{"id":1208,"date":"2022-03-06T23:36:20","date_gmt":"2022-03-06T14:36:20","guid":{"rendered":"https:\/\/engineering.webstudio168.jp\/?p=1208"},"modified":"2022-03-26T03:01:31","modified_gmt":"2022-03-25T18:01:31","slug":"javascript-closure","status":"publish","type":"post","link":"https:\/\/engineering.webstudio168.jp\/blog\/javascript-closure\/","title":{"rendered":"\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u3092JavaScript\u3067\u7406\u89e3\u3059\u308b\u30fb\u4f7f\u3044\u65b9"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u76ee\u6b21<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-closure\/#%E3%82%AF%E3%83%AD%E3%83%BC%E3%82%B8%E3%83%A3%E3%83%BC%E3%81%AE%E6%9C%80%E3%82%82%E7%B0%A1%E5%8D%98%E3%81%AA%E3%82%B5%E3%83%B3%E3%83%97%E3%83%AB%E3%82%B3%E3%83%BC%E3%83%89\" >\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u306e\u6700\u3082\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-closure\/#%E3%82%AF%E3%83%AD%E3%83%BC%E3%82%B8%E3%83%A3%E3%83%BC%E3%81%A8%E5%88%87%E3%81%A3%E3%81%A6%E3%82%82%E5%88%87%E3%82%8C%E3%81%AA%E3%81%84%E3%83%AC%E3%82%AD%E3%82%B7%E3%82%AB%E3%83%AB%E3%82%B9%E3%82%B3%E3%83%BC%E3%83%97\" >\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u3068\u5207\u3063\u3066\u3082\u5207\u308c\u306a\u3044\u30ec\u30ad\u30b7\u30ab\u30eb\u30b9\u30b3\u30fc\u30d7<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-closure\/#%E3%83%97%E3%83%A9%E3%82%A4%E3%83%99%E3%83%BC%E3%83%88%E3%83%A1%E3%82%BD%E3%83%83%E3%83%89%E7%9A%84%E3%81%AA%E4%BD%BF%E3%81%84%E6%96%B9\" >\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30e1\u30bd\u30c3\u30c9\u7684\u306a\u4f7f\u3044\u65b9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-closure\/#%E3%82%AF%E3%83%AD%E3%83%BC%E3%82%B8%E3%83%A3%E3%81%AE%E5%A4%9A%E7%94%A8%E3%81%AF%E3%83%91%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9E%E3%83%B3%E3%82%B9%E4%BD%8E%E4%B8%8B%E3%82%92%E6%8B%9B%E3%81%8F\" >\u30af\u30ed\u30fc\u30b8\u30e3\u306e\u591a\u7528\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u4f4e\u4e0b\u3092\u62db\u304f<\/a><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\">\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u3068\u306f\u3001\u5225\u540d\u300c\u95a2\u6570\u9589\u5305\u300d\u3068\u547c\u3070\u308c\u3001\u5185\u90e8\u30b9\u30b3\u30fc\u30d7\u304b\u3089\u5916\u90e8\u30b9\u30b3\u30fc\u30d7\u306e\u5909\u6570\u3092\u53c2\u7167\u3059\u308b\u95a2\u6570\u3067\u3059\u3002\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u306f\u3001\u5916\u5074\u306e\u30b9\u30b3\u30fc\u30d7\u3092\u305d\u306e\u5185\u5074\u306e\u30b9\u30b3\u30fc\u30d7\u5185\u306b\u4fdd\u6301\u3057\u307e\u3059\u3002\u57fa\u672c\u7684\u306b\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u306fFunction\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-cocoon-blocks-balloon-ex-box-1 speech-wrap sb-id-4 sbs-flat sbp-l sbis-cb cf block-box\"><div class=\"speech-person\"><figure class=\"speech-icon\"><img decoding=\"async\" src=\"https:\/\/engineering.webstudio168.jp\/blog\/wp-content\/uploads\/2022\/03\/face01.jpg\" alt=\"\u60a9\u898b\u5742 \u6953\" class=\"speech-icon-image\"\/><\/figure><div class=\"speech-name\">\u60a9\u898b\u5742 \u6953<\/div><\/div><div class=\"speech-balloon\">\n<p class=\"wp-block-paragraph\">\u304f\u308d\u30fc\u3058\u3083\u30fc\u3063\u3066\u30c7\u30b6\u30a4\u30ca\u30fc\u306b\u306f\u7121\u7e01\u3060\u3057<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-cocoon-blocks-balloon-ex-box-1 speech-wrap sb-id-1 sbs-flat sbp-r sbis-cb cf block-box\"><div class=\"speech-person\"><figure class=\"speech-icon\"><img decoding=\"async\" src=\"https:\/\/engineering.webstudio168.jp\/blog\/wp-content\/uploads\/2022\/03\/face03.jpg\" alt=\"\u8457\u8005\" class=\"speech-icon-image\"\/><\/figure><div