{"id":16678,"date":"2025-01-25T22:51:24","date_gmt":"2025-01-25T19:21:24","guid":{"rendered":"https:\/\/www.itpiran.net\/blog\/?p=16678"},"modified":"2025-01-25T22:51:24","modified_gmt":"2025-01-25T19:21:24","slug":"understanding-the-event-loop-callbacks","status":"publish","type":"post","link":"https:\/\/www.itpiran.net\/blog\/zh\/tutorials\/understanding-the-event-loop-callbacks\/","title":{"rendered":"\u7406\u89e3\u4e8b\u4ef6\u5faa\u73af\u548c\u56de\u8c03"},"content":{"rendered":"

\u4ecb\u7ecd<\/h2>\n

\u5728\u4e92\u8054\u7f51\u65e9\u671f\uff0c\u7f51\u7ad9\u901a\u5e38\u7531HTML\u9875\u9762\u4e0a\u7684\u9759\u6001\u6570\u636e\u6784\u6210\u3002\u4f46\u5982\u4eca\uff0c\u968f\u7740Web\u5e94\u7528\u7a0b\u5e8f\u53d8\u5f97\u66f4\u52a0\u4ea4\u4e92\u5f0f\u548c\u52a8\u6001\uff0c\u6267\u884c\u8bf8\u5982\u5916\u90e8\u7f51\u7edc\u8bf7\u6c42\u4ee5\u83b7\u53d6API\u6570\u636e\u7b49\u5bc6\u96c6\u578b\u64cd\u4f5c\u53d8\u5f97\u8d8a\u6765\u8d8a\u5fc5\u8981\u3002\u8981\u5728JavaScript\u4e2d\u6267\u884c\u8fd9\u4e9b\u64cd\u4f5c\uff0c\u5f00\u53d1\u4eba\u5458\u5fc5\u987b\u4f7f\u7528\u5f02\u6b65\u7f16\u7a0b\u6280\u672f\u3002.<\/p>\n

\u7531\u4e8e JavaScript \u662f\u4e00\u79cd\u5355\u7ebf\u7a0b\u7f16\u7a0b\u8bed\u8a00\uff0c\u91c7\u7528\u5e76\u53d1\u6267\u884c\u6a21\u578b\uff0c\u6309\u987a\u5e8f\u5904\u7406\u64cd\u4f5c\uff0c\u56e0\u6b64\u4e00\u6b21\u53ea\u80fd\u5904\u7406\u4e00\u4e2a\u547d\u4ee4\u3002\u7136\u800c\uff0c\u8bf8\u5982\u4ece API \u8bf7\u6c42\u6570\u636e\u4e4b\u7c7b\u7684\u64cd\u4f5c\u53ef\u80fd\u9700\u8981\u4e0d\u786e\u5b9a\u7684\u65f6\u95f4\uff0c\u5177\u4f53\u53d6\u51b3\u4e8e\u8bf7\u6c42\u6570\u636e\u7684\u5927\u5c0f\u3001\u7f51\u7edc\u8fde\u63a5\u901f\u5ea6\u4ee5\u53ca\u5176\u4ed6\u56e0\u7d20\u3002\u5982\u679c API \u8c03\u7528\u662f\u540c\u6b65\u8fdb\u884c\u7684\uff0c\u90a3\u4e48\u5728 API \u8c03\u7528\u5b8c\u6210\u4e4b\u524d\uff0c\u6d4f\u89c8\u5668\u5c06\u65e0\u6cd5\u5904\u7406\u4efb\u4f55\u7528\u6237\u8f93\u5165\uff0c\u4f8b\u5982\u6eda\u52a8\u6216\u70b9\u51fb\u6309\u94ae\u3002\u8fd9\u88ab\u79f0\u4e3a\u963b\u585e\u3002.<\/p>\n

\u4e3a\u4e86\u907f\u514d\u963b\u585e\u884c\u4e3a\uff0c\u6d4f\u89c8\u5668\u73af\u5883\u63d0\u4f9b\u4e86\u8bb8\u591a\u53ef\u4f9b JavaScript \u8bbf\u95ee\u7684\u5f02\u6b65 Web API\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u4eec\u53ef\u4ee5\u4e0e\u5176\u4ed6\u64cd\u4f5c\u5e76\u884c\u6267\u884c\uff0c\u800c\u4e0d\u662f\u987a\u5e8f\u6267\u884c\u3002\u8fd9\u975e\u5e38\u6709\u7528\uff0c\u56e0\u4e3a\u5b83\u5141\u8bb8\u7528\u6237\u5728\u5f02\u6b65\u64cd\u4f5c\u5904\u7406\u671f\u95f4\u7ee7\u7eed\u6b63\u5e38\u4f7f\u7528\u6d4f\u89c8\u5668\u3002.<\/p>\n

\u4e8b\u4ef6\u5faa\u73af<\/h2>\n

\u672c\u8282\u89e3\u91ca JavaScript \u5982\u4f55\u4f7f\u7528\u4e8b\u4ef6\u5faa\u73af\u5904\u7406\u5f02\u6b65\u4ee3\u7801\u3002\u9996\u5148\uff0c\u901a\u8fc7\u6f14\u793a\u4e8b\u4ef6\u5faa\u73af\u7684\u5de5\u4f5c\u539f\u7406\uff0c\u7136\u540e\u89e3\u91ca\u4e8b\u4ef6\u5faa\u73af\u7684\u4e24\u4e2a\u7ec4\u6210\u90e8\u5206\uff1a\u6808\u548c\u961f\u5217\u3002.<\/p>\n

