{"id":7902,"date":"2026-09-29T00:23:54","date_gmt":"2026-09-28T15:23:54","guid":{"rendered":"https:\/\/engineering.webstudio168.jp\/blog\/?p=7902"},"modified":"2026-09-29T00:28:18","modified_gmt":"2026-09-28T15:28:18","slug":"javascript%e3%83%bcvoid-0","status":"publish","type":"post","link":"https:\/\/engineering.webstudio168.jp\/blog\/javascript%e3%83%bcvoid-0\/","title":{"rendered":"JavaScript\u306e\u300cvoid 0\u300d\u3068\u306f\uff1fundefined\u3068\u306e\u9055\u3044\u3068\u300cjavascript:void(0)\u300d\u3092\u5352\u696d\u3059\u308b\u65b9\u6cd5"},"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%e3%83%bcvoid-0\/#%E7%B5%90%E8%AB%96%EF%BC%9Avoid_0_%E3%81%AF%E3%80%8C%E3%81%A9%E3%82%93%E3%81%AA%E5%BC%8F%E3%82%92%E8%A9%95%E4%BE%A1%E3%81%97%E3%81%A6%E3%82%82undefined%E3%82%92%E8%BF%94%E3%81%99%E3%80%8D%E6%BC%94%E7%AE%97%E5%AD%90\" >\u7d50\u8ad6\uff1avoid 0 \u306f\u300c\u3069\u3093\u306a\u5f0f\u3092\u8a55\u4fa1\u3057\u3066\u3082undefined\u3092\u8fd4\u3059\u300d\u6f14\u7b97\u5b50<\/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%e3%83%bcvoid-0\/#void0_%E3%81%AE%E6%8B%AC%E5%BC%A7%E3%81%AF%E9%96%A2%E6%95%B0%E5%91%BC%E3%81%B3%E5%87%BA%E3%81%97%E3%81%A7%E3%81%AF%E3%81%AA%E3%81%84\" >void(0) \u306e\u62ec\u5f27\u306f\u95a2\u6570\u547c\u3073\u51fa\u3057\u3067\u306f\u306a\u3044<\/a><\/li><\/ul><\/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%e3%83%bcvoid-0\/#%E3%81%AA%E3%81%9C_undefined_%E3%81%A8%E6%9B%B8%E3%81%8B%E3%81%9A%E3%81%AB_void_0_%E3%82%92%E4%BD%BF%E3%81%86%E3%81%AE%E3%81%8B\" >\u306a\u305c undefined \u3068\u66f8\u304b\u305a\u306b void 0 \u3092\u4f7f\u3046\u306e\u304b<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript%e3%83%bcvoid-0\/#undefined%E3%81%AF%E4%B8%8A%E6%9B%B8%E3%81%8D%E3%83%BB%E3%82%B7%E3%83%A3%E3%83%89%E3%82%A6%E3%81%A7%E3%81%8D%E3%81%A6%E3%81%97%E3%81%BE%E3%81%86\" >undefined\u306f\u4e0a\u66f8\u304d\u30fb\u30b7\u30e3\u30c9\u30a6\u3067\u304d\u3066\u3057\u307e\u3046<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript%e3%83%bcvoid-0\/#%E3%83%9F%E3%83%8B%E3%83%95%E3%82%A1%E3%82%A4%E3%81%A7%E6%96%87%E5%AD%97%E6%95%B0%E3%81%8C%E6%B8%9B%E3%82%8B\" >\u30df\u30cb\u30d5\u30a1\u30a4\u3067\u6587\u5b57\u6570\u304c\u6e1b\u308b<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript%e3%83%bcvoid-0\/#%E3%80%8Cjavascript_void0%E3%80%8D%E3%81%AE%E6%84%8F%E5%91%B3%E3%81%A8%E3%80%81%E4%BB%8A%E3%81%AF%E3%82%82%E3%81%86%E4%BD%BF%E3%82%8F%E3%81%AA%E3%81%84%E3%81%BB%E3%81%86%E3%81%8C%E3%81%84%E3%81%84%E7%90%86%E7%94%B1\" >\u300cjavascript:void(0)\u300d\u306e\u610f\u5473\u3068\u3001\u4eca\u306f\u3082\u3046\u4f7f\u308f\u306a\u3044\u307b\u3046\u304c\u3044\u3044\u7406\u7531<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript%e3%83%bcvoid-0\/#%E3%82%BB%E3%82%AD%E3%83%A5%E3%83%AA%E3%83%86%E3%82%A3%E9%9D%A2%EF%BC%9A%E4%BB%BB%E6%84%8F%E3%81%AE%E3%82%B3%E3%83%BC%E3%83%89%E3%81%8C%E5%8B%95%E3%81%8F%E5%85%A5%E5%8F%A3%E3%81%AB%E3%81%AA%E3%82%8B\" >\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u9762\uff1a\u4efb\u610f\u306e\u30b3\u30fc\u30c9\u304c\u52d5\u304f\u5165\u53e3\u306b\u306a\u308b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript%e3%83%bcvoid-0\/#%E3%82%A2%E3%82%AF%E3%82%BB%E3%82%B7%E3%83%93%E3%83%AA%E3%83%86%E3%82%A3%E9%9D%A2%EF%BC%9A%E3%83%AA%E3%83%B3%E3%82%AF%E3%81%AA%E3%81%AE%E3%81%AB%E3%83%AA%E3%83%B3%E3%82%AF%E3%81%98%E3%82%83%E3%81%AA%E3%81%84\" >\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u9762\uff1a\u30ea\u30f3\u30af\u306a\u306e\u306b\u30ea\u30f3\u30af\u3058\u3083\u306a\u3044<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript%e3%83%bcvoid-0\/#javascript_void0_%E3%81%AE%E4%BB%A3%E3%82%8F%E3%82%8A%E3%81%AB%E6%9B%B8%E3%81%8F%E3%81%B9%E3%81%8D%E3%82%B3%E3%83%BC%E3%83%89\" >javascript:void(0) \u306e\u4ee3\u308f\u308a\u306b\u66f8\u304f\u3079\u304d\u30b3\u30fc\u30c9<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript%e3%83%bcvoid-0\/#%E5%87%A6%E7%90%86%E3%82%92%E5%AE%9F%E8%A1%8C%E3%81%99%E3%82%8B%E3%81%A0%E3%81%91%E3%81%AA%E3%82%89\" >\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u3060\u3051\u306a\u3089 &lt;button type=&#8221;button&#8221;&gt;<\/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%e3%83%bcvoid-0\/#%E9%81%B7%E7%A7%BB%E5%85%88%E3%81%8C%E3%81%82%E3%82%8B%E3%81%AA%E3%82%89%E6%9C%AC%E7%89%A9%E3%81%AEURL_preventDefault\" >\u9077\u79fb\u5148\u304c\u3042\u308b\u306a\u3089\u672c\u7269\u306eURL + preventDefault<\/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%e3%83%bcvoid-0\/#void%E6%BC%94%E7%AE%97%E5%AD%90%E3%81%8C%E4%BB%8A%E3%81%A7%E3%82%82%E6%B4%BB%E8%BA%8D%E3%81%99%E3%82%8B%E5%A0%B4%E9%9D%A2\" >void\u6f14\u7b97\u5b50\u304c\u4eca\u3067\u3082\u6d3b\u8e8d\u3059\u308b\u5834\u9762<\/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%e3%83%bcvoid-0\/#%E3%82%A2%E3%83%AD%E3%83%BC%E9%96%A2%E6%95%B0%E3%81%AE%E6%88%BB%E3%82%8A%E5%80%A4%E3%82%92%E6%84%8F%E5%9B%B3%E3%81%9B%E3%81%9A%E8%BF%94%E3%81%95%E3%81%AA%E3%81%84\" >\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u623b\u308a\u5024\u3092\u610f\u56f3\u305b\u305a\u8fd4\u3055\u306a\u3044<\/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%e3%83%bcvoid-0\/#Promise%E3%82%92%E3%80%8C%E3%81%82%E3%81%88%E3%81%A6%E5%BE%85%E3%81%9F%E3%81%AA%E3%81%84%E3%80%8D%E3%81%93%E3%81%A8%E3%82%92%E6%98%8E%E7%A4%BA%E3%81%99%E3%82%8B\" >Promise\u3092\u300c\u3042\u3048\u3066\u5f85\u305f\u306a\u3044\u300d\u3053\u3068\u3092\u660e\u793a\u3059\u308b<\/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%e3%83%bcvoid-0\/#%E3%81%BE%E3%81%A8%E3%82%81\" >\u307e\u3068\u3081<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/javascript%e3%83%bcvoid-0\/#%E3%80%90%E5%8F%82%E8%80%83%E6%96%87%E7%8C%AE%E3%80%91\" >\u3010\u53c2\u8003\u6587\u732e\u3011<\/a><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\">\u30ec\u30ac\u30b7\u30fc\u306a\u30b5\u30a4\u30c8\u306eHTML\u3092\u89e6\u3063\u3066\u3044\u308b\u3068\u3001<code>&lt;a