class=\"speech-name\">\u8457\u8005<\/div><\/div><div class=\"speech-balloon\">\n<p class=\"wp-block-paragraph\">\u30c7\u30b6\u30a4\u30ca\u30fc\u306b\u5411\u3051\u3066\u66f8\u3044\u3066\u306a\u3044\u304b\u3089\u306d<\/p>\n<\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff08Object\u578b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3059\u304c\u2026\u2026\uff09\u306b\u3064\u3044\u3066\u306f\u5225\u9014\u307e\u3068\u3081\u3066\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u8208\u5473\u3042\u308b\u65b9\u306f\u4f75\u305b\u3066\u3054\u53c2\u7167\u304f\u3060\u3055\u3044\u3002\u5148\u306b\u8aad\u307e\u308c\u305f\u65b9\u304c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u64cd\u4f5c\u3078\u306e\u7406\u89e3\u304c\u6df1\u307e\u308a\u307e\u3059\u304c\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u3064\u3044\u3066\u306f\u5927\u4e08\u592b\u306a\u65b9\u306f\u305d\u306e\u307e\u307e\u7d9a\u3051\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-qootechweb wp-block-embed-qootechweb\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"DC6lxTYEyL\"><a href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-object\/\">JavaScript\u306b\u304a\u3051\u308bObject\uff08\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09\u578b<\/a><\/blockquote><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"\u201cJavaScript\u306b\u304a\u3051\u308bObject\uff08\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09\u578b\u201d \u2014 QooTechWEB-\u958b\u767a\u30ed\u30b0\u30fb\u5b9f\u52d9\u8a18\u9332\u30d6\u30ed\u30b0\" src=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-object\/embed\/#?secret=h5UqMlYxMH#?secret=DC6lxTYEyL\" data-secret=\"DC6lxTYEyL\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u300c\u5916\u5074\u300d\u300c\u5185\u5074\u300d\u3068\u8aac\u660e\u3057\u3066\u3082\u30a4\u30e1\u30fc\u30b8\u304c\u6cb8\u304b\u306a\u3044\u3068\u601d\u3044\u307e\u3059\u306e\u3067\u3001\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u8aad\u307f\u89e3\u304f\u306e\u304c\u7406\u89e3\u3078\u306e\u4e00\u756a\u306e\u8fd1\u9053\u3067\u3059\u3002\u5916\u5074\u306e\u95a2\u6570\u306e\u3053\u3068\u3092\u300c\u30a8\u30f3\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u300d\u3068\u8a00\u3063\u305f\u308a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u3092\u4f7f\u3046\u30e1\u30ea\u30c3\u30c8\u3068\u3057\u3066\u306f\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u5909\u6570\u3092\u5c11\u306a\u304f\u3057\u305f\u308a\u3001\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u306e\u53ef\u8aad\u6027\u3092\u9ad8\u3081\u3001\u7c21\u7d20\u5316\u3059\u308b\u3053\u3068\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u3068\u306f\u4f55\u304b\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u63b2\u8f09\u3057\u3064\u3064\u3001\u8aac\u660e\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%82%AF%E3%83%AD%E3%83%BC%E3%82%B8%E3%83%A3%E3%83%BC%E3%81%AE%E6%9C%80%E3%82%82%E7%B0%A1%E5%8D%98%E3%81%AA%E3%82%B5%E3%83%B3%E3%83%97%E3%83%AB%E3%82%B3%E3%83%BC%E3%83%89\"><\/span>\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u306e\u6700\u3082\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f55\u4e8b\u3082\u6700\u5c0f\u5358\u4f4d\u3067\u7269\u4e8b\u3092\u6349\u3048\u308b\u3068\u7406\u89e3\u304c\u65e9\u304f\u306a\u308a\u307e\u3059\u306d\u3002\u4ee5\u4e0b\u306b\u6700\u5c0f\u306e\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u3092\u63b2\u8f09\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-js\" data-file=\"sample.js\" data-lang=\"JavaScript\"><code>function enClosure() {\n  let localVariable = &#39;Hades&#39;; \/\/ \u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3092\u5ba3\u8a00\n  function closureSample() { \/\/ \u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u5185\u306e\u95a2\u6570\n    console.log(&#39;localVariable : &#39; + localVariable);\n  }\n  return closureSample; \/\/ \u95a2\u6570\u3092\u8fd4\u3059\n}<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u756a\u5916\u5074\u3092\u56f2\u3063\u3066\u3044\u308b<code>enClosure()<\/code>\u30e1\u30bd\u30c3\u30c9\u304c\u30a8\u30f3\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u306b\u306a\u308a\u307e\u3059\u3002\u5148\u307b\u3069\u8a00\u3063\u3066\u3044\u305f\u300c\u5916\u5074\u300d\u306e\u95a2\u6570\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e<code>enClosure()<\/code>\u30e1\u30bd\u30c3\u30c9\u5185\u306b\u3042\u308b<code>closureSample()<\/code>\u30e1\u30bd\u30c3\u30c9\u304c\u300c\u5185\u5074\u300d\u306e\u95a2\u6570\u3067\u3059\u306d\u3002\u3053\u306e\u4f8b\u3067\u306f<code>closuseSample()<\/code>\u3067\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306e<code>localVariable<\/code>\u3092\u30b3\u30f3\u30bd\u30fc\u30eb\u51fa\u529b\u3057\u3066\u3044\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u809d\u5fc3\u306a\u306e\u306f\u5916\u5074\u306e<code>enClosure()<\/code>\u304creturn\u3067closureSample\u30e1\u30bd\u30c3\u30c9\u3092\u8fd4\u3057\u3066\u3044\u308b\u70b9\u3067\u3059\u3002return\u306f\u5909\u6570\u3060\u3051\u3067\u306a\u304f\u3001\u95a2\u6570\uff08Function\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09\u3082\u8fd4\u3059\u3053\u3068\u304c\u51fa\u6765\u308b\u3093\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3082\u3061\u308d\u3093\u3001\u3053\u306e\u72b6\u614b\u3067\u306f\u30b3\u30f3\u30bd\u30fc\u30eb\u306b\u4f55\u3082\u51fa\u529b\u3055\u308c\u307e\u305b\u3093\u306e\u3067\u3001\u4e0b\u8a18\u306e\u3088\u3046\u306b<code>enClosure()<\/code>\u3092\u547c\u3073\u51fa\u3057\u3066\u5b9f\u884c\u3057\u3066\u3042\u3052\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-js\" data-file=\"sample.js\" data-lang=\"JavaScript\"><code>let enc01 = enClosure(); \/\/ \u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u306e\u521d\u671f\u5316\nenc01(); \/\/ \u521d\u671f\u5316\u3057\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u5185\u306e\u95a2\u6570\u3092\u5b9f\u884c<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3042\u308c\u3001<code>enCosure()<\/code>\u3060\u3051\u3058\u3083\u5b9f\u884c\u3055\u308c\u306a\u3044\u306e\uff1f\u3068\u601d\u3046\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u5b9f\u884c\u3055\u308c\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">retrun\u3057\u3066\u3044\u308b\u306e\u304cfunction\u540d\uff08Function\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09\u306a\u306e\u3067\u3001\u4e0a\u306e\u4f8b\u3067\u306fenc01\u306b\u4ee3\u5165\u3055\u308c\u3066\u3044\u308b\u306e\u306f<code>enClosure()<\/code>\u5185\u306eclosureSample\u3068\u3044\u3046\u5358\u306a\u308bFunction\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306a\u306e\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Function\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u305d\u308c\u5358\u4f53\u3067\u306f\u52d5\u4f5c\u3057\u307e\u305b\u3093\u306e\u3067\u3001\u300c()\u300d\u3092\u4ed8\u3051\u3066\u5b9f\u884c\u3055\u305b\u3066\u3044\u308b\u3093\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3061\u306a\u307f\u306b\u306a\u3093\u3067\u3059\u304c\u3001\u3053\u306e\u300c()\u300d\u3092enc01\u306b\u4ed8\u3051\u306a\u304f\u3066\u3082\u52d5\u4f5c\u3055\u305b\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002\u5148\u307b\u3069\u306e\u30b3\u30fc\u30c9\u3092\u5c11\u3057\u5909\u3048\u3066\u307f\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-js\" data-file=\"sample.js\" data-lang=\"JavaScript\"><code>function enClosure() {\n  let localVariable = &#39;Hades&#39;;\n  function closureSample() {\n    console.log(&#39;localVariable : &#39; + localVariable);\n  }\n  return closureSample(); \/\/ \u5b9f\u884c\u6e08\u307f\u306e\u95a2\u6570\u3092\u8fd4\u3059\n}<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">return\u306e\u90e8\u5206\u306b\u6ce8\u76ee\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u5148\u307b\u3069\u306f<code>return closureSample;<\/code>\u3068\u3057\u3066\u3044\u307e\u3057\u305f\u304c\u3001\u4eca\u56de\u306f<code>return closureSample();<\/code>\u3068\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3067\u3042\u308c\u3070\u3001<code>enc01();<\/code>\u306f\u4e0d\u8981\u3067\u3001<code>let enc01 = enClosure();<\/code>\u3092\u8a18\u8ff0\u3057\u305f\u6642\u70b9\u3067\u5373\u6642\u5b9f\u884c\u3055\u308c\u3001\u30b3\u30f3\u30bd\u30fc\u30eb\u51fa\u529b\u306b\u300clocalVariable : Hades\u300d\u3068\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3060\u3060\u3057\u3001\u3053\u306e\u5834\u5408\u3067\u306f\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u3092\u5b9f\u884c\u3059\u308b\u30bf\u30a4\u30df\u30f3\u30b0\u304c\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5ba3\u8a00\u3057\u305f\u6642\u306b\u9650\u3089\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u5b9f\u7528\u7684\u306a\u306e\u306f\u3001\uff08\u9762\u5012\u3067\u306f\u3042\u308a\u307e\u3059\u304c\uff092\u884c\u3067<code>enc01();<\/code>\u3092\u4f7f\u3046\u30d1\u30bf\u30fc\u30f3\u306b\u7d71\u4e00\u3057\u307e\u3057\u3087\u3046\u3002\u5168\u4f53\u306e\u30a4\u30e1\u30fc\u30b8\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-js\" data-file=\"sample.js\" data-lang=\"JavaScript\"><code>function enClosure() {\n  let localVariable = &#39;Hades&#39;;\n  function closureSample() {\n    console.log(&#39;localVariable : &#39; + localVariable);\n  }\n  return closureSample;\n}\n\nlet enc01 = enClosure();\nenc01();<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u7279\u306b\u96e3\u3057\u3044\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u306d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\uff08\u53c2\u8003\uff1a<a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Closures\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Closures<\/a>\uff09<\/p>\n\n\n\n<div class=\"wp-block-cocoon-blocks-balloon-ex-box-1 speech-wrap sb-id-4 sbs-flat sbp-l sbis-cb cf block-box\"><div class=\"speech-person\"><figure class=\"speech-icon\"><img decoding=\"async\" src=\"https:\/\/engineering.webstudio168.jp\/blog\/wp-content\/uploads\/2022\/03\/face01.jpg\" alt=\"\u60a9\u898b\u5742 \u6953\" class=\"speech-icon-image\"\/><\/figure><div class=\"speech-name\">\u60a9\u898b\u5742 \u6953<\/div><\/div><div class=\"speech-balloon\">\n<p class=\"wp-block-paragraph\">\u306a\u3093\u304b\u521d\u5fc3\u8005\u306e\u79c1\u3067\u3082\u66f8\u3051\u305d\u3046\u306a\u6c17\u304c\u3057\u3066\u304d\u305f<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-cocoon-blocks-balloon-ex-box-1 speech-wrap sb-id-1 sbs-flat sbp-r sbis-cb cf block-box\"><div class=\"speech-person\"><figure class=\"speech-icon\"><img decoding=\"async\" src=\"https:\/\/engineering.webstudio168.jp\/blog\/wp-content\/uploads\/2022\/03\/face03.jpg\" alt=\"\u8457\u8005\" class=\"speech-icon-image\"\/><\/figure><div class=\"speech-name\">\u8457\u8005<\/div><\/div><div class=\"speech-balloon\">\n<p class=\"wp-block-paragraph\">\u3068\u308a\u3042\u3048\u305a\u66f8\u304d\u307e\u304f\u308b\u306e\u304c\u6700\u521d\u306e\u4e00\u6b69\u3067\u3059\u306d<\/p>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%82%AF%E3%83%AD%E3%83%BC%E3%82%B8%E3%83%A3%E3%83%BC%E3%81%A8%E5%88%87%E3%81%A3%E3%81%A6%E3%82%82%E5%88%87%E3%82%8C%E3%81%AA%E3%81%84%E3%83%AC%E3%82%AD%E3%82%B7%E3%82%AB%E3%83%AB%E3%82%B9%E3%82%B3%E3%83%BC%E3%83%97\"><\/span>\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u3068\u5207\u3063\u3066\u3082\u5207\u308c\u306a\u3044\u30ec\u30ad\u30b7\u30ab\u30eb\u30b9\u30b3\u30fc\u30d7<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<div