{"id":1765,"date":"2025-06-02T10:33:08","date_gmt":"2025-06-02T01:33:08","guid":{"rendered":"https:\/\/route-zero.com\/recruit\/?post_type=route&#038;p=1765"},"modified":"2025-12-02T10:33:21","modified_gmt":"2025-12-02T01:33:21","slug":"javascript-this%e3%81%ae%e9%81%95%e3%81%84%e3%83%bb%e3%83%90%e3%82%b0%e4%ba%8b%e4%be%8b7%e9%81%b8%ef%bd%9c%e3%82%a2%e3%83%ad%e3%83%bc%e9%96%a2%e6%95%b0%e3%82%84bind%e3%81%ae%e8%bf%b7%e3%82%8f%e3%81%aa","status":"publish","type":"route","link":"https:\/\/route-zero.com\/recruit\/route\/1765\/","title":{"rendered":"JavaScript this\u306e\u9055\u3044\u30fb\u30d0\u30b0\u4e8b\u4f8b7\u9078\uff5c\u30a2\u30ed\u30fc\u95a2\u6570\u3084bind\u306e\u8ff7\u308f\u306a\u3044\u4f7f\u3044\u5206\u3051"},"content":{"rendered":"<div>\n<p>\n    <strong>\u300cthis\u3001\u601d\u3063\u305f\u901a\u308a\u306b\u52d5\u3044\u3066\u304f\u308c\u306a\u3044\u2026\u300d<\/strong>\u2014\u2014\u3053\u3093\u306a\u30e2\u30e4\u30e2\u30e4\u3001\u958b\u767a\u73fe\u5834\u3067\u4f55\u5ea6\u3082\u7d4c\u9a13\u3057\u307e\u305b\u3093\u304b\uff1f<br \/>\n    \u901a\u5e38\u95a2\u6570\u3084<strong>\u30a2\u30ed\u30fc\u95a2\u6570<\/strong>\u3001<strong>\u30af\u30e9\u30b9<\/strong>\u3084<strong>bind<\/strong>\u3002\u3069\u308c\u3082\u201cthis\u201d\u306e\u53c2\u7167\u5148\u304c\u5fae\u5999\u306b\u9055\u3044\u3001\u30d0\u30b0\u3084\u624b\u623b\u308a\u3001\u30ec\u30d3\u30e5\u30fc\u6307\u6458\u306e\u201c\u5143\u51f6\u201d\u306b\u306a\u308a\u304c\u3061\u3067\u3059\u3002<br \/>\n    \u306a\u305c\u3053\u3093\u306a\u306b\u8907\u96d1\uff1f \u3069\u3046\u9078\u3079\u3070\u5b89\u5168\uff1f<br \/>\n    \u79c1\u305f\u3061\u304c<strong>\u4eca\u3059\u3050\u8179\u843d\u3061\u3067\u304d\u308b<\/strong>\u3088\u3046\u3001\u300c\u4ed5\u7d44\u307f \u2192 \u30df\u30b9\u4f8b \u2192 \u89e3\u6c7a\u7b56\u300d\u3092\u77ed\u304f\u5206\u89e3\u3057\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002\n  <\/p>\n<ul>\n<li><strong>this<\/strong>\u306e\u57fa\u672c\u4ed5\u69d8\u30fb\u9055\u3044\u3092\u4f53\u7cfb\u7684\u306b\u6574\u7406<\/li>\n<li>\u30d0\u30b0\u30fb\u624b\u623b\u308a\u3092\u9632\u3050\u305f\u3081\u306e<strong>\u73fe\u5834\u30ce\u30a6\u30cf\u30a6<\/strong><\/li>\n<li>\u30c1\u30fc\u30e0\u30ec\u30d3\u30e5\u30fc\u3084\u6559\u80b2\u306b\u3082\u4f7f\u3048\u308b<strong>\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/strong><\/li>\n<\/ul>\n<hr \/>\n<blockquote>\n<p>\n      <strong>\u7528\u8a9e\u89e3\u8aac\uff1athis<\/strong><br \/>\n      JavaScript\u3067\u95a2\u6570\u3084\u30e1\u30bd\u30c3\u30c9\u304c\u53c2\u7167\u3059\u308b\u300c\u5b9f\u884c\u4e2d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u300d\u3002\u547c\u3073\u51fa\u3057\u65b9\u306b\u3088\u3063\u3066\u6307\u3059\u3082\u306e\u304c\u5909\u308f\u308b\u3002\n    <\/p>\n<p>\n      <strong>\u7528\u8a9e\u89e3\u8aac\uff1a\u30a2\u30ed\u30fc\u95a2\u6570<\/strong><br \/>\n      