{"id":7914,"date":"2026-10-10T00:28:33","date_gmt":"2026-10-09T15:28:33","guid":{"rendered":"https:\/\/engineering.webstudio168.jp\/blog\/?p=7914"},"modified":"2026-10-10T00:28:35","modified_gmt":"2026-10-09T15:28:35","slug":"javascript-iife","status":"publish","type":"post","link":"https:\/\/engineering.webstudio168.jp\/blog\/javascript-iife\/","title":{"rendered":"\u3010JS\u3011IIFE\uff08\u5373\u6642\u5b9f\u884c\u95a2\u6570\u5f0f\uff09\u3068\u306f\uff1f\u66f8\u304d\u65b9\u30fb\u4f7f\u3044\u3069\u3053\u308d\u30fb\u4eca\u3067\u3082\u51fa\u756a\u304c\u3042\u308b\u5834\u9762\u307e\u3067\u89e3\u8aac"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_88 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-iife\/#IIFE%EF%BC%88%E5%8D%B3%E6%99%82%E5%AE%9F%E8%A1%8C%E9%96%A2%E6%95%B0%E5%BC%8F%EF%BC%89%E3%81%A8%E3%81%AF\" >IIFE\uff08\u5373\u6642\u5b9f\u884c\u95a2\u6570\u5f0f\uff09\u3068\u306f<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-iife\/#%E5%9F%BA%E6%9C%AC%E3%81%AE%E6%9B%B8%E3%81%8D%E6%96%B9\" >\u57fa\u672c\u306e\u66f8\u304d\u65b9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-iife\/#%E3%81%AA%E3%81%9C%E3%82%AB%E3%83%83%E3%82%B3%E3%81%A7%E5%9B%B2%E3%82%80%E5%BF%85%E8%A6%81%E3%81%8C%E3%81%82%E3%82%8B%E3%81%AE%E3%81%8B\" >\u306a\u305c\u30ab\u30c3\u30b3\u3067\u56f2\u3080\u5fc5\u8981\u304c\u3042\u308b\u306e\u304b<\/a><\/li><\/ul><\/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-iife\/#IIFE%E3%82%92%E4%BD%BF%E3%81%86%E7%90%86%E7%94%B1%E3%83%BB%E3%83%A1%E3%83%AA%E3%83%83%E3%83%88\" >IIFE\u3092\u4f7f\u3046\u7406\u7531\u30fb\u30e1\u30ea\u30c3\u30c8<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-iife\/#%E3%82%B0%E3%83%AD%E3%83%BC%E3%83%90%E3%83%AB%E6%B1%9A%E6%9F%93%E3%82%92%E9%98%B2%E3%81%90\" >\u30b0\u30ed\u30fc\u30d0\u30eb\u6c5a\u67d3\u3092\u9632\u3050<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-iife\/#%E3%82%AF%E3%83%AD%E3%83%BC%E3%82%B8%E3%83%A3%E3%81%A7%E3%83%97%E3%83%A9%E3%82%A4%E3%83%99%E3%83%BC%E3%83%88%E5%A4%89%E6%95%B0%E3%82%92%E4%BD%9C%E3%82%8B\" >\u30af\u30ed\u30fc\u30b8\u30e3\u3067\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u5909\u6570\u3092\u4f5c\u308b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-iife\/#%E5%BC%95%E6%95%B0%E3%81%A7%E3%82%B0%E3%83%AD%E3%83%BC%E3%83%90%E3%83%AB%E3%82%AA%E3%83%96%E3%82%B8%E3%82%A7%E3%82%AF%E3%83%88%E3%82%92%E5%8F%97%E3%81%91%E5%8F%96%E3%82%8B\" >\u5f15\u6570\u3067\u30b0\u30ed\u30fc\u30d0\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d7\u3051\u53d6\u308b<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-iife\/#%E3%82%A2%E3%83%AD%E3%83%BC%E9%96%A2%E6%95%B0%E3%83%BBasync%E3%83%BB%E3%81%9D%E3%81%AE%E4%BB%96%E3%81%AE%E6%9B%B8%E3%81%8D%E6%96%B9\" >\u30a2\u30ed\u30fc\u95a2\u6570\u30fbasync\u30fb\u305d\u306e\u4ed6\u306e\u66f8\u304d\u65b9<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-iife\/#%E3%82%A2%E3%83%AD%E3%83%BC%E9%96%A2%E6%95%B0%E3%81%A7%E3%81%AEIIFE\" >\u30a2\u30ed\u30fc\u95a2\u6570\u3067\u306eIIFE<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-iife\/#async_IIFE\" >async IIFE<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-iife\/#_%E3%82%84_void_%E3%82%92%E4%BD%BF%E3%81%A3%E3%81%9F%E6%9B%B8%E3%81%8D%E6%96%B9\" >! \u3084 void \u3092\u4f7f\u3063\u305f\u66f8\u304d\u65b9<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-iife\/#IIFE%E3%81%A7%E3%83%8F%E3%83%9E%E3%82%8A%E3%82%84%E3%81%99%E3%81%84%E8%90%BD%E3%81%A8%E3%81%97%E7%A9%B4\" >IIFE\u3067\u30cf\u30de\u308a\u3084\u3059\u3044\u843d\u3068\u3057\u7a74<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-iife\/#%E7%9B%B4%E5%89%8D%E3%81%AE%E8%A1%8C%E3%81%AE%E3%82%BB%E3%83%9F%E3%82%B3%E3%83%AD%E3%83%B3%E6%8A%9C%E3%81%91\" >\u76f4\u524d\u306e\u884c\u306e\u30bb\u30df\u30b3\u30ed\u30f3\u629c\u3051<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-iife\/#this%E3%81%A8strict%E3%83%A2%E3%83%BC%E3%83%89\" >this\u3068strict\u30e2\u30fc\u30c9<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-iife\/#%E4%BB%8A%E3%81%A7%E3%82%82IIFE%E3%81%AF%E5%BF%85%E8%A6%81%EF%BC%9F%E7%8F%BE%E4%BB%A3%E7%9A%84%E3%81%AA%E4%BB%A3%E6%9B%BF%E6%89%8B%E6%AE%B5\" >\u4eca\u3067\u3082IIFE\u306f\u5fc5\u8981\uff1f\u73fe\u4ee3\u7684\u306a\u4ee3\u66ff\u624b\u6bb5<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-iife\/#%E3%83%96%E3%83%AD%E3%83%83%E3%82%AF%E3%82%B9%E3%82%B3%E3%83%BC%E3%83%97%E3%81%A8ES_Modules%E3%81%A7%E4%BB%A3%E6%9B%BF%E3%81%A7%E3%81%8D%E3%82%8B\" >\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7\u3068ES Modules\u3067\u4ee3\u66ff\u3067\u304d\u308b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-iife\/#%E3%81%9D%E3%82%8C%E3%81%A7%E3%82%82IIFE%E3%81%8C%E6%B4%BB%E8%BA%8D%E3%81%99%E3%82%8B%E5%A0%B4%E9%9D%A2\" >\u305d\u308c\u3067\u3082IIFE\u304c\u6d3b\u8e8d\u3059\u308b\u5834\u9762<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript-iife\/#%E3%81%BE%E3%81%A8%E3%82%81\" >\u307e\u3068\u3081<\/a><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\">JavaScript\u306e\u30b3\u30fc\u30c9\u3092\u8aad\u3093\u3067\u3044\u308b\u3068\u3001\u305f\u307e\u306b\u51fa\u3066\u304f\u308b <code>(function(){ ... })();<\/code> \u3068\u3044\u3046\u8b0e\u306e\u30ab\u30c3\u30b3\u3060\u3089\u3051\u306e\u66f8\u304d\u65b9\u3002\u521d\u3081\u3066\u898b\u305f\u3068\u304d\u306f\u300c\u306a\u3093\u3067\u3053\u3093\u306a\u306b\u30ab\u30c3\u30b3\u3067\u56f2\u3080\u306e\uff1f\u300d\u3068\u9996\u3092\u304b\u3057\u3052\u305f\u65b9\u3082\u591a\u3044\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002\u3053\u308c\u304c\u4eca\u56de\u306e\u30c6\u30fc\u30de\u3067\u3042\u308bIIFE\uff08\u5373\u6642\u5b9f\u884c\u95a2\u6570\u5f0f\uff09\u3067\u3059\u3002\u4eca\u56de\u306fIIFE\u306e\u57fa\u672c\u306e\u66f8\u304d\u65b9\u304b\u3089\u3001\u306a\u305c\u4f7f\u3046\u306e\u304b\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u3084async\u3067\u306e\u66f8\u304d\u65b9\u3001\u30cf\u30de\u308a\u3084\u3059\u3044\u843d\u3068\u3057\u7a74\u3001\u305d\u3057\u3066ES