{"id":10098,"date":"2025-12-04T19:30:23","date_gmt":"2025-12-04T10:30:23","guid":{"rendered":"https:\/\/techmania.jp\/blog\/?p=10098"},"modified":"2025-12-04T19:30:25","modified_gmt":"2025-12-04T10:30:25","slug":"javascript-function","status":"publish","type":"post","link":"https:\/\/techmania.jp\/blog\/javascript-function\/","title":{"rendered":"\u3010JavaScript\u5165\u9580\u3011\u95a2\u6570\uff08function\uff09\u306e\u4f7f\u3044\u65b9\u7dcf\u307e\u3068\u3081\uff01\u5f15\u6570\u30fb\u623b\u308a\u5024\u30fb\u30a2\u30ed\u30fc\u95a2\u6570\u306a\u3069\u3092\u5fb9\u5e95\u89e3\u8aac"},"content":{"rendered":"\n<p>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u3059\u308b\u4e0a\u3067\u5fc5\u9808\u3068\u306a\u308b\u6a5f\u80fd\u306e\uff11\u3064\u306b\u3001\u95a2\u6570\u304c\u3042\u308a\u307e\u3059\u3002<br>\u65e2\u5b58\u3067\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u30e1\u30bd\u30c3\u30c9\u306a\u3069\u3082\u542b\u3081\u3001\u95a2\u6570\u306f\u5207\u3063\u3066\u3082\u5207\u308a\u96e2\u305b\u306a\u3044\u91cd\u8981\u306a\u6a5f\u80fd\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3051\u308b\u57fa\u672c\u7684\u306a\u6a5f\u80fd\u3067\u3042\u308a\u306a\u304c\u3089\u3001\u4f7f\u7528\u3059\u308b\u8a00\u8a9e\u306b\u3088\u3063\u3066\u95a2\u6570\u306e\u66f8\u304d\u65b9\u3084\u632f\u308b\u821e\u3044\u306f\u69d8\u3005\u3067\u3059\u3002<br>\u305d\u3053\u3067\u4eca\u56de\u306f\u3001JavaScript\u306b\u304a\u3051\u308b\u95a2\u6570\u306e\u4e3b\u306a\u4ed5\u69d8\u3084\u4f7f\u3044\u65b9\u306a\u3069\u306b\u3064\u3044\u3066\u3001\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u95a2\u6570\u3092\u6271\u3046\u4e0a\u3067\u95a2\u9023\u6027\u306e\u9ad8\u3044 this \u30ad\u30fc\u30ef\u30fc\u30c9\u3084\u30b9\u30b3\u30fc\u30d7\u306a\u3069\u306b\u3064\u3044\u3066\u3082\u89e3\u8aac\u3059\u308b\u306e\u3067\u3001\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h2 id=\"outline__1\" class=\"wp-block-heading\">\u95a2\u6570\uff08function\uff09\u3068\u306f\uff1f<\/h2>\n\n\n\n<p>\u95a2\u6570(function)\u3068\u306f\u3001\u95a2\u9023\u3059\u308b\u8907\u6570\u306e\u51e6\u7406\u30921\u3064\u306b\u307e\u3068\u3081\u3001\u540d\u524d\u3092\u4ed8\u3051\u3066\u7ba1\u7406\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u6a5f\u80fd\u306e\u3053\u3068\u3092\u8a00\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5ba3\u8a00\u3057\u305f\u95a2\u6570\u306f\u3001\u95a2\u6570\u540d\u3092\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u69d8\u3005\u306a\u5834\u6240\u304b\u3089\u7e70\u308a\u8fd4\u3057\u547c\u3073\u51fa\u3057\u53ef\u80fd\u3068\u306a\u308a\u307e\u3059\u3002<br>\u305d\u306e\u305f\u3081\u3001\u8907\u6570\u7b87\u6240\u3067\u5171\u901a\u3059\u308b\u51e6\u7406\u306a\u3069\u3092\u95a2\u6570\u3068\u3057\u3066\u307e\u3068\u3081\u308b\u3053\u3068\u3067\u3001\u8a18\u8ff0\u3059\u308b\u30b3\u30fc\u30c9\u306e\u91cf\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u51e6\u7406\u5185\u5bb9\u306e\u4fee\u6b63\u3084\u8ffd\u52a0\u304c\u5fc5\u8981\u306b\u306a\u3063\u305f\u969b\u306b\u3082\u3001\u95a2\u6570\u5185\u306e\u30b3\u30fc\u30c9\u3092\u5909\u66f4\u3059\u308b\u3060\u3051\u3067\u6e08\u3080\u3088\u3046\u306b\u306a\u308b\u305f\u3081\u3001\u4f5c\u696d\u306e\u52b9\u7387\u6027\u3084\u5b89\u5168\u6027\u3092\u9ad8\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__2\" class=\"wp-block-heading\">function \u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<p>JavaScript\u3067\u95a2\u6570\u3092\u5b9a\u7fa9\u3059\u308b\u65b9\u6cd5\u306f\u3001\u4e3b\u306b\u4ee5\u4e0b\u306e3\u3064\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u95a2\u6570\u5ba3\u8a00<\/li>\n\n\n\n<li>\u95a2\u6570\u5f0f<\/li>\n\n\n\n<li>\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf<\/li>\n<\/ul>\n\n\n\n<p>\u305d\u308c\u305e\u308c\u306e\u5b9a\u7fa9\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 id=\"outline__2_1\" class=\"wp-block-heading\">function \u30ad\u30fc\u30ef\u30fc\u30c9\u3067\u95a2\u6570\u3092\u5ba3\u8a00\u3059\u308b<\/h3>\n\n\n\n<p>1\u3064\u76ee\u306f\u3001\u95a2\u6570\u5ba3\u8a00\u306b\u3088\u3063\u3066\u5b9a\u7fa9\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002<br>\u5b9a\u7fa9\u3059\u308b\u969b\u306e\u57fa\u672c\u69cb\u6587\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function \u95a2\u6570\u540d(\u5f15\u65701, \u5f15\u65702, \u2026) {\n    \/\/\u51e6\u7406\u5185\u5bb9\n}<\/code><\/pre><\/div>\n\n\n\n<p>function\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u5f8c\u306b\u95a2\u6570\u540d\u3092\u8a18\u8ff0\u3057\u3001()\u5185\u306b\u95a2\u6570\u306b\u6e21\u3057\u305f\u3044\u5f15\u6570\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002(\u5fc5\u8981\u306a\u3044\u5834\u5408\u306f()\u306e\u307f\u8a18\u8ff0)<br>{} \u306e\u30d6\u30ed\u30c3\u30af\u5185\u306b\u95a2\u6570\u3068\u3057\u3066\u307e\u3068\u3081\u305f\u3044\u51e6\u7406\u3092\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u3001\u5bfe\u8c61\u306e\u95a2\u6570\u3092\u547c\u3073\u51fa\u3057\u305f\u969b\u306b\u305d\u306e\u5185\u5bb9\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u95a2\u6570\u5ba3\u8a00\u306b\u306e\u307f\u9069\u7528\u3055\u308c\u308b\u4ed5\u69d8\u3068\u3057\u3066\u3001\u5b9a\u7fa9\u3057\u305f\u95a2\u6570\u306e\u5185\u5bb9\u304c\u5dfb\u304d\u4e0a\u3052 (\u30db\u30a4\u30b9\u30c6\u30a3\u30f3\u30b0) \u3055\u308c\u308b\u3068\u3044\u3046\u5927\u304d\u306a\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30db\u30a4\u30b9\u30c6\u30a3\u30f3\u30b0\u3068\u306f\u3001\u95a2\u6570\u3084\u5909\u6570\u306a\u3069\u306e\u5ba3\u8a00\u30bf\u30a4\u30df\u30f3\u30b0\u304c\u3001\u30b3\u30fc\u30c9\u306e\u5b9f\u884c\u524d\u306b\u81ea\u52d5\u3067\u5148\u982d\u3078\u3068\u79fb\u52d5\u3055\u308c\u308b\u4ed5\u69d8\u306e\u3053\u3068\u3092\u8a00\u3044\u307e\u3059\u3002<br>\u30db\u30a4\u30b9\u30c6\u30a3\u30f3\u30b0\u306b\u4f34\u3046\u5909\u6570\u3084\u95a2\u6570\u306e\u632f\u308b\u821e\u3044\u306f\u5ba3\u8a00\u65b9\u6cd5\u306b\u3088\u3063\u3066\u7570\u306a\u308a\u307e\u3059\u304c\u3001\u95a2\u6570\u5ba3\u8a00\u306e\u5834\u5408\u306f\u5b9a\u7fa9\u5185\u5bb9\u5168\u3066\u304c\u5ba3\u8a00\u3068\u3068\u3082\u306b\u30db\u30a4\u30b9\u30c6\u30a3\u30f3\u30b0\u3055\u308c\u308b\u305f\u3081\u3001\u5ba3\u8a00\u30bf\u30a4\u30df\u30f3\u30b0\u306b\u95a2\u308f\u3089\u305a\u30b3\u30fc\u30c9\u306e\u3069\u306e\u4f4d\u7f6e\u304b\u3089\u3067\u3082\u547c\u3073\u51fa\u3057\u3066\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__2_2\" class=\"wp-block-heading\">\u95a2\u6570\u5f0f\u3067\u95a2\u6570\u3092\u5b9a\u7fa9\u3059\u308b<\/h3>\n\n\n\n<p>2\u3064\u76ee\u306f\u3001\u95a2\u6570\u5f0f(\u95a2\u6570\u30ea\u30c6\u30e9\u30eb) \u3067\u5b9a\u7fa9\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u95a2\u6570\u5f0f\u3068\u306f\u3001\u95a2\u6570\u3092\u5909\u6570\u306b\u4ee3\u5165\u3059\u308b\u5024\u3068\u3057\u3066\u6271\u3046\u5f0f\u306e\u3053\u3068\u3092\u8a00\u3044\u307e\u3059\u3002<br>JavaScript\u306b\u304a\u3044\u3066\u306f\u3001\u95a2\u6570\u3082\u30c7\u30fc\u30bf\u578b\u306e1\u3064\u3067\u3042\u308b\u305f\u3081\u3001\u5909\u6570\u306b\u4ee3\u5165\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u95a2\u6570\u5f0f\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5f62\u5f0f\u3067\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const