ES6\u3067\u5c0e\u5165\u3055\u308c\u305f\u77ed\u3044\u8a18\u6cd5\u306e\u95a2\u6570\u3002\u5b9a\u7fa9\u6642\u306e\u5916\u5074\u30b9\u30b3\u30fc\u30d7\u306ethis\u3092\u53c2\u7167\u3057\u3001\u901a\u5e38\u306e\u95a2\u6570\u3068\u306f\u6319\u52d5\u304c\u7570\u306a\u308b\u3002\n    <\/p>\n<p>\n      <strong>\u7528\u8a9e\u89e3\u8aac\uff1abind<\/strong><br \/>\n      \u95a2\u6570\u306ethis\u3092\u7279\u5b9a\u306e\u5024\u306b\u56fa\u5b9a\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\u3002\u65b0\u3057\u3044\u95a2\u6570\u3092\u8fd4\u3059\u3002\n    <\/p>\n<p>\n      <strong>\u7528\u8a9e\u89e3\u8aac\uff1a\u30af\u30e9\u30b9<\/strong><br \/>\n      ES6\u4ee5\u964d\u3067\u4f7f\u3048\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u8a2d\u8a08\u306e\u4ed5\u7d44\u307f\u3002\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u751f\u6210\u3084\u7d99\u627f\u304c\u53ef\u80fd\u3002\n    <\/p>\n<\/blockquote>\n<h2>1. \u306a\u305cJavaScript\u306ethis\u306f\u8ff7\u3044\u3084\u3059\u3044\uff1f\u73fe\u5834\u3042\u308b\u3042\u308b\u306e\u6df7\u4e71<\/h2>\n<p>\n    <strong>\u300cthis\u304cundefined\uff1f\u300d<br \/>\u300c\u30a4\u30d9\u30f3\u30c8\u5185\u3067this\u304c\u671f\u5f85\u901a\u308a\u3058\u3083\u306a\u3044\u2026\u300d<\/strong><br \/>\n    \u5b9f\u969b\u3001\u73fe\u5834\u3067\u3053\u3093\u306a\u5931\u6557\u304c\u3088\u304f\u8d77\u304d\u3066\u3044\u307e\u3059\u3002\n  <\/p>\n<ul>\n<li>\u95a2\u6570\u3084\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u65b9\u3067<strong>this<\/strong>\u304c\u30b0\u30ed\u30fc\u30d0\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3084undefined\u306b\u306a\u308b<\/li>\n<li>\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u30fb\u30a4\u30d9\u30f3\u30c8\u30ea\u30b9\u30ca\u30fc\u3067this\u304c\u201c\u5909\u5316\u201d\u3059\u308b<\/li>\n<li><strong>\u30a2\u30ed\u30fc\u95a2\u6570<\/strong>\u3067this\u304c\u201c\u5916\u5074\u201d\u3092\u53c2\u7167\u3057\u3066\u30d0\u30b0\u767a\u751f<\/li>\n<li><strong>\u30af\u30e9\u30b9\u7d99\u627f<\/strong>\u3084\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u30c1\u30a7\u30fc\u30f3\u3067\u6319\u52d5\u304c\u8aad\u307f\u306b\u304f\u304f\u306a\u308b<\/li>\n<\/ul>\n<p>\u3053\u3046\u3057\u305f\u6df7\u4e71\u306e\u80cc\u666f\u306b\u306f\u3001<strong>this\u304c\u300c\u547c\u3073\u51fa\u3057\u65b9\u300d\u3067\u6c7a\u307e\u308b<\/strong>\u3068\u3044\u3046JavaScript\u72ec\u7279\u306e\u4ed5\u69d8\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\n    \uff08\u300cundefined\u300d\u3084this\u306e\u6df7\u4e71\u306b\u3064\u3044\u3066\u306f\u300e<a href=\"https:\/\/route-zero.com\/recruit\/route\/1340\/\">\u306a\u305c\u300cundefined\u300d\u304c\u51fa\u308b\uff1f\u539f\u56e0\u3068\u89e3\u6c7a\u6cd510\u9078\uff5cJavaScript \u306e\u30c7\u30d0\u30c3\u30b0\u306b\u52b9\u304f\u5b9f\u4f8b\u96c6<\/a>\u300f\u3082\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\uff09\n  <\/p>\n<hr \/>\n<h2>2. JavaScript\u306ethis\u3068\u306f\uff1f\u4ed5\u7d44\u307f\u3068\u6c7a\u307e\u308a\u65b9<\/h2>\n<p>\n    <strong>this<\/strong>\u306f\u3001\u95a2\u6570\u3084\u30e1\u30bd\u30c3\u30c9\u306e\u300c\u547c\u3073\u51fa\u3057\u65b9\u300d\u306b\u3088\u3063\u3066\u81ea\u52d5\u7684\u306b\u5024\u304c\u6c7a\u307e\u308a\u307e\u3059\u3002\n  <\/p>\n<ul>\n<li><strong>\u30b0\u30ed\u30fc\u30d0\u30eb\u547c\u3073\u51fa\u3057<\/strong>\uff1a\u901a\u5e38\u95a2\u6570\u3092\u76f4\u63a5\u547c\u3076\u3068this\u306f\u30b0\u30ed\u30fc\u30d0\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff08\u30d6\u30e9\u30a6\u30b6\u306a\u3089window\u3001\u53b3\u683c\u30e2\u30fc\u30c9\u306fundefined\uff09<\/li>\n<li><strong>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057<\/strong>\uff1a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30e1\u30bd\u30c3\u30c9\u306a\u3089\u3001\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u81ea\u8eab<\/li>\n<li><strong>\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\uff08new\uff09<\/strong>\uff1a\u65b0\u3057\u3044\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u81ea\u8eab<\/li>\n<li><strong>\u660e\u793a\u7684\u306abind\/call\/apply<\/strong>\uff1a\u6307\u5b9a\u3057\u305f\u5024<\/li>\n<li><strong>\u30a2\u30ed\u30fc\u95a2\u6570<\/strong>\uff1a\u5b9a\u7fa9\u6642\u306e\u201c\u5916\u5074\u30b9\u30b3\u30fc\u30d7\u201d\u306ethis\u3092\u305d\u306e\u307e\u307e\u4f7f\u3046\uff08\u5909\u5316\u3057\u306a\u3044\uff09<\/li>\n<\/ul>\n<p>\u300cthis\u306f\u3069\u3053\u3092\u6307\u3059\u306e\u304b\uff1f\u300d\u306f<strong>\u547c\u3073\u51fa\u3057\u65b9\u3054\u3068<\/strong>\u306b\u6574\u7406\u3057\u3066\u899a\u3048\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\n    \uff08let\u3084var\u306e\u9055\u3044\u306b\u3088\u308bthis\u306e\u6df7\u4e71\u306b\u3064\u3044\u3066\u306f\u300e<a href=\"https:\/\/route-zero.com\/recruit\/route\/1345\/\">\u56f3\u89e3\u3067\u308f\u304b\u308b\uff01 JavaScript\u521d\u5fc3\u8005\u304c\u30cf\u30de\u308b let\u3068var\u306e\u9055\u3044\u3092\u5fb9\u5e95\u89e3\u8aac\uff5c\u73fe\u5834\u3067\u306e\u6ce8\u610f\u70b9\u307e\u3067\u5b8c\u5168\u5bfe\u5fdc<\/a\n    >\u300f\u3082\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\uff09\n  <\/p>\n<hr \/>\n<h2>3. \u69cb\u6587\u5225this\u306e\u9055\u3044\u3068\u4f7f\u3044\u5206\u3051\u3010\u8868\uff06\u30b3\u30fc\u30c9\u4f8b\u3011<\/h2>\n<h3>\u25a0 \u901a\u5e38\u95a2\u6570 vs \u30a2\u30ed\u30fc\u95a2\u6570\u306e\u201cthis\u201d\u9055\u3044<\/h3>\n<p><strong>\u901a\u5e38\u95a2\u6570<\/strong>\u306f\u300c\u547c\u3073\u51fa\u3057\u5143\u300d\u3001<strong>\u30a2\u30ed\u30fc\u95a2\u6570<\/strong>\u306f\u300c\u5b9a\u7fa9\u6642\u306e\u5916\u5074\u300d\u3092\u53c2\u7167\u3057\u307e\u3059\u3002<\/p>\n<blockquote>\n<p>\n      <strong>\u65e5\u5e38\u751f\u6d3b\u306e\u4f8b\u3048\uff1a<\/strong><br \/>\n      \u300c\u901a\u5e38\u95a2\u6570\u300d\u306f\u201c\u8ab0\u304c\u547c\u3076\u304b\u201d\u3067\u81ea\u5206\uff08this\uff09\u304c\u5909\u308f\u308b\u30a4\u30e1\u30fc\u30b8\u3002<br \/>\n      \u4f8b\u3048\u3070\u300c\u5bb6\u3067\u300e\u3054\u98ef\u98df\u3079\u308b\u300f\u3068\u8a00\u3048\u3070\u81ea\u5206\u306e\u5bb6\u3067\u98df\u3079\u308b\u300d\u3001\u300c\u53cb\u9054\u306e\u5bb6\u3067\u300e\u3054\u98ef\u98df\u3079\u308b\u300f\u3068\u8a00\u3048\u3070\u53cb\u9054\u306e\u5bb6\u3067\u98df\u3079\u308b\u300d\u3088\u3046\u306b\u3001\u547c\u3073\u51fa\u3057\u5143\u306b\u3088\u3063\u3066\u201c\u81ea\u5206\u201d\u304c\u5909\u308f\u308a\u307e\u3059\u3002<br \/>\n      \u4e00\u65b9\u300c\u30a2\u30ed\u30fc\u95a2\u6570\u300d\u306f\u201c\u3069\u3053\u3067\u6c7a\u3081\u305f\u304b\u201d\u304c\u57fa\u6e96\u3002<br \/>\n      \u4f8b\u3048\u3070\u300c\u304a\u6bcd\u3055\u3093\u304c\u300e\u3054\u98ef\u98df\u3079\u308b\u300f\u3068\u8a00\u3063\u305f\u3089\u3001\u3044\u3064\u8ab0\u304c\u547c\u3093\u3067\u3082\u201c\u304a\u6bcd\u3055\u3093\u201d\u304c\u3054\u98ef\u3092\u98df\u3079\u308b\u300d\u3088\u3046\u306b\u3001\u5b9a\u7fa9\u3057\u305f\u6642\u70b9\u306e\u201c\u81ea\u5206\u201d\u304c\u305a\u3063\u3068\u4f7f\u308f\u308c\u307e\u3059\u3002\n    <\/p>\n<\/blockquote>\n<pre><code>\r\nconst obj = {\r\n  value: 42,\r\n  normalFunc: function() { return this.value; },\r\n  arrowFunc: () => this.value\r\n};\r\n\/\/ obj.normalFunc() \u2192 42\r\n\/\/ obj.arrowFunc() \u2192 undefined\r\n  <\/code><\/pre>\n<p>\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3084\u30a4\u30d9\u30f3\u30c8\u30ea\u30b9\u30ca\u30fc\u3067\u306f\u3001<strong>\u30a2\u30ed\u30fc\u95a2\u6570<\/strong>\u3060\u3068this\u304c\u60f3\u5b9a\u5916\u306b\u306a\u308b\u3053\u3068\u304c\u591a\u3044\u306e\u3067\u6ce8\u610f\uff01<\/p>\n<h3>\u25a0 bind\/call\/apply\u3067this\u3092\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb<\/h3>\n<ul>\n<li><strong>bind<\/strong>\uff1athis\u3092\u201c\u56fa\u5b9a\u201d\u3057\u305f\u65b0\u3057\u3044\u95a2\u6570\u3092\u8fd4\u3059<\/li>\n<li><strong>call\/apply<\/strong>\uff1a\u305d\u306e\u5834\u3067this\u3092\u6307\u5b9a\u3057\u3066\u95a2\u6570\u5b9f\u884c\uff08\u5f15\u6570\u306e\u6e21\u3057\u65b9\u304c\u9055\u3046\uff09<\/li>\n<\/ul>\n<p>\u30a4\u30d9\u30f3\u30c8\u30ea\u30b9\u30ca\u30fc\u3067\u300cthis\u304c\u30d0\u30b0\u308b\u300d\u5834\u5408\u3001<strong>bind<\/strong>\u3067\u660e\u793a\u7684\u306b\u56fa\u5b9a\u3059\u308b\u306e\u304c\u5b9a\u756a\u306e\u5bfe\u7b56\u3067\u3059\u3002<\/p>\n<h3>\u25a0 \u30af\u30e9\u30b9\u30fb\u7d99\u627f\u30fbTypeScript\u74b0\u5883\u3067\u306ethis<\/h3>\n<p>\n    <strong>\u30af\u30e9\u30b9\uff08ES6\u4ee5\u964d\uff09<\/strong>\u3067\u306f\u3001\u901a\u5e38\u30e1\u30bd\u30c3\u30c9\u306ethis\u306f\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u81ea\u8eab\u3067\u3059\u304c\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3068\u3057\u3066\u6e21\u3059\u3068this\u304c\u5931\u308f\u308c\u308b\u3053\u3068\u304c\u3002<br \/>\n    <strong>TypeScript<\/strong>\u3067\u306fthis\u306e\u578b\u5b89\u5168\u3082\u91cd\u8981\u306a\u306e\u3067\u3001\u8a2d\u8a08\u6bb5\u968e\u304b\u3089this\u306e\u6d41\u308c\u3092\u610f\u8b58\u3057\u307e\u3057\u3087\u3046\u3002\n  <\/p>\n<p>\uff08TypeScript\u3084\u30af\u30e9\u30b9\u8a2d\u8a08\u306e\u57fa\u790e\u306b\u3064\u3044\u3066\u306f\u300e<a href=\"https:\/\/route-zero.com\/recruit\/route\/1279\">TypeScript\u3068\u306f\uff1fJavaScript\u3068\u306e\u9055\u3044\u3092\u521d\u5fc3\u8005\u5411\u3051\u306b\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac<\/a>\u300f\u3082\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\uff09<\/p>\n<hr \/>\n<h2>4. \u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u30fb\u30a4\u30d9\u30f3\u30c8\u30fb\u975e\u540c\u671f\u3067\u306ethis\u30d0\u30b0\u3068\u5bfe\u7b56<\/h2>\n<p>\u73fe\u5834\u3067\u672c\u5f53\u306b\u591a\u3044\u306e\u304c\u3001<strong>\u30b3\u30fc\u30eb\u30d0\u30c3\u30af<\/strong>\u3084setTimeout\u3001\u30a4\u30d9\u30f3\u30c8\u30ea\u30b9\u30ca\u30fc\u3067this\u304c\u5909\u5316\u3059\u308b\u30d1\u30bf\u30fc\u30f3\u3002<\/p>\n<p>\n    <strong>\u3042\u308b\u3042\u308b\u30d0\u30b0\u4f8b<\/strong>\n  <\/p>\n<ul>\n<li>setTimeout\u5185\u3067this\u304c\u30b0\u30ed\u30fc\u30d0\u30eb\u3084undefined\u306b\u306a\u308b<\/li>\n<li>\u30a4\u30d9\u30f3\u30c8\u30ea\u30b9\u30ca\u30fc\u3067this\u304c\u8981\u7d20\u4ee5\u5916\u3092\u53c2\u7167<\/li>\n<\/ul>\n<p>\n    <strong>\u89e3\u6c7a\u6cd5<\/strong>\n  <\/p>\n<ul>\n<li><strong>\u30a2\u30ed\u30fc\u95a2\u6570<\/strong>\u3067\u5916\u5074\u306ethis\u3092\u300c\u6355\u6349\u300d<\/li>\n<li><strong>bind<\/strong>\u3067this\u3092\u660e\u793a\u7684\u306b\u56fa\u5b9a<\/li>\n<li>\u30af\u30e9\u30b9\u306a\u3089constructor\u5185\u3067bind\u3092\u4ed5\u8fbc\u3080<\/li>\n<\/ul>\n<p>\u300cthis\u3092\u3069\u3053\u3067\u675f\u7e1b\u3059\u308b\u304b\uff1f\u300d\u3092\u30c1\u30fc\u30e0\u3067\u660e\u6587\u5316\u3057\u3066\u304a\u304f\u3068\u5b89\u5fc3\u3067\u3059\u3002<\/p>\n<p>\uff08\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3084\u975e\u540c\u671f\u51e6\u7406\u306e\u8a73\u7d30\u306f\u300e<a href=\"https:\/\/route-zero.com\/recruit\/route\/917\/\">JavaScript\u306e\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u304c\u308f\u304b\u3089\u306a\u3044\uff1f\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u5b9f\u4f8b\u3067\u3084\u3055\u3057\u304f\u89e3\u8aac\uff01<\/a>\u300f\u3082\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\uff09<\/p>\n<hr \/>\n<h2>5. \u53d7\u8a17\u30fbSES\u73fe\u5834\u3067\u672c\u5f53\u306b\u3042\u3063\u305fthis\u30d0\u30b0\u3068\u30ea\u30d5\u30a1\u30af\u30bf<\/h2>\n<p>\u73fe\u5834\u3067\u983b\u767a\u3059\u308b\u306e\u306f\u3001<strong>\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9<\/strong>\u3092\u30a4\u30d9\u30f3\u30c8\u30ea\u30b9\u30ca\u30fc\u306a\u3069\u306b\u305d\u306e\u307e\u307e\u6e21\u3057\u3066<strong>this\u304c\u5931\u308f\u308c\u308b<\/strong>\u30d1\u30bf\u30fc\u30f3\u3002<\/p>\n<p>\n    <strong>\u30ea\u30d5\u30a1\u30af\u30bf\u4f8b<\/strong>\n  <\/p>\n<ul>\n<li>\u8aa4\uff1abutton.addEventListener(&#8216;click&#8217;, this.handleClick);<\/li>\n<li>\u6b63\uff1abutton.addEventListener(&#8216;click&#8217;, this.handleClick.bind(this));<br \/>\u307e\u305f\u306fthis.handleClick = this.handleClick.bind(this);\u3092constructor\u3067\u5b9f\u884c<\/li>\n<\/ul>\n<p>\n    \u300c\u30a4\u30d9\u30f3\u30c8\u306b\u6e21\u3059\u3068\u304d\u306f\u5fc5\u305athis\u3092\u56fa\u5b9a\u300d<br \/>\n    \u3053\u3046\u3057\u305f\u30eb\u30fc\u30eb\u3092\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u5171\u6709\u3057\u3001\u518d\u767a\u9632\u6b62\u306b\u3064\u306a\u3052\u307e\u3057\u3087\u3046\u3002\n  <\/p>\n<hr \/>\n<h2>6. \u30c1\u30fc\u30e0\u958b\u767a\u3067\u5f79\u7acb\u3064this\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\uff06\u30ec\u30d3\u30e5\u30fc\u89b3\u70b9<\/h2>\n<p>\u30d0\u30b0\u3084\u624b\u623b\u308a\u3092\u6e1b\u3089\u3059\u305f\u3081\u3001<strong>\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc<\/strong>\u3067\u6b21\u3092\u5fc5\u305a\u30c1\u30a7\u30c3\u30af\uff01<\/p>\n<ul>\n<li>\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u30fb\u30a4\u30d9\u30f3\u30c8\u3067this\u304c\u60f3\u5b9a\u901a\u308a\u304b<\/li>\n<li><strong>\u30a2\u30ed\u30fc\u95a2\u6570\uff0f\u901a\u5e38\u95a2\u6570<\/strong>\u306e\u9078\u629e\u304c\u9069\u5207\u304b<\/li>\n<li>\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u306ethis\u304c\u201c\u5931\u308f\u308c\u3066\u201d\u3044\u306a\u3044\u304b<\/li>\n<li>TypeScript\u3067this\u306e\u578b\u304c\u5b89\u5168\u304b<\/li>\n<\/ul>\n<p>\u30ec\u30d3\u30e5\u30fc\u6642\u3001\u300c\u3053\u306e\u95a2\u6570\u306ethis\u306f\u4f55\u3092\u6307\u3057\u3066\u3044\u308b\uff1f\u300d\u3068\u30c1\u30fc\u30e0\u5185\u3067\u78ba\u8a8d\u3059\u308b\u6587\u5316\u3092\u3064\u304f\u308b\u306e\u3082\u304a\u3059\u3059\u3081\u3067\u3059\u3002<\/p>\n<hr \/>\n<h2>7. \u3088\u304f\u3042\u308b\u7591\u554fQ&#038;A<\/h2>\n<ul>\n<li><strong>Q1. JavaScript\u306ethis\u306f\u306a\u305c\u72b6\u6cc1\u3054\u3068\u306b\u5909\u308f\u308b\u306e\uff1f<\/strong><br \/>A. \u547c\u3073\u51fa\u3057\u65b9\u3054\u3068\u306bthis\u304c\u81ea\u52d5\u3067\u5909\u308f\u308b\u4ed5\u69d8\u3060\u304b\u3089\u3067\u3059\u3002<\/li>\n<li><strong>Q2. \u30a2\u30ed\u30fc\u95a2\u6570\u3067this\u304c\u60f3\u5b9a\u5916\u306b\u306a\u308b\u306e\u306f\u306a\u305c\uff1f<\/strong><br \/>A. \u30a2\u30ed\u30fc\u95a2\u6570\u306f\u5b9a\u7fa9\u6642\u306e\u5916\u5074\u30b9\u30b3\u30fc\u30d7\u306ethis\u3092\u53c2\u7167\u3057\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30e1\u30bd\u30c3\u30c9\u306b\u306f\u5411\u304d\u307e\u305b\u3093\u3002<\/li>\n<li><strong>Q3. bind\/call\/apply\u306e\u9055\u3044\u306f\uff1f<\/strong><br \/>A. bind\u306f\u65b0\u3057\u3044\u95a2\u6570\u3001call\/apply\u306f\u5373\u6642\u5b9f\u884c\u3002\u3069\u308c\u3082this\u3092\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002<\/li>\n<li><strong>Q4. \u30af\u30e9\u30b9\u7d99\u627f\u3067\u306ethis\u6ce8\u610f\u70b9\u306f\uff1f<\/strong><br \/>A. \u30e1\u30bd\u30c3\u30c9\u3092\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3067\u6e21\u3059\u3068this\u304c\u5931\u308f\u308c\u3084\u3059\u3044\u306e\u3067bind\u3084\u30a2\u30ed\u30fc\u95a2\u6570\u3067\u5de5\u592b\u3092\u3002<\/li>\n<li><strong>Q5. \u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3084setTimeout\u3067this\u304c\u5909\u308f\u308b\u7406\u7531\u306f\uff1f<\/strong><br \/>A. \u547c\u3073\u51fa\u3057\u5143\u304c\u7570\u306a\u308b\u305f\u3081\u3001this\u304c\u601d\u308f\u306c\u5024\u306b\u5909\u5316\u3057\u307e\u3059\u3002<\/li>\n<li><strong>Q6. \u30a4\u30d9\u30f3\u30c8\u30ea\u30b9\u30ca\u30fc\u3067this\u3092\u610f\u56f3\u901a\u308a\u6271\u3046\u306b\u306f\uff1f<\/strong><br \/>A. bind\u3084\u30a2\u30ed\u30fc\u95a2\u6570\u3067\u56fa\u5b9a\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\n<li><strong>Q7. \u30c1\u30fc\u30e0\u3067this\u8aa4\u7528\u3092\u6e1b\u3089\u3059\u30b3\u30c4\u306f\uff1f<\/strong><br \/>A. \u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\u3084\u30da\u30a2\u30d7\u30ed\u3001\u30ec\u30d3\u30e5\u30fc\u6642\u306e\u78ba\u8a8d\u304c\u6709\u52b9\u3067\u3059\u3002<\/li>\n<\/ul>\n<hr \/>\n<h2>\u307e\u3068\u3081\uff1athis\u8ff7\u5b50\u304b\u3089\u629c\u3051\u51fa\u3059\u305f\u3081\u306b<\/h2>\n<p>\n    <strong>this<\/strong>\u306f\u4e00\u898b\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u304c\u3001\u69cb\u6587\u3084\u5834\u9762\u3054\u3068\u306b\u53c2\u7167\u5148\u304c\u6fc0\u5909\u3057\u307e\u3059\u3002<br \/>\n    \u4eca\u56de\u3054\u7d39\u4ecb\u3057\u305f\u6bd4\u8f03\u8868\u3084\u30b3\u30fc\u30c9\u4f8b\u3001\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\u3092\u73fe\u5834\u306b\u6301\u3061\u5e30\u308a\u3001\u65e5\u3005\u306e\u958b\u767a\u3067\u300cthis\u8ff7\u5b50\u300d\u3092\u6e1b\u3089\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<br \/>\n    \u305c\u3072\u30b3\u30fc\u30c9\u3092\u30b3\u30d4\u30da\u3057\u3066\u3001\u307e\u305a\u306f\u52d5\u304b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\n  <\/p>\n<hr \/>\n<\/div>\n","protected":false},"featured_media":1768,"template":"","_links":{"self":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/route\/1765"}],"collection":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/route"}],"about":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/types\/route"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/media\/1768"}],"wp:attachment":[{"href":"https:\/\/route-zero.com\/recruit\/wp-json\/wp\/v2\/media?parent=1765"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}