Modules\u304c\u5f53\u305f\u308a\u524d\u306b\u306a\u3063\u305f\u4eca\u3067\u3082\u51fa\u756a\u304c\u3042\u308b\u5834\u9762\u307e\u3067\u3001\u307e\u3068\u3081\u3066\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"IIFE%EF%BC%88%E5%8D%B3%E6%99%82%E5%AE%9F%E8%A1%8C%E9%96%A2%E6%95%B0%E5%BC%8F%EF%BC%89%E3%81%A8%E3%81%AF\"><\/span>IIFE\uff08\u5373\u6642\u5b9f\u884c\u95a2\u6570\u5f0f\uff09\u3068\u306f<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">IIFE\u306f\u300cImmediately Invoked Function Expression\u300d\u306e\u7565\u3067\u3001\u65e5\u672c\u8a9e\u3067\u306f\u300c\u5373\u6642\u5b9f\u884c\u95a2\u6570\u5f0f\u300d\u307e\u305f\u306f\u300c\u5373\u6642\u95a2\u6570\u300d\u3068\u547c\u3070\u308c\u307e\u3059\u3002\u8aad\u307f\u65b9\u306f\u300c\u30a4\u30c3\u30d5\u30a3\u30fc\u300d\u304c\u4e00\u822c\u7684\u3067\u3059\u3002\u305d\u306e\u540d\u306e\u3068\u304a\u308a\u3001\u95a2\u6570\u3092\u5b9a\u7fa9\u3057\u305f\u305d\u306e\u5834\u3067\u3059\u3050\u306b\u5b9f\u884c\u3057\u3066\u3057\u307e\u3046\u66f8\u304d\u65b9\u306e\u3053\u3068\u3067\u3059\u306d\u3002\u300cIIFE\u300d\u3068\u3044\u3046\u547c\u79f0\u306f\u3001jQuery\u30d7\u30e9\u30b0\u30a4\u30f3\u306a\u3069\u3067\u6709\u540d\u306aBen Alman\u6c0f\u304c2010\u5e74\u306b\u81ea\u8eab\u306e\u30d6\u30ed\u30b0\u3067\u4f7f\u7528\u3092\u63d0\u6848\u3057\u305f\u3053\u3068\u3067\u5e83\u307e\u308a\u307e\u3057\u305f\u3002\u66f8\u304d\u65b9\u305d\u306e\u3082\u306e\u306f\u305d\u308c\u4ee5\u524d\u304b\u3089\u4f7f\u308f\u308c\u3066\u3044\u3066\u3001\u53e4\u3044\u8a18\u4e8b\u3067\u306f\u300c\u81ea\u5df1\u5b9f\u884c\u7121\u540d\u95a2\u6570\u300d\u306a\u3069\u306e\u547c\u3073\u65b9\u3082\u898b\u304b\u3051\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30dd\u30a4\u30f3\u30c8\u306f\u540d\u524d\u306b\u5165\u3063\u3066\u3044\u308b\u300c\u5f0f\uff08Expression\uff09\u300d\u3068\u3044\u3046\u90e8\u5206\u3067\u3059\u3002JavaScript\u306e\u95a2\u6570\u306b\u306f\u300c\u95a2\u6570\u5ba3\u8a00\u300d\u3068\u300c\u95a2\u6570\u5f0f\u300d\u306e2\u7a2e\u985e\u304c\u3042\u308a\u3001IIFE\u3068\u3057\u3066\u4f7f\u3046\u306e\u306f\u95a2\u6570\u5f0f\u306e\u307b\u3046\u3067\u3059\u3002\u95a2\u6570\u5f0f\u306f\u7121\u540d\u3067\u3082\u540d\u524d\u4ed8\u304d\u3067\u3082OK\u3067\u3059\u304c\u3001\u95a2\u6570\u5ba3\u8a00\u3068\u306f\u69cb\u6587\u4e0a\u306e\u6271\u3044\u304c\u9055\u3046\u305f\u3081\u3001\u95a2\u6570\u5f0f\u3068\u3057\u3066\u89e3\u91c8\u3055\u308c\u308b\u5f62\u306b\u3057\u3066\u304b\u3089\u547c\u3073\u51fa\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u9055\u3044\u3092\u62bc\u3055\u3048\u3066\u304a\u304f\u3068\u3001\u3042\u306e\u4e0d\u601d\u8b70\u306a\u30ab\u30c3\u30b3\u306e\u610f\u5473\u304c\u4e00\u6c17\u306b\u5206\u304b\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u9006\u306b\u3053\u3053\u3092\u66d6\u6627\u306b\u3057\u305f\u307e\u307e\u66f8\u304d\u65b9\u3060\u3051\u899a\u3048\u308b\u3068\u3001\u3061\u3087\u3063\u3068\u5f62\u3092\u5909\u3048\u305f\u3068\u304d\u306bSyntaxError\u304c\u51fa\u3066\u300c\u306a\u3093\u3067\uff1f\u300d\u3068\u306a\u308a\u304c\u3061\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%9F%BA%E6%9C%AC%E3%81%AE%E6%9B%B8%E3%81%8D%E6%96%B9\"><\/span>\u57fa\u672c\u306e\u66f8\u304d\u65b9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305a\u306f\u4e00\u756a\u30aa\u30fc\u30bd\u30c9\u30c3\u30af\u30b9\u306a\u66f8\u304d\u65b9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u7121\u540d\u95a2\u6570\u3092\u30ab\u30c3\u30b3\uff08\u30b0\u30eb\u30fc\u30d7\u5316\u6f14\u7b97\u5b50\uff09\u3067\u56f2\u307f\u3001\u305d\u306e\u76f4\u5f8c\u306b\u95a2\u6570\u547c\u3073\u51fa\u3057\u306e <code>()<\/code> \u3092\u4ed8\u3051\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>(function () {\n  console.log(&#39;IIFE \u304c\u5b9f\u884c\u3055\u308c\u307e\u3057\u305f&#39;);\n})();<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u524d\u534a\u306e <code>(function () { ... })<\/code> \u3067\u95a2\u6570\u5f0f\u3092\u4f5c\u308a\u3001\u5f8c\u534a\u306e <code>()<\/code> \u3067\u305d\u308c\u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u307e\u3059\u3002\u3064\u307e\u308a\u300c\u95a2\u6570\u3092\u4f5c\u308b\u300d\u3068\u300c\u95a2\u6570\u3092\u5b9f\u884c\u3059\u308b\u300d\u30921\u884c\uff081\u6587\uff09\u3067\u540c\u6642\u306b\u3084\u3063\u3066\u3044\u308b\u3001\u3068\u3044\u3046\u306e\u304cIIFE\u306e\u6b63\u4f53\u3067\u3059\u3002\u5206\u89e3\u3057\u3066\u307f\u308b\u3068\u610f\u5916\u3068\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u3088\u306d\u3002\u5358\u7d14\u306a\u4f8b\u306a\u3089\u3001\u540d\u524d\u3092\u4ed8\u3051\u305f\u95a2\u6570\u3092\u4f5c\u3063\u3066\u6b21\u306e\u884c\u3067\u547c\u3093\u3067\u3082\u7d50\u679c\u306f\u540c\u3058\u3067\u3059\u3002\u305f\u3060\u3057IIFE\u306e\u5834\u5408\u306f\u95a2\u6570\u540d\u304c\u5916\u306b\u516c\u958b\u3055\u308c\u305a\u3001\u3069\u3053\u304b\u3089\u3082\u53c2\u7167\u3055\u308c\u306a\u3044\u307e\u307e\u5b9f\u884c\u304c\u7d42\u308f\u308c\u3070\u7528\u6e08\u307f\u306b\u306a\u308b\u3001\u3068\u3044\u3046\u30b9\u30b3\u30fc\u30d7\u4e0a\u306e\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%81%AA%E3%81%9C%E3%82%AB%E3%83%83%E3%82%B3%E3%81%A7%E5%9B%B2%E3%82%80%E5%BF%85%E8%A6%81%E3%81%8C%E3%81%82%E3%82%8B%E3%81%AE%E3%81%8B\"><\/span>\u306a\u305c\u30ab\u30c3\u30b3\u3067\u56f2\u3080\u5fc5\u8981\u304c\u3042\u308b\u306e\u304b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ab\u30c3\u30b3\u3092\u5916\u3057\u3066 <code>function () { ... }();<\/code> \u3068\u66f8\u304f\u3068\u3001\u30d6\u30e9\u30a6\u30b6\u306f\u300cSyntaxError\u300d\u3092\u51fa\u3057\u3066\u6b62\u307e\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u884c\u982d\u306b <code>function<\/code> \u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u3042\u308b\u3068\u3001JavaScript\u30a8\u30f3\u30b8\u30f3\u306f\u305d\u308c\u3092\u300c\u95a2\u6570\u5ba3\u8a00\u300d\u3068\u3057\u3066\u89e3\u91c8\u3057\u3088\u3046\u3068\u3059\u308b\u304b\u3089\u3067\u3059\u3002\u95a2\u6570\u5ba3\u8a00\u306b\u306f\u540d\u524d\u304c\u5fc5\u9808\u3067\u3059\u3057\u3001\u5ba3\u8a00\u306e\u76f4\u5f8c\u306b <code>()<\/code> \u3092\u4ed8\u3051\u3066\u547c\u3073\u51fa\u3059\u3053\u3068\u3082\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u305d\u3053\u3067\u5916\u5074\u3092\u30ab\u30c3\u30b3\u3067\u56f2\u3080\u3053\u3068\u3067\u300c\u3053\u308c\u306f\u5ba3\u8a00\u3067\u306f\u306a\u304f\u5f0f\u3067\u3059\u3088\u300d\u3068\u30a8\u30f3\u30b8\u30f3\u306b\u4f1d\u3048\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u3002\u30ab\u30c3\u30b3\u306e\u4e2d\u306b\u306f\u5f0f\u3057\u304b\u66f8\u3051\u306a\u3044\u3068\u3044\u3046\u30eb\u30fc\u30eb\u3092\u5229\u7528\u3057\u305f\u3001\u3061\u3087\u3063\u3068\u3057\u305f\u30c6\u30af\u30cb\u30c3\u30af\u3067\u3059\u306d\u3002\u3061\u306a\u307f\u306b\u30ab\u30c3\u30b3\u306e\u4f4d\u7f6e\u306f <code>(function(){}())<\/code> \u306e\u3088\u3046\u306b\u547c\u3073\u51fa\u3057\u90e8\u5206\u307e\u3067\u542b\u3081\u3066\u56f2\u3093\u3067\u3082OK\u3067\u3001\u3069\u3061\u3089\u3092\u4f7f\u3046\u304b\u306f\u597d\u307f\u3084\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u898f\u7d04\u6b21\u7b2c\u3067\u3059\u3002\u30c1\u30fc\u30e0\u5185\u3067\u7d71\u4e00\u3055\u308c\u3066\u3044\u308c\u3070\u3001\u3069\u3061\u3089\u3067\u3082\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"IIFE%E3%82%92%E4%BD%BF%E3%81%86%E7%90%86%E7%94%B1%E3%83%BB%E3%83%A1%E3%83%AA%E3%83%83%E3%83%88\"><\/span>IIFE\u3092\u4f7f\u3046\u7406\u7531\u30fb\u30e1\u30ea\u30c3\u30c8<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u66f8\u304d\u65b9\u304c\u5206\u304b\u3063\u305f\u3068\u3053\u308d\u3067\u3001\u300c\u308f\u3056\u308f\u3056\u305d\u3093\u306a\u66f8\u304d\u65b9\u3092\u3059\u308b\u7406\u7531\u306f\uff1f\u300d\u3068\u3044\u3046\u672c\u984c\u306b\u5165\u308a\u307e\u3057\u3087\u3046\u3002IIFE\u304c\u591a\u7528\u3055\u308c\u3066\u3044\u305f\u80cc\u666f\u306b\u306f\u3001\u304b\u3064\u3066\u306eJavaScript\u306b\u300c\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7\u300d\u3082\u300c\u30e2\u30b8\u30e5\u30fc\u30eb\u300d\u3082\u7121\u304b\u3063\u305f\u3068\u3044\u3046\u4e8b\u60c5\u304c\u3042\u308a\u307e\u3059\u3002<code>var<\/code> \u3067\u5ba3\u8a00\u3057\u305f\u5909\u6570\u306f\u95a2\u6570\u5358\u4f4d\u3067\u3057\u304b\u30b9\u30b3\u30fc\u30d7\u3092\u533a\u5207\u308c\u305a\u3001\u901a\u5e38\u306escript\u30bf\u30b0\u3067\u8aad\u307f\u8fbc\u3093\u3060\u30d5\u30a1\u30a4\u30eb\u306e\u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\u306b <code>var<\/code> \u3084\u95a2\u6570\u5ba3\u8a00\u3092\u66f8\u304f\u3068\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u30b9\u30b3\u30fc\u30d7\u306b\u5f71\u97ff\u3057\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8907\u6570\u306escript\u30bf\u30b0\u3067\u8aad\u307f\u8fbc\u3093\u3060JS\u30d5\u30a1\u30a4\u30eb\u540c\u58eb\u306f\u540c\u3058\u30b0\u30ed\u30fc\u30d0\u30eb\u74b0\u5883\u3092\u5171\u6709\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u5225\u306e\u4eba\u304c\u66f8\u3044\u305f\u30d5\u30a1\u30a4\u30eb\u3068\u5909\u6570\u540d\u3084\u95a2\u6570\u540d\u304c\u304b\u3076\u308b\u3068\u3001\u77e5\u3089\u306a\u3044\u3046\u3061\u306b\u5024\u304c\u4e0a\u66f8\u304d\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u30c7\u30d0\u30c3\u30b0\u3059\u308b\u5074\u304b\u3089\u3059\u308b\u3068\u3001\u3053\u308c\u306f\u3082\u3046\u5730\u7344\u3067\u3059\u3002\u3053\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3059\u308b\u305f\u3081\u306b\u4f7f\u308f\u308c\u3066\u3044\u305f\u306e\u304c\u3001\u95a2\u6570\u30b9\u30b3\u30fc\u30d7\u3092\u5229\u7528\u3057\u3066\u5909\u6570\u3092\u9589\u3058\u8fbc\u3081\u308bIIFE\u3060\u3063\u305f\u308f\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%82%B0%E3%83%AD%E3%83%BC%E3%83%90%E3%83%AB%E6%B1%9A%E6%9F%93%E3%82%92%E9%98%B2%E3%81%90\"><\/span>\u30b0\u30ed\u30fc\u30d0\u30eb\u6c5a\u67d3\u3092\u9632\u3050<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">IIFE\u306e\u4e2d\u3067\u5ba3\u8a00\u3057\u305f\u5909\u6570\u306f\u3001\u305d\u306e\u95a2\u6570\u306e\u4e2d\u3060\u3051\u3067\u6709\u52b9\u306b\u306a\u308a\u307e\u3059\u3002\u521d\u671f\u5316\u51e6\u7406\u306e\u3088\u3046\u306b\u300c\u4e00\u5ea6\u5b9f\u884c\u3059\u308c\u3070\u7d42\u308f\u308a\u300d\u3068\u3044\u3046\u30b3\u30fc\u30c9\u3092IIFE\u3067\u56f2\u3093\u3067\u304a\u3051\u3070\u3001\u51e6\u7406\u7528\u306e\u5909\u6570\u304c\u30b0\u30ed\u30fc\u30d0\u30eb\u306b\u6b8b\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>(function () {\n  var count = 0;\n  var label = &#39;\u521d\u671f\u5316&#39;;\n  console.log(label, count);\n})();\n\nconsole.log(typeof count); \/\/ &quot;undefined&quot;<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u95a2\u6570\u306e\u5916\u304b\u3089 <code>count<\/code> \u3092\u53c2\u7167\u3057\u3066\u3082\u3001\u5b58\u5728\u3057\u306a\u3044\u6271\u3044\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u306d\u3002\u30e9\u30a4\u30d6\u30e9\u30ea\u3084\u30d7\u30e9\u30b0\u30a4\u30f3\u3092\u4f5c\u308b\u3068\u304d\u306b\u3001\u5229\u7528\u8005\u5074\u306e\u30b3\u30fc\u30c9\u3068\u540d\u524d\u304c\u885d\u7a81\u3057\u306a\u3044\u3088\u3046\u3001\u30d5\u30a1\u30a4\u30eb\u5168\u4f53\u3092IIFE\u3067\u5305\u3080\u306e\u306f\u6614\u306e\u5b9a\u756a\u30d1\u30bf\u30fc\u30f3\u3067\u3057\u305f\u3002\u5f93\u6765\u306ejQuery\u30d7\u30e9\u30b0\u30a4\u30f3\u306e\u30bd\u30fc\u30b9\u3067\u3082\u3001\u3088\u304f\u898b\u3089\u308c\u305f\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<\/p>\n\n\n\n<h3 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%A7%E3%83%97%E3%83%A9%E3%82%A4%E3%83%99%E3%83%BC%E3%83%88%E5%A4%89%E6%95%B0%E3%82%92%E4%BD%9C%E3%82%8B\"><\/span>\u30af\u30ed\u30fc\u30b8\u30e3\u3067\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u5909\u6570\u3092\u4f5c\u308b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">IIFE\u306f\u30af\u30ed\u30fc\u30b8\u30e3\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u5916\u90e8\u304b\u3089\u76f4\u63a5\u66f8\u304d\u63db\u3048\u3089\u308c\u306a\u3044\u300c\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306a\u5909\u6570\u300d\u3092\u4f5c\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002IIFE\u306e\u623b\u308a\u5024\u3068\u3057\u3066\u95a2\u6570\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3059\u3068\u3001\u8fd4\u3055\u308c\u305f\u5074\u306f\u5185\u90e8\u306e\u5909\u6570\u3092\u53c2\u7167\u3057\u7d9a\u3051\u3089\u308c\u308b\u4e00\u65b9\u3001\u5916\u304b\u3089\u306f\u89e6\u308c\u306a\u3044\u72b6\u614b\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const counter = (function () {\n  let count = 0;\n  return {\n    increment() { return ++count; },\n    reset() { count = 0; }\n  };\n})();\n\ncounter.increment(); \/\/ 1\ncounter.increment(); \/\/ 2\nconsole.log(counter.count); \/\/ undefined<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u306f\u3044\u308f\u3086\u308b\u300c\u30e2\u30b8\u30e5\u30fc\u30eb\u30d1\u30bf\u30fc\u30f3\u300d\u3068\u547c\u3070\u308c\u308b\u66f8\u304d\u65b9\u3067\u3001ES Modules\u304c\u767b\u5834\u3059\u308b\u524d\u306f\u3001\u3053\u306e\u4ed5\u7d44\u307f\u3067\u64ec\u4f3c\u7684\u306b\u30e2\u30b8\u30e5\u30fc\u30eb\u3092\u5b9f\u73fe\u3057\u3066\u3044\u307e\u3057\u305f\u3002<code>count<\/code> \u306f\u5916\u304b\u3089\u898b\u3048\u306a\u3044\u306e\u3067\u3001\u610f\u56f3\u3057\u306a\u3044\u5024\u306e\u66f8\u304d\u63db\u3048\u3092\u9632\u3052\u308b\u306e\u304c\u5229\u70b9\u3067\u3059\u3002\u516c\u958b\u3057\u305f\u3044\u3082\u306e\u3060\u3051\u3092 return \u3067\u8fd4\u3059\u3001\u3068\u3044\u3046\u767a\u60f3\u306f\u4eca\u306eexport\/import\u306b\u3082\u305d\u306e\u307e\u307e\u901a\u3058\u308b\u8003\u3048\u65b9\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%BC%95%E6%95%B0%E3%81%A7%E3%82%B0%E3%83%AD%E3%83%BC%E3%83%90%E3%83%AB%E3%82%AA%E3%83%96%E3%82%B8%E3%82%A7%E3%82%AF%E3%83%88%E3%82%92%E5%8F%97%E3%81%91%E5%8F%96%E3%82%8B\"><\/span>\u5f15\u6570\u3067\u30b0\u30ed\u30fc\u30d0\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u53d7\u3051\u53d6\u308b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">IIFE\u306f\u666e\u901a\u306e\u95a2\u6570\u306a\u306e\u3067\u3001\u3082\u3061\u308d\u3093\u5f15\u6570\u3092\u6e21\u3059\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u3088\u304f\u898b\u304b\u3051\u308b\u306e\u304c\u3001jQuery\u306e <code>$<\/code> \u3092\u5b89\u5168\u306b\u4f7f\u3046\u305f\u3081\u306e\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>(function ($) {\n  $(&#39;.btn&#39;).on(&#39;click&#39;, function () { \/* ... *\/ });\n})(jQuery);<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ed6\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u304c <code>$<\/code> \u3092\u5225\u306e\u610f\u5473\u3067\u4f7f\u3063\u3066\u3044\u3066\u3082\u3001IIFE\u306e\u5185\u5074\u3067\u306f <code>$<\/code> \u304c\u78ba\u5b9f\u306bjQuery\u3092\u6307\u3059\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002CMS\u306e\u3088\u3046\u306b\u3001\u3069\u3093\u306a\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u4e00\u7dd2\u306b\u8aad\u307f\u8fbc\u307e\u308c\u308b\u304b\u5206\u304b\u3089\u306a\u3044\u74b0\u5883\u3067\u306f\u3001\u5730\u5473\u306a\u304c\u3089\u304b\u306a\u308a\u983c\u308a\u306b\u306a\u308b\u66f8\u304d\u65b9\u3067\u3059\u3002\u540c\u3058\u7406\u7531\u3067 <code>window<\/code> \u3084 <code>document<\/code> \u3092\u5f15\u6570\u3067\u53d7\u3051\u53d6\u308a\u3001\u5727\u7e2e\u6642\u306b\u77ed\u3044\u5909\u6570\u540d\u3078\u7f6e\u304d\u63db\u3048\u3084\u3059\u304f\u3059\u308b\u3001\u3068\u3044\u3046\u30c6\u30af\u30cb\u30c3\u30af\u3082\u6614\u306f\u3088\u304f\u4f7f\u308f\u308c\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%82%A2%E3%83%AD%E3%83%BC%E9%96%A2%E6%95%B0%E3%83%BBasync%E3%83%BB%E3%81%9D%E3%81%AE%E4%BB%96%E3%81%AE%E6%9B%B8%E3%81%8D%E6%96%B9\"><\/span>\u30a2\u30ed\u30fc\u95a2\u6570\u30fbasync\u30fb\u305d\u306e\u4ed6\u306e\u66f8\u304d\u65b9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ES2015\uff08ES6\uff09\u4ee5\u964d\u306f\u30a2\u30ed\u30fc\u95a2\u6570\u3067\u3082IIFE\u3092\u66f8\u3051\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u307e\u305f\u3001async\u95a2\u6570\u3068\u7d44\u307f\u5408\u308f\u305b\u305f\u66f8\u304d\u65b9\u3082\u5b9f\u52d9\u3067\u306f\u3088\u304f\u4f7f\u3044\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u4ee3\u8868\u7684\u306a\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u3092\u307e\u3068\u3081\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%82%A2%E3%83%AD%E3%83%BC%E9%96%A2%E6%95%B0%E3%81%A7%E3%81%AEIIFE\"><\/span>\u30a2\u30ed\u30fc\u95a2\u6570\u3067\u306eIIFE<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>(() =&gt; {\n  