\u4e0d\u4f7f\u7528\u4efb\u4f55\u5f02\u6b65 Web API \u7684 JavaScript \u4ee3\u7801\u4f1a\u540c\u6b65\u6267\u884c\u2014\u2014\u4e00\u6b21\u6267\u884c\u4e00\u4e2a\uff0c\u6309\u987a\u5e8f\u6267\u884c\u3002\u4ee5\u4e0b\u793a\u4f8b\u4ee3\u7801\u6f14\u793a\u4e86\u8fd9\u4e00\u70b9\uff0c\u5b83\u8c03\u7528\u4e86\u4e09\u4e2a\u51fd\u6570\uff0c\u6bcf\u4e2a\u51fd\u6570\u90fd\u4f1a\u5728\u63a7\u5236\u53f0\u6253\u5370\u4e00\u4e2a\u6570\u5b57\uff1a<\/p>\n

\n
\/\/ Define three example functions\r\nfunction first() {\r\nconsole.log(1)\r\n}\r\n\r\nfunction second() {\r\nconsole.log(2)\r\n}\r\n\r\nfunction third() {\r\nconsole.log(3)\r\n}<\/code><\/pre>\n<\/div>\n
\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u4f60\u5b9a\u4e49\u4e86\u4e09\u4e2a\u4f7f\u7528 console.log() \u6253\u5370\u6570\u5b57\u7684\u51fd\u6570\u3002.<\/p>\n
\u7136\u540e\uff0c\u7f16\u5199\u51fd\u6570\u8c03\u7528\uff1a<\/p>\n
\n
\/\/ Execute the functions\r\nfirst()\r\nsecond()\r\nthird()<\/code><\/pre>\n<\/div>\n
\u8f93\u51fa\u7ed3\u679c\u5c06\u6839\u636e\u51fd\u6570\u7684\u8c03\u7528\u987a\u5e8f\u800c\u5b9a\u2014\u2014\u5148\u8c03\u7528 first()\uff0c\u518d\u8c03\u7528 second()\uff0c\u6700\u540e\u8c03\u7528 three()\uff1a<\/p>\n
\n
Output\r\n1\r\n2\r\n3<\/code><\/pre>\n<\/div>\n
\u4f7f\u7528\u5f02\u6b65 Web API \u65f6\uff0c\u89c4\u5219\u4f1a\u53d8\u5f97\u66f4\u52a0\u590d\u6742\u3002\u60a8\u53ef\u4ee5\u5c1d\u8bd5\u4f7f\u7528\u5185\u7f6e\u7684 `setTimeout` API\uff0c\u5b83\u7528\u4e8e\u8bbe\u7f6e\u4e00\u4e2a\u8ba1\u65f6\u5668\uff0c\u5e76\u5728\u6307\u5b9a\u65f6\u95f4\u540e\u6267\u884c\u64cd\u4f5c\u3002`setTimeout` \u5fc5\u987b\u662f\u5f02\u6b65\u7684\uff0c\u5426\u5219\u5728\u7b49\u5f85\u671f\u95f4\u6574\u4e2a\u6d4f\u89c8\u5668\u90fd\u4f1a\u5361\u6b7b\uff0c\u5bfc\u81f4\u7cdf\u7cd5\u7684\u7528\u6237\u4f53\u9a8c\u3002.<\/p>\n
\u4e3a\u4e86\u6a21\u62df\u5f02\u6b65\u8bf7\u6c42\uff0c\u8bf7\u5728\u7b2c\u4e8c\u4e2a\u51fd\u6570\u4e2d\u6dfb\u52a0 setTimeout\uff1a<\/p>\n
\n
\/\/ Define three example functions, but one of them contains asynchronous code\r\nfunction first() {\r\nconsole.log(1)\r\n}\r\n\r\nfunction second() {\r\nsetTimeout(() => {\r\nconsole.log(2)\r\n}, 0)\r\n}\r\n\r\nfunction third() {\r\nconsole.log(3)\r\n}<\/code><\/pre>\n<\/div>\n
`setTimeout` \u63a5\u53d7\u4e24\u4e2a\u53c2\u6570\uff1a\u4e00\u4e2a\u8981\u5f02\u6b65\u6267\u884c\u7684\u51fd\u6570\uff0c\u4ee5\u53ca\u8c03\u7528\u8be5\u51fd\u6570\u4e4b\u524d\u7b49\u5f85\u7684\u65f6\u95f4\u3002\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u4f60\u5c06 `console.log` \u653e\u5728\u4e00\u4e2a\u533f\u540d\u51fd\u6570\u4e2d\uff0c\u5e76\u5c06\u5176\u4f20\u9012\u7ed9 `setTimeout`\uff0c\u7136\u540e\u5c06\u8be5\u51fd\u6570\u7684\u6267\u884c\u65f6\u95f4\u8bbe\u7f6e\u4e3a 0 \u6beb\u79d2\u3002.<\/p>\n
\u73b0\u5728\u50cf\u4e4b\u524d\u4e00\u6837\u8c03\u7528\u8fd9\u4e9b\u51fd\u6570\uff1a<\/p>\n
\n
\/\/ Execute the functions\r\nfirst()\r\nsecond()\r\nthird()<\/code><\/pre>\n<\/div>\n
\u4f60\u53ef\u80fd\u4f1a\u8ba4\u4e3a\uff0c\u5c06 setTimeout \u8bbe\u7f6e\u4e3a 0 \u540e\uff0c\u6267\u884c\u8fd9\u4e09\u4e2a\u51fd\u6570\u4ecd\u7136\u4f1a\u6309\u987a\u5e8f\u6253\u5370\u6570\u5b57\u3002\u4f46\u7531\u4e8e\u5b83\u662f\u5f02\u6b65\u7684\uff0c\u51fd\u6570\u4f1a\u5728\u6253\u5370\u6700\u540e\u4e00\u4e2a\u6570\u5b57\u65f6\u4e2d\u65ad\uff1a<\/p>\n
