{"id":7559,"date":"2024-07-12T15:36:28","date_gmt":"2024-07-12T06:36:28","guid":{"rendered":"https:\/\/engineering.webstudio168.jp\/?p=7559"},"modified":"2024-10-27T01:14:25","modified_gmt":"2024-10-26T16:14:25","slug":"beforeunload","status":"publish","type":"post","link":"https:\/\/engineering.webstudio168.jp\/blog\/beforeunload\/","title":{"rendered":"\u30d6\u30e9\u30a6\u30b6\u306e\u66f4\u65b0\u30dc\u30bf\u30f3\u30af\u30ea\u30c3\u30af\/\u30d0\u30c3\u30af\/\u30da\u30fc\u30b8\u79fb\u52d5\u3092\u691c\u77e5\u3059\u308b\u65b9\u6cd5\u3010JavaScript\u3011"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u76ee\u6b21<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/beforeunload\/#beforeunload%E3%82%92%E4%BD%BF%E3%81%A3%E3%81%A6%E8%A7%A3%E6%B1%BA\" >beforeunload\u3092\u4f7f\u3063\u3066\u89e3\u6c7a<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/beforeunload\/#eventreturnValue%E3%81%AF%E9%9D%9E%E6%8E%A8%E5%A5%A8\" >event.returnValue\u306f\u975e\u63a8\u5968<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/beforeunload\/#return_false%E3%81%A7%E3%81%AF%E7%94%BB%E9%9D%A2%E9%81%B7%E7%A7%BB%E3%82%92%E9%98%B2%E3%81%92%E3%81%AA%E3%81%84\" >return false;\u3067\u306f\u753b\u9762\u9077\u79fb\u3092\u9632\u3052\u306a\u3044<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/beforeunload\/#%E6%9B%B4%E6%96%B0%E3%83%9C%E3%82%BF%E3%83%B3%E3%81%AE%E3%81%BF%E3%81%A7%E5%8B%95%E4%BD%9C%E3%81%95%E3%81%9B%E3%81%9F%E3%81%84%E5%A0%B4%E5%90%88\" >\u66f4\u65b0\u30dc\u30bf\u30f3\u306e\u307f\u3067\u52d5\u4f5c\u3055\u305b\u305f\u3044\u5834\u5408<\/a><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\">\u30d6\u30e9\u30a6\u30b6\u306e\u66f4\u65b0\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u305f\u6642\u306b\u306f\u3001\u901a\u5e38\u306f\u30da\u30fc\u30b8\u306e\u30ea\u30ed\u30fc\u30c9\u304c\u884c\u308f\u308c\u307e\u3059\u304c\u3001\u305d\u306e\u969b\u306b\u7279\u5b9a\u306e\u51e6\u7406\u3092\u884c\u3044\u305f\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u5909\u66f4\u304c\u4fdd\u5b58\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u306b\u78ba\u8a8d\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8868\u793a\u3057\u305f\u308a\u3001\u7279\u5b9a\u306e\u30c7\u30fc\u30bf\u3092\u30b5\u30fc\u30d0\u30fc\u306b\u9001\u4fe1\u3057\u305f\u308a\u7b49\u3005\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u66f4\u65b0\u30dc\u30bf\u30f3\u304c\u62bc\u3055\u308c\u305f\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u3001JavaScript\u3092\u5b9f\u884c\u3059\u308b\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u305f\u3060\u3057\u3001\u30e6\u30fc\u30b6\u30fc\u306b\u3068\u3063\u3066\u3046\u3056\u3063\u305f\u3044\u6319\u52d5\u306b\u306a\u308a\u304c\u3061\u306a\u306e\u3067\u3001\u305d\u306e\u70b9\u306f\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u4f55\u304b\u3057\u3089\u306e\u7ba1\u7406\u753b\u9762\u3067\u4f7f\u3046\u7b49\u306e\u5229\u7528\u306b\u7559\u3081\u308