class=\"wp-block-cocoon-blocks-balloon-ex-box-1 speech-wrap sb-id-4 sbs-flat sbp-l sbis-cb cf block-box\"><div class=\"speech-person\"><figure class=\"speech-icon\"><img decoding=\"async\" src=\"https:\/\/engineering.webstudio168.jp\/blog\/wp-content\/uploads\/2022\/03\/face01.jpg\" alt=\"\u60a9\u898b\u5742 \u6953\" class=\"speech-icon-image\"\/><\/figure><div class=\"speech-name\">\u60a9\u898b\u5742 \u6953<\/div><\/div><div class=\"speech-balloon\">\n<p class=\"wp-block-paragraph\">\u307e\u305f\u8a33\u306e\u5206\u304b\u3089\u306a\u3044\u5358\u8a9e\u304c\u51fa\u3066\u304d\u305f\u2026\u2026<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-cocoon-blocks-balloon-ex-box-1 speech-wrap sb-id-1 sbs-flat sbp-r sbis-cb cf block-box\"><div class=\"speech-person\"><figure class=\"speech-icon\"><img decoding=\"async\" src=\"https:\/\/engineering.webstudio168.jp\/blog\/wp-content\/uploads\/2022\/03\/face03.jpg\" alt=\"\u8457\u8005\" class=\"speech-icon-image\"\/><\/figure><div class=\"speech-name\">\u8457\u8005<\/div><\/div><div class=\"speech-balloon\">\n<p class=\"wp-block-paragraph\">\u5206\u304b\u3089\u306a\u3044\u3053\u3068\u306f\u81ea\u5206\u306a\u308a\u306b\u3069\u3053\u304b\u306b\u307e\u3068\u3081\u3066\u304a\u304f\u3068\u5f8c\u3067\u898b\u8fd4\u3057\u3066\u899a\u3048\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3088<\/p>\n<\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ec\u30ad\u30b7\u30ab\u30eb\uff08Lexical\uff09\u30b9\u30b3\u30fc\u30d7\u306f\u3001\u9759\u7684\u30b9\u30b3\u30fc\u30d7\u3001\u5b57\u53e5\u30b9\u30b3\u30fc\u30d7\u3068\u3082\u547c\u3070\u308c\u3001\u89aa\u95a2\u6570\uff08\u30a8\u30f3\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\uff09\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u5909\u6570\u3092\u6307\u3057\u307e\u3059\u3002Lexical\u306f\u65e5\u672c\u8a9e\u3067\u300c\u5358\u8a9e\u306e\u300d\u3084\u300c\u8a9e\u5f59\u7684\u306a\u300d\u3068\u3044\u3046\u610f\u5473\u3067\u3059\u3002\u5b57\u53e5\u306e\u307f\u3067\u30b9\u30b3\u30fc\u30d7\u304c\u6c7a\u5b9a\u3055\u308c\u308b\u305f\u3081Lexical Scope\u3068\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ec\u30ad\u30b7\u30ab\u30eb\u30b9\u30b3\u30fc\u30d7\u306f\u30a8\u30f3\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u304c\u5b9a\u7fa9\u3055\u308c\u305f\u6642\u70b9\u3067\u6c7a\u5b9a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-js\" data-file=\"sample.js\" data-lang=\"JavaScript\"><code>function enClosure() {\n  let localVariable = &#39;Hades&#39;;\n  function closureSample() {\n    console.log(&#39;localVariable : &#39; + localVariable);\n  }\n  return closureSample;\n}\n\nlet enc01 = enClosure();\nenc01();<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u307b\u3069\u306e\u4f8b\u3067\u3059\u3068<code>localVariable<\/code>\u306f<code>closureSample()<\/code>\u306e\u30b9\u30b3\u30fc\u30d7\u5185\u306b\u3042\u308a\u307e\u3059\u3002\u30b9\u30b3\u30fc\u30d7\u3068\u3044\u3046\u306e\u306f\u5909\u6570\u304c\u6271\u3048\u308b\u30b3\u30fc\u30c9\u5185\u306e\u6709\u52b9\u7bc4\u56f2\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">closureSample\u306b\u306f\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306f\u5b58\u5728\u3057\u307e\u305b\u3093\u304c\u3001loalVariable\u306b\u306f\u30a2\u30af\u30bb\u30b9\u304c\u53ef\u80fd\u3067\u3059\u3002enClosere\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u5185\u306b\u3042\u308b\u5909\u6570\u304c\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