{"id":105363,"date":"2019-08-06T09:41:35","date_gmt":"2019-08-06T00:41:35","guid":{"rendered":"https:\/\/www.sejuku.net\/blog\/?p=105363"},"modified":"2025-12-26T14:55:29","modified_gmt":"2025-12-26T05:55:29","slug":"%e3%82%82%e3%81%86%e6%82%a9%e3%81%be%e3%81%aa%e3%81%84%ef%bc%81javascript%e5%88%9d%e5%bf%83%e8%80%85%e3%81%ae%e8%aa%b2%e9%a1%8c%e3%81%a8%e3%83%9d%e3%82%a4%e3%83%b3%e3%83%88%e3%82%92%e5%88%86%e3%81%8b","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/105363","title":{"rendered":"\u3082\u3046\u60a9\u307e\u306a\u3044\uff01JavaScript\u521d\u5fc3\u8005\u306e\u8ab2\u984c\u3068\u30dd\u30a4\u30f3\u30c8\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac"},"content":{"rendered":"<p><div class=\"box_voice\"><b><br \/>\nJavaScript\u521d\u5fc3\u8005\u304c\u8ab2\u984c\u306b\u611f\u3058\u308b\u306e\u306f\u3069\u3093\u306a\u3053\u3068\uff1f<br \/>\n\u697d\u3057\u304fJavaScript\u3092\u5b66\u7fd2\u3067\u304d\u308bWeb\u30b5\u30fc\u30d3\u30b9\u3063\u3066\u306a\u3044\u306e\u304b\u306a<br \/>\n\u521d\u5fc3\u8005\u304c\u307e\u305a\u899a\u3048\u3066\u304a\u304f\u3079\u304d\u30dd\u30a4\u30f3\u30c8\u3092\u77e5\u308a\u305f\u3044<br \/>\n<\/b><\/div><\/p>\n<p>\u307f\u306a\u3055\u3093\u306fJavaScript\u306e\u5b66\u7fd2\u306b\u304a\u3044\u3066\u3001\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\u3084\u30b3\u30c4\u304c\u3042\u308b\u306e\u3092\u3054\u5b58\u77e5\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>JavaScript\u306f\u3055\u307e\u3056\u307e\u306a\u7528\u9014\u306b\u4f7f\u3048\u308b\u975e\u5e38\u306b\u67d4\u8edf\u306a\u8a00\u8a9e\u3067\u3059\u304c\u3001\u57fa\u672c\u3068\u306a\u308b\u90e8\u5206\u3092\u3057\u3063\u304b\u308a\u3068\u5b66\u7fd2\u3057\u3066\u304a\u304f\u3053\u3068\u306f\u3068\u3066\u3082\u91cd\u8981\u3067\u3059\u3002\u57fa\u672c\u304c\u51fa\u6765\u3066\u3044\u308c\u3070\u3055\u307e\u3056\u307e\u306a\u5fdc\u7528\u529b\u3082\u81ea\u7136\u3068\u898b\u306b\u3064\u3044\u3066\u304d\u307e\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u3044\u3056\u5b66\u7fd2\u3092\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3069\u3053\u304b\u3089\u52c9\u5f37\u3092\u59cb\u3081\u305f\u3089\u826f\u3044\u306e\u304b\u60a9\u3080\u4eba\u3082\u5c11\u306a\u304f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u3053\u306e\u8a18\u4e8b\u3067\u306fJavaScript\u521d\u5fc3\u8005\u304c\u8ab2\u984c\u306b\u611f\u3058\u308b\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306e\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u306e\u3067\u3001\u305c\u3072\u6700\u5f8c\u307e\u3067\u8aad\u3093\u3067\u7406\u89e3\u3092\u6df1\u3081\u3066\u9802\u3051\u308c\u3070\u5e78\u3044\u3067\u3059\u3002<\/p>\n<p>\u4e00\u4eba\u3067\u3082\u591a\u304f\u306e\u65b9\u304cJavaScript\u306e\u4e0d\u5b89\u3092\u89e3\u6d88\u3067\u304d\u308c\u3070\u5e78\u3044\u3067\u3059\u3002<\/p>\n<h2>\u57fa\u672c\u69cb\u6587<\/h2>\n<p>\u3053\u306e\u7ae0\u3067\u306f\u3001JavaScript\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u306b\u304a\u3044\u3066\u30dd\u30a4\u30f3\u30c8\u3092\u7d5e\u3063\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u4e3b\u306b\u3001\u5909\u6570\u3084\u914d\u5217\u3001\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3001\u6761\u4ef6\u5206\u5c90\u306b\u3064\u3044\u3066\u5b66\u3093\u3067\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3>let\/const\u306e\u4f7f\u3044\u65b9<\/h3>\n<p>\u307e\u305a\u306f\u3082\u3063\u3068\u3082\u57fa\u672c\u3068\u306a\u308b\u5909\u6570\u5b9a\u7fa9\u304b\u3089\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>JavaScript\u3067\u5909\u6570\u3092\u4f5c\u308b\u65b9\u6cd5\u3067\u3059\u304c\u3001\u57fa\u672c\u7684\u306b\u306f\u3010let\u3011\u304b\u3010const\u3011\u306e\u3069\u3061\u3089\u304b\u3092\u4f7f\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u9055\u3044\u306b\u3064\u3044\u3066\u7c21\u5358\u306b\u30dd\u30a4\u30f3\u30c8\u3060\u3051\u7d39\u4ecb\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<div class=\"box01\">\n<ul>\n<li>\u3010let\u3011\u5024\u306e\u518d\u4ee3\u5165\u306f\u3067\u304d\u308b\u304c\u540c\u540d\u5909\u6570\u306e\u518d\u5ba3\u8a00\u306f\u3067\u304d\u306a\u3044<\/li>\n<li>\u3010const\u3011\u5024\u306e\u518d\u4ee3\u5165\u3082\u540c\u540d\u5909\u6570\u306e\u518d\u5ba3\u8a00\u3082\u3067\u304d\u306a\u3044<\/li>\n<\/ul>\n<\/div>\n<p>\u4e0a\u8a18\u306e\u5185\u5bb9\u304b\u3089\u901a\u5e38\u306f\u3059\u3079\u3066const\u3067\u5909\u6570\u3092\u4f5c\u308a\u3001\u3069\u3046\u3057\u3066\u3082<b>\u9014\u4e2d\u3067\u5024\u3092\u5909\u66f4\u3059\u308b\u5834\u5408<\/b>\u306e\u307flet\u3092\u4f7f\u3046\u3068\u3044\u3046\u306e\u304c\u57fa\u672c\u30bb\u30aa\u30ea\u30fc\u306b\u306a\u308a\u307e\u3059\u3002\u307e\u305f\u3001const\u306f\u518d\u4ee3\u5165\u30fb\u518d\u5ba3\u8a00\u3067\u304d\u306a\u3044\u3053\u3068\u304b\u3089\u3010\u5b9a\u6570\u3011\u3092\u4f5c\u308a\u305f\u3044\u6642\u306b\u3082\u6d3b\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<pre class=\"lang:js decode:true\">\r\nlet name = '\u592a\u90ce';\r\nname = '\u4e8c\u90ce';\r\n\r\nconst age = 30;\r\nage = 35;\r\n<\/pre>\n<p>\u5909\u6570name\u306flet\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u6700\u7d42\u7684\u306b\u5909\u6570\u306e\u4e2d\u8eab\u306f\u3010\u4e8c\u90ce\u3011\u306b\u306a\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u5909\u6570age\u306fconst\u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u4e0a\u8a18\u306e\u3088\u3046\u306b\u5024\u3092\u518d\u4ee3\u5165\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u30a8\u30e9\u30fc\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u914d\u5217\u3092\u5b9a\u7fa9\u3059\u308b\u5834\u5408\u306b\u304a\u3044\u3066\u3082\u3001\u540c\u69d8\u306blet \/ const\u3092\u5229\u7528\u3059\u308b\u306e\u3067\u3059\u304c\u6ce8\u610f\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u308c\u306f\u3001const\u3067\u5b9a\u7fa9\u3057\u305f\u3068\u3057\u3066\u3082\u914d\u5217\u8981\u7d20\u306e\u4e2d\u8eab\u81ea\u4f53\u306f\u5909\u66f4\u304c\u3067\u304d\u308b\u3068\u3044\u3046\u70b9\u3067\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst items = [1,2,3,4,5];\r\n\r\nitems[0] = 9;\r\nconsole.log(items);\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"theme:dark-terminal lang:default decode:true\">\r\n[9,2,3,4,5]\r\n<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u914d\u5217items\u3092const\u3067\u5b9a\u7fa9\u3057\u3066\u304a\u308a\u3001\u305d\u306e0\u756a\u76ee\u306e\u8981\u7d20\u3092\u5909\u66f4\u3057\u3066\u3044\u307e\u3059\u304c\u5b9f\u884c\u7d50\u679c\u3092\u898b\u308b\u3068\u3057\u3063\u304b\u308a\u3068\u5909\u66f4\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001\u914d\u5217\u8981\u7d20\u3067\u306f\u306a\u304f\u914d\u5217\u306e\u5024\u305d\u306e\u3082\u3092\u6b21\u306e\u3088\u3046\u306b\u5909\u66f4\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst items = [1,2,3,4,5];\r\n\r\nitems = ['\u30ea\u30f3\u30b4', '\u30d0\u30ca\u30ca', '\u30e1\u30ed\u30f3'];\r\n<\/pre>\n<p>\u3053\u306e\u4f8b\u3060\u3068\u5b9f\u884c\u6642\u306b\u30a8\u30e9\u30fc\u3068\u306a\u308a\u307e\u3059\u3002\u3064\u307e\u308a\u3001const\u306f\u3042\u304f\u307e\u3067\u5024\u306e\u518d\u4ee3\u5165\u3092\u4e0d\u53ef\u3068\u3057\u3066\u3044\u308b\u3060\u3051\u306a\u306e\u3067\u6ce8\u610f\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u3053\u306e\u4ed5\u7d44\u307f\u306f\u5024\u304c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3042\u3063\u3066\u3082\u540c\u3058\u3067\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst users = {\r\n  name: '\u592a\u90ce',\r\n  age: 30\r\n}\r\n\r\nusers.age = 35;\r\nconsole.log(users);\r\n\r\nusers = {};\r\nconsole.log(users);\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"theme:dark-terminal lang:default decode:true\">\r\nconst users = {\r\n  name: '\u592a\u90ce',\r\n  age: 35\r\n}\r\n\r\n\u30a8\u30e9\u30fc:Assignment to constant variable.\r\n<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001const\u3067\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5185\u306e\u5024\u306f\u5909\u66f4\u3067\u304d\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u540c\u69d8\u306b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u81ea\u4f53\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u3053\u3068\u3082\u8a3c\u660e\u3057\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n<p>\u4ed6\u306b\u3082\u3001\u5909\u6570\u3084\u914d\u5217\u306a\u3069\u306b\u3064\u3044\u3066\u3088\u308a\u5b9f\u8df5\u7684\u306a\u7df4\u7fd2\u554f\u984c\u3092\u6b21\u306e\u8a18\u4e8b\u3067\u307e\u3068\u3081\u3066\u3044\u308b\u306e\u3067\u3001\u305c\u3072\u5408\u308f\u305b\u3066\u6311\u6226\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/100260\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2022\/12\/howto-01-2024-03-21T222115.635-150x85.png\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">JavaScript\u306e\u57fa\u672c\u4f8b\u984c\u96c6\uff01\u5909\u6570\u30fb\u914d\u5217\u30fb\u95a2\u6570\u306a\u3069\u3092\u4e00\u6c17\u306b\u30de\u30b9\u30bf\u30fc\uff01<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2025\u5e7412\u670826\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h3>\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306e\u4f5c\u308a\u65b9<\/h3>\n<p>JavaScript\u3067\u306f\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306b\u4f7f\u3048\u308b\u69cb\u6587\u3068\u3057\u3066\u3001while \/ switch \/ for\u306a\u3069\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3059\u304c\u3001\u3082\u3063\u3068\u3082\u57fa\u672c\u3067\u4f7f\u3046\u983b\u5ea6\u3082\u9ad8\u3044\u3010for\u6587\u3011\u306e\u30dd\u30a4\u30f3\u30c8\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n<p>for\u6587\u306f\u3010\u521d\u671f\u5024\u3011\u3010\u6761\u4ef6\u5f0f\u3011\u3010\u5897\u6e1b\u5024\u3011\u3068\u3044\u30463\u3064\u306e\u5f15\u6570\u3092\u4f7f\u3063\u3066\u3001\u3055\u307e\u3056\u307e\u306a\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u304c\u884c\u3048\u308b\u69cb\u6587\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nfor (  \u521d\u671f\u5024;  \u6761\u4ef6\u5f0f;  \u5897\u6e1b\u5024  ) {\r\n \r\n  \/\/ \u7e70\u308a\u8fd4\u3059\u51e6\u7406\u3092\u66f8\u304f\r\n \r\n}\r\n<\/pre>\n<div class=\"box01\">\n<ul>\n<li>\u521d\u671f\u5024\uff1a\u7e70\u308a\u8fd4\u3059\u56de\u6570\u306e\u521d\u671f\u5024<\/li>\n<li>\u6761\u4ef6\u5f0f\uff1a\u7e70\u308a\u8fd4\u3057\u3092\u7d99\u7d9a\u3059\u308b\u6761\u4ef6<\/li>\n<li>\u5897\u6e1b\u5024\uff1a\u300c\u521d\u671f\u5024\u300d\u3092\u5897\u6e1b\u3059\u308b\u5f0f<\/li>\n<\/ul>\n<\/div>\n<p>\u7e70\u308a\u8fd4\u3059\u56de\u6570\u3092\u6307\u5b9a\u3067\u304d\u308b\u3068\u3044\u3046\u6027\u8cea\u304b\u3089\u3001\u914d\u5217\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e2d\u8eab\u3092\u53d6\u5f97\u30fb\u5909\u66f4\u3059\u308b\u3088\u3046\u306a\u30b1\u30fc\u30b9\u3067\u3082\u3088\u304f\u4f7f\u308f\u308c\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u914d\u5217\u306b\u683c\u7d0d\u3055\u308c\u305f\u540d\u524d\u3092\u3059\u3079\u3066\u53d6\u5f97\u3059\u308b\u306b\u306f\u6b21\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst lists = ['\u4f50\u85e4', '\u4f0a\u85e4', '\u9234\u6728'];\r\n \r\nfor (let i = 0;  i < lists.length;  i++) {\r\n \r\n    console.log (lists[ i ]);\r\n \r\n}\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"theme:dark-terminal lang:default decode:true\">\r\n\u4f50\u85e4\r\n\u4f0a\u85e4\r\n\u9234\u6728\r\n<\/pre>\n<p>\u3010\u914d\u5217\u540d.length\u3011\u3068\u8a18\u8ff0\u3059\u308b\u3053\u3068\u3067\u3001\u914d\u5217\u5185\u306b\u683c\u7d0d\u3055\u308c\u3066\u3044\u308b\u8981\u7d20\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u6570\u304c\u53d6\u5f97\u3067\u304d\u308b\u306e\u3067\u6761\u4ef6\u5f0f\u306b\u3082\u4f7f\u3048\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u6ce8\u610f\u70b9\u3068\u3057\u3066\u3001\u4e0a\u8a18\u30b5\u30f3\u30d7\u30eb\u306e\u521d\u671f\u5024\u3092\u5b9a\u7fa9\u3059\u308b\u969b\u306b<b>var\u3067\u306f\u306a\u304flet\u3092\u5229\u7528\u3057\u3066\u3044\u308b\u70b9<\/b>\u306b\u6ce8\u76ee\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u524d\u7ae0\u3067\u3082\u89e6\u308c\u307e\u3057\u305f\u304c\u3001\u73fe\u5728\u3067\u306fvar\u306f\u4f7f\u308f\u305a\u306blet \/ const\u3092\u5229\u7528\u3057\u3001\u5024\u306e\u5909\u66f4\u304c\u8003\u3048\u3089\u308c\u308b\u5834\u5408\u306flet\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306f\u5024\u304c\u5909\u5316\u3059\u308b\u3053\u3068\u3092\u660e\u78ba\u5316\u3059\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306b\u304a\u3066\u3044\u306f\u3055\u3089\u306b\u91cd\u8981\u306a\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7\u306e\u5229\u70b9\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nfor(var i=0; i<10; i++) {}\r\n\r\nconsole.log(i);\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"theme:dark-terminal lang:default decode:true\">\r\n10\r\n<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u521d\u671f\u5024\u304cvar\u3092\u5229\u7528\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3059\u304c\u3001\u5b9f\u884c\u7d50\u679c\u3092\u898b\u308b\u3068\u7e70\u308a\u8fd4\u3057\u76f4\u5f8c\u306e10\u3068\u3044\u3046\u6570\u5024\u304c\u51fa\u529b\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u3064\u307e\u308a\u3001for\u6587\u304c\u7d42\u4e86\u3057\u305f\u3042\u3068\u3082\u5909\u6570i\u306b\u306f\u5024\u304c\u6b8b\u3063\u3066\u3044\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3067\u306f\u6b21\u306blet\u3092\u4f7f\u3063\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nfor(let i=0; i<10; i++) {}\r\n\r\nconsole.log(i);\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"theme:dark-terminal lang:default decode:true\">\r\n\u30a8\u30e9\u30fc\uff1ai is not defined\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\u306f\u300c\u5909\u6570i\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u300d\u3068\u3044\u3046\u5185\u5bb9\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001let\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u5909\u6570\u306f<b>for\u6587\u306e\u4e2d\u3060\u3051\u3057\u304b\u6709\u52b9\u3067\u306f\u306a\u3044<\/b>\u3068\u3044\u3046\u610f\u5473\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u304c\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7\u3067\u3042\u308a\u3001\u5909\u6570\u304c\u5f71\u97ff\u3059\u308b\u7bc4\u56f2\u304c\u7279\u5b9a\u306e\u51e6\u7406\u5185\u3060\u3051\u3067\u5b8c\u7d50\u3067\u304d\u308b\u306e\u3067\u9593\u9055\u3044\u304c\u5c11\u306a\u304f\u3066\u6e08\u3080\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u4ed6\u306b\u3082\u3001for\u306b\u3088\u308b\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306ffor-in \/ for-of \/ forEach\u306a\u3069\u306e\u69cb\u6587\u3082\u63d0\u4f9b\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u3088\u308a\u6df1\u3044\u77e5\u8b58\u3092\u5b66\u3073\u305f\u3044\u65b9\u306f\u6b21\u306e\u8a18\u4e8b\u3067\u4f53\u7cfb\u7684\u306b\u307e\u3068\u3081\u3066\u3044\u308b\u306e\u3067\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/20777\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/08\/javascript-tutorial-top-150x86.png\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010JavaScript\u5165\u9580\u3011for\u6587\u306e\u30eb\u30fc\u30d7\u51e6\u7406\u306f\u3053\u308c\u3067\u5b8c\u74a7! for-in \/ for-of \/ forEach\u6587\u3082\u5fb9\u5e95\u89e3\u8aac\uff01<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2025\u5e7412\u670829\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h3>\u6761\u4ef6\u5206\u5c90\u51e6\u7406\u306e\u4f5c\u308a\u65b9<\/h3>\n<p>\u6761\u4ef6\u5206\u5c90\u3068\u306f1\u3064\u306e\u51e6\u7406\u3092\u5b9f\u884c\u3057\u305f\u7d50\u679c\u3092\u5143\u306b\u6b21\u306e\u51e6\u7406\u3092\u9078\u629e\u3059\u308b\u3068\u3044\u3046\u30a4\u30e1\u30fc\u30b8\u306b\u306a\u308a\u307e\u3059\u3002JavaScript\u306f\u57fa\u672c\u7684\u306b\u30b7\u30f3\u30b0\u30eb\u30b9\u30ec\u30c3\u30c9\u306a\u306e\u3067\u3001\u901a\u5e38\u306f<b>\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u4e0a\u304b\u3089\u4e0b\u3078<\/b>\u9806\u756a\u306b\u5b9f\u884c\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001\u305d\u306e\u9014\u4e2d\u3067A\u3068\u3044\u3046\u51e6\u7406\u306b\u3059\u308b\u304bB\u3068\u3044\u3046\u51e6\u7406\u306b\u3059\u308b\u304b\u306a\u3069\u3001\u3055\u307e\u3056\u307e\u306a\u51e6\u7406\u3092\u9078\u629e\u3057\u3066\u5b9f\u884c\u3092\u5206\u5c90\u3067\u304d\u308b\u306e\u304c\u6761\u4ef6\u5206\u5c90\u51e6\u7406\u306e\u30dd\u30a4\u30f3\u30c8\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>JavaScript\u3067\u306f\u3001\u4e3b\u306bif \/ switch\u306a\u3069\u306e\u69cb\u6587\u304c\u63d0\u4f9b\u3055\u308c\u3066\u304a\u308a\u3001\u3082\u3063\u3068\u3082\u4f7f\u308f\u308c\u308b\u306e\u304cIF\u6587\u3068\u8a00\u3048\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nif( \u6761\u4ef6\u5f0f ) {\r\n \r\n    \/\/\u6761\u4ef6\u304ctrue\u306e\u5834\u5408\u306e\u51e6\u7406\r\n \r\n} else if( \u6761\u4ef6\u5f0f ) {\r\n \r\n    \/\/1\u3064\u524d\u306e\u6761\u4ef6\u304cfalse\u3001\u672c\u6761\u4ef6\u304ctrue\u306e\u5834\u5408\u306e\u51e6\u7406\r\n \r\n} else {\r\n \r\n    \/\/\u3044\u305a\u308c\u306e\u6761\u4ef6\u5f0f\u306b\u3082\u5f53\u3066\u306f\u307e\u3089\u306a\u3044\u5834\u5408\u306e\u51e6\u7406\r\n \r\n}\r\n<\/pre>\n<p>\u6761\u4ef6\u5f0f\u306e\u7d50\u679c\u304ctrue\u306b\u306a\u308b\u5834\u5408\u306e\u307f\u3001\u8a18\u8ff0\u3055\u308c\u3066\u3044\u308b\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u308b\u308f\u3051\u3067\u3059\u3002\u3010else if\u3011\u3010else\u3011\u306b\u3064\u3044\u3066\u306fIF\u6587\u306e\u51e6\u7406\u304cfalse\u306b\u306a\u3063\u305f\u5834\u5408\u306b\u5b9f\u884c\u3055\u308c\u308b\u306e\u3067\u3001\u3053\u3053\u3067\u51e6\u7406\u3092\u5206\u5c90\u3067\u304d\u308b\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u306d\uff08\u7701\u7565\u53ef\u80fd\uff09<\/p>\n<p>\u305f\u3060\u3057\u3001\u51e6\u7406\u3092\u5206\u5c90\u3055\u305b\u308b\u5834\u5408\u306f\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<p>\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<pre class=\"lang:js decode:true\">\r\nvar weight = 60; \/\/ \u73fe\u5728\u306e\u4f53\u91cd\r\n \r\nif(weight < 70) {\r\n \r\n  console.log('\u3042\u3068\u3082\u3046\u5c11\u3057\u3067\u3059\uff01');\r\n \r\n} else if(weight < 65){\r\n \r\n  console.log('\u30c0\u30a4\u30a8\u30c3\u30c8\u6210\u529f\u3067\u3059\uff01');\r\n \r\n}\r\n<\/pre>\n<p>\u5909\u6570weight\u306e\u5024\u306f60\u306a\u306e\u3067\u3001\u6700\u521d\u306eIF\u6587\u304ctrue\u3068\u306a\u308a\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u3057\u304b\u3057\u3001else if\u306e\u6761\u4ef6\u5f0f\u306f65\u3088\u308a\u3082\u5c0f\u3055\u3044\u5834\u5408\u3067\u3059\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001\u672c\u5f53\u306felse if\u306e\u51e6\u7406\u3092\u5b9f\u884c\u3057\u305f\u3044\u306e\u306b<b>\u6700\u521d\u306eIF\u6587\u304c\u6761\u4ef6\u306b\u5408\u81f4\u3059\u308b\u305f\u3081<\/b>\u5b9f\u884c\u3055\u308c\u3066\u3057\u307e\u3046\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u672c\u6765\u306f\u6b21\u306e\u3088\u3046\u306b\u6761\u4ef6\u5206\u5c90\u3092\u8a18\u8ff0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nvar weight = 60; \/\/ \u73fe\u5728\u306e\u4f53\u91cd\r\n \r\nif(weight < 65) {\r\n \r\n  console.log('\u30c0\u30a4\u30a8\u30c3\u30c8\u6210\u529f\u3067\u3059\uff01');\r\n \r\n} else if(weight < 70){\r\n \r\n  console.log('\u3042\u3068\u3082\u3046\u5c11\u3057\u3067\u3059\uff01');\r\n \r\n}\r\n<\/pre>\n<p>\u3053\u306e\u4f8b\u306f\u3001\u5148\u307b\u3069\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306e\u6761\u4ef6\u3092\u5165\u308c\u66ff\u3048\u305f\u3060\u3051\u3067\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u6b63\u3057\u3044\u6761\u4ef6\u5f0f\u304c\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u6761\u4ef6\u5206\u5c90\u306f\u6700\u521d\u306b\u5408\u81f4\u3057\u305f\u51e6\u7406\u3092\u5b9f\u884c\u3057\u3066\u7d42\u4e86\u3059\u308b\u3068\u3044\u3046\u3053\u3068\u3092\u5fd8\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002\u307e\u305f\u3001IF\u6587\u306e\u57fa\u672c\u304b\u3089\u5fdc\u7528\u307e\u3067\u3092\u6b21\u306e\u8a18\u4e8b\u3067\u4f53\u7cfb\u7684\u306b\u307e\u3068\u3081\u3066\u3044\u308b\u306e\u3067\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/20736\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">JavaScript\u3067IF\u6587\u306e\u4f7f\u3044\u65b9\u304b\u3089if&#8230;else