{"id":90920,"date":"2024-04-09T18:16:28","date_gmt":"2024-04-09T10:16:28","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/90920.html"},"modified":"2024-04-09T18:16:29","modified_gmt":"2024-04-09T10:16:29","slug":"javascript%e5%bc%82%e6%ad%a5%e7%bc%96%e7%a8%8b%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/90920.html","title":{"rendered":"JavaScript\u5f02\u6b65\u7f16\u7a0b\u7684\u57fa\u672c\u6982\u5ff5"},"content":{"rendered":"

\"JavaScript\u5f02\u6b65\u7f16\u7a0b\u7684\u57fa\u672c\u6982\u5ff5\"<\/p>\n

\u5f02\u6b65\u7f16\u7a0b\u662f\u4e00\u79cd\u7f16\u7a0b\u8303\u5f0f\uff0c\u7528\u4e8e\u63d0\u9ad8\u5e94\u7528\u7a0b\u5e8f\u7684\u6548\u7387\u548c\u54cd\u5e94\u6027\u3002\u5728JavaScript\u4e2d\uff0c\u5f02\u6b65\u7f16\u7a0b\u5141\u8bb8\u4ee3\u7801\u7684\u67d0\u4e9b\u90e8\u5206\u72ec\u7acb\u4e8e\u4e3b\u7a0b\u5e8f\u6d41\u7a0b\u8fd0\u884c<\/strong>\uff0c\u907f\u514d\u963b\u585e\u64cd\u4f5c\uff0c\u5982\u6570\u636e\u8bfb\u53d6\u6216API\u8c03\u7528\uff0c\u8fd9\u4f1a\u8017\u8d39\u4e0d\u786e\u5b9a\u7684\u65f6\u95f4\u3002<\/p>\n<\/p>\n

\u8be6\u7ec6\u5730\u8bf4\uff0c\u5f53\u4f60\u53d1\u8d77\u4e00\u4e2a\u4f1a\u82b1\u8d39\u5f88\u591a\u65f6\u95f4\u8fd4\u56de\u7ed3\u679c\u7684\u64cd\u4f5c\u65f6\uff0c\u4f8b\u5982\u8bfb\u53d6\u5927\u6587\u4ef6\u3001\u4e0b\u8f7d\u7f51\u7edc\u8d44\u6e90\u6216\u67e5\u8be2\u6570\u636e\u5e93\uff0c\u4f20\u7edf\u7684\u540c\u6b65\u7f16\u7a0b\u6a21\u578b\u4f1a\u5bfc\u81f4\u7a0b\u5e8f\u505c\u4e0b\u6765\u7b49\u5f85\u64cd\u4f5c\u5b8c\u6210\u3002\u76f8\u53cd\uff0c\u5f02\u6b65\u7f16\u7a0b\u901a\u8fc7\u542f\u52a8\u8fd9\u79cd\u6f5c\u5728\u7684\u957f\u65f6\u95f4\u8fd0\u884c\u64cd\u4f5c\u7684\u540c\u65f6\uff0c\u5141\u8bb8\u6267\u884c\u540e\u7eed\u7684\u4ee3\u7801\uff0c\u800c\u4e0d\u7528\u7b49\u5f85\u5148\u524d\u64cd\u4f5c\u7684\u5b8c\u6210\u3002\u4e00\u65e6\u5f02\u6b65\u64cd\u4f5c\u5b8c\u6210\uff0c\u5b83\u901a\u5e38\u4f1a\u901a\u8fc7\u4e00\u79cd\u673a\u5236\uff08\u5982\u56de\u8c03\u51fd\u6570\u3001\u4e8b\u4ef6\u3001Promise \u5bf9\u8c61\u6216async\/awAI<\/a>t\u8bed\u6cd5\uff09\u901a\u77e5\u7a0b\u5e8f\u7ed3\u679c\u3002<\/p>\n<\/p>\n