u304b\u3089\u53c2\u7167\u3067\u304d\u308b\u3068\u3044\u3046\u3053\u3068\u3092\u62bc\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%83%97%E3%83%A9%E3%82%A4%E3%83%99%E3%83%BC%E3%83%88%E3%83%A1%E3%82%BD%E3%83%83%E3%83%89%E7%9A%84%E3%81%AA%E4%BD%BF%E3%81%84%E6%96%B9\"><\/span>\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30e1\u30bd\u30c3\u30c9\u7684\u306a\u4f7f\u3044\u65b9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f8b\u3048\u3070Java\u306b\u306f\u540c\u3058\u30af\u30e9\u30b9\u5185\u304b\u3089\u306e\u307f\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002\u30ab\u30d7\u30bb\u30eb\u5316\u3068\u3088\u304f\u8a00\u3044\u307e\u3059\u304c\u3001JavaScript\u3067\u3082\u540c\u69d8\u306e\u5b9f\u88c5\u304c\u53ef\u80fd\u3067\u3059\u3002<br>\uff08\u53c2\u8003\uff1a<a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Closures\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Closures<\/a>\uff09<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-js\" data-file=\"sample.js\" data-lang=\"JavaScript\"><code>let sumupSample = (function() {\n  let countNumber = 0;\n  function changeBy(val) {\n    countNumber += val;\n  }\n  return { \/\/ return\u306f\u914d\u5217\u5f62\u5f0f\u3067\u3082\u66f8\u3051\u308b\u3053\u3068\u304c\u91cd\u8981\n    incCountNumber: function() {\n      changeBy(1);\n    },\n    decCountNumber function() {\n      changeBy(-1);\n    },\n    getCountNumber: function() {\n      return countNumber; \/\/ return\u306e\u4e2d\u306breturn\u3082\u5165\u308c\u308c\u307e\u3059\n    }\n  };\n})();\n\nconsole.log(sumupSample.getCountNumber());<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><code>.getCountNumber()<\/code>\u306e\u90e8\u5206\u304c\u5206\u304b\u3089\u306a\u3044\u5834\u5408\u306f\u3001<a href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-object\/\">JavaScript\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u578b\u306e\u8a18\u4e8b<\/a>\u3092\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u306e\u4f8b\u3067\u3042\u308c\u3070\u3001\u7279\u306b\u52a0\u7b97\u3082\u6e1b\u7b97\u3082\u3055\u308c\u306a\u3044\u72b6\u614b\u3092\u8fd4\u3057\u3066\u3044\u308b\u306e\u3067\u300c0\u300d\u3068\u51fa\u529b\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u52a0\u7b97\u306e\u30e1\u30bd\u30c3\u30c9<code>incCountNumber<\/code>\u3092\u5229\u7528\u3059\u308b\u5834\u5408\u306f\u3001<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-js\" data-file=\"sample.js\" data-lang=\"JavaScript\"><code>sumupSample.incCountNumber();<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u6e1b\u7b97\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u5834\u5408\u306f\u3001<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-js\" data-file=\"sample.js\" data-lang=\"JavaScript\"><code>sumupSample.decCountNumber();<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u306e\u3088\u3046\u306b\u547c\u3073\u51fa\u3057\u307e\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u7406\u89e3\u3057\u3066\u3044\u308c\u3070\u96e3\u3057\u3044\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%82%AF%E3%83%AD%E3%83%BC%E3%82%B8%E3%83%A3%E3%81%AE%E5%A4%9A%E7%94%A8%E3%81%AF%E3%83%91%E3%83%95%E3%82%A9%E3%83%BC%E3%83%9E%E3%83%B3%E3%82%B9%E4%BD%8E%E4%B8%8B%E3%82%92%E6%8B%9B%E3%81%8F\"><\/span>\u30af\u30ed\u30fc\u30b8\u30e3\u306e\u591a\u7528\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u4f4e\u4e0b\u3092\u62db\u304f<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">function\u306bfunction\u3092\u3080\u3084\u307f\u306b\u5165\u308c\u308b\uff08\u30cd\u30b9\u30c8\u3059\u308b\uff09\u3068\u30af\u30e9\u30a4\u30a2\u30f3\u30c8PC\u306b\u7121\u99c4\u306b\u8ca0\u8377\u3092\u304b\u3051\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u306e\u771f\u4fa1\u304c\u554f\u308f\u308c\u306a\u3044\u3088\u3046\u306a\uff08\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3092\u8fd4\u3059\u3060\u3051\u3068\u304b\uff09\u5834\u5408\u306b\u306f\u3001prototype\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-js\" data-file=\"sample.js\" data-lang=\"JavaScript\"><code>function