href=\"javascript:void(0)\"&gt;<\/code>\u3068\u3044\u3046\u8b0e\u306e\u546a\u6587\u306b\u51fa\u304f\u308f\u3059\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3088\u306d\u3002\u30d3\u30eb\u30c9\u5f8c\u306e\u30df\u30cb\u30d5\u30a1\u30a4\u3055\u308c\u305fJS\u3092\u8997\u3044\u3066\u3082\u3001\u3084\u305f\u3089\u3068<code>void 0<\/code>\u304c\u4e26\u3093\u3067\u3044\u308b\u3002\u306a\u3093\u3068\u306a\u304f\u300c\u4f55\u3082\u3057\u306a\u3044\u304a\u307e\u3058\u306a\u3044\u300d\u3060\u3068\u601d\u3063\u3066\u30b9\u30eb\u30fc\u3057\u304c\u3061\u3067\u3059\u304c\u3001\u4e2d\u8eab\u3092\u77e5\u308b\u3068\u610f\u5916\u3068\u5965\u304c\u6df1\u3044\u3093\u3067\u3059\u3002\u4eca\u56de\u306fvoid 0\u306e\u6b63\u4f53\u3068undefined\u3068\u306e\u9055\u3044\u3001\u305d\u3057\u3066\u4eca\u3069\u304d\u306e\u30d5\u30ed\u30f3\u30c8\u30a8\u30f3\u30c9\u3067javascript:void(0)\u3092\u3069\u3046\u7f6e\u304d\u63db\u3048\u308b\u3079\u304d\u304b\u3092\u3001MDN\u3084\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u53c2\u7167\u3057\u306a\u304c\u3089\u6574\u7406\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%B5%90%E8%AB%96%EF%BC%9Avoid_0_%E3%81%AF%E3%80%8C%E3%81%A9%E3%82%93%E3%81%AA%E5%BC%8F%E3%82%92%E8%A9%95%E4%BE%A1%E3%81%97%E3%81%A6%E3%82%82undefined%E3%82%92%E8%BF%94%E3%81%99%E3%80%8D%E6%BC%94%E7%AE%97%E5%AD%90\"><\/span>\u7d50\u8ad6\uff1avoid 0 \u306f\u300c\u3069\u3093\u306a\u5f0f\u3092\u8a55\u4fa1\u3057\u3066\u3082undefined\u3092\u8fd4\u3059\u300d\u6f14\u7b97\u5b50<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305a\u7d50\u8ad6\u304b\u3089\u3002void\u306f\u95a2\u6570\u3067\u306f\u306a\u304f\u3001typeof\u3084delete\u3068\u540c\u3058\u300c\u5358\u9805\u6f14\u7b97\u5b50\u300d\u3067\u3059\u3002\u5f8c\u308d\u306b\u7f6e\u3044\u305f\u5f0f\u3092\u3044\u3063\u305f\u3093\u8a55\u4fa1\u3057\u3066\u3001\u305d\u306e\u7d50\u679c\u3092\u6368\u3066\u3001\u5fc5\u305aundefined\u3092\u8fd4\u3057\u307e\u3059\u3002\u3064\u307e\u308a<code>void 0<\/code>\u306f\u300c0\u3092\u8a55\u4fa1\u3057\u3066\u3001\u6368\u3066\u3066\u3001undefined\u3092\u8fd4\u3059\u300d\u3060\u3051\u306e\u5f0f\u306a\u3093\u3067\u3059\u306d\u30020\u3067\u3042\u308b\u5fc5\u8981\u306f\u307e\u3063\u305f\u304f\u306a\u304f\u3001<code>void 1<\/code>\u3067\u3082<code>void \"8192\"<\/code>\u3067\u3082\u7d50\u679c\u306f\u540c\u3058undefined\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const god = 8192;\nconsole.log(void 0);     \/\/ undefined\nconsole.log(void god);   \/\/ undefined\nconsole.log(void \"GOD\"); \/\/ undefined<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6163\u7fd2\u7684\u306b0\u304c\u4f7f\u308f\u308c\u3066\u3044\u308b\u306e\u306f\u3001\u5358\u7d14\u306b\u4e00\u756a\u77ed\u304f\u3066\u526f\u4f5c\u7528\u306e\u306a\u3044\u5024\u3060\u304b\u3089\u3067\u3057\u3087\u3046\u3002ECMAScript\u306e\u4ed5\u69d8\u66f8\u3092\u898b\u3066\u3082\u3001void\u6f14\u7b97\u5b50\u306e\u51e6\u7406\u306f\u300c\u30aa\u30da\u30e9\u30f3\u30c9\u3092\u8a55\u4fa1\u3057\u3066\u5024\u3092\u53d6\u308a\u51fa\u3057\u3001undefined\u3092\u8fd4\u3059\u300d\u3068\u3044\u3046\u3060\u3051\u306e\u30b7\u30f3\u30d7\u30eb\u306a\u3082\u306e\u3002\u8a55\u4fa1\u306f\u3061\u3083\u3093\u3068\u884c\u308f\u308c\u308b\u306e\u3067\u3001<code>void console.log(\"hi\")<\/code>\u306e\u3088\u3046\u306b\u66f8\u3051\u3070\u30ed\u30b0\u306f\u51fa\u307e\u3059\u3002\u300c\u4f55\u3082\u5b9f\u884c\u3057\u306a\u3044\u300d\u306e\u3067\u306f\u306a\u304f\u300c\u5b9f\u884c\u306f\u3059\u308b\u3051\u3069\u623b\u308a\u5024\u3092\u6368\u3066\u308b\u300d\u3001\u3053\u3053\u304c\u6700\u521d\u306e\u30dd\u30a4\u30f3\u30c8\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"void0_%E3%81%AE%E6%8B%AC%E5%BC%A7%E3%81%AF%E9%96%A2%E6%95%B0%E5%91%BC%E3%81%B3%E5%87%BA%E3%81%97%E3%81%A7%E3%81%AF%E3%81%AA%E3%81%84\"><\/span>void(0) \u306e\u62ec\u5f27\u306f\u95a2\u6570\u547c\u3073\u51fa\u3057\u3067\u306f\u306a\u3044<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u3088\u304f\u898b\u304b\u3051\u308b<code>void(0)<\/code>\u3068\u3044\u3046\u66f8\u304d\u65b9\u3001\u95a2\u6570\u547c\u3073\u51fa\u3057\u3063\u307d\u304f\u898b\u3048\u307e\u3059\u304c\u9055\u3044\u307e\u3059\u3002\u3053\u306e\u62ec\u5f27\u306f\u305f\u3060\u306e\u30b0\u30eb\u30fc\u30d7\u5316\u6f14\u7b97\u5b50\u3067\u3001<code>void (0)<\/code>\u3068\u66f8\u3044\u3066\u3044\u308b\u306e\u3068\u540c\u3058\u3002MDN\u3067\u3082\u300cvoid(0)\u300d\u3068\u300cvoid 0\u300d\u306f\u7b49\u4fa1\u3060\u3068\u660e\u8a18\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u500b\u4eba\u7684\u306b\u306f\u95a2\u6570\u3068\u8aa4\u89e3\u3055\u308c\u3084\u3059\u3044\u306e\u3067<code>void 0<\/code>\u6d3e\u3067\u3059\u304c\u3001\u30c1\u30fc\u30e0\u306e\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u898f\u7d04\u306b\u5408\u308f\u305b\u308c\u3070OK\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u305f\u3060\u3057\u3001\u62ec\u5f27\u3092\u307e\u3063\u305f\u304f\u610f\u8b58\u3057\u306a\u3044\u3068\u75db\u3044\u76ee\u3092\u898b\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002void\u306f\u512a\u5148\u9806\u4f4d\u306e\u9ad8\u3044\u5358\u9805\u6f14\u7b97\u5b50\u306a\u306e\u3067\u3001<code>void 