\n
Output\r\n1\r\n3\r\n2<\/code><\/pre>\n<\/div>\n
\u65e0\u8bba\u4f60\u5c06\u8ba1\u65f6\u5668\u8bbe\u7f6e\u4e3a\u96f6\u79d2\u8fd8\u662f\u4e94\u5206\u949f\uff0c\u5f02\u6b65\u4ee3\u7801\u8c03\u7528\u7684 `console.log` \u51fd\u6570\u90fd\u4f1a\u5728\u9876\u5c42\u540c\u6b65\u51fd\u6570\u6267\u884c\u5b8c\u6bd5\u540e\u8fd0\u884c\u3002\u8fd9\u662f\u56e0\u4e3a JavaScript \u5bbf\u4e3b\u73af\u5883\uff08\u5728\u672c\u4f8b\u4e2d\u4e3a\u6d4f\u89c8\u5668\uff09\u4f7f\u7528\u4e86\u4e00\u79cd\u79f0\u4e3a\u4e8b\u4ef6\u5faa\u73af\u7684\u6982\u5ff5\u6765\u5904\u7406\u5e76\u53d1\u6216\u5e76\u884c\u4e8b\u4ef6\u3002\u7531\u4e8e JavaScript \u4e00\u6b21\u53ea\u80fd\u6267\u884c\u4e00\u4e2a\u547d\u4ee4\uff0c\u56e0\u6b64\u5b83\u9700\u8981\u4e8b\u4ef6\u5faa\u73af\u6765\u77e5\u9053\u4f55\u65f6\u6267\u884c\u67d0\u4e2a\u7279\u5b9a\u7684\u547d\u4ee4\u3002\u4e8b\u4ef6\u5faa\u73af\u5229\u7528\u6808\u548c\u961f\u5217\u7684\u6982\u5ff5\u6765\u5904\u7406\u8fd9\u79cd\u60c5\u51b5\u3002.<\/p>\n
\u5806<\/h5>\n
\u6808\uff0c\u4e5f\u79f0\u4e3a\u8c03\u7528\u6808\uff0c\u4fdd\u5b58\u7740\u5f53\u524d\u6b63\u5728\u6267\u884c\u7684\u51fd\u6570\u7684\u72b6\u6001\u3002\u5982\u679c\u60a8\u4e0d\u719f\u6089\u6808\u7684\u6982\u5ff5\uff0c\u53ef\u4ee5\u5c06\u5176\u60f3\u8c61\u6210\u4e00\u4e2a\u5177\u6709\u00ab\u540e\u8fdb\u5148\u51fa\u00bb\uff08LIFO\uff09\u7279\u6027\u7684\u6570\u7ec4\uff0c\u8fd9\u610f\u5473\u7740\u60a8\u53ea\u80fd\u4ece\u6808\u5e95\u6dfb\u52a0\u6216\u5220\u9664\u5143\u7d20\u3002JavaScript \u4f1a\u6267\u884c\u6808\u4e0a\u7684\u5f53\u524d\u5e27\uff08\u6216\u7279\u5b9a\u73af\u5883\u4e0b\u7684\u51fd\u6570\u8c03\u7528\uff09\uff0c\u7136\u540e\u5c06\u5176\u79fb\u9664\u5e76\u7ee7\u7eed\u6267\u884c\u4e0b\u4e00\u5e27\u3002.<\/p>\n
\u4f8b\u5982\uff0c\u5982\u679c\u4ee3\u7801\u4ec5\u5305\u542b\u540c\u6b65\u4ee3\u7801\uff0c\u5219\u6d4f\u89c8\u5668\u6309\u4ee5\u4e0b\u987a\u5e8f\u6267\u884c\uff1a<\/p>\n
    \n
  • \u7b2c\u4e00\u7684\uff08\uff09<\/strong> \u5c06 first() \u6dfb\u52a0\u5230\u5806\u6808\u4e2d\uff0c\u6267\u884c first()\uff0c\u8be5\u51fd\u6570\u4f1a\u5411\u63a7\u5236\u53f0\u8f93\u51fa 1\uff0c\u7136\u540e\u4ece\u5806\u6808\u4e2d\u79fb\u9664 first()\u3002.<\/li>\n
  • \u7b2c\u4e8c\uff08\uff09<\/strong> \u5c06 second() \u6dfb\u52a0\u5230\u6808\u4e2d\uff0c\u6267\u884c second()\uff0c\u8be5\u51fd\u6570\u4f1a\u5728\u63a7\u5236\u53f0\u6253\u5370 2\uff0c\u7136\u540e\u4ece\u6808\u4e2d\u79fb\u9664 second()\u3002.<\/li>\n
  • \u7b2c\u4e09 \uff08\uff09<\/strong> \u5c06 third() \u6dfb\u52a0\u5230\u5806\u6808\u4e2d\uff0c\u6267\u884c third()\uff0c\u8be5\u51fd\u6570\u4f1a\u5c06 3 \u8f93\u51fa\u5230\u63a7\u5236\u53f0\uff0c\u7136\u540e\u4ece\u5806\u6808\u4e2d\u79fb\u9664 third()\u3002.<\/li>\n<\/ul>\n
    \u7b2c\u4e8c\u4e2a\u4f7f\u7528 setTimeout \u7684\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n
      \n
    • \u7b2c\u4e00\u7684\uff08\uff09<\/strong> \u5c06 first() \u6dfb\u52a0\u5230\u5806\u6808\u4e2d\uff0c\u6267\u884c first()\uff0c\u8be5\u51fd\u6570\u4f1a\u5411\u63a7\u5236\u53f0\u8f93\u51fa 1\uff0c\u7136\u540e\u4ece\u5806\u6808\u4e2d\u79fb\u9664 first()\u3002.<\/li>\n
