{"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\/ja\/tutorials\/understanding-the-event-loop-callbacks\/","title":{"rendered":"\u30a4\u30d9\u30f3\u30c8\u30eb\u30fc\u30d7\u3068\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u7406\u89e3\u3059\u308b"},"content":{"rendered":"

\u5c0e\u5165<\/h2>\n

\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u9ece\u660e\u671f\u306b\u306f\u3001\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306fHTML\u30da\u30fc\u30b8\u4e0a\u306e\u9759\u7684\u30c7\u30fc\u30bf\u3067\u69cb\u6210\u3055\u308c\u308b\u3053\u3068\u304c\u591a\u304b\u3063\u305f\u3002\u3057\u304b\u3057\u3001\u30a6\u30a7\u30d6\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u3088\u308a\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6\u304b\u3064\u52d5\u7684\u306b\u306a\u3063\u305f\u73fe\u5728\u3067\u306f\u3001API\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306e\u5916\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30ea\u30af\u30a8\u30b9\u30c8\u306a\u3069\u3001\u8ca0\u8377\u306e\u9ad8\u3044\u64cd\u4f5c\u3092\u5b9f\u884c\u3059\u308b\u5fc5\u8981\u6027\u304c\u9ad8\u307e\u3063\u3066\u3044\u308b\u3002JavaScript\u3067\u3053\u308c\u3089\u306e\u64cd\u4f5c\u3092\u5b9f\u884c\u3059\u308b\u306b\u306f\u3001\u958b\u767a\u8005\u306f\u975e\u540c\u671f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u6280\u8853\u3092\u7528\u3044\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002.<\/p>\n

JavaScript\u306f\u30b7\u30f3\u30b0\u30eb\u30b9\u30ec\u30c3\u30c9\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3042\u308a\u3001\u8907\u6570\u306e\u64cd\u4f5c\u3092\u6b21\u3005\u306b\u51e6\u7406\u3059\u308b\u4e26\u884c\u5b9f\u884c\u30e2\u30c7\u30eb\u3092\u63a1\u7528\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u4e00\u5ea6\u306b1\u3064\u306e\u30b3\u30de\u30f3\u30c9\u3057\u304b\u51e6\u7406\u3067\u304d\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001API\u304b\u3089\u30c7\u30fc\u30bf\u3092\u8981\u6c42\u3059\u308b\u3088\u3046\u306a\u64cd\u4f5c\u306f\u3001\u8981\u6c42\u3059\u308b\u30c7\u30fc\u30bf\u306e\u30b5\u30a4\u30ba\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u63a5\u7d9a\u306e\u901f\u5ea6\u3001\u305d\u306e\u4ed6\u306e\u8981\u56e0\u306b\u5fdc\u3058\u3066\u3001\u51e6\u7406\u306b\u8981\u3059\u308b\u6642\u9593\u304c\u4e0d\u78ba\u5b9a\u306b\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002API\u547c\u3073\u51fa\u3057\u304c\u540c\u671f\u7684\u306b\u884c\u308f\u308c\u308b\u3068\u3001\u30d6\u30e9\u30a6\u30b6\u306f\u64cd\u4f5c\u304c\u5b8c\u4e86\u3059\u308b\u307e\u3067\u3001\u30b9\u30af\u30ed\u30fc\u30eb\u3084\u30dc\u30bf\u30f3\u306e\u30af\u30ea\u30c3\u30af\u3068\u3044\u3063\u305f\u30e6\u30fc\u30b6\u30fc\u5165\u529b\u3092\u51e6\u7406\u3067\u304d\u306a\u304f\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u3068\u547c\u3070\u308c\u307e\u3059\u3002.<\/p>\n

\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u52d5\u4f5c\u3092\u56de\u907f\u3059\u308b\u305f\u3081\u3001\u30d6\u30e9\u30a6\u30b6\u74b0\u5883\u306b\u306fJavaScript\u304c\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u591a\u304f\u306e\u975e\u540c\u671fWeb API\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306eAPI\u306f\u3001\u4ed6\u306e\u64cd\u4f5c\u3068\u9806\u756a\u306b\u5b9f\u884c\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u4e26\u884c\u3057\u3066\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u975e\u540c\u671f\u64cd\u4f5c\u306e\u51e6\u7406\u4e2d\u3082\u30e6\u30fc\u30b6\u30fc\u304c\u30d6\u30e9\u30a6\u30b6\u3092\u901a\u5e38\u901a\u308a\u4f7f\u7528\u3067\u304d\u308b\u305f\u3081\u4fbf\u5229\u3067\u3059\u3002.<\/p>\n