sample = function(\u5f15\u65701, \u5f15\u65702) {\n    \/\/ \u51e6\u7406\u5185\u5bb9\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u57fa\u672c\u69cb\u6587\u306f\u95a2\u6570\u5ba3\u8a00\u3068\u307b\u3068\u3093\u3069\u540c\u3058\u66f8\u304d\u65b9\u3092\u3057\u307e\u3059\u304c\u3001\u95a2\u6570\u5f0f\u306e\u5834\u5408\u306f\u95a2\u6570\u540d\u3092\u8a18\u8ff0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u305b\u3093\u3002<br>\u305f\u3060\u3057\u3001\u4efb\u610f\u3067\u95a2\u6570\u540d\u3092\u4ed8\u3051\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3001\u305d\u306e\u5834\u5408\u306f\u30d6\u30ed\u30c3\u30af\u5185\u3067\u306e\u307f\u81ea\u8eab\u3092\u547c\u3073\u51fa\u3059\u305f\u3081\u306e\u95a2\u6570\u540d\u3068\u3057\u3066\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const hoge = function fuga() {\n    fuga(); \/\/ \u4f7f\u7528\u53ef\u80fd\n}\n\nfuga(); \/\/ \u4f7f\u7528\u4e0d\u53ef\u3001\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b<\/code><\/pre><\/div>\n\n\n\n<p>\u307e\u305f\u3001\u95a2\u6570\u5f0f\u306e\u5834\u5408\u306f\u5b9a\u7fa9\u5185\u5bb9\u306e\u5dfb\u304d\u4e0a\u3052\u304c\u884c\u308f\u308c\u306a\u3044\u305f\u3081\u3001\u5ba3\u8a00\u6642\u3088\u308a\u524d\u306e\u5834\u6240\u3067\u5909\u6570\u3092\u547c\u3073\u51fa\u3057\u305f\u5834\u5408\u306b\u306f\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__2_3\" class=\"wp-block-heading\">Function() \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30fc\u3067\u95a2\u6570\u3092\u5b9a\u7fa9\u3059\u308b<\/h3>\n\n\n\n<p>3\u3064\u76ee\u306f\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u4f7f\u7528\u3057\u3066\u5b9a\u7fa9\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u5148\u307b\u3069\u89e3\u8aac\u3057\u305f\u3088\u3046\u306b\u3001JavaScript\u306b\u304a\u3051\u308b\u95a2\u6570\u306f\u4e00\u7a2e\u306e\u30c7\u30fc\u30bf\u578b\u306e\u305f\u3081\u3001Function\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u7d4c\u7531\u3057\u3066\u95a2\u6570\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u305d\u306e\u5834\u5408\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const sample = new Function(\u5f15\u65701, \u5f15\u65702, \u2026, \u51e6\u7406\u5185\u5bb9)<\/code><\/pre><\/div>\n\n\n\n<p>\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e\u5f15\u6570\u306e\u672b\u5c3e\u306b\u6e21\u3057\u305f\u5024\u304c\u95a2\u6570\u306e\u51e6\u7406\u5185\u5bb9\u3068\u306a\u308a\u3001\u305d\u308c\u4ee5\u524d\u306b\u6e21\u3057\u305f\u5024\u306f\u5b9a\u7fa9\u3059\u308b\u95a2\u6570\u306e\u4eee\u5f15\u6570\u540d\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u4f7f\u7528\u3057\u3066\u751f\u6210\u3055\u308c\u305f Function\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001\u95a2\u6570\u304c\u8a55\u4fa1\u3055\u308c\u308b\u3054\u3068\u306b\u69cb\u6587\u89e3\u6790\u304c\u884c\u308f\u308c\u308b\u95a2\u4fc2\u4e0a\u3001\u89e3\u6790\u3055\u308c\u308b\u306e\u304c\u4e00\u5ea6\u306e\u307f\u3067\u3042\u308b\u95a2\u6570\u5ba3\u8a00\u3084\u95a2\u6570\u5f0f\u3068\u6bd4\u3079\u3066\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u843d\u3061\u308b\u50be\u5411\u306b\u3042\u308a\u307e\u3059\u3002<br>\u305d\u306e\u305f\u3081\u3001\u57fa\u672c\u7684\u306b\u306f\u4f7f\u7528\u3092\u306a\u308b\u3079\u304f\u907f\u3051\u305f\u65b9\u304c\u826f\u3044\u3068\u3055\u308c\u308b\u65b9\u6cd5\u3067\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__3\" class=\"wp-block-heading\">\u95a2\u6570\uff08function\uff09\u306e\u66f8\u304d\u65b9<\/h2>\n\n\n\n<p>\u305d\u308c\u3067\u306f\u3001\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u3092\u3082\u3068\u306b\u3001\u5b9f\u969b\u306e\u5b9a\u7fa9\u65b9\u6cd5\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 id=\"outline__3_1\" class=\"wp-block-heading\">\u57fa\u672c\u7684\u306a\u95a2\u6570\u5b9a\u7fa9\u306e\u4f8b<\/h3>\n\n\n\n<p>\u307e\u305a\u306f\u3001\u95a2\u6570\u5ba3\u8a00\u3067\u5b9a\u7fa9\u3059\u308b\u4f8b\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sample() {\n    const numX = 5;\n    const numY = 10;\n    console.log(numX + numY);\n}<\/code><\/pre><\/div>\n\n\n\n<p>function\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u5192\u982d\u306b\u8a18\u8ff0\u3057\u3001\u305d\u306e\u5f8c\u308d\u306b\u95a2\u6570\u540d\u3092\u7d9a\u3051\u3066\u8a18\u8ff0\u3057\u307e\u3059\u3002<br>\u305d\u306e\u305f\u3081\u3001\u4e0a\u8a18\u306e\u95a2\u6570\u3092\u5b9f\u884c\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u300csample\u300d \u306e\u540d\u524d\u3067\u95a2\u6570\u3092\u547c\u3073\u51fa\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u547c\u3073\u51fa\u3057\u305f\u969b\u306b\u5b9f\u884c\u3055\u308c\u308b\u306e\u306f {}\u30d6\u30ed\u30c3\u30af\u306e\u4e2d\u306b\u8a18\u8ff0\u3057\u305f\u51e6\u7406\u306a\u306e\u3067\u3001\u3053\u306e\u5834\u5408\u306f const numX \u2026 \u304b\u3089 console.log \u2026 \u307e\u3067\u306e\u884c\u304c\u5b9f\u969b\u306b\u5b9f\u884c\u3055\u308c\u308b\u51e6\u7406\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4e0a\u8a18\u306e\u4f8b\u3092\u3001\u4eca\u5ea6\u306f\u95a2\u6570\u5f0f\u3067\u5b9a\u7fa9\u3059\u308b\u5834\u5408\u3067\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const sample = function() {\n    const numX = 5;\n    const numY = 10;\n    console.log(numX + numY);\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u3053\u3046\u3057\u3066\u898b\u6bd4\u3079\u3066\u307f\u308b\u3068\u3001\u69cb\u6587\u3068\u3057\u3066\u306f\u307b\u3068\u3093\u3069\u5909\u308f\u308a\u304c\u306a\u3044\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002<br>\u95a2\u6570\u5f0f\u306e\u5834\u5408\u306f\u5909\u6570\u540d\u3092\u4f7f\u7528\u3057\u3066\u547c\u3073\u51fa\u3059\u306e\u3067\u3001\u3053\u306e\u4f8b\u306e\u5834\u5408\u3082 sample \u306e\u540d\u524d\u3067\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__3_2\" class=\"wp-block-heading\">ES2015\u3067\u5c0e\u5165\u3055\u308c\u305f\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u306b\u3064\u3044\u3066<\/h3>\n\n\n\n<p>\u95a2\u6570\u5f0f\u3067\u5b9a\u7fa9\u3059\u308b\u5834\u5408\u306f\u3001ES2015\u3088\u308a\u5c0e\u5165\u3055\u308c\u305f \u300c\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u300d \u3068\u3044\u3046\u8a18\u8ff0\u65b9\u6cd5\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u3092\u3088\u308a\u7c21\u6f54\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u306e\u57fa\u672c\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const sample = (\u5f15\u65701, \u5f15\u65702) =&gt; {\n    \/\/\u51e6\u7406\u5185\u5bb9\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u306e\u7279\u5fb4\u306e\uff11\u3064\u3068\u3057\u3066\u3001function \u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u4ee3\u308f\u308a\u306b \u300c=&gt;\u300d \u3092\u4f7f\u7528\u3057\u3066\u95a2\u6570\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<br>\u4e0a\u8a18\u306e\u4f8b\u306e\u5834\u5408\u306f\u3001\u901a\u5e38\u306e\u95a2\u6570\u5f0f\u3068\u8a18\u8ff0\u91cf\u306f\u5927\u304d\u304f\u5909\u308f\u308a\u307e\u305b\u3093\u304c\u3001\u30b1\u30fc\u30b9\u306b\u3088\u308a\u3053\u3053\u304b\u3089\u3055\u3089\u306b\u7c21\u6f54\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305a\u3001\u5f15\u6570\u304c\uff11\u3064\u306e\u307f\u306e\u5834\u5408\u306f () \u3092\u7701\u7565\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const sample = \u5f15\u65701 =&gt; {\n    \/\/\u51e6\u7406\u5185\u5bb9\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u307e\u305f\u3001\u51e6\u7406\u5185\u5bb9\u306e\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u304c\uff11\u3064\u306e\u307f\u306e\u5834\u5408\u306f\u3001 {} \u3092\u7701\u7565\u3057\u3066\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u57fa\u672c\u69cb\u6587\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const sample = () =&gt; \u51e6\u7406\u5185\u5bb9;<\/code><\/pre><\/div>\n\n\n\n<p>\u95a2\u6570\u3067\u623b\u308a\u5024\u3092\u6307\u5b9a\u3059\u308b\u969b\u306f return\u6587\u304c\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059\u304c (\u5f8c\u307b\u3069\u89e3\u8aac\u3057\u307e\u3059)\u3001{} \u3092\u7701\u7565\u3057\u305f\u5834\u5408\u306f\u51e6\u7406\u7d50\u679c\u304c\u305d\u306e\u307e\u307e\u623b\u308a\u5024\u3068\u306a\u308b\u305f\u3081\u3001return\u6587\u306e\u8a18\u8ff0\u3082\u4e0d\u8981\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u8a18\u8ff0\u65b9\u6cd5\u3067\u3001\u5148\u307b\u3069\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u66f8\u304d\u63db\u3048\u3066\u307f\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5185\u5bb9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const sample = () =&gt; {\n    const numX = 5;\n    const numY = 10;\n    console.log(numX + numY);\n}<\/code><\/pre><\/div>\n\n\n\n<h2 id=\"outline__4\" class=\"wp-block-heading\">\u5b9a\u7fa9\u3057\u305f\u95a2\u6570\u3092\u547c\u3073\u51fa\u3059<\/h2>\n\n\n\n<p>\u95a2\u6570\u306e\u5b9a\u7fa9\u304c\u5b8c\u4e86\u3057\u305f\u3089\u3001\u5f8c\u306f\u4f7f\u7528\u3057\u305f\u3044\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u547c\u3073\u51fa\u3057\u3092\u884c\u3046\u3060\u3051\u3068\u306a\u308a\u307e\u3059\u3002<br>\u4eca\u5ea6\u306f\u3001\u5b9a\u7fa9\u3057\u305f\u95a2\u6570\u3092\u547c\u3073\u51fa\u3059\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 id=\"outline__4_1\" class=\"wp-block-heading\">\u57fa\u672c\u7684\u306a\u95a2\u6570\u306e\u547c\u3073\u51fa\u3057<\/h3>\n\n\n\n<p>\u95a2\u6570\u3092\u547c\u3073\u51fa\u3059\u65b9\u6cd5\u306f\u7c21\u5358\u3067\u3001\u5b9a\u7fa9\u3057\u305f\u95a2\u6570\u540d\u3001\u3082\u3057\u304f\u306f\u95a2\u6570\u3092\u4ee3\u5165\u3057\u305f\u5909\u6570\u540d\u3092\u4f7f\u7528\u3057\u305f\u3044\u5834\u6240\u306b\u8a18\u8ff0\u3059\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sampleFunc() {\n    console.log(&quot;Hello, World!&quot;);\n}\n\nsampleFunc();<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>Hello, World!<\/code><\/pre><\/div>\n\n\n\n<p>\u5b9a\u7fa9\u3057\u305f \u300csampleFunc\u300d \u306e\u540d\u524d\u3092\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u3001\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002<br>\u5f15\u6570\u304c\u306a\u3044\u5834\u5408\u306f\u3001\u4e0a\u8a18\u306e\u3088\u3046\u306b\u540d\u524d\u306e\u5f8c\u308d\u306b () \u306e\u307f\u3092\u8a18\u8ff0\u3057\u3001\u5f15\u6570\u304c\u3042\u308b\u5834\u5408\u306f () \u306e\u4e2d\u306b\u6e21\u3059\u5024\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u95a2\u6570\u3092\u547c\u3073\u51fa\u3059\u969b\u306f\u3001\u5b9a\u7fa9\u65b9\u6cd5\u306b\u3088\u3063\u3066\u8a18\u8ff0\u5834\u6240\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<br>\u4e0a\u8ff0\u3057\u305f\u3088\u3046\u306b\u3001\u30db\u30a4\u30b9\u30c6\u30a3\u30f3\u30b0\u306e\u5f71\u97ff\u7bc4\u56f2\u304c\u305d\u308c\u305e\u308c\u7570\u306a\u308b\u305f\u3081\u3001\u30b1\u30fc\u30b9\u306b\u3088\u308a\u30a8\u30e9\u30fc\u306b\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u4ee5\u4e0b\u306e\u4f8b\u306f\u3001\u95a2\u6570\u5ba3\u8a00\u306e\u5834\u5408\u306f\u554f\u984c\u306a\u304f\u95a2\u6570\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u95a2\u6570\u5f0f\u3067\u5b9a\u7fa9\u3057\u305f\u5834\u5408\u306f\u30a8\u30e9\u30fc\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>\/\/ \u95a2\u6570\u5ba3\u8a00\u306e\u5834\u5408\n\nsample1(); \/\/ \u5b9f\u884c\u53ef\u80fd\n\nfunction sample1() {\n    console.log(&quot;Hello, World!&quot;);\n}\n\n\/\/ \u95a2\u6570\u5f0f\u306e\u5834\u5408\nsample2(); \/\/ \u30a8\u30e9\u30fc\u767a\u751f\n\nconst sample2 = function() {\n    console.log(&quot;Hello, World!&quot;);\n}<\/code><\/pre><\/div>\n\n\n\n<h3 id=\"outline__4_2\" class=\"wp-block-heading\">\u30da\u30fc\u30b8\u5185\u306e\u30a4\u30d9\u30f3\u30c8\u306b\u5fdc\u3058\u3066\u547c\u3073\u51fa\u3059<\/h3>\n\n\n\n<p>JavaScript\u306e\u5834\u5408\u306f\u3001\u30da\u30fc\u30b8\u306e\u8aad\u307f\u8fbc\u307f\u3084\u30dc\u30bf\u30f3\u30af\u30ea\u30c3\u30af\u306a\u3069\u3001\u30da\u30fc\u30b8\u4e0a\u3067\u767a\u751f\u3057\u305f\u30a4\u30d9\u30f3\u30c8\u306b\u5bfe\u3057\u3066\u95a2\u6570\u306e\u547c\u3073\u51fa\u3057\u3092\u884c\u3046\u5834\u5408\u3082\u591a\u3005\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30da\u30fc\u30b8\u5185\u30a4\u30d9\u30f3\u30c8\u306b\u5fdc\u3058\u3066\u547c\u3073\u51fa\u3059\u65b9\u6cd5\u306b\u3064\u3044\u3066\u3001\u3053\u3061\u3089\u3082\u7c21\u5358\u306a\u4f8b\u3092\u3082\u3068\u306b\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h4 id=\"outline__4_2_1\" class=\"wp-block-heading\">\u30af\u30ea\u30c3\u30af\u3057\u305f\u3068\u304d\u306b\u547c\u3073\u51fa\u3059<\/h4>\n\n\n\n<p>\u7279\u5b9a\u306e\u30a4\u30d9\u30f3\u30c8\u306b\u5bfe\u3057\u3066\u95a2\u6570\u3092\u5b9f\u884c\u3055\u305b\u305f\u3044\u5834\u5408\u306b\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u306e\u304c\u3001addEventListner\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305a\u306f\u3001\u5bfe\u8c61\u306e\u8981\u7d20\u3092\u30af\u30ea\u30c3\u30af\u3057\u305f\u5834\u5408\u306b\u95a2\u6570\u3092\u5b9f\u884c\u3059\u308b\u7c21\u5358\u306a\u4f8b\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const btn = document.getElementById(&quot;btn&quot;);\n\nbtn.addEventListener(&quot;click&quot;, btnClickFunction);\n\nfunction btnClickFunction() {\n  console.log(&#39;\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u307e\u3057\u305f&#39;);\n}<\/code><\/pre><\/div>\n\n\n\n<p>addEventListner\u3067\u5b9f\u884c\u3059\u308b\u95a2\u6570\u3092\u7d10\u4ed8\u3051\u308b\u5834\u5408\u306f\u3001\u307e\u305a\u521d\u3081\u306b getElementById\u306a\u3069\u3067\u5bfe\u8c61\u306e\u8981\u7d20\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<br>\u305d\u306e\u8981\u7d20\u306b\u5bfe\u3057\u3066 addEventListner \u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30a4\u30d9\u30f3\u30c8\u304c\u767a\u751f\u3057\u305f\u969b\u306b\u95a2\u6570\u304c\u5b9f\u884c\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>addEventListner\u3067\u306f\u3001\u69d8\u3005\u306a\u7a2e\u985e\u306e\u30a4\u30d9\u30f3\u30c8\u3092\u5f15\u6570\u306b\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u4eca\u56de\u306f\u8981\u7d20\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u305f\u5834\u5408\u306b\u95a2\u6570\u3092\u5b9f\u884c\u3057\u305f\u3044\u306e\u3067\u3001\u300cclick\u300d \u30a4\u30d9\u30f3\u30c8\u3092\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h4 id=\"outline__4_2_2\" class=\"wp-block-heading\">\u30da\u30fc\u30b8\u3092\u8aad\u307f\u8fbc\u3093\u3060\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u547c\u3073\u51fa\u3059<\/h4>\n\n\n\n<p>\u30b1\u30fc\u30b9\u306b\u3088\u3063\u3066\u306f\u3001\u30da\u30fc\u30b8\u304c\u8aad\u307f\u8fbc\u307e\u308c\u305f\u969b\u306b\u4f55\u304b\u3057\u3089\u306e\u51e6\u7406\u3092\u5b9f\u884c\u3057\u305f\u3044\u5834\u5408\u3082\u3042\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u3002<br>\u305d\u306e\u969b\u3082\u3001addEventListner\u3092\u4f7f\u7528\u3057\u3066\u95a2\u6570\u3092\u5b9f\u884c\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>window.addEventListener(&quot;DOMContentLoaded&quot;, loadFunction);\n\nfunction loadFunction() {\n  console.log(&#39;\u30da\u30fc\u30b8\u304c\u8aad\u307f\u8fbc\u307e\u308c\u307e\u3057\u305f&#39;);\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u30da\u30fc\u30b8\u306e\u8aad\u307f\u8fbc\u307f\u306b\u95a2\u3059\u308b\u30a4\u30d9\u30f3\u30c8\u306b\u95a2\u6570\u3092\u7d10\u4ed8\u3051\u305f\u3044\u5834\u5408\u306f\u3001window\u306b\u5bfe\u3057\u3066addEventListener\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<br>\u6307\u5b9a\u3067\u304d\u308b\u30a4\u30d9\u30f3\u30c8\u306f\u4e3b\u306b\uff12\u3064\u3042\u308a\u3001\u305d\u308c\u305e\u308c\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DOMContentLoaded \u2026 DOM\u30c4\u30ea\u30fc\u69cb\u7bc9\u5b8c\u4e86\u6642\u306b\u547c\u3073\u51fa\u3057<\/li>\n\n\n\n<li>loaded \u2026 DOM\u30c4\u30ea\u30fc\u69cb\u7bc9\u5b8c\u4e86\u5f8c\u3001\u753b\u50cf\u306a\u3069\u306e\u8aad\u8fbc\u304c\u5168\u3066\u5b8c\u4e86\u3057\u305f\u5f8c\u306b\u547c\u3073\u51fa\u3057<\/li>\n<\/ul>\n\n\n\n<p>\u547c\u3073\u51fa\u3057\u30bf\u30a4\u30df\u30f3\u30b0\u3068\u3057\u3066\u306f DOMContentLoaded\u304c\u5148\u3068\u306a\u308b\u305f\u3081\u3001\u753b\u50cf\u306a\u3069\u306e\u8aad\u307f\u8fbc\u307f\u3092\u5f85\u3064\u5fc5\u8981\u304c\u306a\u3044\u5834\u5408\u306f\u3001DOMContentLoaded\u3092\u4f7f\u7528\u3059\u308b\u65b9\u304c\u51e6\u7406\u3092\u901f\u304f\u6e08\u307e\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__5\" class=\"wp-block-heading\">\u95a2\u6570\u306b\u5f15\u6570\u3092\u8a2d\u5b9a\u3059\u308b<\/h2>\n\n\n\n<p>\u95a2\u6570\u306f\u3001\u5f15\u6570\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u30d6\u30ed\u30c3\u30af\u5185\u3067\u4f7f\u7528\u3059\u308b\u5024\u3092\u95a2\u6570\u5916\u304b\u3089\u6e21\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u8a18\u8ff0\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 id=\"outline__5_1\" class=\"wp-block-heading\">\u57fa\u672c\u69cb\u6587<\/h3>\n\n\n\n<p>\u307e\u305a\u306f\u3001\u95a2\u6570\u5ba3\u8a00\u3067\u5f15\u6570\u3092\u8a2d\u5b9a\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sampleFunction(numX, numY) {\n    const result = numX + numY;\n    console.log(result);\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u5f15\u6570\u3092\u8a2d\u5b9a\u3059\u308b\u969b\u306f\u3001()\u5185\u306b\u5fc5\u8981\u306a\u6570\u306e\u5206\u3060\u3051\u30ab\u30f3\u30de\u3067\u533a\u5207\u3063\u3066\u3001\u5f15\u6570\u540d\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<br>\u8a2d\u5b9a\u3057\u305f\u5f15\u6570\u306f\u3001\u8a18\u8ff0\u3057\u305f\u540d\u524d\u3067\u95a2\u6570\u306e\u30d6\u30ed\u30c3\u30af\u5185\u3067\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u95a2\u6570\u5f0f\u306e\u5834\u5408\u3082\u57fa\u672c\u306f\u540c\u3058\u3067\u3059\u304c\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u3067\u8a18\u8ff0\u3059\u308b\u5834\u5408\u306f\u4e0a\u8ff0\u3057\u305f\u3088\u3046\u306b\u3001\u5f15\u6570\u306e\u6570\u306b\u3088\u3063\u3066\u66f8\u304d\u65b9\u304c\u7570\u306a\u308a\u307e\u3059\u3002<br>\u305d\u308c\u305e\u308c\u306e\u66f8\u304d\u65b9\u306b\u3064\u3044\u3066\u4ee5\u4e0b\u306e\u4f8b\u3067\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>\/\/ \u57fa\u672c\u69cb\u6587\nconst sampleFunction = function(numX, numY) {\n    const result = numX + numY;\n    console.log(result);\n}\n\n\/\/ \u30a2\u30ed\u30fc\u95a2\u6570\u3001\u5f15\u6570\u304c1\u3064\u306e\u5834\u5408\nconst sampleFunction = numX =&gt; {\n    const result = numX + 10;\n    console.log(result);\n}\n\n\/\/ \u30a2\u30ed\u30fc\u95a2\u6570\u3001\u5f15\u6570\u304c2\u3064\u4ee5\u4e0a\u306e\u5834\u5408\nconst sampleFunction = (numX, numY) =&gt; {\n    const result = numX + numY;\n    console.log(result);\n}<\/code><\/pre><\/div>\n\n\n\n<h3 id=\"outline__5_2\" class=\"wp-block-heading\">\u5f15\u6570\u306b\u5024\u3092\u6e21\u3059<\/h3>\n\n\n\n<p>\u95a2\u6570\u306b\u5f15\u6570\u3092\u8a2d\u5b9a\u3057\u305f\u5834\u5408\u306f\u3001\u547c\u3073\u51fa\u3057\u6642\u306b\u5b9f\u969b\u306b\u4f7f\u7528\u3059\u308b\u5024\uff08\u5b9f\u5f15\u6570\uff09\u3092\u6e21\u3057\u307e\u3059\u3002<br>\u4ee5\u4e0b\u306e\u4f8b\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sampleFunction(numX, numY) {\n    const result = numX + numY;\n    console.log(result);\n}\n\nsampleFunction(5, 10);<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>15<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u5f15\u6570\u30922\u3064\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u547c\u3073\u51fa\u3057\u306e\u969b\u306b\u5024\u30922\u3064\u3001()\u5185\u306b\u8a18\u8ff0\u3057\u3066\u95a2\u6570\u306b\u6e21\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>JavaScript\u306f\u5909\u6570\u3084\u5f15\u6570\u3067\u578b\u3092\u5ba3\u8a00\u3059\u308b\u3053\u3068\u304c\u7121\u3044\u305f\u3081\u3001\u95a2\u6570\u306b\u5f15\u6570\u3092\u6e21\u3059\u969b\u306f\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<br>\u6e21\u3059\u5024\u306e\u30c7\u30fc\u30bf\u578b\u3088\u3063\u3066\u306f\u3001\u60f3\u5b9a\u3057\u306a\u3044\u52d5\u4f5c\u3092\u3059\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u3001\u5148\u307b\u3069\u306e\u30b3\u30fc\u30c9\u306f\u672c\u6765\u30012\u3064\u306e\u6570\u5024\u3092\u8db3\u3057\u3066\u305d\u306e\u7d50\u679c\u3092\u6c42\u3081\u308b\u95a2\u6570\u3067\u3057\u305f\u304c\u3001\u6570\u5024\u4ee5\u5916\u306e\u5024\u3092\u6e21\u3057\u305f\u5834\u5408\u306b\u6b63\u78ba\u306a\u7d50\u679c\u3092\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>sampleFunction(\u2018Hello\u2019, 10); \/\/ \u6570\u5024\u3067\u306f\u306a\u304f\u6587\u5b57\u5217\u3068\u3057\u3066\u51e6\u7406\u3055\u308c\u308b<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>Hello10<\/code><\/pre><\/div>\n\n\n\n<p>\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u3001\u4e8b\u524d\u306e\u578b\u30c1\u30a7\u30c3\u30af\u306a\u3069\u3092\u884c\u3046\u3068\u3001\u5b89\u5168\u306b\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sampleFunction(numX, numY) {\n    if(typeof numX === &#39;number&#39; && typeof numY === &#39;number&#39;) {\n        const result = numX + numY;\n        console.log(result);\n    } else {\n        console.log(&#39;\u6570\u5024\u4ee5\u5916\u306e\u5024\u304c\u6e21\u3055\u308c\u3066\u3044\u307e\u3059&#39;);\n    }\n}\n\nsampleFunction(5, 10)\nsampleFunction(&#39;Hello&#39;, 10);<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>15\n\u6570\u5024\u4ee5\u5916\u306e\u5024\u304c\u6e21\u3055\u308c\u3066\u3044\u307e\u3059<\/code><\/pre><\/div>\n\n\n\n<h3 id=\"outline__5_3\" class=\"wp-block-heading\">\u5f15\u6570\u306b\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3092\u8a2d\u5b9a\u3059\u308b<\/h3>\n\n\n\n<p>\u95a2\u6570\u306e\u5f15\u6570\u306b\u306f\u3001\u5225\u306e\u95a2\u6570\u3092\u6e21\u3059\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<br>\u4ee5\u4e0b\u306e\u4f8b\u306e\u3088\u3046\u306b\u3001\u5f15\u6570\u3068\u3057\u3066\u89aa\u95a2\u6570\u306b\u6e21\u3057\u3001\u7279\u5b9a\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u5b9f\u884c\u3055\u308c\u308b\u95a2\u6570\u306e\u3053\u3068\u3092\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3068\u547c\u3073\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sampleFunction(callback) {\n    console.log(&#39;\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3092\u5b9f\u884c\u3057\u307e\u3059&#39;);\n    callback();\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u5f15\u6570\u306b\u6e21\u3059\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306f\u3001\u65e2\u306b\u5b9a\u7fa9\u6e08\u307f\u306e\u95a2\u6570\u3092\u6e21\u3059\u65b9\u6cd5\u3068\u3001\u305d\u306e\u5834\u3067\u95a2\u6570\u3092\u5b9a\u7fa9\u3057\u3066\u6e21\u3059\u65b9\u6cd5\u306e2\u901a\u308a\u3067\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u65e2\u306b\u5b9a\u7fa9\u6e08\u307f\u306e\u95a2\u6570\u3092\u6e21\u3059\u5834\u5408\u306f\u3001\u95a2\u6570\u306e\u547c\u3073\u51fa\u3057\u6642\u306b\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3068\u3057\u3066\u6e21\u3059\u95a2\u6570\u306e\u540d\u524d\u3092 () \u5185\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>sampleFunction(callFunc)<\/code><\/pre><\/div>\n\n\n\n<p>\u6ce8\u610f\u70b9\u3068\u3057\u3066\u3001\u5f15\u6570\u306b\u6e21\u3059\u306e\u306f\u95a2\u6570\u306e\u5b9f\u884c\u7d50\u679c\u3067\u306f\u306a\u304f\u95a2\u6570\u305d\u306e\u3082\u306e (Function\u30aa\u30d6\u30b8\u30a7\u30af\u30c8) \u3067\u3042\u308b\u305f\u3081\u3001\u95a2\u6570\u540d\u306e\u5f8c\u308d\u306b () \u306f\u4ed8\u3051\u305a\u306b\u8a18\u8ff0\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<p>\u95a2\u6570\u3092\u305d\u306e\u5834\u3067\u76f4\u63a5\u5b9a\u7fa9\u3057\u3066\u6e21\u3059\u5834\u5408\u306f\u3001\u95a2\u6570\u540d\u306e\u4ee3\u308f\u308a\u306b\u95a2\u6570\u5f0f\u3092 () \u306e\u4e2d\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>sampleFunction(function() {\n    console.log(&#39;\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u3092\u5b9f\u884c\u3057\u307e\u3057\u305f&#39;);\n});<\/code><\/pre><\/div>\n\n\n\n<p>\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306f\u3001\u4e3b\u306bAPI\u306a\u3069\u306e\u975e\u540c\u671f\u51e6\u7406\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u4f7f\u7528\u3055\u308c\u308b\u3053\u3068\u304c\u591a\u3044\u95a2\u6570\u3067\u3059\u3002<br>\u975e\u540c\u671f\u51e6\u7406\u3082\u307e\u305f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3059\u308b\u4e0a\u3067\u6d3b\u7528\u3059\u308b\u6a5f\u4f1a\u306f\u591a\u3005\u3042\u308b\u305f\u3081\u3001\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3068\u5408\u308f\u305b\u3066\u899a\u3048\u3066\u304a\u304f\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 id=\"outline__6\" class=\"wp-block-heading\">\u95a2\u6570\u3067\u5024\u3092\u8fd4\u3059\uff08\u623b\u308a\u5024\u3092\u8a2d\u5b9a\u3059\u308b\uff09<\/h2>\n\n\n\n<p>\u95a2\u6570\u306f\u3001\u5f15\u6570\u3092\u4f7f\u3063\u3066\u5916\u304b\u3089\u5024\u3092\u53d7\u3051\u53d6\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u623b\u308a\u5024\u3092\u8a2d\u5b9a\u3057\u3066\u30d6\u30ed\u30c3\u30af\u5185\u3067\u306e\u51e6\u7406\u7d50\u679c\u3092\u95a2\u6570\u5916\u306b\u5f15\u304d\u6e21\u3059\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u7d9a\u3044\u3066\u306f\u3001\u95a2\u6570\u3067\u623b\u308a\u5024\u3092\u8a2d\u5b9a\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 id=\"outline__6_1\" class=\"wp-block-heading\">return\u6587\u306e\u66f8\u304d\u65b9<\/h3>\n\n\n\n<p>\u95a2\u6570\u3067\u623b\u308a\u5024\u3092\u8a2d\u5b9a\u3059\u308b\u969b\u306f\u3001return\u6587\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<br>\u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9\u306f\u3001\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sampleFunction(numX, numY) {\n    \/\/ \u623b\u308a\u5024\u3092 return\u6587\u3067\u6307\u5b9a\n    return numX + numY;\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8a18\u306e\u5834\u5408\u306f\u3001\u5f15\u6570\u306b\u6e21\u3055\u308c\u305f2\u3064\u306e\u5024\u3092\u8db3\u3057\u305f\u7d50\u679c\u3092\u3001\u95a2\u6570\u306e\u623b\u308a\u5024\u3068\u3057\u3066\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<br>\u3053\u306e\u95a2\u6570\u3092\u5b9f\u884c\u3057\u3066\u307f\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7d50\u679c\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const result = sampleFunction(10, 20);\nconsole.log(result);<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>30<\/code><\/pre><\/div>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u95a2\u6570\u306b\u623b\u308a\u5024\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u95a2\u6570\u5185\u3067\u51e6\u7406\u3057\u305f\u7d50\u679c\u3092\u30d6\u30ed\u30c3\u30af\u306e\u5916\u3078\u3068\u6e21\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__6_2\" class=\"wp-block-heading\">\u623b\u308a\u5024\u3067\u6761\u4ef6\u5206\u5c90\u3092\u884c\u3046<\/h3>\n\n\n\n<p>return\u6587\u306f\u3001\u95a2\u6570\u306e\u4e2d\u3067\u8907\u6570\u8a18\u8ff0\u3055\u308c\u3066\u3044\u3066\u3082\u3001\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002<br>\u305f\u3060\u3057\u3001\u3044\u305a\u308c\u304b1\u3064\u306e return\u6587\u304c\u521d\u3081\u306b\u5b9f\u884c\u3055\u308c\u305f\u6bb5\u968e\u3067\u3001\u95a2\u6570\u306e\u51e6\u7406\u306f\u7d42\u4e86\u3057\u30d6\u30ed\u30c3\u30af\u306e\u5916\u3078\u3068\u51e6\u7406\u304c\u79fb\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sampleFunction() {\n    return console.log(&#39;1\u756a\u76ee&#39;);\n    return console.log(&#39;2\u756a\u76ee&#39;);\n    return console.log(&#39;3\u756a\u76ee&#39;);\n}\n\nsampleFunction();\nconsole.log(&#39;\u5b9f\u884c\u5b8c\u4e86&#39;);<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>1\u756a\u76ee\n\u5b9f\u884c\u5b8c\u4e86<\/code><\/pre><\/div>\n\n\n\n<p>\u3053\u306e\u6027\u8cea\u3092\u5229\u7528\u3057\u3066\u3001\u95a2\u6570\u306e\u623b\u308a\u5024\u3092 if\u6587\u3067\u6761\u4ef6\u5206\u3051\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function sampleFunction(numX, numY) {\n    const result = numX + numY;\n\n    if (result &gt; 10){\n        return true;\n    } else {\n        return false;\n    }\n}\n\nconst result1 = sampleFunction(10, 20);\nconst result2 = sampleFunction(2, 3);\n\nconsole.log(result1);\nconsole.log(result2);<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>true\nfalse<\/code><\/pre><\/div>\n\n\n\n<h2 id=\"outline__7\" class=\"wp-block-heading\">\u95a2\u6570\u306e this \u30ad\u30fc\u30ef\u30fc\u30c9<\/h2>\n\n\n\n<p>JavaScript\u306b\u306f\u3001\u30b3\u30fc\u30c9\u306e\u5b9f\u884c\u74b0\u5883 (\u5b9f\u884c\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8) \u306b\u5fdc\u3058\u305f\u7279\u5b9a\u306e\u5024\u3092\u53c2\u7167\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3001\u300cthis\u300d \u3068\u3044\u3046\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u5b58\u5728\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>this\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u95a2\u6570\u5185\u3067\u3082\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001\u305d\u306e\u95a2\u6570\u304c\u3069\u306e\u3088\u3046\u306b\u547c\u3073\u51fa\u3055\u308c\u305f\u304b\u306b\u3088\u3063\u3066\u53c2\u7167\u3067\u304d\u308b\u5024\u304c\u7570\u306a\u308a\u307e\u3059\u3002<br>\u5b9f\u969b\u306b this\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u3069\u306e\u5024\u3092\u53c2\u7167\u3059\u308b\u304b\u306b\u3064\u3044\u3066\u3001\u547c\u3073\u51fa\u3057\u65b9\u6cd5\u3054\u3068\u306b\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 id=\"outline__7_1\" class=\"wp-block-heading\">\u901a\u5e38\u306e\u95a2\u6570\u306b\u304a\u3051\u308b this<\/h3>\n\n\n\n<p>\u5358\u72ec\u306e\u95a2\u6570\u3068\u3057\u3066\u547c\u3073\u51fa\u3055\u308c\u305f\u5834\u5408\u3001\u305d\u306e\u95a2\u6570\u5185\u3067\u4f7f\u7528\u3055\u308c\u308b this\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53c2\u7167\u3057\u307e\u3059\u3002<br>\u30b0\u30ed\u30fc\u30d0\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f JavaScript\u3092\u5b9f\u884c\u3057\u3066\u3044\u308b\u74b0\u5883\u306b\u3088\u3063\u3066\u7570\u306a\u308a\u3001\u30d6\u30e9\u30a6\u30b6\u306e\u5834\u5408\u306f Window\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5bfe\u8c61\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>\/\/ \u5358\u72ec\u306e\u95a2\u6570\u3068\u3057\u3066\u547c\u3073\u51fa\u3059\nsampleFunc();\n\nfunction sampleFunc() {\n    console.log(this); \/\/ \u30b0\u30ed\u30fc\u30d0\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53c2\u7167\n}<\/code><\/pre><\/div>\n\n\n\n<p>\u95a2\u6570\u5b9a\u7fa9\u3001\u3082\u3057\u304f\u306f\u95a2\u6570\u5f0f\u3067\u5b9a\u7fa9\u3057\u305f\u95a2\u6570\u306b\u3064\u3044\u3066\u306f\u540c\u69d8\u306e\u632f\u308b\u821e\u3044\u3092\u3057\u307e\u3059\u304c\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u3067\u5b9a\u7fa9\u3057\u305f\u5834\u5408\u306f this\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u53c2\u7167\u3059\u308b\u5024\u304c\u7570\u306a\u308b\u305f\u3081\u3001\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<br>\uff08\u8a73\u3057\u3044\u4ed5\u69d8\u306b\u3064\u3044\u3066\u306f\u3001\u5f8c\u307b\u3069\u89e3\u8aac\u3057\u307e\u3059\uff09<\/p>\n\n\n\n<h3 id=\"outline__7_2\" class=\"wp-block-heading\">\u30e1\u30bd\u30c3\u30c9\u306b\u304a\u3051\u308b this<\/h3>\n\n\n\n<p>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u95a2\u6570\u304c\u547c\u3073\u51fa\u3055\u308c\u305f\u5834\u5408\u3001this\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u81ea\u8eab\u3092\u53c2\u7167\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>class sampleClass {\n\n    constructor(name) {\n        this.name = name;\n    }\n\n    sampleFunc(){\n        console.log(this);\n    }\n}\n\nconst myClass = new sampleClass(&#39;Taro Yamada&#39;);\nmyClass.sampleFunc();<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>Object { name: &#39;Taro Yamada&#39; }<\/code><\/pre><\/div>\n\n\n\n<p>\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u5185\u3067\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u3092\u8a2d\u5b9a\u3059\u308b\u969b\u306a\u3069\u3001this\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u30b1\u30fc\u30b9\u306e\uff11\u3064\u3067\u3059\u3002<\/p>\n\n\n\n<h3 id=\"outline__7_3\" class=\"wp-block-heading\">\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u306b\u304a\u3051\u308b this<\/h3>\n\n\n\n<p>\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u3067\u5b9a\u7fa9\u3057\u305f\u95a2\u6570\u306e\u4e2d\u3067 this\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u305f\u5834\u5408\u306f\u3001\u95a2\u6570\u5ba3\u8a00\u3084\u95a2\u6570\u5f0f\u3067\u5b9a\u7fa9\u3057\u305f\u5834\u5408\u3068\u6319\u52d5\u304c\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u306f\u3001\u305d\u306e\u4ed6\u306e\u65b9\u6cd5\u3067\u5b9a\u7fa9\u3057\u305f\u95a2\u6570\u3068\u306f\u9055\u3044\u3001\u81ea\u5206\u81ea\u8eab\u3067\u306f this\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u6301\u3061\u307e\u305b\u3093\u3002\uff08this\u3078\u306e\u30d0\u30a4\u30f3\u30c9\u304c\u3042\u308a\u307e\u305b\u3093\uff09<br>\u305d\u306e\u305f\u3081\u3001\u95a2\u6570\u304c\u3069\u3046\u547c\u3073\u51fa\u3055\u308c\u305f\u304b\u306b\u95a2\u4fc2\u306a\u304f\u3001\u5b9a\u7fa9\u3055\u308c\u305f\u6642\u70b9\u3067\u306e\u89aa\u30b9\u30b3\u30fc\u30d7\uff08\u95a2\u6570\u304c\u5b9a\u7fa9\u3055\u308c\u305f\u5834\u6240\uff09\u306e\u53c2\u7167\u5148\u3092\u7d99\u627f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305a\u306f\u3001\u4ee5\u4e0b\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>function printName() {\n  console.log(this.name);\n}\n\nconst sampleObj = {\n    name: &#39;Taro Yamada&#39;,\n    func: printName\n}\n\nprintName();\nsampleObj.func();<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>undefined\nTaro Yamada<\/code><\/pre><\/div>\n\n\n\n<p>\u95a2\u6570\u5ba3\u8a00\u306b\u3088\u3063\u3066\u5b9a\u7fa9\u3055\u308c\u305f\u95a2\u6570\u306e\u5834\u5408\u3001\u5358\u72ec\u3067\u547c\u3073\u51fa\u3055\u308c\u305f\u6642\u306f\u30b0\u30ed\u30fc\u30d0\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u547c\u3073\u51fa\u3055\u308c\u305f\u6642\u306f\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u3001this\u30ad\u30fc\u30ef\u30fc\u30c9\u3067\u53c2\u7167\u3055\u308c\u308b\u5148\u304c\u5909\u5316\u3057\u3066\u3044\u307e\u3059\u3002<br>\u305d\u306e\u305f\u3081\u3001name\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5024\u304c\u305d\u308c\u305e\u308c\u7570\u306a\u3063\u3066\u3044\u308b\u306e\u304c\u3001\u5b9f\u884c\u7d50\u679c\u304b\u3089\u3082\u5206\u304b\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4e00\u65b9\u3067\u3001printName\u95a2\u6570\u306e\u5b9a\u7fa9\u65b9\u6cd5\u3092\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u306b\u5909\u66f4\u3057\u305f\u5834\u5408\u306e\u6319\u52d5\u306f\u3069\u3046\u306a\u308b\u3067\u3057\u3087\u3046\u304b\u3002<br>\u5b9f\u969b\u306e\u4f8b\u3067\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>const printName = () =&gt; {\n  console.log(this.name);\n}\n\nconst sampleObj = {\n    name: &#39;Taro Yamada&#39;,\n    func: printName\n}\n\nprintName();\nsampleObj.func();<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>undefined\nundefined<\/code><\/pre><\/div>\n\n\n\n<p>\u95a2\u6570\u5ba3\u8a00\u3067\u5b9a\u7fa9\u3057\u305f\u6642\u3068\u306f\u7570\u306a\u308b\u7d50\u679c\u304c\u8868\u793a\u3055\u308c\u307e\u3057\u305f\u306d\u3002<\/p>\n\n\n\n<p>\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u306e\u5834\u5408\u306f\u3001\u4e0a\u8ff0\u3057\u305f\u3088\u3046\u306b\u3001\u95a2\u6570\u3092\u5b9a\u7fa9\u3057\u305f\u6642\u70b9\u3067\u306e\u89aa\u30b9\u30b3\u30fc\u30d7\u306e\u53c2\u7167\u5148\u3092\u7d99\u627f\u3057\u307e\u3059\u3002<br>\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001\u5b9a\u7fa9\u6642\u306e\u89aa\u30b9\u30b3\u30fc\u30d7\u306e\u53c2\u7167\u5148\u304c\u30b0\u30ed\u30fc\u30d0\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u306a\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u547c\u3073\u51fa\u3057\u305f\u969b\u3082\u3001\u5bfe\u8c61\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u306f\u306a\u304f\u30b0\u30ed\u30fc\u30d0\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53c2\u7167\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u6027\u8cea\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u901a\u5e38\u306e\u95a2\u6570\u3067\u306f\u30a8\u30e9\u30fc\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u3088\u3046\u306a\u30b3\u30fc\u30c9\u5185\u5bb9\u3092\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u3092\u4f7f\u3063\u3066\u89e3\u6c7a\u3067\u304d\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305a\u306f\u3001\u4ee5\u4e0b\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>class sampleClass {\n\n    constructor(name) {\n        this.name = name;\n    }\n\n    showName() {\n        const func = function(){\n            console.log(this.name);\n        }\n        func();\n    }\n}\n\nconst myClass = new sampleClass(&#39;Taro Yamada&#39;);\nmyClass.showName();<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>TypeError: Cannot read properties of undefined<\/code><\/pre><\/div>\n\n\n\n<p>\u4e0a\u8a18\u306e\u7d50\u679c\u306e\u901a\u308a\u3001\u3053\u306e\u30b3\u30fc\u30c9\u3092\u305d\u306e\u307e\u307e\u5b9f\u884c\u3059\u308b\u3068\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002<br>\u539f\u56e0\u306f\u3001showName\u95a2\u6570\u5185\u3067\u5b9a\u7fa9\u3057\u305f\u95a2\u6570\u3092\u305d\u306e\u307e\u307e\u5b9f\u884c\u3057\u3088\u3046\u3068\u3057\u305f\u3053\u3068\u306b\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>JavaScript\u306b\u306f\u3001strict mode\u3068\u3044\u3046\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53c2\u7167\u5148\u3068\u3059\u308b this\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u610f\u56f3\u7684\u306b\u5236\u9650\u3067\u304d\u308b\u6a5f\u80fd\u304c\u3042\u308a\u3001\u30af\u30e9\u30b9\u5185\u3067\u306f\u3053\u308c\u304c\u81ea\u52d5\u7684\u306b\u9069\u7528\u3055\u308c\u308b\u4ed5\u7d44\u307f\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<br>\u30e1\u30bd\u30c3\u30c9\u3067\u306a\u3044\u95a2\u6570\u306e this\u306e\u53c2\u7167\u5148\u306f\u30b0\u30ed\u30fc\u30d0\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3068\u306a\u308b\u305f\u3081\u3001func\u95a2\u6570\u5185\u306e this\u306e\u30a2\u30af\u30bb\u30b9\u304c\u5236\u9650\u3055\u308c\u3001\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u3066\u3044\u308b\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<p>func\u95a2\u6570\u3092\u30a2\u30ed\u30fc\u95a2\u6570\u5f0f\u3092\u4f7f\u7528\u3057\u3066\u5b9a\u7fa9\u3059\u308b\u3068\u3001\u89aa\u30b9\u30b3\u30fc\u30d7\u3067\u3042\u308bshowName\u95a2\u6570\u306e\u53c2\u7167\u5148\u3092\u7d99\u627f\u3059\u308b\u305f\u3081\u3001sampleClass\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c this\u306e\u53c2\u7167\u5148\u3068\u306a\u3063\u3066\u3053\u306e\u30a8\u30e9\u30fc\u3092\u89e3\u6c7a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u3010\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>showName(){\n    const func = () =&gt; {\n        console.log(this.name);\n    } \n    func();\n}<\/code><\/pre><\/div>\n\n\n\n<p><strong>\u3010\u5b9f\u884c\u7d50\u679c\u3011<\/strong><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>Taro Yamada<\/code><\/pre><\/div>\n\n\n\n<h2 id=\"outline__8\" class=\"wp-block-heading\">\u95a2\u6570\u306e\u300c\u30b9\u30b3\u30fc\u30d7\u300d\u3068\u306f\uff1f<\/h2>\n\n\n\n<p>\u5148\u307b\u3069\u3001this\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u89e3\u8aac\u306b\u4f34\u3063\u3066\u30b9\u30b3\u30fc\u30d7\u306b\u3064\u3044\u3066\u3082\u8efd\u304f\u89e6\u308c\u307e\u3057\u305f\u304c\u3001\u305d\u3082\u305d\u3082\u30b9\u30b3\u30fc\u30d7\u3068\u306f\u4f55\u304b\uff1f\u3068\u7591\u554f\u306b\u611f\u3058\u305f\u65b9\u3082\u3044\u305f\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<br>\u30b9\u30b3\u30fc\u30d7\u3068\u306f\u3001\u30b3\u30fc\u30c9\u4e0a\u3067\u5ba3\u8a00\u3057\u305f\u5909\u6570\u3084\u95a2\u6570\u306a\u3069\u3092\u53c2\u7167\u3067\u304d\u308b\u7bc4\u56f2\u306e\u3053\u3068\u3092\u6307\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u3001\u95a2\u6570\u5185\u3067\u5ba3\u8a00\u3057\u305f\u5909\u6570\u306f\u57fa\u672c\u7684\u306b\u3001\u95a2\u6570\u306e\u5916\u3067\u547c\u3073\u51fa\u3059\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<br>\u3053\u308c\u306f\u3001\u5909\u6570\u306e\u53c2\u7167\u3067\u304d\u308b\u7bc4\u56f2\u304c\u30d6\u30ed\u30c3\u30af\u5185\u306e\u307f\u306b\u9650\u5b9a\u3055\u308c\u3066\u3044\u308b\u304b\u3089\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u5909\u6570\u306a\u3069\u304c\u3069\u306e\u5834\u6240\u304b\u3089\u53c2\u7167\u3067\u304d\u308b\u304b\u3092\u5b9a\u7fa9\u3057\u305f\u3082\u306e\u3092\u3001\u30b9\u30b3\u30fc\u30d7\u3068\u547c\u3073\u307e\u3059\u3002<\/p>\n\n\n\n<p>JavaScript\u306b\u304a\u3051\u308b\u30b9\u30b3\u30fc\u30d7\u306f\u3001\u5927\u307e\u304b\u306b\u5206\u3051\u3066\u4ee5\u4e0b\u306e\uff12\u3064\u306b\u5206\u985e\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b0\u30ed\u30fc\u30d0\u30eb\u30b9\u30b3\u30fc\u30d7<\/li>\n\n\n\n<li>\u30ed\u30fc\u30ab\u30eb\u30b9\u30b3\u30fc\u30d7<\/li>\n<\/ul>\n\n\n\n<p>\u30b0\u30ed\u30fc\u30d0\u30eb\u30b9\u30b3\u30fc\u30d7\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u5168\u4f53\u3092\u53c2\u7167\u7bc4\u56f2\u3068\u3059\u308b\u30b9\u30b3\u30fc\u30d7\u3067\u3059\u3002<br>\u30b0\u30ed\u30fc\u30d0\u30eb\u30b9\u30b3\u30fc\u30d7\u5185\u3067\u5b9a\u7fa9\u3057\u305f\u5909\u6570\u306f\u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\u3068\u547c\u3070\u308c\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u3069\u3053\u304b\u3089\u3067\u3082\u53c2\u7167\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4e00\u65b9\u3001\u305d\u308c\u4ee5\u5916\u306e\u30b9\u30b3\u30fc\u30d7\u306f\u30ed\u30fc\u30ab\u30eb\u30b9\u30b3\u30fc\u30d7\u306b\u5206\u985e\u3055\u308c\u307e\u3059\u3002<br>\u30b0\u30ed\u30fc\u30d0\u30eb\u30b9\u30b3\u30fc\u30d7\u3068\u6bd4\u3079\u3001\u53c2\u7167\u7bc4\u56f2\u304c\u3042\u308b\u7a0b\u5ea6\u9650\u5b9a\u3055\u308c\u308b\u306e\u304c\u7279\u5fb4\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u30ed\u30fc\u30ab\u30eb\u30b9\u30b3\u30fc\u30d7\u306f\