if\u306e\u6d3b\u7528\u8853\u307e\u3067\u3092\u5fb9\u5e95\u89e3\u8aac<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h2>JavaScript\u306e\u5fdc\u7528<\/h2>\n<p>\u3053\u306e\u7ae0\u3067\u306f\u3001\u3082\u3046\u5c11\u3057\u8e0f\u307f\u8fbc\u3093\u3060JavaScript\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u4e3b\u306b\u3001\u95a2\u6570\u3084\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3092\u6d3b\u7528\u3057\u305f\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u624b\u6cd5\u306b\u3064\u3044\u3066\u5b66\u3093\u3067\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3>\u95a2\u6570\u306e\u4f7f\u3044\u65b9<\/h3>\n<p>\u95a2\u6570\u306f\u8907\u96d1\u306a\u51e6\u7406\u30921\u3064\u306b\u307e\u3068\u3081\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3001\u518d\u5229\u7528\u6027\u3082\u9ad8\u304f\u306a\u308b\u306e\u3067\u30b3\u30fc\u30c9\u306e\u898b\u901a\u3057\u304c\u826f\u304f\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u4f7f\u3044\u3053\u306a\u305b\u308b\u3088\u3046\u306b\u306a\u308c\u3070\u52b9\u7387\u306e\u826f\u3044\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9\u3068\u3057\u3066\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nfunction sample() {\r\n \r\n    \/\/\u3053\u3053\u306b\u51e6\u7406\u3092\u66f8\u3044\u3066\u3044\u304f\r\n \r\n}\r\n<\/pre>\n<p>function\u8a18\u8ff0\u306e\u3042\u3068\u306b\u597d\u304d\u306a\u95a2\u6570\u540d\u3092\u6307\u5b9a\u3057\u3066\u3001\u5b9f\u884c\u3057\u305f\u3044\u51e6\u7406\u3092{ }\u306e\u4e2d\u306b\u633f\u5165\u3057\u307e\u3059\u3002\u547c\u3073\u51fa\u3059\u6642\u306f\u3010sample()\u3011\u306e\u3088\u3046\u306b\u95a2\u6570\u540d\u3068()\u3092\u4ed8\u4e0e\u3057\u3066\u5b9f\u884c\u3059\u308c\u3070\u826f\u3044\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u7121\u540d\u95a2\u6570\u30fb\u533f\u540d\u95a2\u6570\u3068\u547c\u3070\u308c\u308b\u3088\u3046\u306b\u95a2\u6570\u3092\u5909\u6570\u306b\u4ee3\u5165\u3059\u308b\u66f8\u304d\u65b9\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst sample = function() {\r\n \r\n    \/\/\u3053\u3053\u306b\u51e6\u7406\u3092\u66f8\u3044\u3066\u3044\u304f\r\n \r\n}\r\n<\/pre>\n<p>JavaScript\u3067\u306f\u95a2\u6570\u3082\u5024\u3068\u540c\u3058\u3088\u3046\u306a\u6271\u3044\u65b9\u306b\u306a\u308b\u305f\u3081\u3001\u5909\u6570\u3078\u4ee3\u5165\u3057\u3066\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u6700\u8fd1\u3067\u306f\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u304c\u4e00\u822c\u7684\u306b\u306a\u3063\u3066\u304d\u305f\u306e\u3067\u6b21\u306e\u3088\u3046\u306a\u7701\u7565\u8a18\u8ff0\u3067\u3082\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst sample = () => {\r\n \r\n    \/\/\u3053\u3053\u306b\u51e6\u7406\u3092\u66f8\u3044\u3066\u3044\u304f\r\n \r\n}\r\n<\/pre>\n<p>function\u306e\u8a18\u8ff0\u3092\u3059\u308b\u4ee3\u308f\u308a\u306b\u3010() => {}\u3011\u3068\u3044\u3046\u30a2\u30ed\u30fc\u95a2\u6570\u304c\u5229\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001\u95a2\u6570\u306f<b>\u5f15\u6570<\/b>\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3001\u95a2\u6570\u3092\u5b9f\u884c\u3059\u308b\u969b\u306b\u7279\u5b9a\u306e\u5024\u3092\u95a2\u6570\u306b\u6e21\u3057\u3066\u51e6\u7406\u304c\u3067\u304d\u308b\u306e\u3067\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst sample = (name) => {\r\n  console.log('\u3053\u3093\u306b\u3061\u306f\u3001' + name + '\u3055\u3093');\r\n}\r\n  \r\nsample('\u592a\u90ce');\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"theme:dark-terminal lang:default decode:true\">\r\n\u3053\u3093\u306b\u3061\u306f\u3001\u592a\u90ce\u3055\u3093\r\n<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u5f15\u6570\u3068\u3057\u3066\u3010name\u3011\u3068\u3044\u3046\u6587\u5b57\u5217\u3092\u95a2\u6570\u306b\u6e21\u3057\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002\u305d\u3057\u3066\u3001\u5f15\u6570name\u306f\u95a2\u6570\u5185\u3067\u5229\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u3082\u30461\u3064\u95a2\u6570\u306e\u91cd\u8981\u306a\u6a5f\u80fd\u3068\u3057\u3066 \u3010\u8fd4\u308a\u5024\u3011\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306freturn\u3092\u4f7f\u3046\u3053\u3068\u3067\u4efb\u610f\u306e\u5024\u3092\u8fd4\u3059\u6a5f\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst sample = (name) => {\r\n  return '\u3053\u3093\u306b\u3061\u306f\u3001' + name + '\u3055\u3093';\r\n}\r\n  \r\nconsole.log(sample('\u592a\u90ce'));\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"theme:dark-terminal lang:default