    • \u7b2c\u4e8c\uff08\uff09<\/strong> \u5c06\u5185\u5bb9\u6dfb\u52a0\u5230\u5806\u6808\u4e2d\uff0c\u6267\u884c second()\u3002.\n
        \n
      • \u5c06 setTimeout() \u6dfb\u52a0\u5230\u5806\u6808\u4e2d\uff0c\u6267\u884c Web API setTimeout()\uff0c\u8be5\u51fd\u6570\u4f1a\u542f\u52a8\u8ba1\u65f6\u5668\u5e76\u5c06\u533f\u540d\u51fd\u6570\u6dfb\u52a0\u5230\u961f\u5217\u4e2d\uff0c\u7136\u540e\u4ece\u5806\u6808\u4e2d\u79fb\u9664 setTimeout()\u3002.<\/li>\n<\/ul>\n<\/li>\n
      • \u7b2c\u4e8c\uff08\uff09<\/strong> \u4ece\u5806\u6808\u4e2d\u79fb\u9664\u3002.<\/li>\n
      • \u7b2c\u4e09 \uff08\uff09<\/strong> \u5c06 third() \u6dfb\u52a0\u5230\u5806\u6808\u4e2d\uff0c\u6267\u884c third()\uff0c\u8be5\u51fd\u6570\u4f1a\u5c06 3 \u8f93\u51fa\u5230\u63a7\u5236\u53f0\uff0c\u7136\u540e\u4ece\u5806\u6808\u4e2d\u79fb\u9664 third()\u3002.<\/li>\n
      • \u4e8b\u4ef6\u5faa\u73af\u68c0\u67e5\u961f\u5217\u4e2d\u662f\u5426\u6709\u5f85\u5904\u7406\u7684\u6d88\u606f\uff0c\u627e\u5230 setTimeout() \u4e2d\u7684\u533f\u540d\u51fd\u6570\uff0c\u5c06\u8be5\u51fd\u6570\u6dfb\u52a0\u5230\u5806\u6808\u4e2d\uff0c\u8be5\u51fd\u6570\u4f1a\u5411\u63a7\u5236\u53f0\u8f93\u51fa 2\uff0c\u7136\u540e\u5c06\u5176\u4ece\u5806\u6808\u4e2d\u79fb\u9664\u3002.<\/li>\n<\/ul>\n
        \u4f7f\u7528 setTimeout\uff0c\u5f02\u6b65 Web API \u5f15\u5165\u4e86\u961f\u5217\u7684\u6982\u5ff5\uff0c\u672c\u6559\u7a0b\u7a0d\u540e\u5c06\u5bf9\u6b64\u8fdb\u884c\u4ecb\u7ecd\u3002.<\/p>\n
        \u961f\u5217<\/h5>\n
        \u961f\u5217\uff0c\u4e5f\u79f0\u4e3a\u6d88\u606f\u961f\u5217\u6216\u4efb\u52a1\u961f\u5217\uff0c\u662f\u51fd\u6570\u7b49\u5f85\u7684\u533a\u57df\u3002\u5f53\u8c03\u7528\u6808\u4e3a\u7a7a\u65f6\uff0c\u4e8b\u4ef6\u5faa\u73af\u4f1a\u68c0\u67e5\u961f\u5217\u4e2d\u662f\u5426\u6709\u5f85\u5904\u7406\u7684\u6d88\u606f\uff0c\u4ece\u6700\u65e9\u7684\u6d88\u606f\u5f00\u59cb\u68c0\u67e5\u3002\u627e\u5230\u6d88\u606f\u540e\uff0c\u5c06\u5176\u6dfb\u52a0\u5230\u8c03\u7528\u6808\u4e2d\uff0c\u8c03\u7528\u6808\u4f1a\u6267\u884c\u6d88\u606f\u4e2d\u5305\u542b\u7684\u51fd\u6570\u3002.<\/p>\n
        \u5728 `setTimeout` \u793a\u4f8b\u4e2d\uff0c\u533f\u540d\u51fd\u6570\u4f1a\u5728\u9876\u5c42\u4ee3\u7801\u6267\u884c\u5b8c\u6bd5\u540e\u7acb\u5373\u6267\u884c\uff0c\u56e0\u4e3a\u5b9a\u65f6\u5668\u8bbe\u7f6e\u4e3a 0 \u79d2\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5b9a\u65f6\u5668\u5e76\u975e\u6307\u4ee3\u7801\u4f1a\u5728 0 \u79d2\u6216\u4efb\u4f55\u7279\u5b9a\u65f6\u95f4\u6267\u884c\uff0c\u800c\u662f\u6307\u5b83\u4f1a\u5728\u5b9a\u65f6\u5668\u8bbe\u5b9a\u7684\u65f6\u95f4\u5185\u5c06\u533f\u540d\u51fd\u6570\u6dfb\u52a0\u5230\u961f\u5217\u4e2d\u3002\u4e4b\u6240\u4ee5\u9700\u8981\u8fd9\u79cd\u961f\u5217\u673a\u5236\uff0c\u662f\u56e0\u4e3a\u5982\u679c\u5b9a\u65f6\u5668\u5728\u8d85\u65f6\u540e\u76f4\u63a5\u5c06\u533f\u540d\u51fd\u6570\u6dfb\u52a0\u5230\u5806\u6808\uff0c\u5c06\u4f1a\u4e2d\u65ad\u5f53\u524d\u6b63\u5728\u6267\u884c\u7684\u51fd\u6570\uff0c\u8fd9\u53ef\u80fd\u4f1a\u4ea7\u751f\u610f\u60f3\u4e0d\u5230\u7684\u540e\u679c\u3002.<\/p>\n