\u30a4\u30d9\u30f3\u30c8\u30eb\u30fc\u30d7<\/h2>\n

\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001JavaScript \u304c\u30a4\u30d9\u30f3\u30c8\u30eb\u30fc\u30d7\u3092\u4f7f\u3063\u3066\u975e\u540c\u671f\u30b3\u30fc\u30c9\u3092\u51e6\u7406\u3059\u308b\u65b9\u6cd5\u3092\u8aac\u660e\u3057\u307e\u3059\u3002\u307e\u305a\u3001\u30a4\u30d9\u30f3\u30c8\u30eb\u30fc\u30d7\u306e\u52d5\u4f5c\u3092\u30c7\u30e2\u3067\u78ba\u8a8d\u3057\u3001\u6b21\u306b\u30a4\u30d9\u30f3\u30c8\u30eb\u30fc\u30d7\u306e 2 \u3064\u306e\u8981\u7d20\u3067\u3042\u308b\u30b9\u30bf\u30c3\u30af\u3068\u30ad\u30e5\u30fc\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002.<\/p>\n

\u975e\u540c\u671fWeb API\u3092\u4e00\u5207\u4f7f\u7528\u3057\u306a\u3044JavaScript\u30b3\u30fc\u30c9\u306f\u3001\u540c\u671f\u7684\u306b\u3001\u3064\u307e\u308a\u4e00\u5ea6\u306b1\u3064\u305a\u3064\u9806\u756a\u306b\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u793a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u30013\u3064\u306e\u95a2\u6570\u304c\u547c\u3073\u51fa\u3055\u308c\u3001\u305d\u308c\u305e\u308c\u304c\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u6570\u5024\u3092\u8868\u793a\u3057\u307e\u3059\u3002<\/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
\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001console.log() \u3092\u4f7f\u7528\u3057\u3066\u6570\u5024\u3092\u51fa\u529b\u3059\u308b 3 \u3064\u306e\u95a2\u6570\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002.<\/p>\n
\u6b21\u306b\u3001\u95a2\u6570\u306e\u547c\u3073\u51fa\u3057\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n
\n
\/\/ Execute the functions\r\nfirst()\r\nsecond()\r\nthird()<\/code><\/pre>\n<\/div>\n
\u51fa\u529b\u306f\u3001\u95a2\u6570\u304c\u547c\u3073\u51fa\u3055\u308c\u305f\u9806\u5e8f\uff08first()\u3001second()\u3001three()\uff09\u306b\u57fa\u3065\u304d\u307e\u3059\u3002<\/p>\n
\n
Output\r\n1\r\n2\r\n3<\/code><\/pre>\n<\/div>\n
\u975e\u540c\u671fWeb API\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u3001\u30eb\u30fc\u30eb\u306f\u3088\u308a\u8907\u96d1\u306b\u306a\u308a\u307e\u3059\u3002\u8a66\u3057\u3066\u307f\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u7d44\u307f\u8fbc\u307fAPI\u306e1\u3064\u306f setTimeout \u3067\u3059\u3002\u3053\u308c\u306f\u30bf\u30a4\u30de\u30fc\u3092\u8a2d\u5b9a\u3057\u3001\u6307\u5b9a\u3055\u308c\u305f\u6642\u9593\u5f8c\u306b\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002setTimeout \u306f\u975e\u540c\u671f\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u3001\u5f85\u6a5f\u4e2d\u306b\u30d6\u30e9\u30a6\u30b6\u5168\u4f53\u304c\u30d5\u30ea\u30fc\u30ba\u3057\u3001\u30e6\u30fc\u30b6\u30fc\u30a8\u30af\u30b9\u30da\u30ea\u30a8\u30f3\u30b9\u304c\u4f4e\u4e0b\u3057\u307e\u3059\u3002.<\/p>\n
\u975e\u540c\u671f\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u30b7\u30df\u30e5\u30ec\u30fc\u30c8\u3059\u308b\u306b\u306f\u30012 \u756a\u76ee\u306e\u95a2\u6570\u306b setTimeout \u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/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 \u306f2\u3064\u306e\u5f15\u6570\u3092\u53d6\u308a\u307e\u3059\u3002\u975e\u540c\u671f\u306b\u5b9f\u884c\u3059\u308b\u95a2\u6570\u3068\u3001\u305d\u306e\u95a2\u6570\u3092\u547c\u3073\u51fa\u3059\u307e\u3067\u306e\u5f85\u6a5f\u6642\u9593\u3067\u3059\u3002\u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001console.log \u3092\u533f\u540d\u95a2\u6570\u306b\u683c\u7d0d\u3057\u3001setTimeout \u306b\u6e21\u3057\u3066\u30010\u30df\u30ea\u79d2\u5f8c\u306b\u95a2\u6570\u3092\u5b9f\u884c\u3059\u308b\u3088\u3046\u306b\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n