\u8fd9\u79cd\u7f16\u7a0b\u8303\u5f0f\u5c24\u5176\u9002\u7528\u4e8eJavaScript\uff0c\u56e0\u4e3aJavaScript\u901a\u5e38\u7528\u4e8e\u5f00\u53d1\u9700\u8981\u9ad8\u5ea6\u54cd\u5e94\u6027\u7684Web\u5e94\u7528\u7a0b\u5e8f\u3002\u901a\u8fc7\u5f02\u6b65\u7f16\u7a0b\uff0c\u5f00\u53d1\u8005\u80fd\u591f\u7f16\u5199\u975e\u963b\u585e\u7684\u3001\u9ad8\u6027\u80fd\u7684\u5e94\u7528\u7a0b\u5e8f\uff0c\u63d0\u5347\u7528\u6237\u4f53\u9a8c\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u5f02\u6b65\u7f16\u7a0b\u7684\u5de5\u4f5c\u673a\u5236<\/p>\n<\/p>\n

JavaScript\u7684\u5f02\u6b65\u7f16\u7a0b\u5de5\u4f5c\u673a\u5236\u57fa\u4e8e\u5176\u5355\u7ebf\u7a0b\u7684\u4e8b\u4ef6\u5faa\u73af\u6a21\u578b\u3002\u5728\u8fd9\u4e2a\u6a21\u578b\u4e2d:<\/p>\n<\/p>\n

1. \u6267\u884c\u6808 (Call Stack):<\/strong> <\/p>\n

\u8fd9\u662f\u4e00\u4e2a\u6570\u636e\u7ed3\u6784\uff0c\u7528\u6765\u8bb0\u5f55\u5f53\u524d\u6267\u884c\u7684\u4ee3\u7801\u5728\u54ea\u4e2a\u4f4d\u7f6e\u3002\u5f53\u51fd\u6570\u6267\u884c\u65f6\uff0c\u5b83\u88ab\u52a0\u5165\u5230\u6267\u884c\u6808\u7684\u9876\u90e8\uff1b\u5f53\u8fd4\u56de\u503c\u65f6\uff0c\u8be5\u51fd\u6570\u4f1a\u4ece\u6808\u4e2d\u5f39\u51fa\u3002<\/p>\n<\/p>\n

2. Web API:<\/strong><\/p>\n

\u7531\u6d4f\u89c8\u5668\u63d0\u4f9b\u7684\u4e00\u7ec4API\uff0c\u5141\u8bb8JavaScript\u8bbf\u95ee\u5f02\u6b65\u64cd\u4f5c\uff0c\u6bd4\u5982\u5b9a\u65f6\u5668\u3001HTTP\u8bf7\u6c42\u6216\u6587\u4ef6\u64cd\u4f5c\u3002<\/p>\n<\/p>\n

3. \u4e8b\u4ef6\u961f\u5217 (Event Queue):<\/strong><\/p>\n

\u5f53\u5f02\u6b65\u64cd\u4f5c\u5b8c\u6210\u65f6\uff0c\u76f8\u5173\u7684\u56de\u8c03\u51fd\u6570\u4f1a\u88ab\u653e\u5165\u4e8b\u4ef6\u961f\u5217\u3002\u5982\u679c\u6267\u884c\u6808\u4e3a\u7a7a\uff0c\u4e8b\u4ef6\u5faa\u73af\u4f1a\u4ece\u4e8b\u4ef6\u961f\u5217\u4e2d\u53d6\u51fa\u56de\u8c03\u51fd\u6570\u5e76\u6267\u884c\u5b83\u3002<\/p>\n<\/p>\n

4. \u4e8b\u4ef6\u5faa\u73af (Event Loop):<\/strong><\/p>\n

\u8d1f\u8d23\u76d1\u542c\u6267\u884c\u6808\u548c\u4e8b\u4ef6\u961f\u5217\u3002\u5982\u679c\u6267\u884c\u6808\u4e3a\u7a7a\uff0c\u5b83\u4f1a\u4ece\u4e8b\u4ef6\u961f\u5217\u4e2d\u53d6\u51fa\u5f85\u5904\u7406\u7684\u56de\u8c03\u51fd\u6570\u3002<\/p>\n<\/p>\n

\u4e8c\u3001\u56de\u8c03\u51fd\u6570\uff08CALLBACKS\uff09<\/p>\n<\/p>\n

\u5f02\u6b65\u7f16\u7a0b\u6700\u539f\u59cb\u7684\u5f62\u5f0f\u662f\u4f7f\u7528\u56de\u8c03\u51fd\u6570\u3002\u56de\u8c03\u662f\u88ab\u4f20\u9012\u5230\u53e6\u4e00\u4e2a\u51fd\u6570\u7684\u53c2\u6570\uff0c\u5e76\u5728\u9002\u5f53\u7684\u65f6\u95f4\u88ab\u8c03\u7528\u4ee5\u5b8c\u6210\u67d0\u4e9b\u7c7b\u578b\u7684\u5f02\u6b65\u5de5\u4f5c\u3002<\/p>\n<\/p>\n