decode:true\">\r\n\u3053\u3093\u306b\u3061\u306f\u3001\u592a\u90ce\u3055\u3093\r\n<\/pre>\n<p>\u5148\u307b\u3069\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092return\u306b\u7f6e\u304d\u63db\u3048\u305f\u3082\u306e\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001sample()\u3092\u5b9f\u884c\u3059\u308b\u3068return\u306b\u3088\u3063\u3066\u6587\u5b57\u5217\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001console.log()\u3092\u5229\u7528\u3059\u308c\u3070\u95a2\u6570\u3092\u5b9f\u884c\u3059\u308b\u3060\u3051\u3067\u6587\u5b57\u5217\u304c\u51fa\u529b\u3055\u308c\u308b\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u95a2\u6570\u306f\u7528\u9014\u304c\u5927\u5909\u591a\u3044\u305f\u3081\u57fa\u790e\u304b\u3089\u5fdc\u7528\u307e\u3067\u5e45\u5e83\u3044\u5b66\u7fd2\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u304c\u3001\u6b21\u306e\u8a18\u4e8b\u3067\u306f\u305d\u306e\u8a73\u7d30\u3092\u307e\u3068\u3081\u3066\u3044\u308b\u306e\u3067\u30ac\u30a4\u30c9\u4ee3\u308f\u308a\u306b\u305c\u3072\u4e00\u8aad\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/31671\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/08\/javascript-tutorial-top-150x86.png\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010JavaScript\u5165\u9580\u3011function(\u95a2\u6570)\u306e\u4f7f\u3044\u65b9\u3001\u547c\u3073\u51fa\u3057\u30fb\u623b\u308a\u5024\u306a\u3069\u7dcf\u307e\u3068\u3081\uff01<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2025\u5e7412\u670829\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h3>\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306e\u4f7f\u3044\u65b9<\/h3>\n<p>JavaScript\u306f\u4ed6\u306e\u8a00\u8a9e\uff08Java \/ C#\u306a\u3069\uff09\u306e\u3088\u3046\u306a\u30af\u30e9\u30b9\u30d9\u30fc\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u3067\u306f\u306a\u304f\u3001\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u30d9\u30fc\u30b9\u306e\u8a00\u8a9e\u3060\u3068\u8a00\u308f\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306e\u672c\u5f53\u306e\u610f\u5473\u3092\u3054\u5b58\u77e5\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306f\u7c21\u5358\u306b\u8a00\u3048\u3070\u6700\u5c0f\u9650\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30c7\u30fc\u30bf\u306e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u306e\u3088\u3046\u306a\u3082\u306e\u3068\u30a4\u30e1\u30fc\u30b8\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u305d\u3057\u3066\u3001\u305d\u306e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u30b3\u30d4\u30fc\u3057\u3066\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u308c\u308b\u306e\u304c\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u30d9\u30fc\u30b9\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/08\/javascript-prototype-img1.jpg\" alt=\"\" width=\"600\" height=\"300\" class=\"alignnone size-full wp-image-105364\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/08\/javascript-prototype-img1.jpg 600w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/08\/javascript-prototype-img1-150x75.jpg 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/08\/javascript-prototype-img1-300x150.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><br \/>\n<div class=\"img-caption\">\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306e\u30a4\u30e1\u30fc\u30b8\u56f3<\/div><\/p>\n<p>\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3092\u5229\u7528\u3059\u308b\u30e1\u30ea\u30c3\u30c8\u3068\u3057\u3066\u3001\u307e\u305a\u306f\u30e1\u30e2\u30ea\u306e\u7bc0\u7d04\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u4f5c\u6210\u3059\u308b\u6642\u306b\u3001\u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u30e1\u30bd\u30c3\u30c9\u3092\u4e00\u7dd2\u306b\u5b9a\u7fa9\u3059\u308b\u3088\u3046\u306a\u30d1\u30bf\u30fc\u30f3\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst User = function(name, age) {\r\n    \/\/\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u5b9a\u7fa9\u3059\u308b\r\n    this.name = name;\r\n    this.age = age;\r\n    \r\n \r\n    \/\/\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\r\n    this.getName = function() {\r\n        return this.name;\r\n    }\r\n}\r\n<\/pre>\n<p>\u3053\u308c\u3067\u3082\u554f\u984c\u306a\u304f\u6a5f\u80fd\u3057\u307e\u3059\u304c\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u305f\u3073\u306b\u30d7\u30ed\u30d1\u30c6\u30a3\u30fb\u30e1\u30bd\u30c3\u30c9\u304c\u4e21\u65b9\u4e00\u7dd2\u306b\u30b3\u30d4\u30fc\u3055\u308c\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3092\u4f7f\u3063\u3066\u30e1\u30bd\u30c3\u30c9\u306e\u5b9a\u7fa9\u3092\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst User = function(name, age) {\r\n    this.name = name;\r\n    this.age = age;\r\n}\r\n \r\nUser.prototype.getName = function() {\r\n    return