console.log(&#39;\u30a2\u30ed\u30fc\u95a2\u6570\u306eIIFE&#39;);\n})();<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u610f\u3057\u305f\u3044\u306e\u306f\u30ab\u30c3\u30b3\u306e\u4f4d\u7f6e\u3067\u3059\u3002\u30a2\u30ed\u30fc\u95a2\u6570\u3067IIFE\u3092\u66f8\u304f\u5834\u5408\u306f\u3001\u95a2\u6570\u5168\u4f53\u3092\u30ab\u30c3\u30b3\u3067\u56f2\u3093\u3067\u304b\u3089\u3001\u305d\u306e\u5916\u5074\u306b\u547c\u3073\u51fa\u3057\u306e <code>()<\/code> \u3092\u4ed8\u3051\u307e\u3059\u3002\u901a\u5e38\u306e\u95a2\u6570\u5f0f\u3067\u4f7f\u3048\u308b <code>(function () {}())<\/code> \u3068\u540c\u3058\u5f62\u3092\u30a2\u30ed\u30fc\u95a2\u6570\u306b\u5f53\u3066\u306f\u3081\u3066 <code>(() =&gt; {}())<\/code> \u3068\u66f8\u304f\u3068\u3001SyntaxError\u306b\u306a\u308b\u306e\u3067\u8981\u6ce8\u610f\u3067\u3059\u3002\u307e\u305f\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u306f\u81ea\u5206\u81ea\u8eab\u306e <code>this<\/code> \u3092\u6301\u305f\u306a\u3044\u306e\u3067\u3001IIFE\u5185\u3067 <code>this<\/code> \u3092\u4f7f\u3046\u53e4\u3044\u30b3\u30fc\u30c9\u3092\u305d\u306e\u307e\u307e\u30a2\u30ed\u30fc\u95a2\u6570\u306b\u7f6e\u304d\u63db\u3048\u308b\u3068\u6319\u52d5\u304c\u5909\u308f\u308b\u70b9\u306b\u3082\u6c17\u3092\u4ed8\u3051\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"async_IIFE\"><\/span>async IIFE<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\u3067 <code>await<\/code> \u3092\u4f7f\u3044\u305f\u3044\u3051\u308c\u3069\u3001\u5b9f\u884c\u74b0\u5883\u306e\u90fd\u5408\u3067top-level await\u304c\u4f7f\u3048\u306a\u3044\u2026\u2026\u3068\u3044\u3046\u3068\u304d\u306b\u4fbf\u5229\u306a\u306e\u304casync IIFE\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>(async () =&gt; {\n  try {\n    const res = await fetch(&#39;\/api\/data.json&#39;);\n    if (!res.ok) {\n      throw new Error(`HTTP error: ${res.status}`);\n    }\n    const data = await res.json();\n    console.log(data);\n  } catch (error) {\n    console.error(&#39;\u30c7\u30fc\u30bf\u53d6\u5f97\u306b\u5931\u6557\u3057\u307e\u3057\u305f&#39;, error);\n  }\n})();<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">ES Modules\u3067\u3042\u308c\u3070top-level await\u304c\u4f7f\u3048\u307e\u3059\u304c\u3001\u901a\u5e38\u306escript\u30bf\u30b0\u3067\u8aad\u307f\u8fbc\u3080\u30d5\u30a1\u30a4\u30eb\u3084CommonJS\u5f62\u5f0f\u306eNode.js\u30b9\u30af\u30ea\u30d7\u30c8\u3067\u306f\u4f7f\u3048\u307e\u305b\u3093\u3002\u3061\u3087\u3063\u3068\u3057\u305f\u691c\u8a3c\u7528\u30b9\u30af\u30ea\u30d7\u30c8\u3084\u3001\u65e2\u5b58\u306e\u53e4\u3044\u69cb\u6210\u306e\u30b5\u30a4\u30c8\u306b\u975e\u540c\u671f\u51e6\u7406\u3092\u8ffd\u52a0\u3059\u308b\u3068\u304d\u306b\u91cd\u5b9d\u3057\u307e\u3059\u3002\u306a\u304a\u3001async IIFE\u306f\u5b9f\u884c\u7d50\u679c\u3068\u3057\u3066Promise\u3092\u8fd4\u3057\u307e\u3059\u3002\u95a2\u6570\u5185\u3067\u4f8b\u5916\u304c\u8d77\u304d\u308b\u3068\u305d\u306ePromise\u306freject\u72b6\u614b\u306b\u306a\u308a\u3001\u8ab0\u3082\u51e6\u7406\u3057\u306a\u3051\u308c\u3070\u672a\u51e6\u7406\u306e\u62d2\u5426\uff08Unhandled Rejection\uff09\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u4e0a\u306e\u4f8b\u306e\u3088\u3046\u306btry\/catch\u3067\u56f2\u3080\u304b\u3001\u547c\u3073\u51fa\u3057\u6642\u306b <code>.catch()<\/code> \u3092\u4ed8\u3051\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002\u307e\u305f\u3001<code>fetch()<\/code> \u306f404\u3084500\u304c\u8fd4\u3063\u3066\u304d\u305f\u3060\u3051\u3067\u306freject\u3055\u308c\u306a\u3044\u306e\u3067\u3001<code>res.ok<\/code> \u306e\u78ba\u8a8d\u3082\u5165\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"_%E3%82%84_void_%E3%82%92%E4%BD%BF%E3%81%A3%E3%81%9F%E6%9B%B8%E3%81%8D%E6%96%B9\"><\/span>! \u3084 void \u3092\u4f7f\u3063\u305f\u66f8\u304d\u65b9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ab\u30c3\u30b3\u4ee5\u5916\u306b\u3082\u3001\u5358\u9805\u6f14\u7b97\u5b50\u3092\u524d\u306b\u7f6e\u3044\u3066\u95a2\u6570\u3092\u300c\u5f0f\u300d\u3068\u3057\u3066\u6271\u308f\u305b\u308b\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>!function () { console.log(&#39;!\u3092\u4f7f\u3063\u305fIIFE&#39;); }();\nvoid function () { console.log(&#39;void\u3092\u4f7f\u3063\u305fIIFE&#39;); }();<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u5727\u7e2e\u3055\u308c\u305f\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u30b3\u30fc\u30c9\u3067 <code>!function(){...}()<\/code> \u3092\u898b\u304b\u3051\u305f\u3089\u3001\u305d\u308c\u306fIIFE\u3067\u3059\u3002\u5727\u7e2e\u30b3\u30fc\u30c9\u3067\u306f\u3001\u6587\u5b57\u6570\u3092\u5c11\u3057\u3067\u3082\u524a\u308b\u305f\u3081\u306b\u3053\u306e\u5f62\u304c\u4f7f\u308f\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u8aad\u307f\u3084\u3059\u3055\u3092\u8003\u3048\u308b\u3068\u3001\u81ea\u5206\u3067\u66f8\u304f\u30b3\u30fc\u30c9\u3067\u306f\u7d20\u76f4\u306b\u30ab\u30c3\u30b3\u3092\u4f7f\u3063\u305f\u307b\u3046\u304c\u3044\u3044\u3068\u601d\u3044\u307e\u3059\u3002\u203b\u500b\u4eba\u306e\u611f\u60f3\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"IIFE%E3%81%A7%E3%83%8F%E3%83%9E%E3%82%8A%E3%82%84%E3%81%99%E3%81%84%E8%90%BD%E3%81%A8%E3%81%97%E7%A9%B4\"><\/span>IIFE\u3067\u30cf\u30de\u308a\u3084\u3059\u3044\u843d\u3068\u3057\u7a74<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4fbf\u5229\u306aIIFE\u3067\u3059\u304c\u3001\u66f8\u304d\u65b9\u306b\u8d77\u56e0\u3059\u308b\u5178\u578b\u7684\u306a\u30a8\u30e9\u30fc\u304c\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u3002\u7279\u306b\u30bb\u30df\u30b3\u30ed\u30f3\u3092\u7701\u7565\u3059\u308b\u30b9\u30bf\u30a4\u30eb\u3067\u66f8\u3044\u3066\u3044\u308b\u65b9\u306f\u8981\u6ce8\u610f\u3067\u3059\u3002\u77e5\u3089\u306a\u3044\u3068\u539f\u56e0\u3092\u7a81\u304d\u6b62\u3081\u308b\u306e\u306b\u304b\u306a\u308a\u6642\u9593\u3092\u6eb6\u304b\u3059\u3053\u3068\u306b\u306a\u308b\u306e\u3067\u3001\u3053\u3053\u3067\u62bc\u3055\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%9B%B4%E5%89%8D%E3%81%AE%E8%A1%8C%E3%81%AE%E3%82%BB%E3%83%9F%E3%82%B3%E3%83%AD%E3%83%B3%E6%8A%9C%E3%81%91\"><\/span>\u76f4\u524d\u306e\u884c\u306e\u30bb\u30df\u30b3\u30ed\u30f3\u629c\u3051<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">JavaScript\u306b\u306f\u81ea\u52d5\u30bb\u30df\u30b3\u30ed\u30f3\u633f\u5165\uff08ASI\uff09\u3068\u3044\u3046\u4ed5\u7d44\u307f\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u884c\u982d\u304c <code>(<\/code> \u3067\u59cb\u307e\u308b\u5834\u5408\u306f\u524d\u306e\u884c\u3068\u3064\u306a\u304c\u3063\u3066\u89e3\u91c8\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>const message = &#39;hello&#39;\n(function () {\n  console.log(message);\n})();\n\/\/ TypeError: &quot;hello&quot; is not a function<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u306e\u30b3\u30fc\u30c9\u306f <code>'hello'(function(){...})<\/code> \u3068\u89e3\u91c8\u3055\u308c\u3001\u300c\u6587\u5b57\u5217\u3092\u95a2\u6570\u3068\u3057\u3066\u547c\u3073\u51fa\u305d\u3046\u3068\u3057\u305f\u300d\u3068\u3044\u3046\u30a8\u30e9\u30fc\u306b\u306a\u308a\u307e\u3059\u3002\u30d5\u30a1\u30a4\u30eb\u3092\u7d50\u5408\u3059\u308b\u30d3\u30eb\u30c9\u51e6\u7406\u3067\u3001\u524d\u306e\u30d5\u30a1\u30a4\u30eb\u306e\u672b\u5c3e\u306b\u30bb\u30df\u30b3\u30ed\u30f3\u304c\u306a\u304b\u3063\u305f\u5834\u5408\u306b\u3082\u540c\u3058\u3053\u3068\u304c\u8d77\u3053\u308a\u307e\u3059\u3002\u57fa\u672c\u7684\u306a\u5bfe\u7b56\u306f\u3001\u524d\u306e\u6587\u3092\u304d\u3061\u3093\u3068\u30bb\u30df\u30b3\u30ed\u30f3\u3067\u7d42\u3048\u308b\u3053\u3068\u3067\u3059\u3002\u305d\u306e\u3046\u3048\u3067\u3001IIFE\u306e\u5148\u982d\u306b <code>;(function(){...})()<\/code> \u3068\u30bb\u30df\u30b3\u30ed\u30f3\u3092\u4ed8\u3051\u3066\u304a\u304f\u66f8\u304d\u65b9\u304c\u6614\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u3088\u304f\u898b\u3089\u308c\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u524d\u306e\u30b3\u30fc\u30c9\u306e\u672b\u5c3e\u306b\u30bb\u30df\u30b3\u30ed\u30f3\u304c\u306a\u304b\u3063\u305f\u5834\u5408\u306b\u5099\u3048\u305f\u9632\u5fa1\u7b56\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"this%E3%81%A8strict%E3%83%A2%E3%83%BC%E3%83%89\"><\/span>this\u3068strict\u30e2\u30fc\u30c9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u5e38\u306e\u95a2\u6570\u3067\u66f8\u3044\u305fIIFE\u306e\u4e2d\u306e <code>this<\/code> \u306f\u3001\u975estrict\u30e2\u30fc\u30c9\u3067\u306f\u30b0\u30ed\u30fc\u30d0\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff08\u30d6\u30e9\u30a6\u30b6\u306a\u3089 <code>window<\/code>\uff09\u3001strict\u30e2\u30fc\u30c9\u3067\u306f <code>undefined<\/code> \u306b\u306a\u308a\u307e\u3059\u3002IIFE\u306e\u4e2d\u3067 <code>'use strict'<\/code> \u3092\u5ba3\u8a00\u3059\u308b\u3068\u6319\u52d5\u304c\u5909\u308f\u308b\u306e\u3067\u3001<code>this<\/code> \u306b\u4f9d\u5b58\u3057\u305f\u30b3\u30fc\u30c9\u306f\u907f\u3051\u308b\u306e\u304c\u7121\u96e3\u3067\u3059\u3002\u30b0\u30ed\u30fc\u30d0\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5fc5\u8981\u306a\u3089\u3001<code>globalThis<\/code> \u3092\u76f4\u63a5\u53c2\u7167\u3059\u308b\u307b\u3046\u304c\u610f\u56f3\u304c\u660e\u78ba\u306b\u306a\u308a\u307e\u3059\u3002\u3061\u306a\u307f\u306bES Modules\u306f\u81ea\u52d5\u7684\u306bstrict\u30e2\u30fc\u30c9\u3067\u5b9f\u884c\u3055\u308c\u308b\u306e\u3067\u3001\u30e2\u30b8\u30e5\u30fc\u30eb\u5185\u306b\u66f8\u3044\u305fIIFE\uff08\u901a\u5e38\u306e\u95a2\u6570\u5f0f\uff09\u306e <code>this<\/code> \u3082 <code>undefined<\/code> \u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BB%8A%E3%81%A7%E3%82%82IIFE%E3%81%AF%E5%BF%85%E8%A6%81%EF%BC%9F%E7%8F%BE%E4%BB%A3%E7%9A%84%E3%81%AA%E4%BB%A3%E6%9B%BF%E6%89%8B%E6%AE%B5\"><\/span>\u4eca\u3067\u3082IIFE\u306f\u5fc5\u8981\uff1f\u73fe\u4ee3\u7684\u306a\u4ee3\u66ff\u624b\u6bb5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u3053\u307e\u3067\u8aad\u3093\u3067\u300c\u3067\u3082\u4eca\u306f <code>let<\/code> \u3084 <code>const<\/code> \u3082\u3042\u308b\u3057\u3001ES Modules\u3082\u3042\u308b\u3057\u3001IIFE\u3063\u3066\u3082\u3046\u8981\u3089\u306a\u3044\u306e\u3067\u306f\uff1f\u300d\u3068\u601d\u3063\u305f\u65b9\u3082\u3044\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u7d50\u8ad6\u304b\u3089\u8a00\u3046\u3068\u3001\u65e5\u5e38\u7684\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u958b\u767a\u3067IIFE\u3092\u66f8\u304f\u6a5f\u4f1a\u306f\u304b\u306a\u308a\u6e1b\u308a\u307e\u3057\u305f\u3002\u305f\u3060\u3001\u5b8c\u5168\u306b\u904e\u53bb\u306e\u907a\u7269\u306b\u306a\u3063\u305f\u308f\u3051\u3067\u306f\u306a\u304f\u3001\u3061\u3083\u3093\u3068\u51fa\u756a\u304c\u6b8b\u3063\u3066\u3044\u308b\u5834\u9762\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%83%96%E3%83%AD%E3%83%83%E3%82%AF%E3%82%B9%E3%82%B3%E3%83%BC%E3%83%97%E3%81%A8ES_Modules%E3%81%A7%E4%BB%A3%E6%9B%BF%E3%81%A7%E3%81%8D%E3%82%8B\"><\/span>\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7\u3068ES Modules\u3067\u4ee3\u66ff\u3067\u304d\u308b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>let<\/code> \u3068 <code>const<\/code> \u306f\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7\u306a\u306e\u3067\u3001\u5358\u306b\u5909\u6570\u3092\u9589\u3058\u8fbc\u3081\u305f\u3044\u3060\u3051\u306a\u3089 <code>{ ... }<\/code> \u3067\u56f2\u3080\u3060\u3051\u3067\u6e08\u307f\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>{\n  const temp = &#39;\u4e00\u6642\u7684\u306a\u5024&#39;;\n  