2 === \"2\"<\/code>\u306f<code>(void 2) === \"2\"<\/code>\u3068\u89e3\u91c8\u3055\u308c\u3066false\u306b\u306a\u308a\u307e\u3059\u3002\u6bd4\u8f03\u7d50\u679c\u3092\u307e\u308b\u3054\u3068\u6368\u3066\u305f\u3044\u306a\u3089\u3001<code>void (2 === \"2\")<\/code>\u3068\u62ec\u5f27\u3067\u56f2\u3080\u5fc5\u8981\u304c\u3042\u308b\u308f\u3051\u3067\u3059\u3002\u3053\u3046\u3044\u3046\u306e\u306f\u30ec\u30d3\u30e5\u30fc\u3067\u898b\u843d\u3068\u3057\u304c\u3061\u306a\u306e\u3067\u3001\u8ff7\u3063\u305f\u3089\u62ec\u5f27\u3001\u304c\u5b89\u5168\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>void 2 === \"2\";   \/\/ (void 2) === \"2\" \u2192 false\nvoid (2 === \"2\"); \/\/ undefined<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%81%AA%E3%81%9C_undefined_%E3%81%A8%E6%9B%B8%E3%81%8B%E3%81%9A%E3%81%AB_void_0_%E3%82%92%E4%BD%BF%E3%81%86%E3%81%AE%E3%81%8B\"><\/span>\u306a\u305c undefined \u3068\u66f8\u304b\u305a\u306b void 0 \u3092\u4f7f\u3046\u306e\u304b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u300cundefined\u304c\u6b32\u3057\u3044\u306a\u3089\u7d20\u76f4\u306bundefined\u3068\u66f8\u3051\u3070\u3044\u3044\u3058\u3083\u3093\u300d\u3068\u601d\u3044\u307e\u3059\u3088\u306d\u3002\u50d5\u3082\u6700\u521d\u306f\u305d\u3046\u601d\u3044\u307e\u3057\u305f\u3002\u5b9f\u969b\u3001\u4eca\u306e\u74b0\u5883\u3067\u306f\u307b\u3068\u3093\u3069\u306e\u5834\u5408\u305d\u308c\u3067\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u308c\u3067\u3082void 0\u304c\u4f7f\u308f\u308c\u7d9a\u3051\u3066\u304d\u305f\u306e\u306b\u306f\u3001\u6b74\u53f2\u7684\u306a\u4e8b\u60c5\u3068\u5b9f\u52d9\u7684\u306a\u4e8b\u60c5\u306e2\u3064\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3072\u3068\u3064\u306f\u3001undefined\u304c\u5b9f\u306f\u4e88\u7d04\u8a9e\u3067\u306f\u306a\u3044\u3068\u3044\u3046\u3001JavaScript\u3089\u3057\u3044\u30af\u30bb\u306b\u7531\u6765\u3059\u308b\u3082\u306e\u3002\u3082\u3046\u3072\u3068\u3064\u306f\u3001\u30d3\u30eb\u30c9\u30c4\u30fc\u30eb\u304c\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u524a\u308b\u305f\u3081\u306b\u4f7f\u3063\u3066\u3044\u308b\u3068\u3044\u3046\u3082\u306e\u3002\u3069\u3061\u3089\u3082\u77e5\u3063\u3066\u304a\u304f\u3068\u3001\u30df\u30cb\u30d5\u30a1\u30a4\u5f8c\u306e\u30b3\u30fc\u30c9\u3092\u8aad\u3080\u3068\u304d\u3084\u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u3092\u6539\u4fee\u3059\u308b\u3068\u304d\u306b\u300c\u3042\u3042\u3001\u3053\u308c\u306d\u300d\u3068\u843d\u3061\u7740\u3044\u3066\u5bfe\u51e6\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"undefined%E3%81%AF%E4%B8%8A%E6%9B%B8%E3%81%8D%E3%83%BB%E3%82%B7%E3%83%A3%E3%83%89%E3%82%A6%E3%81%A7%E3%81%8D%E3%81%A6%E3%81%97%E3%81%BE%E3%81%86\"><\/span>undefined\u306f\u4e0a\u66f8\u304d\u30fb\u30b7\u30e3\u30c9\u30a6\u3067\u304d\u3066\u3057\u307e\u3046<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">ESLint\u306eno-void\u30eb\u30fc\u30eb\u306e\u89e3\u8aac\u306b\u3088\u308b\u3068\u3001ES5\u3088\u308a\u524d\u306e\u6642\u4ee3\u306f\u30b0\u30ed\u30fc\u30d0\u30eb\u306eundefined\u304c\u66f8\u304d\u63db\u3048\u53ef\u80fd\u3067\u3057\u305f\u3002\u3064\u307e\u308a<code>undefined = 1<\/code>\u3068\u8ab0\u304b\u304c\u66f8\u3044\u305f\u77ac\u9593\u3001<code>x === undefined<\/code>\u3068\u3044\u3046\u6bd4\u8f03\u304c\u4fe1\u7528\u3067\u304d\u306a\u304f\u306a\u308b\u3002\u305d\u3053\u3067\u3001\u3069\u3093\u306a\u72b6\u6cc1\u3067\u3082\u78ba\u5b9f\u306b\u672c\u7269\u306eundefined\u3092\u8fd4\u3059<code>void 0<\/code>\u304c\u91cd\u5b9d\u3055\u308c\u3066\u3044\u305f\u308f\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u73fe\u5728\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u306f\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u306eundefined\u306f\u66f8\u8fbc\u4e0d\u53ef\u30fb\u8a2d\u5b9a\u4e0d\u53ef\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u305f\u3060\u3057MDN\u306b\u3082\u3042\u308b\u901a\u308a\u3001undefined\u306f\u4e88\u7d04\u8a9e\u3067\u306f\u306a\u3044\u306e\u3067\u3001\u95a2\u6570\u306e\u4e2d\u306a\u3069\u30b0\u30ed\u30fc\u30d0\u30eb\u4ee5\u5916\u306e\u30b9\u30b3\u30fc\u30d7\u3067\u306f\u5909\u6570\u540d\u3068\u3057\u3066\u4f7f\u3048\u3066\u3057\u307e\u3044\u307e\u3059\u3002<code>const undefined = \"foo\"<\/code>\u307f\u305f\u3044\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u4eba\u306f\u307e\u305a\u3044\u306a\u3044\u3068\u601d\u3044\u307e\u3059\u304c\uff08\u3044\u305f\u3089\u5168\u529b\u3067\u6b62\u3081\u307e\u3059\uff09\u3001\u7406\u5c48\u306e\u4e0a\u3067\u306f\u4eca\u3067\u3082\u300cvoid 0\u306e\u307b\u3046\u304c\u78ba\u5b9f\u300d\u306a\u3093\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u3053\u3093\u306a\u3053\u3068\u306f\u3057\u306a\u3044\u3053\u3068\uff01\uff08\u3084\u3081\u3066\u3047\u30fc\u30fc\uff01\uff09\n(() =&gt; {\n  const undefined = \"foo\";\n  console.log(undefined, typeof undefined); \/\/ foo string\n  console.log(void 0);                      \/\/ undefined\n})();<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%83%9F%E3%83%8B%E3%83%95%E3%82%A1%E3%82%A4%E3%81%A7%E6%96%87%E5%AD%97%E6%95%B0%E3%81%8C%E6%B8%9B%E3%82%8B\"><\/span>\u30df\u30cb\u30d5\u30a1\u30a4\u3067\u6587\u5b57\u6570\u304c\u6e1b\u308b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u3082\u3046\u3072\u3068\u3064\u306e\u7406\u7531\u306f\u3082\u3063\u3068\u73fe\u5b9f\u7684\u3067\u3001\u5358\u7d14\u306b\u77ed\u3044\u304b\u3089\u3002<code>undefined<\/code>\u306f9\u6587\u5b57\u3001<code>void 