        \u6ce8\u610f\uff1a\u8fd8\u6709\u4e00\u4e2a\u540d\u4e3a\u4f5c\u4e1a\u961f\u5217\u6216\u5fae\u4efb\u52a1\u961f\u5217\u7684\u961f\u5217\uff0c\u4e13\u95e8\u7528\u4e8e\u5904\u7406 Promise\u3002\u50cf Promise \u8fd9\u6837\u7684\u5fae\u4efb\u52a1\u6bd4\u50cf setTimeout \u8fd9\u6837\u7684\u5b8f\u4efb\u52a1\u5177\u6709\u66f4\u9ad8\u7684\u6267\u884c\u4f18\u5148\u7ea7\u3002.<\/span><\/p>\n
        \u65e2\u7136\u4f60\u5df2\u7ecf\u4e86\u89e3\u4e86\u4e8b\u4ef6\u5faa\u73af\u5982\u4f55\u4f7f\u7528\u6808\u548c\u961f\u5217\u6765\u5904\u7406\u4ee3\u7801\u6267\u884c\u987a\u5e8f\uff0c\u90a3\u4e48\u4e0b\u4e00\u6b65\u5c31\u662f\u5f04\u6e05\u695a\u5982\u4f55\u63a7\u5236\u4ee3\u7801\u4e2d\u7684\u6267\u884c\u987a\u5e8f\u3002\u4e3a\u6b64\uff0c\u4f60\u9996\u5148\u8981\u5b66\u4e60\u786e\u4fdd\u4e8b\u4ef6\u5faa\u73af\u6b63\u786e\u5904\u7406\u5f02\u6b65\u4ee3\u7801\u7684\u4e3b\u8981\u65b9\u6cd5\uff1a\u56de\u8c03\u51fd\u6570\u3002.<\/span><\/p>\n
        \u56de\u8c03\u51fd\u6570<\/h2>\n
        \u5728 `setTimeout` \u793a\u4f8b\u4e2d\uff0c\u5e26\u6709\u8d85\u65f6\u8bbe\u7f6e\u7684\u51fd\u6570\u4f1a\u5728\u9876\u5c42\u6267\u884c\u7684\u4e3b\u4e0a\u4e0b\u6587\u4e2d\u6240\u6709\u64cd\u4f5c\u5b8c\u6210\u540e\u6267\u884c\u3002\u4f46\u662f\uff0c\u5982\u679c\u60a8\u5e0c\u671b\u786e\u4fdd\u67d0\u4e2a\u51fd\u6570\uff08\u4f8b\u5982\u7b2c\u4e09\u4e2a\u51fd\u6570\uff09\u5728\u8d85\u65f6\u540e\u6267\u884c\uff0c\u5219\u9700\u8981\u4f7f\u7528\u5f02\u6b65\u7f16\u7801\u6280\u672f\u3002\u8fd9\u91cc\u7684\u8d85\u65f6\u53ef\u4ee5\u4ee3\u8868\u4e00\u4e2a\u5305\u542b\u6570\u636e\u7684\u5f02\u6b65 API \u8c03\u7528\u3002\u60a8\u5e0c\u671b\u5904\u7406\u6765\u81ea API \u8c03\u7528\u7684\u6570\u636e\uff0c\u4f46\u9996\u5148\u9700\u8981\u786e\u4fdd\u6570\u636e\u5df2\u8fd4\u56de\u3002.<\/p>\n
        \u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u4e3b\u8981\u65b9\u6cd5\u662f\u4f7f\u7528\u56de\u8c03\u51fd\u6570\u3002\u56de\u8c03\u51fd\u6570\u6ca1\u6709\u7279\u6b8a\u7684\u8bed\u6cd5\uff0c\u5b83\u672c\u8d28\u4e0a\u5c31\u662f\u4e00\u4e2a\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u53e6\u4e00\u4e2a\u51fd\u6570\u7684\u51fd\u6570\u3002\u63a5\u53d7\u53e6\u4e00\u4e2a\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u7684\u51fd\u6570\u88ab\u79f0\u4e3a\u9ad8\u9636\u51fd\u6570\u3002\u6839\u636e\u8fd9\u4e2a\u5b9a\u4e49\uff0c\u4efb\u4f55\u51fd\u6570\u53ea\u8981\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\uff0c\u5c31\u53ef\u4ee5\u6210\u4e3a\u88ab\u8c03\u7528\u51fd\u6570\u3002\u7535\u8bdd\u901a\u8bdd\u672c\u8eab\u5e76\u975e\u5f02\u6b65\u7684\uff0c\u4f46\u53ef\u4ee5\u7528\u4e8e\u5f02\u6b65\u76ee\u7684\u3002.<\/p>\n
        \u4ee5\u4e0b\u662f\u4e00\u4e2a\u9ad8\u9636\u51fd\u6570\u548c\u56de\u8c03\u51fd\u6570\u7684\u8bed\u6cd5\u4ee3\u7801\u793a\u4f8b\uff1a<\/p>\n
        \n
        \/\/ A function\r\nfunction fn() {\r\nconsole.log('Just a function')\r\n}\r\n\r\n\/\/ A function that takes another function as an argument\r\nfunction higherOrderFunction(callback) {\r\n\/\/ When you call a function that is passed as an argument, it is referred to as a callback\r\ncallback()\r\n}\r\n\r\n\/\/ Passing a function\r\nhigherOrderFunction(fn)<\/code><\/pre>\n<\/div>\n