\u5148\u307b\u3069\u3068\u540c\u3058\u3088\u3046\u306b\u95a2\u6570\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002<\/p>\n
\n
\/\/ Execute the functions\r\nfirst()\r\nsecond()\r\nthird()<\/code><\/pre>\n<\/div>\n
setTimeout \u3092 0 \u306b\u8a2d\u5b9a\u3059\u308c\u3070\u3001\u3053\u308c\u3089 3 \u3064\u306e\u95a2\u6570\u3092\u5b9f\u884c\u3057\u3066\u3082\u6570\u5024\u304c\u9806\u756a\u306b\u8868\u793a\u3055\u308c\u308b\u3068\u601d\u308f\u308c\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001\u3053\u308c\u306f\u975e\u540c\u671f\u3067\u3042\u308b\u305f\u3081\u3001\u6700\u5f8c\u306e\u95a2\u6570\u3067 break \u304c\u767a\u751f\u3057\u3001\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n
\n
Output\r\n1\r\n3\r\n2<\/code><\/pre>\n<\/div>\n
\u30bf\u30a4\u30de\u30fc\u30920\u79d2\u306b\u8a2d\u5b9a\u3059\u308b\u304b5\u5206\u306b\u8a2d\u5b9a\u3059\u308b\u304b\u306f\u95a2\u4fc2\u3042\u308a\u307e\u305b\u3093\u3002\u975e\u540c\u671f\u30b3\u30fc\u30c9\u304b\u3089\u547c\u3073\u51fa\u3055\u308c\u308b console.log \u306f\u3001\u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\u306e\u540c\u671f\u95a2\u6570\u306e\u5f8c\u306b\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u3001JavaScript\u306e\u30db\u30b9\u30c8\u74b0\u5883\uff08\u3053\u306e\u5834\u5408\u306f\u30d6\u30e9\u30a6\u30b6\uff09\u304c\u3001\u540c\u6642\u767a\u751f\u307e\u305f\u306f\u4e26\u5217\u30a4\u30d9\u30f3\u30c8\u3092\u51e6\u7406\u3059\u308b\u305f\u3081\u306b\u30a4\u30d9\u30f3\u30c8\u30eb\u30fc\u30d7\u3068\u547c\u3070\u308c\u308b\u6982\u5ff5\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u305f\u3081\u3067\u3059\u3002JavaScript\u306f\u4e00\u5ea6\u306b1\u3064\u306e\u30b3\u30de\u30f3\u30c9\u3057\u304b\u5b9f\u884c\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u7279\u5b9a\u306e\u30b3\u30de\u30f3\u30c9\u304c\u3044\u3064\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u8a8d\u8b58\u3059\u308b\u305f\u3081\u306b\u30a4\u30d9\u30f3\u30c8\u30eb\u30fc\u30d7\u304c\u5fc5\u8981\u3067\u3059\u3002\u30a4\u30d9\u30f3\u30c8\u30eb\u30fc\u30d7\u306f\u3001\u30b9\u30bf\u30c3\u30af\u3068\u30ad\u30e5\u30fc\u306e\u6982\u5ff5\u3092\u4f7f\u7528\u3057\u3066\u3053\u308c\u3092\u51e6\u7406\u3057\u307e\u3059\u3002.<\/p>\n
\u30b9\u30bf\u30c3\u30af<\/h5>\n
\u30b9\u30bf\u30c3\u30af\u3001\u307e\u305f\u306f\u30b3\u30fc\u30eb\u30b9\u30bf\u30c3\u30af\u306f\u3001\u73fe\u5728\u5b9f\u884c\u4e2d\u306e\u95a2\u6570\u306e\u72b6\u614b\u3092\u4fdd\u6301\u3057\u307e\u3059\u3002\u30b9\u30bf\u30c3\u30af\u306e\u6982\u5ff5\u306b\u99b4\u67d3\u307f\u306e\u306a\u3044\u65b9\u306e\u305f\u3081\u306b\u8aac\u660e\u3059\u308b\u3068\u3001\u300c\u5f8c\u5165\u308c\u5148\u51fa\u3057\u300d\uff08LIFO\uff09\u7279\u6027\u3092\u6301\u3064\u914d\u5217\u3068\u8003\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u30b9\u30bf\u30c3\u30af\u306e\u4e00\u756a\u4e0b\u304b\u3089\u3057\u304b\u8981\u7d20\u3092\u8ffd\u52a0\u307e\u305f\u306f\u524a\u9664\u3067\u304d\u307e\u305b\u3093\u3002JavaScript\u306f\u3001\u30b9\u30bf\u30c3\u30af\u4e0a\u306e\u73fe\u5728\u306e\u30d5\u30ec\u30fc\u30e0\uff08\u307e\u305f\u306f\u7279\u5b9a\u306e\u74b0\u5883\u3067\u306f\u95a2\u6570\u547c\u3073\u51fa\u3057\uff09\u3092\u5b9f\u884c\u3057\u3001\u305d\u306e\u5f8c\u3001\u305d\u308c\u3092\u524a\u9664\u3057\u3066\u6b21\u306e\u30d5\u30ec\u30fc\u30e0\u306b\u9032\u307f\u307e\u3059\u3002.<\/p>\n
\u540c\u671f\u30b3\u30fc\u30c9\u306e\u307f\u3092\u542b\u3080\u4f8b\u3067\u306f\u3001\u30d6\u30e9\u30a6\u30b6\u306f\u6b21\u306e\u9806\u5e8f\u3067\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n