MyObject(name, age) {\n  this.name = name.toString();\n  this.age = age.parseInt();\n}\nMyObject.prototype.getName = function() {\n  return this.name;\n};\nMyObject.prototype.getMessage = function() {\n  return this.age;\n};<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">prototype\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u7d99\u627f\u30fb\u62e1\u5f35\u3059\u308bJavaScript\u306e\u4ed5\u7d44\u307f\u3067\u3059\u3002\u8aac\u660e\u304c\u9577\u304f\u306a\u308b\u305f\u3081\u3001\u307e\u305f\u5225\u7a3f\u3067\u7d39\u4ecb\u3059\u308b\u3053\u3068\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MyObject\u95a2\u6570\u306e\u4e2d\u306b\u306ffunction\u304c\u5165\u3063\u3066\u3044\u306a\u3044\u3053\u3068\u304c\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u66f8\u304d\u65b9\u306f\u5358\u7d14\u3067\u3001\u4e0a\u8a18\u306e\u4f8b\u3067\u306f<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-js\" data-file=\"sample.js\" data-lang=\"JavaScript\"><code>MyObject.prototype.getName = function() {\n  return this.name;\n};\nMyObject.prototype.getMessage = function() {\n  return this.age;\n};<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u306e\u3088\u3046\u306b\u66f8\u304d\u307e\u3059\u3002<code>this.name<\/code>\u3084<code>this.age<\/code>\u3092\u53c2\u7167\u3067\u304d\u308b\u306e\u306f\u3001MyObject\u3092\u7d99\u627f\u3057\u3066\u3044\u308b\u304b\u3089\u5909\u6570\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u3093\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306eprototype\u306f\u30e1\u30e2\u30ea\u306e\u7701\u30a8\u30cd\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u306e\u3067\u3001\u7a4d\u6975\u7684\u306b\u5229\u7528\u3059\u308b\u3053\u3068\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u3068\u306f\u3001\u5225\u540d\u300c\u95a2\u6570\u9589\u5305\u300d\u3068\u547c\u3070\u308c\u3001\u5185\u90e8\u30b9\u30b3\u30fc\u30d7\u304b\u3089\u5916\u90e8\u30b9\u30b3\u30fc\u30d7\u306e\u5909\u6570\u3092\u53c2\u7167\u3059\u308b\u95a2\u6570\u3067\u3059\u3002\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u306f\u3001\u5916\u5074\u306e\u30b9\u30b3\u30fc\u30d7\u3092\u305d\u306e\u5185\u5074\u306e\u30b9\u30b3\u30fc\u30d7\u5185\u306b\u4fdd\u6301\u3057\u307e\u3059\u3002\u57fa\u672c\u7684\u306b\u30af\u30ed\u30fc\u30b8\u30e3\u30fc\u306fFunction\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306a\u308a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1241,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[55],"tags":[8,48],"class_list":["post-1208","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript","tag-javascript","tag-48"],"_links":{"self":[{"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/posts\/1208","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/comments?post=1208"}],"version-history":[{"count":73,"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/posts\/1208\/revisions"}],"predecessor-version":[{"id":1617,"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/posts\/1208\/revisions\/1617"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/media\/1241"}],"wp:attachment":[{"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/media?parent=1208"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/categories?post=1208"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/tags?post=1208"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}