this.name;\r\n}\r\n<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3092\u5b9a\u7fa9\u3059\u308b\u6642\u306b\u30d7\u30ed\u30d1\u30c6\u30a3\u3060\u3051\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u306d\u3002\u30e1\u30bd\u30c3\u30c9\u306f\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3092\u5229\u7528\u3057\u3066\u5225\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306b\u3088\u308a\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u3068\u30d7\u30ed\u30d1\u30c6\u30a3\u3060\u3051\u304c\u30b3\u30d4\u30fc\u3055\u308c\u307e\u3059\u3002\u30e1\u30bd\u30c3\u30c9\u306f\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306b\u5b9a\u7fa9\u3057\u3066\u3044\u308b\u306e\u3067\u3001<b>\u3069\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u304b\u3089\u3067\u3082\u53c2\u7167\u3067\u304d\u308b<\/b>\u308f\u3051\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u3059\u3079\u3066\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3068\u3044\u3046\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3092\u5143\u306b\u3057\u3066\u3044\u308b\u304b\u3089\u3053\u305d\u306e\u6d3b\u7528\u30ef\u30b6\u3068\u8a00\u3048\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u307e\u305f\u3001\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u7d99\u627f\u3082\u7c21\u5358\u306b\u884c\u3048\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst User = function() {};\r\nconst Member = function() {};\r\n\r\n\/\/User\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092Member\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306b\u4ee3\u5165\r\nMember.prototype = new User();\r\n <\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u7a7a\u3063\u307d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8User\u3068Member\u3092\u4f5c\u6210\u3057\u3066\u3044\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u3053\u306eUser\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092Member\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306b\u4ee3\u5165\u3057\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308b\u3067\u3057\u3087\u3046\u304b\uff1f<\/p>\n<p>\u5b9f\u306f\u3053\u306e1\u884c\u3060\u3051\u3067\u7d99\u627f\u304c\u51fa\u6765\u3066\u3044\u308b\u306e\u3067\u3059\u3002<\/p>\n<p>\u305d\u306e\u8a3c\u62e0\u306b\u6b21\u306e\u30b5\u30f3\u30d7\u30eb\u4f8b\u3092\u898b\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst User = function() {};\r\nconst Member = function() {};\r\n \r\nUser.prototype.hello = function() {\r\n    return '\u3053\u3093\u306b\u3061\u306f\uff01';\r\n}\r\n \r\n\/\/\u7d99\u627f\u3092\u5b9f\u65bd\r\nMember.prototype = new User();\r\n \r\nconst hanako = new Member();\r\n \r\n\/\/Member\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306bhello()\u3092\u5b9f\u884c\r\nconsole.log( hanako.hello() );\r\n<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c<\/p>\n<pre class=\"theme:dark-terminal lang:default decode:true\">\r\n\u3053\u3093\u306b\u3061\u306f\uff01\r\n<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001User\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3060\u3051\u306bhello()\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001\u7d99\u627f\u3092\u884c\u3063\u305f\u3042\u3068\u306bMember\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u308a\u307e\u3059\u3002Member\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u7a7a\u3063\u307d\u306e\u306f\u305a\u3067\u3059\u304c\u3001hello()\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u884c\u3067\u304d\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002<\/p>\n<p>\u3064\u307e\u308a\u3001\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3092\u30d9\u30fc\u30b9\u306b\u3057\u3066\u3044\u308bJavaScript\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u3001<b>\u305d\u308c\u305e\u308c\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3067\u7e4b\u304c\u3063\u3066\u3044\u308b<\/b>\u3068\u3082\u8a00\u3048\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<p>\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u3092\u3055\u3089\u306b\u5b66\u7fd2\u3057\u305f\u3044\u65b9\u306f\u3001\u6b21\u306e\u8a18\u4e8b\u3067\u57fa\u672c\u304b\u3089\u5fdc\u7528\u307e\u3067\u3092\u307e\u3068\u3081\u3066\u3044\u308b\u306e\u3067\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/47722\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/04\/javascript-prototype-top2-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010JavaScript\u5165\u9580\u3011\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7(prototype)\u306e\u4f7f\u3044\u65b9\u3068\u7d99\u627f\u307e\u3068\u3081\uff01<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h2>\u5b66\u7fd2\u5411\u3051\u30b5\u30fc\u30d3\u30b9<\/h2>\n<p>\u3053\u306e\u7ae0\u3067\u306f\u3001JavaScript\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u5b66\u7fd2\u3067\u304d\u308bWeb\u30b5\u30fc\u30d3\u30b9\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002\u4e3b\u306b\u3001\u30b2\u30fc\u30e0\u611f\u899a\u3067\u5b66\u3079\u308b\u30b5\u30fc\u30d3\u30b9\u3001\u52d5\u753b\u3067\u5b66\u7fd2\u3067\u304d\u308b\u30b5\u30fc\u30d3\u30b9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3>\u30b3\u30fc\u30c9\u30e2\u30f3\u30ad\u30fc<\/h3>\n<p>\u3010\u30b3\u30fc\u30c9\u30e2\u30f3\u30ad\u30fc\u3011<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/08\/12.png\" alt=\"\" width=\"800\" height=\"400\" class=\"alignnone size-full