    \n
  • \u521d\u3081\uff08\uff09<\/strong> \u30b9\u30bf\u30c3\u30af\u306b\u8ffd\u52a0\u3057\u3001\u30b3\u30f3\u30bd\u30fc\u30eb\u306b 1 \u3092\u8a18\u9332\u3059\u308b first() \u3092\u5b9f\u884c\u3057\u3001\u30b9\u30bf\u30c3\u30af\u304b\u3089 first() \u3092\u524a\u9664\u3057\u307e\u3059\u3002.<\/li>\n
  • 2\u756a\u76ee\uff08\uff09<\/strong> \u30b9\u30bf\u30c3\u30af\u306b\u8ffd\u52a0\u3057\u3001\u30b3\u30f3\u30bd\u30fc\u30eb\u306b 2 \u3092\u51fa\u529b\u3059\u308b second() \u3092\u5b9f\u884c\u3057\u3001\u30b9\u30bf\u30c3\u30af\u304b\u3089 second() \u3092\u524a\u9664\u3057\u307e\u3059\u3002.<\/li>\n
  • \u4e09\u756a\u76ee \uff08\uff09<\/strong> \u30b9\u30bf\u30c3\u30af\u306b\u8ffd\u52a0\u3057\u3001\u30b3\u30f3\u30bd\u30fc\u30eb\u306b 3 \u3092\u8a18\u9332\u3059\u308b third() \u3092\u5b9f\u884c\u3057\u3001\u30b9\u30bf\u30c3\u30af\u304b\u3089 third() \u3092\u524a\u9664\u3057\u307e\u3059\u3002.<\/li>\n<\/ul>\n
    setTimout \u3092\u4f7f\u7528\u3057\u305f 2 \u756a\u76ee\u306e\u4f8b\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n
      \n
    • \u521d\u3081\uff08\uff09<\/strong> \u30b9\u30bf\u30c3\u30af\u306b\u8ffd\u52a0\u3057\u3001\u30b3\u30f3\u30bd\u30fc\u30eb\u306b 1 \u3092\u8a18\u9332\u3059\u308b first() \u3092\u5b9f\u884c\u3057\u3001\u30b9\u30bf\u30c3\u30af\u304b\u3089 first() \u3092\u524a\u9664\u3057\u307e\u3059\u3002.<\/li>\n
    • 2\u756a\u76ee\uff08\uff09<\/strong> \u30b9\u30bf\u30c3\u30af\u306b\u8ffd\u52a0\u3057\u3001second() \u3092\u5b9f\u884c\u3057\u307e\u3059\u3002.\n
        \n
      • \u30b9\u30bf\u30c3\u30af\u306b setTimeout() \u3092\u8ffd\u52a0\u3057\u3001\u30bf\u30a4\u30de\u30fc\u3092\u958b\u59cb\u3057\u3066\u533f\u540d\u95a2\u6570\u3092\u30ad\u30e5\u30fc\u306b\u8ffd\u52a0\u3059\u308b Web API setTimeout() \u3092\u5b9f\u884c\u3057\u3001\u30b9\u30bf\u30c3\u30af\u304b\u3089 setTimeout() \u3092\u524a\u9664\u3057\u307e\u3059\u3002.<\/li>\n<\/ul>\n<\/li>\n
      • 2\u756a\u76ee\uff08\uff09<\/strong> \u30b9\u30bf\u30c3\u30af\u304b\u3089\u524a\u9664\u3057\u307e\u3059\u3002.<\/li>\n
      • \u4e09\u756a\u76ee \uff08\uff09<\/strong> \u30b9\u30bf\u30c3\u30af\u306b\u8ffd\u52a0\u3057\u3001\u30b3\u30f3\u30bd\u30fc\u30eb\u306b 3 \u3092\u8a18\u9332\u3059\u308b third() \u3092\u5b9f\u884c\u3057\u3001\u30b9\u30bf\u30c3\u30af\u304b\u3089 third() \u3092\u524a\u9664\u3057\u307e\u3059\u3002.<\/li>\n
      • \u30a4\u30d9\u30f3\u30c8 \u30eb\u30fc\u30d7\u306f\u3001\u30ad\u30e5\u30fc\u5185\u306e\u4fdd\u7559\u4e2d\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3001setTimeout() \u304b\u3089\u533f\u540d\u95a2\u6570\u3092\u898b\u3064\u3051\u3066\u3001\u30b3\u30f3\u30bd\u30fc\u30eb\u306b 2 \u3092\u8a18\u9332\u3059\u308b\u95a2\u6570\u3092\u30b9\u30bf\u30c3\u30af\u306b\u8ffd\u52a0\u3057\u3001\u30b9\u30bf\u30c3\u30af\u304b\u3089\u524a\u9664\u3057\u307e\u3059\u3002.<\/li>\n<\/ul>\n
        setTimeout \u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u975e\u540c\u671f Web API \u3067\u30ad\u30e5\u30fc\u306e\u6982\u5ff5\u304c\u5c0e\u5165\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u306e\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb\u3067\u5f8c\u307b\u3069\u8aac\u660e\u3057\u307e\u3059\u3002.<\/p>\n
        \u5217<\/h5>\n
