3002Promise\u94fe\u5141\u8bb8\u4efb\u52a1\u6309\u7167\u5b9a\u4e49\u7684\u987a\u5e8f\u6267\u884c\uff0c\u5373\u4f7f\u5176\u4e2d\u5305\u542b\u5f02\u6b65\u64cd\u4f5c\u3002\u901a\u8fc7.then()\u65b9\u6cd5\u94fe\u63a5\u591a\u4e2aPromise\uff0c\u53ef\u4ee5\u786e\u4fdd\u524d\u4e00\u4e2aPromise\u89e3\u51b3\u540e\uff0c\u4e0b\u4e00\u4e2aPromise\u624d\u5f00\u59cb\u6267\u884c\u3002\u8fd9\u79cd\u65b9\u5f0f\u975e\u5e38\u9002\u5408\u5904\u7406\u9700\u8981\u987a\u5e8f\u6267\u884c\u7684\u5f02\u6b65\u4efb\u52a1\u3002<\/p>\n<\/p>\n

\u56db\u3001\u4e8b\u4ef6\u5faa\u73af\u4e0e\u9519\u8bef\u5904\u7406<\/h3>\n<\/p>\n

\u5728\u5f02\u6b65\u7f16\u7a0b\u4e2d\uff0c\u6b63\u786e\u5904\u7406\u9519\u8bef\u662f\u81f3\u5173\u91cd\u8981\u7684\u3002\u4f7f\u7528Promise\u548casync\/await\u65f6\uff0c\u53ef\u4ee5\u5229\u7528.catch()\u65b9\u6cd5\u6216try\/catch\u5757\u6765\u6355\u83b7\u548c\u5904\u7406\u9519\u8bef\u3002\u8fd9\u6837\u4e0d\u4ec5\u4fdd\u8bc1\u4e86\u4ee3\u7801\u7684\u5065\u58ee\u6027\uff0c\u4e5f\u907f\u514d\u4e86\u56e0\u672a\u5904\u7406\u9519\u8bef\u800c\u5bfc\u81f4\u7684\u7a0b\u5e8f\u5d29\u6e83\u3002<\/p>\n<\/p>\n

\u4e94\u3001\u5b9e\u8df5\u5e94\u7528<\/h3>\n<\/p>\n

\u5728\u5f00\u53d1\u5b9e\u9645\u5e94\u7528\u65f6\uff0c\u6df1\u5165\u7406\u89e3\u4e8b\u4ef6\u5faa\u73af\u7684\u5de5\u4f5c\u539f\u7406\u5bf9\u4e8e\u4f18\u5316\u5e94\u7528\u6027\u80fd\u3001\u63d0\u5347\u7528\u6237\u4f53\u9a8c\u81f3\u5173\u91cd\u8981\u3002\u4f8b\u5982\uff0c\u901a\u8fc7\u5408\u7406\u5b89\u6392\u5b8f\u4efb\u52a1\u548c\u5fae\u4efb\u52a1\u7684\u6267\u884c\u987a\u5e8f\uff0c\u53ef\u4ee5\u51cf\u5c11\u9875\u9762\u6e32\u67d3\u7684\u5ef6\u8fdf\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u8d44\u6e90\u5f00\u9500\u3002\u6b64\u5916\uff0c\u7406\u89e3\u4e8b\u4ef6\u5faa\u73af\u8fd8\u6709\u52a9\u4e8e\u5f00\u53d1\u8005\u7f16\u5199\u51fa\u66f4\u52a0\u9ad8\u6548\u548c\u6613\u4e8e\u7ef4\u62a4\u7684\u5f02\u6b65\u4ee3\u7801\u3002<\/p>\n<\/p>\n