console.log(temp);\n}\n\/\/ \u3053\u3053\u3067\u306f temp \u306f\u53c2\u7167\u3067\u304d\u306a\u3044<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3055\u3089\u306b <code>&lt;script type=\"module\"&gt;<\/code> \u3084ES Modules\u306e\u30d5\u30a1\u30a4\u30eb\u306f\u3001\u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\u306e\u5909\u6570\u304c\u305d\u3082\u305d\u3082\u30b0\u30ed\u30fc\u30d0\u30eb\u306b\u6f0f\u308c\u307e\u305b\u3093\u3002import\/export\u3067\u516c\u958b\u7bc4\u56f2\u3082\u660e\u793a\u3067\u304d\u308b\u306e\u3067\u3001\u30e2\u30b8\u30e5\u30fc\u30eb\u30d1\u30bf\u30fc\u30f3\u3068\u3057\u3066\u306eIIFE\u306f\u307b\u307c\u5f79\u76ee\u3092\u7d42\u3048\u305f\u3068\u8a00\u3063\u3066\u3044\u3044\u3067\u3057\u3087\u3046\u3002\u305f\u3060\u3057\u3001\u95a2\u6570\u30b9\u30b3\u30fc\u30d7\u306e\u4e2d\u3067\u5024\u3092\u8a08\u7b97\u3057\u3066\u623b\u308a\u5024\u3068\u3057\u3066\u53d7\u3051\u53d6\u308b\u3001\u3068\u3044\u3063\u305f\u4f7f\u3044\u65b9\u307e\u3067\u5358\u306a\u308b\u30d6\u30ed\u30c3\u30af\u3067\u7f6e\u304d\u63db\u3048\u3089\u308c\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002React\u3084Vue\u306a\u3069\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u306e\u4e00\u822c\u7684\u306a\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u958b\u767a\u306a\u3089\u3001\u30d3\u30eb\u30c9\u30c4\u30fc\u30eb\u304c\u30e2\u30b8\u30e5\u30fc\u30eb\u5358\u4f4d\u3067\u30b9\u30b3\u30fc\u30d7\u3092\u5206\u3051\u3066\u304f\u308c\u308b\u306e\u3067\u3001\u81ea\u5206\u3067IIFE\u3092\u66f8\u304f\u5834\u9762\u306f\u304b\u306a\u308a\u9650\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%81%9D%E3%82%8C%E3%81%A7%E3%82%82IIFE%E3%81%8C%E6%B4%BB%E8%BA%8D%E3%81%99%E3%82%8B%E5%A0%B4%E9%9D%A2\"><\/span>\u305d\u308c\u3067\u3082IIFE\u304c\u6d3b\u8e8d\u3059\u308b\u5834\u9762<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u65b9\u3067\u3001\u30e2\u30b8\u30e5\u30fc\u30eb\u3068\u3057\u3066\u8aad\u307f\u8fbc\u3081\u306a\u3044\u74b0\u5883\u3067\u306f\u4eca\u3067\u3082IIFE\u304c\u73fe\u5f79\u3067\u3059\u3002\u305f\u3068\u3048\u3070\u30d6\u30c3\u30af\u30de\u30fc\u30af\u30ec\u30c3\u30c8\u306fURL\u6b04\u306b\u8cbc\u308a\u4ed8\u3051\u3066\u5b9f\u884c\u3059\u308b1\u672c\u306e\u30b3\u30fc\u30c9\u306a\u306e\u3067\u3001\u95b2\u89a7\u4e2d\u306e\u30da\u30fc\u30b8\u306e\u5909\u6570\u3068\u885d\u7a81\u3057\u306a\u3044\u3088\u3046IIFE\u3067\u5305\u3080\u306e\u304c\u5b9a\u756a\u3067\u3059\u3002CMS\u306e\u7ba1\u7406\u753b\u9762\u304b\u3089HTML\u306b\u76f4\u63a5script\u3092\u57cb\u3081\u8fbc\u3080\u30b1\u30fc\u30b9\u3067\u3082\u3001IIFE\u3067\u5909\u6570\u3084\u95a2\u6570\u3092\u5c40\u6240\u5316\u3057\u3066\u304a\u3051\u3070\u540d\u524d\u306e\u885d\u7a81\u3092\u9632\u304e\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002\u305f\u3060\u3057DOM\u64cd\u4f5c\u3084\u30a4\u30d9\u30f3\u30c8\u306e\u91cd\u8907\u767b\u9332\u306a\u3069\u3001\u30b9\u30b3\u30fc\u30d7\u4ee5\u5916\u304c\u539f\u56e0\u306e\u5e72\u6e09\u306b\u306f\u5225\u9014\u5bfe\u7b56\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Chrome\u62e1\u5f35\u6a5f\u80fd\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u30b9\u30af\u30ea\u30d7\u30c8\u3067\u3082\u3001\u540c\u3058\u5b9f\u884c\u74b0\u5883\u3067\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u8907\u6570\u56de\u5b9f\u884c\u3059\u308b\u8a2d\u8a08\u3060\u3068\u3001\u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\u306e <code>const<\/code> \u3084 <code>let<\/code> \u306e\u518d\u5ba3\u8a00\u304c\u554f\u984c\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u51e6\u7406\u3092IIFE\u3067\u95a2\u6570\u30b9\u30b3\u30fc\u30d7\u306b\u9589\u3058\u8fbc\u3081\u308c\u3070\u3001\u3053\u3046\u3057\u305f\u885d\u7a81\u3092\u907f\u3051\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002\u3068\u306f\u3044\u3048\u5b9f\u884c\u74b0\u5883\u3084\u6ce8\u5165\u65b9\u6cd5\u306b\u3088\u3063\u3066\u4e8b\u60c5\u306f\u7570\u306a\u308b\u306e\u3067\u3001IIFE\u3060\u3051\u3067\u4e8c\u91cd\u5b9f\u884c\u306e\u554f\u984c\u304c\u3059\u3079\u3066\u89e3\u6c7a\u3059\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u307e\u305f\u3001esbuild\u3084Rollup\u306a\u3069\u306e\u30d0\u30f3\u30c9\u30e9\u30fc\u306b\u306f\u51fa\u529b\u5f62\u5f0f\u3068\u3057\u3066\u300ciife\u300d\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u3066\u3001script\u30bf\u30b0\u3067\u305d\u306e\u307e\u307e\u8aad\u307f\u8fbc\u3081\u308b1\u30d5\u30a1\u30a4\u30eb\u3092\u751f\u6210\u3059\u308b\u3068\u304d\u306b\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002\u81ea\u5206\u3067\u66f8\u304b\u306a\u304f\u3066\u3082\u3001\u88cf\u5074\u3067\u306f\u4eca\u3082IIFE\u304c\u4f7f\u308f\u308c\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%81%BE%E3%81%A8%E3%82%81\"><\/span>\u307e\u3068\u3081<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">IIFE\uff08\u5373\u6642\u5b9f\u884c\u95a2\u6570\u5f0f\uff09\u306f\u3001\u95a2\u6570\u5f0f\u3092\u5b9a\u7fa9\u3057\u305f\u305d\u306e\u5834\u3067\u5b9f\u884c\u3059\u308b\u66f8\u304d\u65b9\u3067\u3001<code>(function(){ ... })();<\/code> \u3068\u3044\u3046\u5f62\u304c\u57fa\u672c\u3067\u3059\u3002\u5916\u5074\u306e\u30ab\u30c3\u30b3\u306f\u300c\u3053\u308c\u306f\u95a2\u6570\u5ba3\u8a00\u3067\u306f\u306a\u304f\u5f0f\u3067\u3059\u300d\u3068\u30a8\u30f3\u30b8\u30f3\u306b\u4f1d\u3048\u308b\u305f\u3081\u306e\u3082\u306e\u3067\u3001\u3053\u3053\u3092\u7406\u89e3\u3057\u3066\u304a\u304f\u3068\u30a2\u30ed\u30fc\u95a2\u6570\u7248\u3084 <code>!function(){}()<\/code> \u306e\u3088\u3046\u306a\u5909\u5f62\u7248\u3092\u898b\u3066\u3082\u6238\u60d1\u308f\u306a\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">IIFE\u304c\u5e83\u304f\u4f7f\u308f\u308c\u3066\u3044\u305f\u7406\u7531\u306f\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u6c5a\u67d3\u3092\u9632\u304e\u3001\u30af\u30ed\u30fc\u30b8\u30e3\u3067\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u306a\u5909\u6570\u3092\u4f5c\u308b\u305f\u3081\u3067\u3057\u305f\u3002<code>var<\/code> \u3057\u304b\u306a\u304f\u3001\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u4ed5\u7d44\u307f\u3082\u306a\u304b\u3063\u305f\u6642\u4ee3\u306b\u306f\u3001\u307b\u307c\u5fc5\u9808\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3060\u3063\u305f\u3068\u8a00\u3063\u3066\u3044\u3044\u3067\u3057\u3087\u3046\u3002jQuery\u306e <code>$<\/code> \u3092\u5f15\u6570\u3067\u53d7\u3051\u53d6\u308b\u30d1\u30bf\u30fc\u30f3\u3084\u3001\u30bb\u30df\u30b3\u30ed\u30f3\u3092\u5148\u982d\u306b\u4ed8\u3051\u308b\u66f8\u304d\u65b9\u3082\u3001\u3053\u306e\u6642\u4ee3\u306e\u5de5\u592b\u306e\u540d\u6b8b\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u73fe\u5728\u306f <code>let<\/code> \/ <code>const<\/code> \u306e\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7\u3084ES Modules\u306e\u304a\u304b\u3052\u3067\u3001\u81ea\u5206\u3067IIFE\u3092\u66f8\u304f\u6a5f\u4f1a\u306f\u78ba\u5b9f\u306b\u6e1b\u308a\u307e\u3057\u305f\u3002\u65b0\u3057\u304f\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u306a\u3089\u3001\u307e\u305a\u306f\u30e2\u30b8\u30e5\u30fc\u30eb\u3084\u30d6\u30ed\u30c3\u30af\u30b9\u30b3\u30fc\u30d7\u3067\u89e3\u6c7a\u3067\u304d\u306a\u3044\u304b\u3092\u8003\u3048\u308b\u306e\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002\u3068\u306f\u3044\u3048\u3001async IIFE\u306ftop-level await\u304c\u4f7f\u3048\u306a\u3044\u74b0\u5883\u3067\u4eca\u3082\u4fbf\u5229\u3067\u3059\u3057\u3001\u30d6\u30c3\u30af\u30de\u30fc\u30af\u30ec\u30c3\u30c8\u3084CMS\u3078\u306e\u57cb\u3081\u8fbc\u307f\u3001Chrome\u62e1\u5f35\u6a5f\u80fd\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u30b9\u30af\u30ea\u30d7\u30c8\u306a\u3069\u300c\u30e2\u30b8\u30e5\u30fc\u30eb\u3068\u3057\u3066\u8aad\u307f\u8fbc\u3081\u306a\u3044\u5834\u6240\u300d\u3067\u306f\u307e\u3060\u307e\u3060\u73fe\u5f79\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53e4\u3044\u30b3\u30fc\u30c9\u3092\u8aad\u3080\u3068\u304d\u306b\u3082\u3001\u65b0\u3057\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3068\u304d\u306b\u3082\u3001IIFE\u306e\u4ed5\u7d44\u307f\u3092\u77e5\u3063\u3066\u304a\u3044\u3066\u640d\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u300c\u306a\u305c\u3053\u306e\u30ab\u30c3\u30b3\u304c\u5fc5\u8981\u306a\u306e\u304b\u300d\u304c\u5206\u304b\u3063\u3066\u3044\u308c\u3070\u3001\u30ec\u30ac\u30b7\u30fc\u306a\u30b3\u30fc\u30c9\u306e\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u3082\u3050\u3063\u3068\u9032\u3081\u3084\u3059\u304f\u306a\u308b\u306f\u305a\u3067\u3059\u3002\u305d\u308c\u3067\u306f\u3001\u30ab\u30c3\u30b3\u306e\u6570\u3092\u6570\u3048\u9593\u9055\u3048\u306a\u3044\u3088\u3046\u306b\u3001\u3088\u3044JavaScript\u30e9\u30a4\u30d5\u3092\uff01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3010\u53c2\u8003\u6587\u732e\u3011<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>IIFE (\u5373\u6642\u5b9f\u884c\u95a2\u6570\u5f0f) &#8211; MDN Web Docs\uff1a<a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Glossary\/IIFE\">https:\/\/developer.mozilla.org\/ja\/docs\/Glossary\/IIFE<\/a><\/li>\n\n\n\n<li>function \u5f0f &#8211; JavaScript | MDN\uff1a<a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Operators\/function\">https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Operators\/function<\/a><\/li>\n\n\n\n<li>Immediately-Invoked Function Expression (IIFE) &#8211; Ben Alman\uff1a<a href=\"https:\/\/benalman.com\/news\/2010\/11\/immediately-invoked-function-expression\/\">https:\/\/benalman.com\/news\/2010\/11\/immediately-invoked-function-expression\/<\/a><\/li>\n\n\n\n<li>JavaScript \u30e2\u30b8\u30e5\u30fc\u30eb &#8211; JavaScript | MDN\uff1a<a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Guide\/Modules\">https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Guide\/Modules<\/a><\/li>\n\n\n\n<li>esbuild &#8211; API\uff08format\uff09\uff1a<a href=\"https:\/\/esbuild.github.io\/api\/#format\">https:\/\/esbuild.github.io\/api\/#format<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript\u306e\u30b3\u30fc\u30c9\u3092\u8aad\u3093\u3067\u3044\u308b\u3068\u3001\u305f\u307e\u306b\u51fa\u3066\u304f\u308b (function(){ &#8230; })(); \u3068\u3044\u3046\u8b0e\u306e\u30ab\u30c3\u30b3\u3060\u3089\u3051\u306e\u66f8\u304d\u65b9\u3002\u521d\u3081\u3066\u898b\u305f\u3068\u304d\u306f\u300c\u306a\u3093\u3067\u3053\u3093\u306a\u306b\u30ab\u30c3\u30b3\u3067\u56f2\u3080\u306e\uff1f\u300d\u3068\u9996\u3092\u304b\u3057\u3052\u305f\u65b9\u3082\u591a\u3044\u306e\u3067\u306f\u306a\u3044 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7915,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[55],"tags":[8,48],"class_list":["post-7914","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\/7914","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=7914"}],"version-history":[{"count":1,"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/posts\/7914\/revisions"}],"predecessor-version":[{"id":7916,"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/posts\/7914\/revisions\/7916"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/media\/7915"}],"wp:attachment":[{"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/media?parent=7914"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/categories?post=7914"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/tags?post=7914"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}