        \u30ad\u30e5\u30fc\uff08\u30e1\u30c3\u30bb\u30fc\u30b8\u30ad\u30e5\u30fc\u307e\u305f\u306f\u30bf\u30b9\u30af\u30ad\u30e5\u30fc\u3068\u3082\u547c\u3070\u308c\u308b\uff09\u306f\u3001\u95a2\u6570\u306e\u5f85\u6a5f\u9818\u57df\u3067\u3059\u3002\u30b3\u30fc\u30eb\u30b9\u30bf\u30c3\u30af\u304c\u7a7a\u306e\u5834\u5408\u3001\u30a4\u30d9\u30f3\u30c8\u30eb\u30fc\u30d7\u306f\u30ad\u30e5\u30fc\u5185\u306e\u4fdd\u7559\u4e2d\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u6700\u3082\u53e4\u3044\u3082\u306e\u304b\u3089\u9806\u306b\u78ba\u8a8d\u3057\u307e\u3059\u3002\u4fdd\u7559\u4e2d\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u898b\u3064\u304b\u3063\u305f\u5834\u5408\u306f\u3001\u305d\u308c\u3092\u30b9\u30bf\u30c3\u30af\u306b\u8ffd\u52a0\u3057\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u306b\u542b\u307e\u308c\u308b\u95a2\u6570\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002.<\/p>\n
        setTimeout \u306e\u4f8b\u3067\u306f\u3001\u30bf\u30a4\u30de\u30fc\u304c 0 \u79d2\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u533f\u540d\u95a2\u6570\u306f\u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\u306e\u6b8b\u308a\u306e\u5b9f\u884c\u306e\u76f4\u5f8c\u306b\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u30bf\u30a4\u30de\u30fc\u306f\u3001\u30b3\u30fc\u30c9\u304c\u6b63\u78ba\u306b 0 \u79d2\u307e\u305f\u306f\u7279\u5b9a\u306e\u6642\u9593\u306b\u5b9f\u884c\u3055\u308c\u308b\u3053\u3068\u3092\u610f\u5473\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u305d\u306e\u6642\u9593\u4e2d\u306b\u533f\u540d\u95a2\u6570\u3092\u30ad\u30e5\u30fc\u306b\u8ffd\u52a0\u3059\u308b\u3053\u3068\u3092\u610f\u5473\u3059\u308b\u3053\u3068\u3092\u899a\u3048\u3066\u304a\u304f\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u3053\u306e\u30ad\u30e5\u30fc\u30b7\u30b9\u30c6\u30e0\u306f\u3001\u30bf\u30a4\u30de\u30fc\u304c\u671f\u9650\u5207\u308c\u5f8c\u306b\u533f\u540d\u95a2\u6570\u3092\u76f4\u63a5\u30b9\u30bf\u30c3\u30af\u306b\u8ffd\u52a0\u3059\u308b\u3068\u3001\u73fe\u5728\u5b9f\u884c\u4e2d\u306e\u95a2\u6570\u304c\u4e2d\u65ad\u3055\u308c\u3001\u610f\u56f3\u3057\u306a\u3044\u4e88\u6e2c\u4e0d\u53ef\u80fd\u306a\u7d50\u679c\u304c\u751f\u3058\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u306b\u5b58\u5728\u3057\u307e\u3059\u3002.<\/p>\n
        \u6ce8: \u30b8\u30e7\u30d6\u30ad\u30e5\u30fc\u307e\u305f\u306f\u30de\u30a4\u30af\u30ed\u30bf\u30b9\u30af\u30ad\u30e5\u30fc\u3068\u547c\u3070\u308c\u308b\u3001Promise\u3092\u51e6\u7406\u3059\u308b\u5225\u306e\u30ad\u30e5\u30fc\u3082\u3042\u308a\u307e\u3059\u3002Promise\u306e\u3088\u3046\u306a\u30de\u30a4\u30af\u30ed\u30bf\u30b9\u30af\u306f\u3001setTimeout\u306e\u3088\u3046\u306a\u30de\u30af\u30ed\u30bf\u30b9\u30af\u3088\u308a\u3082\u9ad8\u3044\u512a\u5148\u5ea6\u3067\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002.<\/span><\/p>\n
        \u30a4\u30d9\u30f3\u30c8\u30eb\u30fc\u30d7\u304c\u30b9\u30bf\u30c3\u30af\u3068\u30ad\u30e5\u30fc\u3092\u4f7f\u3063\u3066\u30b3\u30fc\u30c9\u5b9f\u884c\u9806\u5e8f\u3092\u5236\u5fa1\u3059\u308b\u4ed5\u7d44\u307f\u304c\u308f\u304b\u3063\u305f\u306e\u3067\u3001\u6b21\u306f\u30b3\u30fc\u30c9\u5185\u3067\u5b9f\u884c\u9806\u5e8f\u3092\u5236\u5fa1\u3059\u308b\u65b9\u6cd5\u3092\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002\u305d\u306e\u305f\u3081\u306b\u306f\u3001\u307e\u305a\u30a4\u30d9\u30f3\u30c8\u30eb\u30fc\u30d7\u304c\u975e\u540c\u671f\u30b3\u30fc\u30c9\u3092\u6b63\u3057\u304f\u51e6\u7406\u3059\u308b\u305f\u3081\u306e\u4e3b\u306a\u65b9\u6cd5\u3001\u3064\u307e\u308a\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3057\u3087\u3046\u3002.<\/span><\/p>\n
        \u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570<\/h2>\n