        \u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u4f60\u5b9a\u4e49\u4e86\u4e00\u4e2a\u51fd\u6570 fn\uff0c\u5b9a\u4e49\u4e86\u4e00\u4e2a\u63a5\u53d7\u56de\u8c03\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u7684\u51fd\u6570 aboveOrderFunction\uff0c\u5e76\u5c06 fn \u4f5c\u4e3a\u56de\u8c03\u4f20\u9012\u7ed9 aboveOrderFunction\u3002.<\/p>\n
        \u8fd0\u884c\u6b64\u4ee3\u7801\u5c06\u5b9e\u73b0\u4ee5\u4e0b\u76ee\u6807\uff1a<\/p>\n
        \n
        Output\r\nJust a function<\/code><\/pre>\n<\/div>\n
        \u8ba9\u6211\u4eec\u56de\u5230\u7b2c\u4e00\u4e2a\u3001\u7b2c\u4e8c\u4e2a\u548c\u7b2c\u4e09\u4e2a\u5e26\u6709 setTimeout \u7684\u51fd\u6570\u3002\u4ee5\u4e0b\u662f\u76ee\u524d\u4e3a\u6b62\u7684\u4ee3\u7801\uff1a<\/p>\n
        \n
        function first() {\r\nconsole.log(1)\r\n}\r\n\r\nfunction second() {\r\nsetTimeout(() => {\r\nconsole.log(2)\r\n}, 0)\r\n}\r\n\r\nfunction third() {\r\nconsole.log(3)\r\n}<\/code><\/pre>\n<\/div>\n
        \u4efb\u52a1\u662f\u8ba9\u7b2c\u4e09\u4e2a\u51fd\u6570\u59cb\u7ec8\u5ef6\u8fdf\u6267\u884c\uff0c\u76f4\u5230\u7b2c\u4e8c\u4e2a\u51fd\u6570\u4e2d\u7684\u5f02\u6b65\u64cd\u4f5c\u5b8c\u6210\u3002\u8fd9\u5c31\u9700\u8981\u7528\u5230\u56de\u8c03\u51fd\u6570\u3002\u4e0e\u5176\u5728\u6267\u884c\u5c42\u7ea7\u6700\u9ad8\u65f6\u540c\u65f6\u6267\u884c\u7b2c\u4e00\u4e2a\u3001\u7b2c\u4e8c\u4e2a\u548c\u7b2c\u4e09\u4e2a\u51fd\u6570\uff0c\u4e0d\u5982\u5c06\u7b2c\u4e09\u4e2a\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u7b2c\u4e8c\u4e2a\u51fd\u6570\u3002\u7b2c\u4e8c\u4e2a\u51fd\u6570\u4f1a\u5728\u5f02\u6b65\u64cd\u4f5c\u5b8c\u6210\u540e\u6267\u884c\u56de\u8c03\u51fd\u6570\u3002.<\/p>\n
        \u4ee5\u4e0b\u662f\u4e09\u4e2a\u4f7f\u7528\u56de\u8c03\u51fd\u6570\u5b9e\u73b0\u7684\u51fd\u6570\uff1a<\/p>\n
        \n
        \/\/ Define three functions\r\nfunction first() {\r\nconsole.log(1)\r\n}\r\n\r\nfunction second(callback) {\r\nsetTimeout(() => {\r\nconsole.log(2)\r\n\r\n\/\/ Execute the callback function\r\ncallback()\r\n}, 0)\r\n}\r\n\r\nfunction third() {\r\nconsole.log(3)\r\n}<\/code><\/pre>\n<\/div>\n
        \u73b0\u5728\u6267\u884c\u7b2c\u4e00\u4e2a\u548c\u7b2c\u4e8c\u4e2a\u6b65\u9aa4\uff0c\u7136\u540e\u5c06\u7b2c\u4e09\u4e2a\u6b65\u9aa4\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u7b2c\u4e8c\u4e2a\u6b65\u9aa4\uff1a<\/p>\n
        \n
        first()\r\nsecond(third)<\/code><\/pre>\n<\/div>\n
        \u6267\u884c\u6b64\u4ee3\u7801\u5757\u540e\uff0c\u60a8\u5c06\u5f97\u5230\u4ee5\u4e0b\u8f93\u51fa\uff1a<\/p>\n
        \n
        Output\r\n1\r\n2\r\n3<\/code><\/pre>\n<\/div>\n
        \u9996\u5148\u6253\u5370 1\uff0c\u7136\u540e\u8ba1\u65f6\u5668\u5230\u671f\u540e\uff08\u672c\u4f8b\u4e2d\u4e3a\u96f6\u79d2\uff0c\u4f46\u60a8\u53ef\u4ee5\u5c06\u5176\u66f4\u6539\u4e3a\u4efb\u4f55\u503c\uff09\uff0c\u6253\u5370 2\uff0c\u7136\u540e\u6253\u5370 3\u3002\u4e00\u76f4\u8fd0\u884c\u76f4\u5230\u5f02\u6b65 Web API (setTimeout) \u5b8c\u6210\u3002.<\/p>\n