0<\/code>\u306f6\u6587\u5b57\u3067\u3059\u3002\u305f\u3063\u305f3\u6587\u5b57\u3067\u3059\u304c\u3001\u5927\u898f\u6a21\u306a\u30d0\u30f3\u30c9\u30eb\u3067\u306f\u4f55\u767e\u30fb\u4f55\u5343\u7b87\u6240\u3068\u51fa\u3066\u304f\u308b\u306e\u3067\u3001\u7a4d\u307f\u91cd\u306a\u308b\u3068\u7121\u8996\u3067\u304d\u307e\u305b\u3093\u3002ESLint\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3067\u3082\u3001void 0\u304cundefined\u3088\u308a\u77ed\u3044\u3053\u3068\u304b\u3089\u30df\u30cb\u30d5\u30a1\u30a4\u7528\u9014\u3067\u4f7f\u308f\u308c\u308b\u3001\u3068\u7d39\u4ecb\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u306a\u306e\u3067\u3001\u30d3\u30eb\u30c9\u5f8c\u306eJS\u3092\u30c7\u30d9\u30ed\u30c3\u30d1\u30fc\u30c4\u30fc\u30eb\u306e\u30bd\u30fc\u30b9\u30d1\u30cd\u30eb\u3067\u958b\u3044\u305f\u3068\u304d\u306b<code>void 0<\/code>\u304c\u30ba\u30e9\u30c3\u3068\u4e26\u3093\u3067\u3044\u3066\u3082\u3001\u305d\u308c\u306f\u30d0\u30b0\u3067\u3082\u6697\u53f7\u3067\u3082\u306a\u304f\u300cundefined\u3092\u5727\u7e2e\u3057\u305f\u59ff\u300d\u3067\u3059\u3002\u30bd\u30fc\u30b9\u30de\u30c3\u30d7\u3092\u5f53\u3066\u308c\u3070\u3001\u5143\u306e\u30b3\u30fc\u30c9\u3067\u306f\u666e\u901a\u306bundefined\u3068\u66f8\u304b\u308c\u3066\u3044\u308b\u306f\u305a\u3002\u50d5\u306f\u3053\u308c\u3092\u77e5\u308b\u307e\u3067\u3001minify\u3055\u308c\u305f\u30d5\u30a1\u30a4\u30eb\u3092\u898b\u308b\u305f\u3073\u306b\u300c\u4f55\u3053\u306e\u546a\u6587\u2026\u2026\u300d\u3068\u56fa\u307e\u3063\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%80%8Cjavascript_void0%E3%80%8D%E3%81%AE%E6%84%8F%E5%91%B3%E3%81%A8%E3%80%81%E4%BB%8A%E3%81%AF%E3%82%82%E3%81%86%E4%BD%BF%E3%82%8F%E3%81%AA%E3%81%84%E3%81%BB%E3%81%86%E3%81%8C%E3%81%84%E3%81%84%E7%90%86%E7%94%B1\"><\/span>\u300cjavascript:void(0)\u300d\u306e\u610f\u5473\u3068\u3001\u4eca\u306f\u3082\u3046\u4f7f\u308f\u306a\u3044\u307b\u3046\u304c\u3044\u3044\u7406\u7531<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u3055\u3066\u672c\u984c\u3002\u691c\u7d22\u3067\u3053\u3053\u306b\u6765\u305f\u65b9\u306e\u591a\u304f\u306f\u3001\u304a\u305d\u3089\u304f<code>&lt;a href=\"javascript:void(0)\"&gt;<\/code>\u306e\u610f\u5473\u304c\u77e5\u308a\u305f\u304b\u3063\u305f\u3093\u3058\u3083\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002\u3053\u308c\u306f\u300cjavascript:\u300d\u3068\u3044\u3046URL\u30b9\u30ad\u30fc\u30e0\u3068void\u6f14\u7b97\u5b50\u306e\u5408\u308f\u305b\u6280\u3067\u3059\u3002javascript:\u3067\u59cb\u307e\u308bURL\u306b\u30d6\u30e9\u30a6\u30b6\u304c\u9077\u79fb\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u3001URL\u306e\u4e2d\u8eab\u304c\u30b9\u30af\u30ea\u30d7\u30c8\u3068\u3057\u3066\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3084\u3063\u304b\u3044\u306a\u306e\u306f\u3001\u305d\u306e\u30b9\u30af\u30ea\u30d7\u30c8\u306e\u7d50\u679c\u304c\u6587\u5b57\u5217\u3060\u3063\u305f\u5834\u5408\u3001\u30d6\u30e9\u30a6\u30b6\u306f\u305d\u308c\u3092HTML\u3068\u3057\u3066\u6271\u3044\u3001\u30da\u30fc\u30b8\u306e\u4e2d\u8eab\u3092\u7f6e\u304d\u63db\u3048\u3066\u3057\u307e\u3046\u3053\u3068\u3002\u305d\u3053\u3067\u6700\u5f8c\u306bvoid(0)\u3092\u7f6e\u3044\u3066\u7d50\u679c\u3092\u5f37\u5236\u7684\u306bundefined\u306b\u3057\u3001\u300c\u5b9f\u884c\u3060\u3051\u3057\u3066\u3001\u753b\u9762\u306f\u4f55\u3082\u5909\u3048\u306a\u3044\u300d\u30ea\u30f3\u30af\u3092\u4f5c\u3063\u3066\u3044\u305f\u308f\u3051\u3067\u3059\u3002jQuery\u5168\u76db\u671f\u306e\u30b5\u30a4\u30c8\u3084CMS\u306e\u53e4\u3044\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3067\u306f\u3001\u4eca\u3067\u3082\u666e\u901a\u306b\u73fe\u5f79\u3067\u898b\u304b\u3051\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- \u3046\u3093\u3001\u6614\u306f\u3088\u304f\u66f8\u3044\u3066\u307e\u3057\u305f --&gt;\n&lt;a href=\"javascript:void(0)\" onclick=\"openModal()\"&gt;\u8a73\u3057\u304f\u898b\u308b&lt;\/a&gt;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%82%BB%E3%82%AD%E3%83%A5%E3%83%AA%E3%83%86%E3%82%A3%E9%9D%A2%EF%BC%9A%E4%BB%BB%E6%84%8F%E3%81%AE%E3%82%B3%E3%83%BC%E3%83%89%E3%81%8C%E5%8B%95%E3%81%8F%E5%85%A5%E5%8F%A3%E3%81%AB%E3%81%AA%E3%82%8B\"><\/span>\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u9762\uff1a\u4efb\u610f\u306e\u30b3\u30fc\u30c9\u304c\u52d5\u304f\u5165\u53e3\u306b\u306a\u308b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">MDN\u306ejavascript: URL\u306e\u30da\u30fc\u30b8\u306b\u306f\u3001\u3053\u306e\u4ed5\u7d44\u307f\u306feval()\u3068\u540c\u3058\u3088\u3046\u306b\u4efb\u610f\u306e\u30b3\u30fc\u30c9\u5b9f\u884c\u306b\u3064\u306a\u304c\u308a\u3046\u308b\u305f\u3081\u3001\u4f7f\u7528\u306f\u63a8\u5968\u3055\u308c\u306a\u3044\u3068\u3044\u3046\u8b66\u544a\u304c\u306f\u3063\u304d\u308a\u66f8\u304b\u308c\u3066\u3044\u307e\u3059\u3002\u81ea\u5206\u3067\u66f8\u3044\u305fvoid(0)\u81ea\u4f53\u306f\u7121\u5bb3\u3067\u3082\u3001\u300chref\u306bjavascript:\u3092\u66f8\u3051\u308b\u300d\u8a2d\u8a08\u305d\u306e\u3082\u306e\u304c\u653b\u6483\u9762\u306b\u306a\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">React\u30c1\u30fc\u30e0\u30822019\u5e74\u306ev16.9\u306e\u30ea\u30ea\u30fc\u30b9\u3067\u3001javascript:\u3067\u59cb\u307e\u308bURL\u3092\u5371\u967a\u306a\u653b\u6483\u9762\u3060\u3068\u3057\u3066\u975e\u63a8\u5968\u306b\u3057\u307e\u3057\u305f\u3002\u30e6\u30fc\u30b6\u30fc\u306e\u30d7\u30ed\u30d5\u30a3\u30fc\u30ebURL\u306e\u3088\u3046\u306a\u672a\u691c\u8a3c\u306e\u5024\u3092href\u306b\u6d41\u3057\u8fbc\u3093\u3060\u77ac\u9593\u3001\u30b9\u30af\u30ea\u30d7\u30c8\u304c\u4ed5\u8fbc\u307e\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u304b\u3089\u3067\u3059\u3002\u5f53\u6642\u306e\u767a\u8868\u3067\u306f\u300c16.9\u3067\u306f\u8b66\u544a\u3001\u5c06\u6765\u306e\u30e1\u30b8\u30e3\u30fc\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u306f\u30a8\u30e9\u30fc\u306b\u3059\u308b\u300d\u3068\u4e88\u544a\u3055\u308c\u3066\u3044\u3066\u3001eslint-plugin-react\u306bjsx-no-script-url\u3068\u3044\u3046\u5c02\u7528\u30eb\u30fc\u30eb\u307e\u3067\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%82%A2%E3%82%AF%E3%82%BB%E3%82%B7%E3%83%93%E3%83%AA%E3%83%86%E3%82%A3%E9%9D%A2%EF%BC%9A%E3%83%AA%E3%83%B3%E3%82%AF%E3%81%AA%E3%81%AE%E3%81%AB%E3%83%AA%E3%83%B3%E3%82%AF%E3%81%98%E3%82%83%E3%81%AA%E3%81%84\"><\/span>\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u9762\uff1a\u30ea\u30f3\u30af\u306a\u306e\u306b\u30ea\u30f3\u30af\u3058\u3083\u306a\u3044<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u3082\u3046\u3072\u3068\u3064\u306e\u554f\u984c\u304c\u3001\u898b\u305f\u76ee\u306f\u30ea\u30f3\u30af\u306a\u306e\u306b\u4e2d\u8eab\u306f\u30dc\u30bf\u30f3\u3068\u3044\u3046\u300c\u306a\u3093\u3061\u3083\u3063\u3066\u30dc\u30bf\u30f3\u300d\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u3053\u3068\u3002MDN\u306e&lt;a&gt;\u8981\u7d20\u306e\u30da\u30fc\u30b8\u3067\u306f\u3001href\u306b#\u3084javascript:void(0)\u3092\u5165\u308c\u3066\u30af\u30ea\u30c3\u30af\u30a4\u30d9\u30f3\u30c8\u3067\u51e6\u7406\u3059\u308b\u4f7f\u3044\u65b9\u3092\u3001\u507d\u7269\u306e\u30dc\u30bf\u30f3\u3068\u3057\u3066\u4e71\u7528\u3055\u308c\u308b\u30d1\u30bf\u30fc\u30f3\u3060\u3068\u6307\u6458\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5177\u4f53\u7684\u306b\u306f\u3001\u65b0\u3057\u3044\u30bf\u30d6\u3067\u958b\u3053\u3046\u3068\u3057\u305f\u308a\u3001\u30ea\u30f3\u30af\u3092\u30b3\u30d4\u30fc\u3057\u305f\u308a\u3001\u30d6\u30c3\u30af\u30de\u30fc\u30af\u3057\u305f\u308a\u3057\u305f\u3068\u304d\u306b\u610f\u56f3\u3057\u306a\u3044\u52d5\u304d\u306b\u306a\u308a\u307e\u3059\u3002\u30b9\u30af\u30ea\u30fc\u30f3\u30ea\u30fc\u30c0\u30fc\u306b\u3082\u300c\u30ea\u30f3\u30af\u300d\u3068\u3057\u3066\u8aad\u307f\u4e0a\u3052\u3089\u308c\u308b\u306e\u3067\u3001\u62bc\u3057\u305f\u3089\u753b\u9762\u9077\u79fb\u3059\u308b\u3068\u671f\u5f85\u3057\u305f\u30e6\u30fc\u30b6\u30fc\u3092\u88cf\u5207\u308b\u3053\u3068\u306b\u3002\u696d\u52d9\u3067\u4f7f\u3046\u30c4\u30fc\u30eb\u3084EC\u30b5\u30a4\u30c8\u307b\u3069\u3001\u3053\u3046\u3044\u3046\u5730\u5473\u306a\u9055\u548c\u611f\u304c\u30b9\u30c8\u30ec\u30b9\u306b\u306a\u308b\u3093\u3067\u3059\u3088\u306d\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"javascript_void0_%E3%81%AE%E4%BB%A3%E3%82%8F%E3%82%8A%E3%81%AB%E6%9B%B8%E3%81%8F%E3%81%B9%E3%81%8D%E3%82%B3%E3%83%BC%E3%83%89\"><\/span>javascript:void(0) \u306e\u4ee3\u308f\u308a\u306b\u66f8\u304f\u3079\u304d\u30b3\u30fc\u30c9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u3058\u3083\u3042\u4f55\u306b\u7f6e\u304d\u63db\u3048\u308c\u3070\u3044\u3044\u306e\u304b\u3002\u5224\u65ad\u57fa\u6e96\u306f\u30b7\u30f3\u30d7\u30eb\u3067\u3001\u300c\u3069\u3053\u304b\u5225\u306e\u5834\u6240\u306b\u79fb\u52d5\u3059\u308b\u306a\u3089\u30ea\u30f3\u30af\u3001\u305d\u306e\u5834\u3067\u4f55\u304b\u3092\u5b9f\u884c\u3059\u308b\u306a\u3089\u30dc\u30bf\u30f3\u300d\u3067\u3059\u3002\u30e2\u30fc\u30c0\u30eb\u3092\u958b\u304f\u3001\u30a2\u30b3\u30fc\u30c7\u30a3\u30aa\u30f3\u3092\u958b\u9589\u3059\u308b\u3001\u30bf\u30d6\u3092\u5207\u308a\u66ff\u3048\u308b\u2026\u2026\u3053\u3046\u3044\u3063\u305f\u51e6\u7406\u306f\u307b\u307c\u3059\u3079\u3066\u30dc\u30bf\u30f3\u306e\u4ed5\u4e8b\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u898b\u305f\u76ee\u3092\u30ea\u30f3\u30af\u98a8\u306b\u3057\u305f\u3044\u304b\u3089a\u30bf\u30b0\u3092\u4f7f\u3046\u3001\u3068\u3044\u3046\u7406\u7531\u3067javascript:void(0)\u3092\u66f8\u3044\u3066\u3044\u305f\u30b1\u30fc\u30b9\u3082\u591a\u3044\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u898b\u305f\u76ee\u306fCSS\u3067\u3069\u3046\u3068\u3067\u3082\u306a\u308a\u307e\u3059\u3002\u3053\u3053\u304b\u3089\u306f\u5b9f\u969b\u306b\u7f6e\u304d\u63db\u3048\u308b\u3068\u304d\u306e\u30d1\u30bf\u30fc\u30f3\u30922\u3064\u7d39\u4ecb\u3057\u307e\u3059\u3002\u30ec\u30ac\u30b7\u30fc\u6539\u4fee\u306e\u3068\u304d\u306b\u305d\u306e\u307e\u307e\u30b3\u30d4\u30da\u3057\u3066\u4f7f\u3063\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%87%A6%E7%90%86%E3%82%92%E5%AE%9F%E8%A1%8C%E3%81%99%E3%82%8B%E3%81%A0%E3%81%91%E3%81%AA%E3%82%89\"><\/span>\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u3060\u3051\u306a\u3089 &lt;button