b\u3079\u304d\u3067\u3059\u3002\u50d5\u306e\u4ed5\u4e8b\u3067\u306fCMS\u306e\u7ba1\u7406\u753b\u9762\u306e\u30ea\u30cb\u30e5\u30fc\u30a2\u30eb\u3067\u4f7f\u7528\u3057\u307e\u3057\u305f\u3002\u30e6\u30fc\u30b6\u30d3\u30ea\u30c6\u30a3\u306e\u89b3\u70b9\u304b\u3089\u4e00\u822c\u306e\u30a6\u30a7\u30d6\u30da\u30fc\u30b8\u3067\u306f\u5229\u7528\u3057\u306a\u3044\u65b9\u304c\u826f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305f\u3001Wordpress\u306e\u30d7\u30e9\u30b0\u30a4\u30f3\u306a\u3069\u3067\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u6709\u52b9\u306b\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u5185\u5bb9\u306f\u767a\u706b\u3057\u306a\u3044\u3088\u3046\u306a\u306e\u3067\u6c17\u3092\u4ed8\u3051\u307e\u3057\u3087\u3046\u2026\u2026\uff08\u5b9f\u9a13\u6e08\u307f\uff09<a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/API\/Window\/beforeunload_event\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">iOS\u306eSafari\u3067\u306f\u51e6\u7406\u306b\u9650\u754c<\/a>\u304c\u3042\u308b\u3088\u3046\u3067\u3059\u2026\u2026<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"beforeunload%E3%82%92%E4%BD%BF%E3%81%A3%E3%81%A6%E8%A7%A3%E6%B1%BA\"><\/span>beforeunload\u3092\u4f7f\u3063\u3066\u89e3\u6c7a<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>beforeunload<\/code> \u30a4\u30d9\u30f3\u30c8\u306f\u3001\u30da\u30fc\u30b8\u304c<strong>\u30a2\u30f3\u30ed\u30fc\u30c9\uff08unload\uff09<\/strong>\u3055\u308c\u308b\u76f4\u524d\u306b\u767a\u751f\u3057\u3001\u30da\u30fc\u30b8\u306e\u66f4\u65b0\u6642\u306b\u3082\u767a\u706b\u3057\u307e\u3059\u3002\u6b21\u306e\u3088\u3046\u306bJavaScript\u3092\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-js\" data-lang=\"JavaScript\" data-show-lang=\"1\"><code>window.addEventListener(&#39;beforeunload&#39;, function (event) {\n});<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">jQuery\u3092\u5229\u7528\u3059\u308b\u5834\u5408\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-js\" data-lang=\"JavaScript\"><code>$(window).on(&#39;beforeunload&#39;, function (event) {\n});<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u30a2\u30f3\u30ed\u30fc\u30c9<\/strong>\u3068\u3044\u3046\u306e\u306f\u300c\u30d6\u30e9\u30a6\u30b6\u304c\u73fe\u5728\u306e\u30da\u30fc\u30b8\u3092\u96e2\u308c\u308b\u300d\u3068\u3044\u3046\u610f\u5473\u3067\u4f7f\u308f\u308c\u308b\u306e\u3067\u3001<strong>\u5fc5\u305a\u3057\u3082\u66f4\u65b0\u30dc\u30bf\u30f3\u304c\u62bc\u3055\u308c\u305f\u30bf\u30a4\u30df\u30f3\u30b0\u3092\u691c\u77e5\u3059\u308b\u308f\u3051\u3067\u306f\u306a\u3044<\/strong>\u3053\u3068\u306b\u6ce8\u610f\u3067\u3059\u3002\u5177\u4f53\u7684\u306a\u30b7\u30fc\u30f3\u3068\u3057\u3066\u306f\u300c\u30da\u30fc\u30b8\u306e\u66f4\u65b0\u300d\u300c\u65b0\u3057\u3044\u30da\u30fc\u30b8\u3078\u306e\u79fb\u52d5\u300d\u300c\u30d6\u30e9\u30a6\u30b6\u306e\u30bf\u30d6\u3092\u9589\u3058\u308b\u300d\u306e\u30d1\u30bf\u30fc\u30