        \u5173\u952e\u5728\u4e8e\u56de\u8c03\u51fd\u6570\u5e76\u975e\u5f02\u6b65\u7684\u2014\u2014setTimeout \u662f\u4e00\u4e2a\u5f02\u6b65 Web API\uff0c\u8d1f\u8d23\u5904\u7406\u5f02\u6b65\u4efb\u52a1\u3002\u56de\u8c03\u51fd\u6570\u4ec5\u5141\u8bb8\u4f60\u5728\u5f02\u6b65\u4efb\u52a1\u5b8c\u6210\u65f6\u6536\u5230\u901a\u77e5\uff0c\u5e76\u5904\u7406\u8be5\u4efb\u52a1\u7684\u6210\u529f\u6216\u5931\u8d25\u3002.<\/p>\n
        \u65e2\u7136\u4f60\u5df2\u7ecf\u5b66\u4f1a\u4e86\u5982\u4f55\u4f7f\u7528\u56de\u8c03\u6765\u6267\u884c\u5f02\u6b65\u4efb\u52a1\uff0c\u4e0b\u4e00\u8282\u5c06\u89e3\u91ca\u5d4c\u5957\u8fc7\u591a\u8c03\u7528\u5e76\u521b\u5efa\u201c\u5384\u8fd0\u91d1\u5b57\u5854\u201d\u6240\u5e26\u6765\u7684\u95ee\u9898\u3002.<\/p>\n
        \u5d4c\u5957\u56de\u8c03\u548c\u672b\u65e5\u91d1\u5b57\u5854<\/h2>\n
        \u56de\u8c03\u51fd\u6570\u662f\u4e00\u79cd\u6709\u6548\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u786e\u4fdd\u4e00\u4e2a\u51fd\u6570\u5ef6\u8fdf\u6267\u884c\uff0c\u76f4\u5230\u53e6\u4e00\u4e2a\u51fd\u6570\u5b8c\u6210\u5e76\u8fd4\u56de\u6570\u636e\u3002\u7136\u800c\uff0c\u7531\u4e8e\u56de\u8c03\u51fd\u6570\u7684\u5d4c\u5957\u7279\u6027\uff0c\u5982\u679c\u5b58\u5728\u8bb8\u591a\u76f8\u4e92\u4f9d\u8d56\u7684\u8fde\u7eed\u5f02\u6b65\u8bf7\u6c42\uff0c\u4ee3\u7801\u5c31\u4f1a\u53d8\u5f97\u975e\u5e38\u6df7\u4e71\u3002\u8fd9\u66fe\u662f\u65e9\u671f JavaScript \u5f00\u53d1\u8005\u7684\u4e00\u5927\u75db\u70b9\uff0c\u56e0\u6b64\uff0c\u5305\u542b\u5d4c\u5957\u8c03\u7528\u7684\u4ee3\u7801\u901a\u5e38\u88ab\u79f0\u4e3a\u201c\u6298\u78e8\u91d1\u5b57\u5854\u201d\u6216\u201c\u56de\u8c03\u5730\u72f1\u201d\u3002.<\/p>\n
        \u4ee5\u4e0b\u662f\u5d4c\u5957\u56de\u8c03\u51fd\u6570\u7684\u6f14\u793a\uff1a<\/p>\n
        \n
        function pyramidOfDoom() {\r\nsetTimeout(() => {\r\nconsole.log(1)\r\nsetTimeout(() => {\r\nconsole.log(2)\r\nsetTimeout(() => {\r\nconsole.log(3)\r\n}, 500)\r\n}, 2000)\r\n}, 1000)\r\n}<\/code><\/pre>\n<\/div>\n
        \u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u6bcf\u4e2a\u65b0\u7684 setTimeout \u8c03\u7528\u90fd\u88ab\u653e\u7f6e\u5728\u4e00\u4e2a\u9ad8\u9636\u51fd\u6570\u5185\u90e8\uff0c\u4ece\u800c\u5f62\u6210\u4e00\u4e2a\u5c42\u5c42\u9012\u8fdb\u7684\u8c03\u7528\u91d1\u5b57\u5854\u3002\u8fd0\u884c\u8fd9\u6bb5\u4ee3\u7801\u5c06\u4ea7\u751f\u4ee5\u4e0b\u7ed3\u679c\uff1a<\/p>\n
        \n
        Output\r\n1\r\n2\r\n3<\/code><\/pre>\n<\/div>\n
        \u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u5bf9\u4e8e\u771f\u6b63\u7684\u5f02\u6b65\u4ee3\u7801\uff0c\u60c5\u51b5\u4f1a\u53d8\u5f97\u590d\u6742\u5f97\u591a\u3002\u4f60\u53ef\u80fd\u9700\u8981\u5904\u7406\u5f02\u6b65\u4ee3\u7801\u4e2d\u7684\u9519\u8bef\uff0c\u5e76\u5c06\u6bcf\u4e2a\u54cd\u5e94\u4e2d\u7684\u4e00\u4e9b\u6570\u636e\u4f20\u9012\u7ed9\u4e0b\u4e00\u4e2a\u8bf7\u6c42\u3002\u4f7f\u7528\u56de\u8c03\u51fd\u6570\u6765\u5b9e\u73b0\u8fd9\u4e00\u70b9\u4f1a\u4f7f\u4f60\u7684\u4ee3\u7801\u66f4\u96be\u9605\u8bfb\u548c\u7ef4\u62a4\u3002.<\/p>\n
        \u8fd9\u91cc\u6709\u4e00\u4e2a\u66f4\u8d34\u8fd1\u73b0\u5b9e\u7684\u201c\u6b7b\u4ea1\u91d1\u5b57\u5854\u201d\u7684\u53ef\u64cd\u4f5c\u793a\u4f8b\uff0c\u4f60\u53ef\u4ee5\u5c1d\u8bd5\u4e00\u4e0b\uff1a<\/p>\n