u3001\u3055\u3089\u306b\u4ee5\u4e0b\u306e\uff12\u7a2e\u985e\u306b\u5206\u985e\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u95a2\u6570\u30b9\u30b3\u30fc\u30d7<\/li>\n\n\n\n<li>\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7<\/li>\n<\/ul>\n\n\n\n<p>\u95a2\u6570\u30b9\u30b3\u30fc\u30d7\u306f\u3001\u305d\u306e\u540d\u306e\u901a\u308a\u306b\u95a2\u6570\u5185\u3092\u53c2\u7167\u7bc4\u56f2\u3068\u3059\u308b\u30b9\u30b3\u30fc\u30d7\u3067\u3059\u3002<br>\u5148\u307b\u3069\u4f8b\u306b\u6319\u3052\u305f\u3001\u95a2\u6570\u5185\u3067\u5ba3\u8a00\u3057\u305f\u5909\u6570\u306e\u30b9\u30b3\u30fc\u30d7\u3082\u3001\u3053\u306e\u95a2\u6570\u30b9\u30b3\u30fc\u30d7\u304c\u9069\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<br>\u53c2\u7167\u7bc4\u56f2\u304c\u95a2\u6570\u5185\u306e\u307f\u3068\u306a\u308b\u305f\u3081\u3001\u95a2\u6570\u5185\u3067\u547c\u3073\u51fa\u3057\u305f\u308a\u3001\u5f15\u6570\u306b\u6e21\u3059\u5024\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u3053\u3068\u306f\u53ef\u80fd\u3067\u3059\u304c\u3001\u5ba3\u8a00\u3057\u305f\u95a2\u6570\u306e\u5916\u3067\u5909\u6570\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306f\u4e0d\u53ef\u80fd\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4e00\u65b9\u3001\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7\u306f\u3001{} \u3067\u56f2\u308f\u308c\u305f\u30d6\u30ed\u30c3\u30af\u3092\u53c2\u7167\u7bc4\u56f2\u3068\u3059\u308b\u30b9\u30b3\u30fc\u30d7\u3068\u306a\u308a\u307e\u3059\u3002<br>\u4f8b\u3048\u3070\u3001if\u6587\u3084 for\u6587\u306a\u3069\u306e {} \u5185\u3067\u5ba3\u8a00\u3057\u305f\u5909\u6570\u306e\u30b9\u30b3\u30fc\u30d7\u304c\u3053\u308c\u306b\u5f53\u305f\u308a\u307e\u3059\u3002<br>\u3053\u3061\u3089\u3082\u95a2\u6570\u30b9\u30b3\u30fc\u30d7\u3068\u540c\u69d8\u306b\u3001\u30d6\u30ed\u30c3\u30af\u5185\u3067\u5ba3\u8a00\u3057\u305f\u5909\u6570\u3092\u5916\u304b\u3089\u547c\u3073\u51fa\u3059\u3053\u3068\u306f\u4e0d\u53ef\u80fd\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5404\u30b9\u30b3\u30fc\u30d7\u306e\u53c2\u7167\u7bc4\u56f2\u306e\u5927\u304d\u3055\u306e\u9806\u756a\u306f\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u30b9\u30b3\u30fc\u30d7 \uff1e \u95a2\u6570\u30b9\u30b3\u30fc\u30d7 &gt; \u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7 \u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<br>\u3053\u308c\u3089\u306e\u53c2\u7167\u7bc4\u56f2\u3092\u610f\u56f3\u7684\u306b\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u3067\u3001\u5909\u6570\u306e\u5024\u3092\u5916\u304b\u3089\u5bb9\u6613\u306b\u5909\u66f4\u3067\u304d\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u306a\u3069\u3001\u30b3\u30fc\u30c9\u306e\u4fdd\u5b88\u6027\u3092\u9ad8\u3081\u308b\u305f\u3081\u306b\u5f79\u7acb\u3066\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 id=\"outline__9\" class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u3044\u304b\u304c\u3067\u3057\u305f\u304b\uff1f\u4eca\u56de\u306f\u3001JavaScript\u306b\u304a\u3051\u308b\u95a2\u6570\u306e\u4ed5\u69d8\u3084\u4f7f\u7528\u65b9\u6cd5\u306a\u3069\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u66f8\u304d\u65b9\uff11\u3064\u3092\u3068\u3063\u3066\u3082\u3001\u69d8\u3005\u306a\u65b9\u6cd5\u3067\u5b9a\u7fa9\u3067\u304d\u308b\u306e\u304c\u3001JavaScript\u306e\u95a2\u6570\u306e\u5927\u304d\u306a\u7279\u5fb4\u3067\u3059\u3002<br>\u95a2\u6570\u3092\u6d3b\u7528\u3067\u304d\u308b\u5834\u9762\u306b\u3064\u3044\u3066\u3082\u540c\u69d8\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u6163\u308c\u306a\u3044\u5185\u306f\u3001\u66f8\u304d\u65b9\u3084\u4f7f\u3044\u65b9\u306e\u9055\u3044\u3092\u7406\u89e3\u3059\u308b\u306e\u304c\u5927\u5909\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3092\u3059\u308b\u4e0a\u3067\u6b20\u304b\u305b\u306a\u3044\u91cd\u8981\u306a\u6a5f\u80fd\u3068\u306a\u308a\u307e\u3059\u306e\u3067\u3001\u3057\u3063\u304b\u308a\u3068\u899a\u3048\u3066\u4f7f\u3044\u3053\u306a\u305b\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n\n\n\n<h2 id=\"outline__10\" class=\"wp-block-heading\">JavaScript\u306e\u52c9\u5f37\u65b9\u6cd5\u306f\uff1f<\/h2>\n\n\n<p>\u66f8\u7c4d\u3084\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3067\u5b66\u7fd2\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002\u6628\u4eca\u3067\u306f\u3001YouTube\u306a\u3069\u306e\u52d5\u753b\u30b5\u30a4\u30c8\u3084\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u30b5\u30a4\u30c8\u306a\u3069\u3082\u5145\u5b9f\u3057\u3066\u3044\u3066\u591a\u304f\u306e\u60c5\u5831\u304c\u624b\u306b\u5165\u308a\u307e\u3059\u3002<br \/>\u305d\u3057\u3066\u3001\u3088\u308a\u52b9\u7387\u7684\u306b\u77e5\u8b58\u30fb\u30b9\u30ad\u30eb\u3092\u7fd2\u5f97\u3059\u308b\u306b\u306f\u3001\u77e5\u8b58\u3092\u3064\u3051\u306a\u304c\u3089\u5b9f\u969b\u306b\u624b\u3092\u52d5\u304b\u3057\u3066\u307f\u308b\u306a\u3069\u3001\u30a4\u30f3\u30d7\u30c3\u30c8\u3068\u30a2\u30a6\u30c8\u30d7\u30c3\u30c8\u3092\u7e70\u308a\u8fd4\u3057\u3066\u3044\u304f\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u7279\u306b\u72ec\u5b66\u306e\u5834\u5408\u306f\u3001\u6709\u8b58\u8005\u306b\u8cea\u554f\u304c\u3067\u304d\u305f\u308a\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u3092\u3082\u3089\u3048\u308b\u3088\u3046\u306a\u74b0\u5883\u304c\u3042\u308b\u3068\u3001\u7406\u89e3\u5ea6\u304c\u6df1\u307e\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u305f\u3060\u3001JavaScript\u306b\u9650\u3089\u305a\u3001IT\u30b9\u30ad\u30eb\u3092\u8eab\u306b\u3064\u3051\u308b\u969b\u3001\u3069\u3046\u3057\u3066\u3082\u8ab2\u984c\u306b\u3076\u3064\u304b\u3063\u3066\u3057\u307e\u3046\u3053\u3068\u306f\u3042\u308a\u307e\u3059\u3088\u306d\u3002\u7279\u306b\u72ec\u5b66\u3060\u3068\u3001\u308f\u304b\u3089\u306a\u3044\u90e8\u5206\u3092\u30d7\u30ed\u306b\u8cea\u554f\u3067\u304d\u308b\u6a5f\u4f1a\u3092\u78ba\u4fdd\u3057\u306b\u304f\u304f\u3001\u30e2\u30c1\u30d9\u30fc\u30b7\u30e7\u30f3\u304c\u7d9a\u304d\u306b\u304f\u3044\u3068\u3044\u3046\u5074\u9762\u304c\u3042\u308a\u307e\u3059\u3002\u72ec\u5b66\u3067\u30e2\u30c1\u30d9\u30fc\u30b7\u30e7\u30f3\u3092\u7dad\u6301\u3059\u308b\u81ea\u4fe1\u304c\u306a\u3044\u4eba\u306b\u306f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u3068\u3044\u3046\u624b\u3082\u3042\u308a\u307e\u3059\u3002\u8cbb\u7528\u306f\u639b\u304b\u308a\u307e\u3059\u304c\u3001\u305d\u306e\u5206\u30b9\u30ad\u30eb\u3092\u8eab\u306b\u3064\u3051\u3084\u3059\u3044\u3067\u3059\u3002\u3057\u3063\u304b\u308a\u3068\u77e5\u8b58\u30fb\u30b9\u30ad\u30eb\u3092\u7fd2\u5f97\u3057\u3066\u5b9f\u8df5\u306b\u6d3b\u304b\u3057\u305f\u3044\u3068\u3044\u3046\u4eba\u306f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002<\/p>\n<p><span class=\"markerYellow\"><strong>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u30b9\u30af\u30fc\u30eb\u306a\u3089\u30c6\u30c3\u30af\u30de\u30cb\u30a2\u304c\u304a\u3059\u3059\u3081\uff01<\/strong><\/span><\/p>\n\n\n<img decoding=\"async\" src=\"https:\/\/web-img.rensa.jp.net\/rensa\/images\/techmania\/thumbnail\/images\/yuudou.png\" alt=\"\" class=\"post-img\" 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