        setTimeout \u306e\u4f8b\u3067\u306f\u3001\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3092\u6307\u5b9a\u3057\u305f\u95a2\u6570\u306f\u3001\u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\u306e\u5b9f\u884c\u306e\u30e1\u30a4\u30f3\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306b\u3042\u308b\u3059\u3079\u3066\u306e\u51e6\u7406\u306e\u5f8c\u306b\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u3057\u304b\u3057\u30013\u756a\u76ee\u306e\u95a2\u6570\u306a\u3069\u3001\u95a2\u6570\u306e1\u3064\u304c\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u5f8c\u306b\u78ba\u5b9f\u306b\u5b9f\u884c\u3055\u308c\u308b\u3088\u3046\u306b\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u975e\u540c\u671f\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u624b\u6cd5\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u306e\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u306f\u3001\u30c7\u30fc\u30bf\u3092\u542b\u3080\u975e\u540c\u671fAPI\u547c\u3073\u51fa\u3057\u3092\u8868\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002API\u547c\u3073\u51fa\u3057\u304b\u3089\u53d6\u5f97\u3057\u305f\u30c7\u30fc\u30bf\u3092\u51e6\u7406\u3059\u308b\u306b\u306f\u3001\u307e\u305a\u30c7\u30fc\u30bf\u304c\u8fd4\u3055\u308c\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n
        \u3053\u306e\u554f\u984c\u306e\u4e3b\u306a\u89e3\u6c7a\u7b56\u306f\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306b\u306f\u7279\u5225\u306a\u69cb\u6587\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306f\u3001\u5358\u306b\u5225\u306e\u95a2\u6570\u306b\u5f15\u6570\u3068\u3057\u3066\u6e21\u3055\u308c\u308b\u95a2\u6570\u3067\u3059\u3002\u5225\u306e\u95a2\u6570\u3092\u5f15\u6570\u3068\u3057\u3066\u53d7\u3051\u53d6\u308b\u95a2\u6570\u306f\u3001\u9ad8\u968e\u95a2\u6570\u3068\u547c\u3070\u308c\u307e\u3059\u3002\u3053\u306e\u5b9a\u7fa9\u306b\u3088\u308c\u3070\u3001\u4efb\u610f\u306e\u95a2\u6570\u306f\u5f15\u6570\u3068\u3057\u3066\u6e21\u3055\u308c\u308c\u3070\u3001\u547c\u3073\u51fa\u3055\u308c\u308b\u95a2\u6570\u306b\u306a\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u96fb\u8a71\u306e\u901a\u8a71\u306f\u672c\u8cea\u7684\u306b\u975e\u540c\u671f\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u975e\u540c\u671f\u51e6\u7406\u306e\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/p>\n
        \u4ee5\u4e0b\u306f\u3001\u9ad8\u968e\u95a2\u6570\u3068\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u306e\u69cb\u6587\u30b3\u30fc\u30c9\u4f8b\u3067\u3059\u3002<\/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
        \u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u95a2\u6570 fn \u3092\u5b9a\u7fa9\u3057\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3092\u5f15\u6570\u3068\u3057\u3066\u53d7\u3051\u53d6\u308b\u95a2\u6570 aboveOrderFunction \u3092\u5b9a\u7fa9\u3057\u3001fn \u3092\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3068\u3057\u3066 aboveOrderFunction \u306b\u6e21\u3057\u307e\u3059\u3002.<\/p>\n
        \u3053\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u6b21\u306e\u3053\u3068\u304c\u5b9f\u73fe\u3055\u308c\u307e\u3059\u3002<\/p>\n
        \n
        Output\r\nJust a function<\/code><\/pre>\n<\/div>\n
        setTimeout\u3092\u4f7f\u3063\u305f1\u3064\u76ee\u30012\u3064\u76ee\u30013\u3064\u76ee\u306e\u95a2\u6570\u306b\u623b\u308a\u307e\u3057\u3087\u3046\u3002\u3053\u3053\u307e\u3067\u306e\u5185\u5bb9\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/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