        \n
        \/\/ Example asynchronous function\r\nfunction asynchronousRequest(args, callback) {\r\n\/\/ Throw an error if no arguments are passed\r\nif (!args) {\r\nreturn callback(new Error('Whoa! Something went wrong.'))\r\n} else {\r\nreturn setTimeout(\r\n\/\/ Just adding in a random number so it seems like the contrived asynchronous function\r\n\/\/ returned different data\r\n() => callback(null, {body: args + ' ' + Math.floor(Math.random() * 10)}),\r\n500,\r\n)\r\n}\r\n}\r\n\/\/ Nested asynchronous requests\r\nfunction callbackHell() {\r\nasynchronousRequest('First', function first(error, response) {\r\nif (error) {\r\nconsole.log(error)\r\nreturn\r\n}\r\nconsole.log(response.body)\r\nasynchronousRequest('Second', function second(error, response) {\r\nif (error) {\r\nconsole.log(error)\r\nreturn\r\n}\r\nconsole.log(response.body)\r\nasynchronousRequest(null, function third(error, response) {\r\nif (error) {\r\nconsole.log(error)\r\nreturn\r\n}\r\nconsole.log(response.body)\r\n})\r\n})\r\n})\r\n}\r\n\/\/ Execute \r\ncallbackHell()<\/code><\/pre>\n<\/div>\n
        \u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u4f60\u5fc5\u987b\u8003\u8651\u6bcf\u4e2a\u51fd\u6570\u53ef\u80fd\u51fa\u73b0\u7684\u54cd\u5e94\u548c\u53ef\u80fd\u51fa\u73b0\u7684\u9519\u8bef\uff0c\u8fd9\u4f7f\u5f97 callbackHell \u51fd\u6570\u5728\u89c6\u89c9\u4e0a\u4ee4\u4eba\u56f0\u60d1\u3002.<\/p>\n
        \u8fd0\u884c\u8fd9\u6bb5\u4ee3\u7801\u5c06\u5f97\u5230\u4ee5\u4e0b\u7ed3\u679c\uff1a<\/p>\n
        \n
        Output\r\nFirst 9\r\nSecond 3\r\nError: Whoa! Something went wrong.\r\nat asynchronousRequest (<anonymous>:4:21)\r\nat second (<anonymous>:29:7)\r\nat <anonymous>:9:13<\/code><\/pre>\n<\/div>\n
        \u7ed3\u679c<\/h2>\n
        \u8fd9\u79cd\u7ba1\u7406\u5f02\u6b65\u4ee3\u7801\u7684\u65b9\u6cd5\u6bd4\u8f83\u590d\u6742\u3002\u56e0\u6b64\uff0cES6 \u5f15\u5165\u4e86 Promise \u7684\u6982\u5ff5\u3002\u4e0b\u4e00\u8282\u5c06\u91cd\u70b9\u4ecb\u7ecd Promise\u3002.<\/p>","protected":false},"excerpt":{"rendered":"\u5f15\u8a00 \u5728\u4e92\u8054\u7f51\u65e9\u671f\uff0c\u7f51\u7ad9\u901a\u5e38\u7531HTML\u9875\u9762\u4e0a\u7684\u9759\u6001\u6570\u636e\u7ec4\u6210\u2026\u2026","protected":false},"author":1,"featured_media":16684,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"\u062d\u0644\u0642\u0647 \u0631\u0648\u06cc\u062f\u0627\u062f \u0648 callbacks","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_yoast_wpseo_canonical":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_opengraph-image":"","_yoast_wpseo_twitter-description":"","_yoast_wpseo_twitter-image":"","_yoast_wpseo_focuskeywords":"[]","_yoast_wpseo_primary_category":"193","footnotes":""},"categories":[193,363],"tags":[384],"class_list":{"0":"post-16678","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-tutorials","8":"category-programming","9":"tag-java-script"},"yoast_head":"\n\u062f\u0631\u06a9 \u062d\u0644\u0642\u0647 \u0631\u0648\u06cc\u062f\u0627\u062f \u0648 callbacks - 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