1. \u56de\u8c03\u51fd\u6570\u7684\u5b9a\u4e49:<\/strong> <\/p>\n

\u5f53\u4f60\u4f20\u9012\u4e00\u4e2a\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u7ed9\u53e6\u4e00\u4e2a\u51fd\u6570\u65f6\uff0c\u8fd9\u4e2a\u4f5c\u4e3a\u53c2\u6570\u7684\u51fd\u6570\u5c31\u88ab\u79f0\u4f5c\u56de\u8c03\u51fd\u6570\u3002\u5f02\u6b65API\u901a\u5e38\u8981\u6c42\u4f60\u63d0\u4f9b\u4e00\u4e2a\u56de\u8c03\u51fd\u6570\uff0c\u5f53\u5f02\u6b65\u64cd\u4f5c\u5b8c\u6210\u65f6\u6267\u884c\u3002<\/p>\n<\/p>\n

2. \u56de\u8c03\u5730\u72f1:<\/strong><\/p>\n

\u5f53\u6709\u591a\u4e2a\u56de\u8c03\u51fd\u6570\u76f8\u4e92\u5d4c\u5957\u65f6\uff0c\u4ee3\u7801\u5f88\u5bb9\u6613\u53d8\u5f97\u96be\u4ee5\u7ba1\u7406\u548c\u7ef4\u62a4\u3002\u8fd9\u79cd\u73b0\u8c61\u901a\u5e38\u88ab\u79f0\u4e3a\u201c\u56de\u8c03\u5730\u72f1\u201d\u6216\u201c\u56de\u8c03\u91d1\u5b57\u5854\u201d\uff0c\u56e0\u4e3a\u4ee3\u7801\u5448\u73b0\u51fa\u91d1\u5b57\u5854\u5f0f\u7684\u7ed3\u6784\u3002<\/p>\n<\/p>\n

\u4e09\u3001PROMISES<\/p>\n<\/p>\n

Promises \u662f\u5f02\u6b65\u7f16\u7a0b\u4e2d\u7684\u4e00\u4e2a\u5f3a\u5927\u62bd\u8c61\uff0c\u662f\u5bf9\u672a\u6765\u67d0\u4e2a\u65f6\u523b\u53ef\u80fd\u4f1a\u83b7\u5f97\u7684\u7ed3\u679c\u7684\u4e00\u4e2a\u627f\u8bfa\u3002\u5b83\u4e0d\u4ec5\u8ba9\u5f02\u6b65\u4ee3\u7801\u770b\u8d77\u6765\u66f4\u52a0\u50cf\u540c\u6b65\u4ee3\u7801\uff0c\u800c\u4e14\u63d0\u4f9b\u4e86\u66f4\u597d\u7684\u9519\u8bef\u5904\u7406\u673a\u5236\u3002<\/p>\n<\/p>\n

1. \u521b\u5efaPromises:<\/strong><\/p>\n

\u4e00\u4e2aPromise\u5bf9\u8c61\u4ee3\u8868\u4e86\u4e00\u4e2a\u503c\uff0c\u8fd9\u4e2a\u503c\u53ef\u80fd\u662f\u73b0\u5728\u53ef\u7528\u7684\uff0c\u4e5f\u53ef\u80fd\u662f\u5c06\u6765\u67d0\u4e00\u65f6\u523b\u53ef\u7528\u3002Promise\u53ef\u4ee5\u5904\u4e8e\u4ee5\u4e0b\u4e09\u79cd\u72b6\u6001\u4e4b\u4e00\uff1a\u6302\u8d77\uff08pending\uff09\u3001\u5df2\u5b8c\u6210\uff08fulfilled\uff09\uff0c\u6216\u5df2\u62d2\u7edd\uff08rejected\uff09\u3002<\/p>\n<\/p>\n