wp-image-105365\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/08\/12.png 800w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/08\/12-150x75.png 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/08\/12-300x150.png 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/08\/12-640x320.png 640w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><br \/>\n<div class=\"img-caption\">URL\uff1a<a href=\"https:\/\/www.playcodemonkey.com\/\">https:\/\/www.playcodemonkey.com\/<\/a><\/div><\/p>\n<p>\u304a\u733f\u306e\u30ad\u30e3\u30e9\u30af\u30bf\u30fc\u3092\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u3088\u3063\u3066\u64cd\u4f5c\u3057\u3001\u6307\u5b9a\u3055\u308c\u305f\u30d0\u30ca\u30ca\u3092\u3059\u3079\u3066\u56de\u53ce\u3057\u3066\u3044\u304f\u3068\u3044\u3046\u30b2\u30fc\u30e0\u611f\u899a\u3067\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u5b66\u7fd2\u304c\u3067\u304d\u308b\u30b5\u30fc\u30d3\u30b9\u3067\u3059\u3002<\/p>\n<p>\u516830\u30b3\u30fc\u30b9\u304c\u7121\u6599\u3067\u63d0\u4f9b\u3055\u308c\u3066\u304a\u308a\u3001\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u8c4a\u5bcc\u306a\u30b9\u30c6\u30fc\u30b8\u3067\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306a\u3069\u57fa\u672c\u7684\u306a\u69cb\u6587\u3092\u7121\u7406\u306a\u304f\u5b66\u3079\u308b\u3088\u3046\u306b\u69cb\u6210\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30ad\u30e3\u30e9\u30af\u30bf\u30fc\u3092\u3069\u3046\u3084\u3063\u305f\u3089\u52b9\u7387\u3088\u304f\u64cd\u4f5c\u3067\u304d\u308b\u304b\u3092\u8003\u3048\u308b\u3053\u3068\u3067\u3001\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u6700\u9069\u5316\u3082\u540c\u6642\u306b\u3067\u304d\u308b\u306e\u304c\u9b45\u529b\u3067\u3057\u3087\u3046\u3002<\/p>\n<h3>CodeCombat<\/h3>\n<p>\u3010CodeCombat\u3011<br \/>\n<img decoding=\"async\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/08\/41.png\" alt=\"\" width=\"800\" height=\"400\" class=\"alignnone size-full wp-image-105366\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/08\/41.png 800w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/08\/41-150x75.png 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/08\/41-300x150.png 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/08\/41-640x320.png 640w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><br \/>\n<div class=\"img-caption\">URL\uff1a<a href=\"https:\/\/codecombat.com\/play\">https:\/\/codecombat.com\/play<\/a><\/div><\/p>\n<p>\u672c\u683c\u7684\u306aRPG\u30b2\u30fc\u30e0\u3092\u30d9\u30fc\u30b9\u306b\u3001\u30ad\u30e3\u30e9\u30af\u30bf\u30fc\u3092\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u64cd\u4f5c\u3057\u306a\u304c\u3089\u6575\u3068\u6226\u3063\u305f\u308a\u5b9d\u7bb1\u3092\u958b\u3051\u305f\u308a\u3057\u3066\u5b66\u7fd2\u3067\u304d\u308b\u306e\u304c\u6700\u5927\u306e\u7279\u5fb4\u3067\u3059\u3002<\/p>\n<p>\u57fa\u672c\u7684\u306a\u69cb\u6587\u3084\u95a2\u6570\u30fb\u6761\u4ef6\u5206\u5c90\u306a\u3069\u3001\u3053\u306e\u30b2\u30fc\u30e0\u3067\u904a\u3076\u3060\u3051\u3067\u57fa\u672c\u7684\u306aJavaScript\u3092\u30de\u30b9\u30bf\u30fc\u3067\u304d\u308b\u3088\u3046\u306b\u5de5\u592b\u3055\u308c\u3066\u3044\u308b\u306e\u304c\u5370\u8c61\u7684\u3067\u3059\u3002100\u3092\u8d85\u3048\u308b\u591a\u5f69\u306a\u30b9\u30c6\u30fc\u30b8\u3092\u9032\u3080\u306b\u3064\u308c\u3066\u3001\u8981\u6c42\u3055\u308c\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3082\u96e3\u3057\u304f\u306a\u3063\u3066\u3044\u304f\u306e\u3067\u3068\u3066\u3082\u3084\u308a\u304c\u3044\u306e\u3042\u308b\u30b5\u30fc\u30d3\u30b9\u3068\u8a00\u3048\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u4eca\u56de\u306f\u3001JavaScript\u306e\u5b66\u7fd2\u306b\u304a\u3044\u3066\u521d\u5fc3\u8005\u304c\u8ab2\u984c\u306b\u611f\u3058\u308b\u30dd\u30a4\u30f3\u30c8\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u6700\u5f8c\u306b\u3001\u3082\u3046\u4e00\u5ea6\u30dd\u30a4\u30f3\u30c8\u3092\u304a\u3055\u3089\u3044\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<div class=\"box01\">\n<ul>\n<li>\u5909\u6570\u306flet \/ const\u3092\u4f7f\u3044\u3001for \/ if\u306b\u3088\u308b\u5236\u5fa1\u69cb\u6587\u3092\u4f7f\u3044\u3053\u306a\u305d\u3046<\/li>\n<li>\u30a2\u30ed\u30fc\u95a2\u6570\u3068\u30d7\u30ed\u30c8\u30bf\u30a4\u30d7\u306e\u6d3b\u7528\u3092\u899a\u3048\u308b\u3068\u52b9\u7387\u304c\u826f\u304f\u306a\u308b<\/li>\n<li>JavaScript\u3092\u5b66\u7fd2\u3067\u304d\u308bWeb\u30b5\u30fc\u30d3\u30b9\u3082\u6d3b\u7528\u3057\u3088\u3046<\/li>\n<\/ul>\n<\/div>\n<p>\u4e0a\u8a18\u5185\u5bb9\u3092\u8e0f\u307e\u3048\u3066\u3001\u305c\u3072\u81ea\u5206\u3067\u3082\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u53d6\u308a\u5165\u308c\u3066\u6d3b\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u9811\u5f35\u308a\u307e\u3057\u3087\u3046\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript\u521d\u5fc3\u8005\u304c\u8ab2\u984c\u306b\u611f\u3058\u308b\u306e\u306f\u3069\u3093\u306a\u3053\u3068\uff1f 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