        \u8ab2\u984c\u306f\u30013\u756a\u76ee\u306e\u95a2\u6570\u306e\u5b9f\u884c\u3092\u30012\u756a\u76ee\u306e\u95a2\u6570\u5185\u306e\u975e\u540c\u671f\u30a2\u30af\u30b7\u30e7\u30f3\u304c\u5b8c\u4e86\u3059\u308b\u307e\u3067\u5e38\u306b\u9045\u5ef6\u3055\u305b\u308b\u3053\u3068\u3067\u3059\u3002\u3053\u3053\u3067\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u304c\u5f79\u7acb\u3061\u307e\u3059\u30021\u756a\u76ee\u30012\u756a\u76ee\u30013\u756a\u76ee\u306e\u95a2\u6570\u3092\u6700\u4e0a\u4f4d\u30ec\u30d9\u30eb\u3067\u5b9f\u884c\u3059\u308b\u4ee3\u308f\u308a\u306b\u30013\u756a\u76ee\u306e\u95a2\u6570\u30922\u756a\u76ee\u306e\u95a2\u6570\u306e\u5f15\u6570\u3068\u3057\u3066\u6e21\u3057\u307e\u3059\u30022\u756a\u76ee\u306e\u95a2\u6570\u306f\u3001\u975e\u540c\u671f\u30a2\u30af\u30b7\u30e7\u30f3\u304c\u5b8c\u4e86\u3057\u305f\u5f8c\u306b\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002.<\/p>\n
        \u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3067\u5b9f\u88c5\u3055\u308c\u305f 3 \u3064\u306e\u95a2\u6570\u3092\u6b21\u306b\u793a\u3057\u307e\u3059\u3002<\/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
        \u6b21\u306b\u30011 \u756a\u76ee\u3068 2 \u756a\u76ee\u3092\u5b9f\u884c\u3057\u30013 \u756a\u76ee\u3092 2 \u756a\u76ee\u306e\u5f15\u6570\u3068\u3057\u3066\u6e21\u3057\u307e\u3059\u3002<\/p>\n
        \n
        first()\r\nsecond(third)<\/code><\/pre>\n<\/div>\n
        \u3053\u306e\u30b3\u30fc\u30c9 \u30d6\u30ed\u30c3\u30af\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u6b21\u306e\u51fa\u529b\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n
        \n
        Output\r\n1\r\n2\r\n3<\/code><\/pre>\n<\/div>\n
        \u6700\u521d\u306b 1 \u304c\u51fa\u529b\u3055\u308c\u3001\u30bf\u30a4\u30de\u30fc\u304c\u671f\u9650\u5207\u308c\u306b\u306a\u3063\u305f\u5f8c (\u3053\u306e\u5834\u5408\u306f 0 \u79d2\u3067\u3059\u304c\u3001\u4efb\u610f\u306e\u5024\u306b\u5909\u66f4\u3067\u304d\u307e\u3059)\u30012 \u304c\u51fa\u529b\u3055\u308c\u3001\u6b21\u306b 3 \u304c\u51fa\u529b\u3055\u308c\u307e\u3059\u3002\u975e\u540c\u671f Web API (setTimeout) \u304c\u5b8c\u4e86\u3059\u308b\u307e\u3067\u52d5\u4f5c\u3057\u307e\u3059\u3002.<\/p>\n
        \u3053\u3053\u3067\u91cd\u8981\u306a\u306e\u306f\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306f\u975e\u540c\u671f\u3067\u306f\u306a\u3044\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002setTimeout \u306f\u975e\u540c\u671f\u30bf\u30b9\u30af\u306e\u51e6\u7406\u3092\u62c5\u5f53\u3059\u308b\u975e\u540c\u671f Web API \u3067\u3059\u3002\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u306f\u3001\u975e\u540c\u671f\u30bf\u30b9\u30af\u304c\u5b8c\u4e86\u3057\u305f\u3068\u304d\u306b\u901a\u77e5\u3092\u53d7\u3051\u53d6\u308a\u3001\u305d\u306e\u30bf\u30b9\u30af\u306e\u6210\u529f\u307e\u305f\u306f\u5931\u6557\u3092\u51e6\u7406\u3059\u308b\u3053\u3068\u306e\u307f\u3092\u53ef\u80fd\u306b\u3057\u307e\u3059\u3002.<\/p>\n
        \u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u4f7f\u7528\u3057\u3066\u975e\u540c\u671f\u30bf\u30b9\u30af\u3092\u5b9f\u884c\u3059\u308b\u65b9\u6cd5\u3092\u5b66\u7fd2\u3057\u305f\u306e\u3067\u3001\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u547c\u3073\u51fa\u3057\u3092\u30cd\u30b9\u30c8\u3057\u3059\u304e\u3066\u300c\u7834\u6ec5\u306e\u30d4\u30e9\u30df\u30c3\u30c9\u300d\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u306b\u95a2\u9023\u3059\u308b\u554f\u984c\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002.<\/p>\n
        \u30cd\u30b9\u30c8\u3055\u308c\u305f\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3068\u30d4\u30e9\u30df\u30c3\u30c9\u30aa\u30d6\u30c9\u30a5\u30fc\u30e0<\/h2>\n