2. \u4f7f\u7528Promises:<\/strong><\/p>\n

Promises \u5141\u8bb8\u4f60\u9644\u52a0 .then()<\/code> \u65b9\u6cd5\u94fe\uff0c\u4ee5\u961f\u5217\u65b9\u5f0f\u5904\u7406\u6210\u529f\u7684\u7ed3\u679c\u6216\u5931\u8d25\u7684\u9519\u8bef\u3002\u4f7f\u7528 .catch()<\/code> \u65b9\u6cd5\u53ef\u4ee5\u6355\u83b7\u5e76\u5904\u7406\u524d\u9762\u4efb\u4f55\u6b65\u9aa4\u4e2d\u7684\u9519\u8bef\u3002<\/p>\n<\/p>\n

\u56db\u3001ASYNC\/AWAIT<\/p>\n<\/p>\n

async\/await<\/code> \u662f\u5728ES2017\u6807\u51c6\u4e2d\u5f15\u5165\u7684\uff0c\u5728\u8bed\u6cd5\u4e0a\u4f7f\u5f97\u5f02\u6b65\u64cd\u4f5c\u770b\u8d77\u6765\u548c\u540c\u6b65\u64cd\u4f5c\u66f4\u52a0\u4e00\u81f4\u3002async\/await<\/code> \u57fa\u4e8ePromise\uff0c\u4f46\u63d0\u4f9b\u4e86\u4e00\u79cd\u66f4\u7b80\u5355\u7684\u7f16\u5199\u5f02\u6b65\u4ee3\u7801\u7684\u65b9\u5f0f\u3002<\/p>\n<\/p>\n

1. \u4f7f\u7528async\u5173\u952e\u5b57:<\/strong><\/p>\n

\u901a\u8fc7\u5728\u51fd\u6570\u5b9a\u4e49\u524d\u6dfb\u52a0 async<\/code> \u5173\u952e\u5b57\uff0c\u53ef\u4ee5\u5c06\u4efb\u4f55\u51fd\u6570\u8f6c\u6362\u4e3a\u8fd4\u56dePromise\u5bf9\u8c61\u7684\u5f02\u6b65\u51fd\u6570\u3002<\/p>\n<\/p>\n

2. \u4f7f\u7528await\u5173\u952e\u5b57:<\/strong><\/p>\n

\u5728 async<\/code> \u51fd\u6570\u4e2d\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 await<\/code> \u5173\u952e\u5b57\u6765\u7b49\u5f85\u4e00\u4e2aPromise\u89e3\u51b3\uff08resolve\uff09\uff0c\u5e76\u4e14\u4ee5\u540c\u6b65\u7684\u65b9\u5f0f\u8bfb\u53d6Promise\u7684\u7ed3\u679c\u3002<\/p>\n<\/p>\n

JavaScript\u7684\u5f02\u6b65\u7f16\u7a0b\u662f\u4e00\u4e2a\u5f3a\u5927\u7684\u6a21\u578b\uff0c\u5b83\u5141\u8bb8\u5f00\u53d1\u8005\u7f16\u5199\u9ad8\u6548\u4e14\u54cd\u5e94\u6027\u5f3a\u7684Web\u5e94\u7528\u7a0b\u5e8f\u3002\u901a\u8fc7\u56de\u8c03\u51fd\u6570\u3001Promises\u4ee5\u53ca async\/await<\/code>\uff0cJavaScript\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u9009\u9879\u6765\u5904\u7406\u5f02\u6b65\u64cd\u4f5c\uff0c\u4f7f\u5f97\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u5e76\u6613\u4e8e\u7ef4\u62a4\u3002\u968f\u7740\u8fd9\u4e9b\u6982\u5ff5\u548c\u5e94\u7528\u7a0b\u5e8f\u7684\u590d\u6742\u6027\u4e0d\u65ad\u589e\u957f\uff0c\u638c\u63e1\u8fd9\u4e9b\u5f02\u6b65\u7f16\u7a0b\u6982\u5ff5\u5bf9\u4e8e\u6bcf\u4e2aJavaScript\u5f00\u53d1\u8005\u6765\u8bf4\u90fd\u662f\u81f3\u5173\u91cd\u8981\u7684\u3002<\/p>\n<\/p>\n