JavaScript\u7684\u4e8b\u4ef6\u5faa\u73af\u673a\u5236\u662f\u5b9e\u73b0\u9ad8\u6548\u3001\u54cd\u5e94\u5f0f\u5e94\u7528\u7684\u57fa\u77f3\u3002\u901a\u8fc7\u638c\u63e1\u5fae\u4efb\u52a1\u548c\u5b8f\u4efb\u52a1\u7684\u6982\u5ff5\uff0c\u4ee5\u53ca\u5982\u4f55\u901a\u8fc7Promise\u548casync\/await\u63a7\u5236\u5f02\u6b65\u4efb\u52a1\u7684\u6267\u884c\u987a\u5e8f\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u5145\u5206\u5229\u7528JavaScript\u7684\u5f02\u6b65\u7279\u6027\u3002\u5b9e\u9645\u4e0a\uff0c\u6df1\u5165\u7406\u89e3\u4e8b\u4ef6\u5faa\u73af\u80fd\u591f\u5e2e\u52a9\u5f00\u53d1\u8005\u7f16\u5199\u51fa\u66f4\u9ad8\u6548\u3001\u53ef\u7ef4\u62a4\u7684\u4ee3\u7801\uff0c\u4e3a\u7528\u6237\u5e26\u6765\u6d41\u7545\u7684\u5e94\u7528\u4f53\u9a8c\u3002<\/p>\n<\/p>\n

\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n

1. \u5982\u4f55\u5728 JavaScript \u4e2d\u5229\u7528\u4e8b\u4ef6\u5faa\u73af\u673a\u5236\u5904\u7406\u5f02\u6b65\u4efb\u52a1\u7684\u6267\u884c\u987a\u5e8f\uff1f<\/strong>
\n\u5728 JavaScript \u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u4e8b\u4ef6\u5faa\u73af\u673a\u5236\u6765\u5904\u7406\u5f02\u6b65\u4efb\u52a1\u7684\u6267\u884c\u987a\u5e8f\u3002\u4e8b\u4ef6\u5faa\u73af\u662f\u4e00\u4e2a\u5904\u7406\u548c\u5206\u53d1\u5f02\u6b65\u4efb\u52a1\u7684\u673a\u5236\uff0c\u5b83\u4f1a\u6301\u7eed\u8fd0\u884c\u5728\u6267\u884c\u6808\u4e2d\uff0c\u4e0d\u65ad\u5730\u5c06\u4efb\u52a1\u653e\u5165\u5e94\u8be5\u6267\u884c\u7684\u4f4d\u7f6e\u3002<\/p>\n

2. \u4ec0\u4e48\u662f\u4e8b\u4ef6\u5faa\u73af\u673a\u5236\uff0c\u5728 JavaScript \u4e2d\u4e3a\u4ec0\u4e48\u9700\u8981\u5b83\uff1f<\/strong>
\n\u4e8b\u4ef6\u5faa\u73af\u662f JavaScript \u7684\u6267\u884c\u6a21\u578b\uff0c\u5b83\u901a\u8fc7\u5c06\u4efb\u52a1\u6dfb\u52a0\u5230\u6267\u884c\u6808\u4e2d\u6765\u5b9e\u73b0\u5f02\u6b65\u6267\u884c\u3002JavaScript \u662f\u5355\u7ebf\u7a0b\u7684\uff0c\u610f\u5473\u7740\u5b83\u53ea\u80fd\u4e00\u6b21\u5904\u7406\u4e00\u4e2a\u4efb\u52a1\u3002\u4e3a\u4e86\u5904\u7406\u5f02\u6b65\u64cd\u4f5c\uff0c\u5982\u7f51\u7edc\u8bf7\u6c42\u3001\u5b9a\u65f6\u5668\u7b49\uff0c\u4e8b\u4ef6\u5faa\u73af\u673a\u5236\u53ef\u4ee5\u4f7f\u8fd9\u4e9b\u4efb\u52a1\u5728\u9002\u5f53\u7684\u65f6\u5019\u88ab\u6267\u884c\uff0c\u800c\u4e0d\u4f1a\u963b\u585e\u5176\u4ed6\u7684\u4ee3\u7801\u6267\u884c\u3002<\/p>\n

3. JavaScript \u4e2d\u7684\u5b8f\u4efb\u52a1\u548c\u5fae\u4efb\u52a1\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/strong>
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