        \u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306f\u3001\u3042\u308b\u95a2\u6570\u306e\u5b9f\u884c\u3092\u5225\u306e\u95a2\u6570\u306e\u5b9f\u884c\u304c\u5b8c\u4e86\u3057\u3066\u30c7\u30fc\u30bf\u3092\u8fd4\u3059\u307e\u3067\u9045\u5ef6\u3055\u305b\u308b\u52b9\u679c\u7684\u306a\u65b9\u6cd5\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u306f\u30cd\u30b9\u30c8\u69cb\u9020\u3092\u6301\u3064\u305f\u3081\u3001\u76f8\u4e92\u306b\u4f9d\u5b58\u3059\u308b\u975e\u540c\u671f\u30ea\u30af\u30a8\u30b9\u30c8\u304c\u9023\u7d9a\u3057\u3066\u591a\u6570\u3042\u308b\u5834\u5408\u3001\u30b3\u30fc\u30c9\u304c\u8907\u96d1\u306b\u306a\u308a\u304c\u3061\u3067\u3059\u3002\u3053\u308c\u306f\u521d\u671f\u306eJavaScript\u958b\u767a\u8005\u306b\u3068\u3063\u3066\u5927\u304d\u306a\u30b9\u30c8\u30ec\u30b9\u3067\u3042\u308a\u3001\u30cd\u30b9\u30c8\u3055\u308c\u305f\u547c\u3073\u51fa\u3057\u3092\u542b\u3080\u30b3\u30fc\u30c9\u306f\u300c\u30d4\u30e9\u30df\u30c3\u30c9\u30fb\u30aa\u30d6\u30fb\u30c8\u30fc\u30e1\u30f3\u30c8\u300d\u3084\u300c\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u5730\u7344\u300d\u3068\u547c\u3070\u308c\u308b\u3053\u3068\u304c\u591a\u304b\u3063\u305f\u306e\u3067\u3059\u3002.<\/p>\n
        \u30cd\u30b9\u30c8\u3055\u308c\u305f\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u306e\u30c7\u30e2\u3092\u6b21\u306b\u793a\u3057\u307e\u3059\u3002<\/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
        \u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u65b0\u3057\u3044 setTimeout \u304c\u305d\u308c\u305e\u308c\u9ad8\u968e\u95a2\u6570\u5185\u306b\u914d\u7f6e\u3055\u308c\u3001\u547c\u3073\u51fa\u3057\u306e\u968e\u5c64\u304c\u3069\u3093\u3069\u3093\u6df1\u304f\u306a\u3063\u3066\u3044\u304d\u307e\u3059\u3002\u3053\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
        \n
        Output\r\n1\r\n2\r\n3<\/code><\/pre>\n<\/div>\n
        \u5b9f\u969b\u306e\u975e\u540c\u671f\u30b3\u30fc\u30c9\u3067\u306f\u3001\u3053\u308c\u306f\u306f\u308b\u304b\u306b\u8907\u96d1\u306b\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u975e\u540c\u671f\u30b3\u30fc\u30c9\u3067\u306f\u30a8\u30e9\u30fc\u51e6\u7406\u3092\u884c\u3044\u3001\u5404\u30ec\u30b9\u30dd\u30f3\u30b9\u304b\u3089\u6b21\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u306b\u30c7\u30fc\u30bf\u3092\u6e21\u3059\u5fc5\u8981\u304c\u3042\u308b\u3067\u3057\u3087\u3046\u3002\u3053\u308c\u3092\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3067\u884c\u3046\u3068\u3001\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3068\u4fdd\u5b88\u6027\u304c\u640d\u306a\u308f\u308c\u307e\u3059\u3002.<\/p>\n
        \u4ee5\u4e0b\u306f\u3001\u5b9f\u969b\u306b\u904a\u3093\u3067\u307f\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3001\u3088\u308a\u73fe\u5b9f\u7684\u306a\u300c\u904b\u547d\u306e\u30d4\u30e9\u30df\u30c3\u30c9\u300d\u306e\u5b9f\u4f8b\u3067\u3059\u3002<\/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
        \u3053\u306e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u5404\u95a2\u6570\u306e\u53ef\u80fd\u306a\u5fdc\u7b54\u3068\u53ef\u80fd\u306a\u30a8\u30e9\u30fc\u3092\u8003\u616e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u305f\u3081\u3001callbackHell \u95a2\u6570\u304c\u8996\u899a\u7684\u306b\u308f\u304b\u308a\u306b\u304f\u304f\u306a\u308a\u307e\u3059\u3002.<\/p>\n
        \u3053\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u6b21\u306e\u7d50\u679c\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/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
        \u7d50\u679c<\/h2>\n
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