f3\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>beforeunload<\/code> \u30a4\u30d9\u30f3\u30c8\u306f\u3001\u30da\u30fc\u30b8\u304c\u4e0a\u8a18\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u30a2\u30f3\u30ed\u30fc\u30c9\u3055\u308c\u308b\u76f4\u524d\u306b\u5b9f\u884c\u3057\u305f\u3044\u51e6\u7406\u3092\u8a18\u8ff0\u3059\u308b\u305f\u3081\u306b\u5229\u7528\u3057\u307e\u3059\u306e\u3067\u7559\u610f\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8a71\u3092\u3082\u3069\u3057\u3066\u3001\u4e0a\u8a18\u306e\u30b5\u30f3\u30d7\u30eb\u3067\u4f55\u3089\u304b\u306e\u51e6\u7406\u3092\u8ffd\u52a0\u3057\u305f\u3044\u5834\u5408\u306f<code>preventDefault()<\/code>\u3067\u4e00\u65e6\u30a2\u30f3\u30ed\u30fc\u30c9\u3092\u6b62\u3081\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<code>preventDefault()<\/code>\u3092\u5165\u308c\u306a\u3044\u3068\u305d\u306e\u307e\u307e\u30a2\u30f3\u30ed\u30fc\u30c9\u304c\u9032\u884c\u3057\u3066\u601d\u3046\u3088\u3046\u306a\u6319\u52d5\u306b\u306a\u3089\u306a\u3044\u306e\u3067\u8981\u30c1\u30a7\u30c3\u30af\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-plain\"><code>window.addEventListener(&#39;beforeunload&#39;, function (event) {\n  event.preventDefault(); \/\/ \u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u52d5\u4f5c\uff08\u30a2\u30f3\u30ed\u30fc\u30c9\uff09\u306e\u9032\u884c\u3092\u6b62\u3081\u308b\n  \/\/ \u4ee5\u964d\u3001\u5b9f\u884c\u3057\u305f\u3044\u51e6\u7406\n});<\/code><\/pre><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"eventreturnValue%E3%81%AF%E9%9D%9E%E6%8E%A8%E5%A5%A8\"><\/span>event.returnValue\u306f\u975e\u63a8\u5968<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u53e4\u3044\u30a6\u30a7\u30d6\u30da\u30fc\u30b8\u306b\u3088\u3063\u3066\u306f\uff08\u6bd4\u8f03\u7684\u65b0\u3057\u3044\u8a18\u4e8b\u3067\u3082\u2026\u2026\uff09<code>event.returnValue = '\u8868\u793a\u3055\u305b\u305f\u3044\u6587\u5b57'<\/code>\u3092\u5b9f\u88c5\u4f8b\u3067\u6319\u3052\u3066\u3044\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u3053\u3061\u3089\u306f\u975e\u63a8\u5968\u3067Web\u6a19\u6e96\u3067\u306f\u306a\u304f\u306a\u3063\u3066\u3044\u307e\u3059\uff08<a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/API\/Event\/returnValue\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">mdn web_docs<\/a>\uff09\u3002\u5b9f\u969b\u306b2024\u5e747\u6708\u73fe\u5728\u3001Google Chrome\uff08ver.126.0.6478.127\uff09\u3067\u306f\u52d5\u4f5c\u305b\u305a\u3001\u30d6\u30e9\u30a6\u30b6\u6a19\u6e96\u306e\u6587\u5b57\u5217\u3057\u304b\u8868\u793a\u3055\u308c\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"786\" height=\"299\" src=\"https:\/\/engineering.webstudio168.jp\/blog\/wp-content\/uploads\/2024\/07\/\u30ad\u30e3\u30d7\u30c1\u30e3.png\" alt=\"\" class=\"wp-image-7625\" srcset=\"https:\/\/engineering.webstudio168.jp\/blog\/wp-content\/uploads\/2024\/07\/\u30ad\u30e3\u30d7\u30c1\u30e3.png 