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

1. JavaScript\u5f02\u6b65\u7f16\u7a0b\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n

JavaScript\u5f02\u6b65\u7f16\u7a0b\u662f\u4e00\u79cd\u5904\u7406\u5f02\u6b65\u4efb\u52a1\u7684\u7f16\u7a0b\u65b9\u5f0f\u3002\u5b83\u5141\u8bb8\u4ee3\u7801\u5728\u6267\u884c\u67d0\u4e2a\u4efb\u52a1\u65f6\uff0c\u540c\u65f6\u6267\u884c\u5176\u4ed6\u4efb\u52a1\u6216\u54cd\u5e94\u5176\u4ed6\u4e8b\u4ef6\uff0c\u800c\u4e0d\u4f1a\u963b\u585e\u4ee3\u7801\u7684\u6267\u884c\u3002\u8fd9\u79cd\u7f16\u7a0b\u65b9\u5f0f\u975e\u5e38\u9002\u5408\u5904\u7406\u9700\u8981\u4ece\u8fdc\u7a0b\u670d\u52a1\u5668\u83b7\u53d6\u6570\u636e\u3001\u5904\u7406\u5927\u91cf\u8ba1\u7b97\u4efb\u52a1\u6216\u6267\u884c\u8017\u65f6\u64cd\u4f5c\u7684\u573a\u666f\u3002<\/p>\n

2. \u5982\u4f55\u5728JavaScript\u4e2d\u4f7f\u7528\u5f02\u6b65\u7f16\u7a0b\uff1f<\/strong><\/p>\n

\u5728 JavaScript \u4e2d\uff0c\u6709\u591a\u79cd\u65b9\u5f0f\u53ef\u4ee5\u5b9e\u73b0\u5f02\u6b65\u7f16\u7a0b\u3002\u5176\u4e2d\uff0c\u4f7f\u7528\u56de\u8c03\u51fd\u6570\u3001Promise\u4ee5\u53caasync\/await\u662f\u6700\u5e38\u89c1\u7684\u65b9\u6cd5\u3002<\/p>\n

    \n
  • \u4f7f\u7528\u56de\u8c03\u51fd\u6570\uff1a\u5c06\u9700\u8981\u5728\u5f02\u6b65\u4efb\u52a1\u5b8c\u6210\u540e\u6267\u884c\u7684\u4ee3\u7801\u4f5c\u4e3a\u56de\u8c03\u51fd\u6570\u4f20\u9012\u7ed9\u5f02\u6b65\u51fd\u6570\u3002\u5f53\u5f02\u6b65\u4efb\u52a1\u5b8c\u6210\u65f6\uff0c\u89e6\u53d1\u56de\u8c03\u51fd\u6570\u6267\u884c\u3002<\/li>\n
  • \u4f7f\u7528 Promise\uff1aPromise\u662f\u4e00\u79cd\u5904\u7406\u5f02\u6b65\u4efb\u52a1\u7684\u5bf9\u8c61\uff0c\u53ef\u4ee5\u4f7f\u7528Promise\u63d0\u4f9b\u7684\u65b9\u6cd5\u94fe\u5f0f\u8c03\u7528\uff0c\u5e76\u901a\u8fc7then()\u65b9\u6cd5\u83b7\u53d6\u5f02\u6b65\u4efb\u52a1\u7684\u7ed3\u679c\u3002<\/li>\n
  • \u4f7f\u7528async\/await\uff1aasync\/await\u8bed\u6cd5\u662fES8\u4e2d\u65b0\u589e\u7684\u5f02\u6b65\u7f16\u7a0b\u7684\u65b9\u5f0f\uff0c\u5b83\u53ef\u4ee5\u5c06\u5f02\u6b65\u4ee3\u7801\u4ee5\u540c\u6b65\u7684\u65b9\u5f0f\u8868\u8fbe\u51fa\u6765\uff0c\u4f7f\u4ee3\u7801\u7ed3\u6784\u66f4\u52a0\u6e05\u6670\u53ef\u8bfb\u3002<\/li>\n<\/ul>\n

    3. \u5f02\u6b65\u7f16\u7a0b\u6709\u4ec0\u4e48\u4f18\u52bf\uff1f<\/strong><\/p>\n

    \u5f02\u6b65\u7f16\u7a0b\u5177\u6709\u4ee5\u4e0b\u4f18\u52bf\uff1a<\/p>\n

      \n
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