type=&#8221;button&#8221;&gt;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30e2\u30fc\u30c0\u30eb\u3092\u958b\u304f\u306a\u3069\u300c\u305d\u306e\u5834\u3067\u5b8c\u7d50\u3059\u308b\u51e6\u7406\u300d\u306f\u3001\u7d20\u76f4\u306bbutton\u8981\u7d20\u306b\u3057\u307e\u3057\u3087\u3046\u3002type=&#8221;button&#8221;\u3092\u4ed8\u3051\u3066\u304a\u304b\u306a\u3044\u3068\u3001form\u8981\u7d20\u306e\u4e2d\u306b\u7f6e\u3044\u305f\u3068\u304d\u306b\u9001\u4fe1\u30dc\u30bf\u30f3\u6271\u3044\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u306e\u3067\u8981\u6ce8\u610f\u3067\u3059\u3002\u30ad\u30fc\u30dc\u30fc\u30c9\u64cd\u4f5c\uff08Enter\u3084Space\uff09\u3084\u30d5\u30a9\u30fc\u30ab\u30b9\u306e\u6271\u3044\u3082\u30d6\u30e9\u30a6\u30b6\u304c\u9762\u5012\u3092\u898b\u3066\u304f\u308c\u308b\u306e\u3067\u3001a\u30bf\u30b0\u3067\u81ea\u524d\u5b9f\u88c5\u3059\u308b\u3088\u308a\u5727\u5012\u7684\u306b\u30e9\u30af\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u898b\u305f\u76ee\u3092\u30c6\u30ad\u30b9\u30c8\u30ea\u30f3\u30af\u306b\u5bc4\u305b\u305f\u3044\u3068\u304d\u306f\u3001\u30dc\u30bf\u30f3\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u30b9\u30bf\u30a4\u30eb\u3092\u30ea\u30bb\u30c3\u30c8\u3059\u308b\u3060\u3051\u3002\u80cc\u666f\u3068\u67a0\u7dda\u3092\u6d88\u3057\u3066\u3001\u8272\u3068\u4e0b\u7dda\u3092\u30ea\u30f3\u30af\u3063\u307d\u304f\u3059\u308c\u3070\u307b\u307c\u898b\u5206\u3051\u304c\u3064\u304d\u307e\u305b\u3093\u3002\u30d5\u30a9\u30fc\u30ab\u30b9\u30ea\u30f3\u30b0\u307e\u3067\u6d88\u3057\u3066\u3057\u307e\u3046\u3068\u30ad\u30fc\u30dc\u30fc\u30c9\u30e6\u30fc\u30b6\u30fc\u304c\u8ff7\u5b50\u306b\u306a\u308b\u306e\u3067\u3001:focus-visible\u306f\u6b8b\u3057\u3066\u304a\u304f\u306e\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- \u826f\u3055\u3052\u306a\u30b5\u30f3\u30d7\u30eb --&gt;\n&lt;button type=\"button\" class=\"text-link\" id=\"openModal\"&gt;\u8a73\u3057\u304f\u898b\u308b&lt;\/button&gt;\n\n&lt;style&gt;\n.text-link {\n  background: none;\n  border: 0;\n  padding: 0;\n  font: inherit;\n  color: inherit;\n  text-decoration: underline;\n  cursor: pointer;\n}\n&lt;\/style&gt;\n\n&lt;script&gt;\ndocument.getElementById('openModal').addEventListener('click', () =&gt; {\n  openModal();\n});\n&lt;\/script&gt;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E9%81%B7%E7%A7%BB%E5%85%88%E3%81%8C%E3%81%82%E3%82%8B%E3%81%AA%E3%82%89%E6%9C%AC%E7%89%A9%E3%81%AEURL_preventDefault\"><\/span>\u9077\u79fb\u5148\u304c\u3042\u308b\u306a\u3089\u672c\u7269\u306eURL + preventDefault<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u65b9\u3067\u300cJavaScript\u304c\u52d5\u3051\u3070\u305d\u306e\u5834\u3067\u30e2\u30fc\u30c0\u30eb\u8868\u793a\u3001\u52d5\u304b\u306a\u3051\u308c\u3070\u8a73\u7d30\u30da\u30fc\u30b8\u306b\u9077\u79fb\u300d\u306e\u3088\u3046\u306b\u3001\u3061\u3083\u3093\u3068\u884c\u304d\u5148\u304c\u3042\u308b\u5834\u5408\u306fa\u30bf\u30b0\u306e\u307e\u307e\u3067OK\u3067\u3059\u3002href\u306b\u306f\u5b9f\u5728\u3059\u308bURL\u3092\u66f8\u304d\u3001\u30af\u30ea\u30c3\u30af\u6642\u306bevent.preventDefault()\u3067\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u9077\u79fb\u3092\u6b62\u3081\u3066\u304b\u3089JS\u5074\u306e\u51e6\u7406\u3092\u8d70\u3089\u305b\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u66f8\u304d\u65b9\u306a\u3089\u3001\u65b0\u3057\u3044\u30bf\u30d6\u3067\u958b\u304d\u305f\u3044\u4eba\u306f\u666e\u901a\u306b\u958b\u3051\u308b\u3057\u3001JS\u306e\u8aad\u307f\u8fbc\u307f\u306b\u5931\u6557\u3057\u3066\u3082\u6700\u4f4e\u9650\u30da\u30fc\u30b8\u9077\u79fb\u306f\u3067\u304d\u308b\u3002\u3061\u306a\u307f\u306bhref=&#8221;#&#8221;\u3067\u4ee3\u7528\u3059\u308b\u66f8\u304d\u65b9\u3082\u3088\u304f\u898b\u307e\u3059\u304c\u3001\u30da\u30fc\u30b8\u306e\u30c8\u30c3\u30d7\u306b\u30b9\u30af\u30ed\u30fc\u30eb\u3057\u305f\u308aURL\u306b#\u304c\u4ed8\u3044\u305f\u308a\u3059\u308b\u306e\u3067\u3001javascript:void(0)\u306e\u4ee3\u308f\u308a\u3068\u3057\u3066\u306f\u5fae\u5999\u3067\u3059\u3002\uff08\u73fe\u5834\u3067\u4e00\u756a\u3088\u304f\u898b\u308b\u30d1\u30bf\u30fc\u30f3\u306a\u3093\u3067\u3059\u3051\u3069\u306d\u2026\u2026\uff09<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;a href=\"\/items\/8192\/\" class=\"js-quick-view\"&gt;\u5546\u54c1\u8a73\u7d30\u3092\u898b\u308b&lt;\/a&gt;\n\n&lt;script&gt;\ndocument.querySelectorAll('.js-quick-view').forEach((link) =&gt; {\n  link.addEventListener('click', (e) =&gt; {\n    e.preventDefault();\n    openQuickView(link.href);\n  });\n});\n&lt;\/script&gt;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"void%E6%BC%94%E7%AE%97%E5%AD%90%E3%81%8C%E4%BB%8A%E3%81%A7%E3%82%82%E6%B4%BB%E8%BA%8D%E3%81%99%E3%82%8B%E5%A0%B4%E9%9D%A2\"><\/span>void\u6f14\u7b97\u5b50\u304c\u4eca\u3067\u3082\u6d3b\u8e8d\u3059\u308b\u5834\u9762<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u3053\u307e\u3067\u8aad\u3080\u3068\u300cvoid\u3063\u3066\u3082\u3046\u8981\u3089\u306a\u3044\u5b50\u306a\u306e\u3067\u306f\uff1f\u300d\u3068\u601d\u3046\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u3067\u3082\u3001javascript:void(0)\u304c\u30c0\u30e1\u306a\u3060\u3051\u3067\u3001void\u6f14\u7b97\u5b50\u305d\u306e\u3082\u306e\u306f\u4eca\u3067\u3082\u4fbf\u5229\u306a\u5834\u9762\u304c\u3042\u308a\u307e\u3059\u3002\u3080\u3057\u308d\u30e2\u30c0\u30f3\u306aJavaScript\u3084TypeScript\u306e\u307b\u3046\u304c\u51fa\u756a\u304c\u3042\u308b\u3001\u3068\u3044\u3046\u306e\u304c\u500b\u4eba\u7684\u306a\u5370\u8c61\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u300c\u623b\u308a\u5024\u3092\u6368\u3066\u308b\u3053\u3068\u3092\u660e\u793a\u3059\u308b\u300d\u3002\u5024\u3092\u8fd4\u3059\u5f0f\u3092\u3042\u3048\u3066\u7121\u8996\u3057\u305f\u3044\u3068\u304d\u3001void\u3092\u4ed8\u3051\u3066\u304a\u304f\u3068\u8aad\u307f\u624b\u306b\u3082Linter\u306b\u3082\u610f\u56f3\u304c\u4f1d\u308f\u308a\u307e\u3059\u3002\u4ee3\u8868\u7684\u306a2\u3064\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u898b\u3066\u307f\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%AE%E6%88%BB%E3%82%8A%E5%80%A4%E3%82%92%E6%84%8F%E5%9B%B3%E3%81%9B%E3%81%9A%E8%BF%94%E3%81%95%E3%81%AA%E3%81%84\"><\/span>\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u623b\u308a\u5024\u3092\u610f\u56f3\u305b\u305a\u8fd4\u3055\u306a\u3044<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30a2\u30ed\u30fc\u95a2\u6570\u306f\u4e2d\u62ec\u5f27\u3092\u7701\u7565\u3059\u308b\u3068\u3001\u5f0f\u306e\u7d50\u679c\u3092\u305d\u306e\u307e\u307e\u8fd4\u3057\u307e\u3059\u3002MDN\u3067\u306f\u3001<code>checkbox.onclick = () =&gt; doSomething();<\/code>\u3068\u66f8\u3044\u305f\u3068\u304d\u3001doSomething()\u304cfalse\u3092\u8fd4\u3059\u3068\u30cf\u30f3\u30c9\u30e9\u30fc\u306e\u623b\u308a\u5024\u3082false\u306b\u306a\u308a\u3001\u30c1\u30a7\u30c3\u30af\u30dc\u30c3\u30af\u30b9\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u52d5\u4f5c\u304c\u6b62\u307e\u3063\u3066\u3057\u307e\u3046\u4f8b\u304c\u7d39\u4ecb\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3092\u9632\u3050\u306e\u304c<code>() =&gt; void doSomething()<\/code>\u3068\u3044\u3046\u66f8\u304d\u65b9\u3002\u623b\u308a\u5024\u304c\u5fc5\u305aundefined\u306b\u306a\u308b\u306e\u3067\u3001\u95a2\u6570\u5074\u306e\u4ed5\u69d8\u304c\u5909\u308f\u3063\u3066\u3082\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u30fc\u306e\u6319\u52d5\u304c\u52dd\u624b\u306b\u5909\u308f\u308a\u307e\u305b\u3093\u3002\u5730\u5473\u3067\u3059\u304c\u3001\u4ed6\u4eba\u304c\u66f8\u3044\u305f\u95a2\u6570\u3084\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u95a2\u6570\u3092\u547c\u3076\u3068\u304d\u306e\u4fdd\u967a\u3068\u3057\u3066\u306f\u304b\u306a\u308a\u6709\u52b9\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ doSomething() \u304c false \u3092\u8fd4\u3059\u3068\u30c1\u30a7\u30c3\u30af\u3067\u304d\u306a\u304f\u306a\u308b\u2026\u2026\ncheckbox.onclick = () =&gt; doSomething();\n\n\/\/ \u623b\u308a\u5024\u3092\u6368\u3066\u308b\u306e\u3067\u5b89\u5fc3\ncheckbox.onclick = () =&gt; void doSomething();<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Promise%E3%82%92%E3%80%8C%E3%81%82%E3%81%88%E3%81%A6%E5%BE%85%E3%81%9F%E3%81%AA%E3%81%84%E3%80%8D%E3%81%93%E3%81%A8%E3%82%92%E6%98%8E%E7%A4%BA%E3%81%99%E3%82%8B\"><\/span>Promise\u3092\u300c\u3042\u3048\u3066\u5f85\u305f\u306a\u3044\u300d\u3053\u3068\u3092\u660e\u793a\u3059\u308b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">TypeScript\u3067typescript-eslint\u3092\u4f7f\u3063\u3066\u3044\u308b\u3068\u3001await\u3082catch\u3082\u3057\u3066\u3044\u306a\u3044Promise\u3092no-floating-promises\u30eb\u30fc\u30eb\u3067\u6012\u3089\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3088\u306d\u3002\u3053\u306e\u30eb\u30fc\u30eb\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u3001void\u6f14\u7b97\u5b50\u3092\u4ed8\u3051\u305fPromise\u3092\u300c\u610f\u56f3\u7684\u306b\u5f85\u305f\u306a\u3044\u3082\u306e\u300d\u3068\u3057\u3066\u6271\u3063\u3066\u304f\u308c\u307e\u3059\u3002\u30ed\u30b0\u9001\u4fe1\u306e\u3088\u3046\u306a\u5f85\u3064\u5fc5\u8981\u306e\u306a\u3044\u975e\u540c\u671f\u51e6\u7406\u306f\u3001<code>void sendLog()<\/code>\u3068\u66f8\u3051\u3070OK\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u305f\u3060\u3057ESLint\u672c\u4f53\u306eno-void\u30eb\u30fc\u30eb\u3092\u6709\u52b9\u306b\u3057\u3066\u3044\u308b\u3068\u3001\u4eca\u5ea6\u306fvoid\u305d\u306e\u3082\u306e\u304c\u7981\u6b62\u3055\u308c\u3066\u677f\u631f\u307f\u306b\u306a\u308a\u307e\u3059\u3002\u305d\u306e\u5834\u5408\u306fno-void\u306eallowAsStatement\u30aa\u30d7\u30b7\u30e7\u30f3\u3092true\u306b\u3057\u3066\u3001\u6587\u3068\u3057\u3066\u306evoid\u3060\u3051\u8a31\u53ef\u3059\u308b\u306e\u304c\u5b9a\u756a\u306e\u843d\u3068\u3057\u3069\u3053\u308d\u3067\u3059\u3002\u3061\u306a\u307f\u306bTypeScript\u306e\u578b\u6ce8\u91c8\u3067\u4f7f\u3046<code>: void<\/code>\u306f\u300c\u623b\u308a\u5024\u3092\u4f7f\u308f\u306a\u3044\u300d\u3068\u3044\u3046\u578b\u306e\u8a71\u3067\u3001void\u6f14\u7b97\u5b50\u3068\u306f\u5225\u7269\u306a\u306e\u3067\u6df7\u540c\u3057\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ eslint.config.js\uff08\u62bd\u7c8b\uff09\nrules: {\n  'no-void': &#91;'error', { allowAsStatement: true }],\n  '@typescript-eslint\/no-floating-promises': 'error',\n}\n\n\/\/ \u5f85\u305f\u306a\u304f\u3066\u3044\u3044\u975e\u540c\u671f\u51e6\u7406\nvoid sendLog('clicked');<\/code><\/pre>\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\">void 0\u306f\u300c\u5f0f\u3092\u8a55\u4fa1\u3057\u3066\u3001\u5fc5\u305aundefined\u3092\u8fd4\u3059\u300d\u3060\u3051\u306e\u5358\u9805\u6f14\u7b97\u5b50\u3067\u3059\u3002void(0)\u306e\u62ec\u5f27\u306f\u95a2\u6570\u547c\u3073\u51fa\u3057\u3067\u306f\u306a\u304f\u305f\u3060\u306e\u30b0\u30eb\u30fc\u30d7\u5316\u3067\u3001\u30df\u30cb\u30d5\u30a1\u30a4\u5f8c\u306e\u30b3\u30fc\u30c9\u306bvoid 0\u304c\u5927\u91cf\u306b\u3042\u308b\u306e\u306f\u3001undefined\u3088\u308a\u77ed\u304f\u3001\u304b\u3064\u78ba\u5b9f\u306bundefined\u3092\u5f97\u3089\u308c\u308b\u304b\u3089\u3067\u3057\u305f\u3002\u6b63\u4f53\u304c\u5206\u304b\u308c\u3070\u3001\u3082\u3046\u546a\u6587\u306b\u306f\u898b\u3048\u306a\u3044\u306f\u305a\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u305d\u3057\u3066javascript:void(0)\u306f\u3001javascript: URL\u3067\u753b\u9762\u3092\u66f8\u304d\u63db\u3048\u306a\u3044\u305f\u3081\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3068\u3057\u3066\u751f\u307e\u308c\u305f\u3082\u306e\u3002\u305f\u3060\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3068\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u306e\u4e21\u9762\u304b\u3089\u4eca\u306f\u975e\u63a8\u5968\u3067\u3001React\u3067\u3082\u8b66\u544a\u306e\u5bfe\u8c61\u3067\u3059\u3002\u305d\u306e\u5834\u3067\u51e6\u7406\u3059\u308b\u306a\u3089button type=&#8221;button&#8221;\u3001\u9077\u79fb\u5148\u304c\u3042\u308b\u306a\u3089\u672c\u7269\u306eURL\uff0bpreventDefault\u3001\u3068\u899a\u3048\u3066\u304a\u3051\u3070\u8ff7\u3044\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u65b9\u3067\u3001\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u623b\u308a\u5024\u3092\u6368\u3066\u305f\u308a\u3001Promise\u3092\u3042\u3048\u3066\u5f85\u305f\u306a\u3044\u3053\u3068\u3092\u660e\u793a\u3057\u305f\u308a\u3068\u3001void\u6f14\u7b97\u5b50\u305d\u306e\u3082\u306e\u306f\u4eca\u3067\u3082\u73fe\u5f79\u3067\u3059\u3002\u899a\u3048\u65b9\u306f\u300cvoid\u304c\u51fa\u3066\u304d\u305f\u3089\u3001\u623b\u308a\u5024\u3092\u6368\u3066\u305f\u3044\u30b5\u30a4\u30f3\u300d\u3002\u300cVoid\u300d\u306f\u82f1\u8a9e\u3067\u300c\u7a7a\u3063\u307d\u300d\u3068\u3044\u3046\u610f\u5473\u306a\u306e\u3067\u3001\u7d50\u679c\u3092\u7a7a\u3063\u307d\u306b\u3059\u308b\u6f14\u7b97\u5b50\u3068\u8a18\u61b6\u3057\u3066\u304a\u3051\u3070\u3001\u305f\u3076\u3093\u305d\u3093\u306a\u306b\u30ba\u30ec\u3066\u306a\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ec\u30ac\u30b7\u30fc\u30b3\u30fc\u30c9\u306e\u6539\u4fee\u3067javascript:void(0)\u3092\u898b\u3064\u3051\u305f\u3089\u3001\u305c\u3072\u3053\u306e\u8a18\u4e8b\u3092\u601d\u3044\u51fa\u3057\u3066\u7f6e\u304d\u63db\u3048\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002JavaScript\u306e\u8a18\u6cd5\u307e\u308f\u308a\u3067\u306f\u3001\u300cJavaScript\u306e\u6587\u5b57\u5217\u3092\u30b9\u30c3\u30ad\u30ea\u8907\u6570\u884c\u3067\u66f8\u304f\u65b9\u6cd5\u3010\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30ea\u30c6\u30e9\u30eb\u3011\u300d\u3084\u300c\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u5185\u306b\u304a\u3051\u308b\u300c?\uff08\u306f\u3066\u306a\u30de\u30fc\u30af\uff09\u300d\u306e\u610f\u5473\u3068\u4f7f\u3044\u65b9\u3010JavaScript\u3011\u300d\u306e\u8a18\u4e8b\u3082\u66f8\u3044\u3066\u3044\u308b\u306e\u3067\u3001\u3042\u308f\u305b\u3066\u3069\u3046\u305e\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%80%90%E5%8F%82%E8%80%83%E6%96%87%E7%8C%AE%E3%80%91\"><\/span>\u3010\u53c2\u8003\u6587\u732e\u3011<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Operators\/void\" target=\"_blank\" rel=\"noopener\">void \u6f14\u7b97\u5b50 &#8211; JavaScript | MDN<\/a>\uff08https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Operators\/void\uff09<\/li>\n\n\n\n<li><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/undefined\" target=\"_blank\" rel=\"noopener\">undefined &#8211; JavaScript | MDN<\/a>\uff08https:\/\/developer.mozilla.org\/ja\/docs\/Web\/JavaScript\/Reference\/Global_Objects\/undefined\uff09<\/li>\n\n\n\n<li><a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/URI\/Reference\/Schemes\/javascript\" target=\"_blank\" rel=\"noopener\">javascript: URLs &#8211; URIs | MDN<\/a>\uff08https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/URI\/Reference\/Schemes\/javascript\uff09<\/li>\n\n\n\n<li><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/HTML\/Element\/a\" target=\"_blank\" rel=\"noopener\">&lt;a&gt;: \u30a2\u30f3\u30ab\u30fc\u8981\u7d20 &#8211; HTML | MDN<\/a>\uff08https:\/\/developer.mozilla.org\/ja\/docs\/Web\/HTML\/Element\/a\uff09<\/li>\n\n\n\n<li><a href=\"https:\/\/tc39.es\/ecma262\/multipage\/ecmascript-language-expressions.html#sec-void-operator\" target=\"_blank\" rel=\"noopener\">ECMAScript\u00ae Language Specification \u2014 The void Operator<\/a>\uff08https:\/\/tc39.es\/ecma262\/multipage\/ecmascript-language-expressions.html#sec-void-operator\uff09<\/li>\n\n\n\n<li><a href=\"https:\/\/ja.legacy.reactjs.org\/blog\/2019\/08\/08\/react-v16.9.0.html\" target=\"_blank\" rel=\"noopener\">React v16.9.0 and the Roadmap Update \u2013 React Blog<\/a>\uff08https:\/\/ja.legacy.reactjs.org\/blog\/2019\/08\/08\/react-v16.9.0.html\uff09<\/li>\n\n\n\n<li><a href=\"https:\/\/eslint.org\/docs\/rules\/no-void\" target=\"_blank\" rel=\"noopener\">no-void &#8211; ESLint<\/a>\uff08https:\/\/eslint.org\/docs\/rules\/no-void\uff09<\/li>\n\n\n\n<li><a href=\"https:\/\/typescript-eslint.io\/rules\/no-floating-promises\" target=\"_blank\" rel=\"noopener\">no-floating-promises | typescript-eslint<\/a>\uff08https:\/\/typescript-eslint.io\/rules\/no-floating-promises\uff09<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30ec\u30ac\u30b7\u30fc\u306a\u30b5\u30a4\u30c8\u306eHTML\u3092\u89e6\u3063\u3066\u3044\u308b\u3068\u3001&lt;a href=&#8221;javascript:void(0)&#8221;&gt;\u3068\u3044\u3046\u8b0e\u306e\u546a\u6587\u306b\u51fa\u304f\u308f\u3059\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3088\u306d\u3002\u30d3\u30eb\u30c9\u5f8c\u306e\u30df\u30cb\u30d5\u30a1\u30a4\u3055\u308c\u305fJS\u3092\u8997\u3044\u3066\u3082\u3001\u3084\u305f\u3089\u3068void 0\u304c 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