786w, https:\/\/engineering.webstudio168.jp\/blog\/wp-content\/uploads\/2024\/07\/\u30ad\u30e3\u30d7\u30c1\u30e3-300x114.png 300w, https:\/\/engineering.webstudio168.jp\/blog\/wp-content\/uploads\/2024\/07\/\u30ad\u30e3\u30d7\u30c1\u30e3-768x292.png 768w\" sizes=\"auto, (max-width: 786px) 100vw, 786px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"return_false%E3%81%A7%E3%81%AF%E7%94%BB%E9%9D%A2%E9%81%B7%E7%A7%BB%E3%82%92%E9%98%B2%E3%81%92%E3%81%AA%E3%81%84\"><\/span>return false;\u3067\u306f\u753b\u9762\u9077\u79fb\u3092\u9632\u3052\u306a\u3044<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>beforeunload<\/code>\u30a4\u30d9\u30f3\u30c8\u306e\u6700\u5f8c\u306b<code>return false;<\/code>\u3092\u8ffd\u52a0\u3059\u308b\u3068\u753b\u9762\u9077\u79fb\u3084\u66f4\u65b0\u3092\u9632\u3050\u3053\u3068\u304c\u51fa\u6765\u305d\u3046\u3067\u3059\u304c\u3001\u30d6\u30e9\u30a6\u30b6\u306e\u4ed5\u69d8\u306b\u3088\u308a\u3053\u306e\u6319\u52d5\u306f\u4e0d\u53ef\u3067\u3059\u3002\u73fe\u72b6\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u306f<code>confirm<\/code>\u3082\u52d5\u4f5c\u3057\u307e\u305b\u3093\u3002\u306a\u306e\u3067\u9077\u79fb\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u5c0b\u306d\u308b\u30c0\u30a4\u30a2\u30ed\u30b0\u306f\u30d6\u30e9\u30a6\u30b6\u6a19\u6e96\u306e\u307f\u306e\u5229\u7528\u306b\u306a\u308b\u3068\u8003\u3048\u305f\u65b9\u304c\u826f\u3044\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%9B%B4%E6%96%B0%E3%83%9C%E3%82%BF%E3%83%B3%E3%81%AE%E3%81%BF%E3%81%A7%E5%8B%95%E4%BD%9C%E3%81%95%E3%81%9B%E3%81%9F%E3%81%84%E5%A0%B4%E5%90%88\"><\/span>\u66f4\u65b0\u30dc\u30bf\u30f3\u306e\u307f\u3067\u52d5\u4f5c\u3055\u305b\u305f\u3044\u5834\u5408<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>beforeunload<\/code> \u30a4\u30d9\u30f3\u30c8\u306f\u3001\u66f4\u65b0\u3001\u753b\u9762\u9077\u79fb\u3001\u30bf\u30d6\u306e\u7d42\u4e86\u306a\u3069\u30a2\u30f3\u30ed\u30fc\u30c9\uff08unload\uff09\u3055\u308c\u308b\u76f4\u524d\u3059\u3079\u3066\u306b\u9069\u7528\u3055\u308c\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3082\u3057\u3069\u3046\u3057\u3066\u3082\u53b3\u5bc6\u306b\u66f4\u65b0\u30dc\u30bf\u30f3\u306e\u307f\u3092\u691c\u77e5\u3057\u305f\u3044\u5834\u5408\u306f\u4ee5\u4e0b\u306e\u69d8\u306b\u30d6\u30e9\u30a6\u30b6\u306e\u30ca\u30d3\u30b2\u30fc\u30b7\u30e7\u30f3\u60c5\u5831\u3092\u53d6\u5f97\u3057\u3066\u5206\u5c90\u3055\u305b\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-plain\"><code>window.addEventListener(&#39;beforeunload&#39;, function (event) {\n  event.preventDefault();\n  let navType = window?.performance?.getEntriesByType(&quot;navigation&quot;)[0]?.type;\n  if (navType === &#39;reload&#39;) { \/\/ \u3082\u3061\u308d\u3093switch\u6587\u3067\u3082\u53ef\u3067\u3059\n    console.log(&#39;\u66f4\u65b0\u3055\u308c\u307e\u3059\u3088&#39;);\n  }\n});<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><code>window?<\/code>\u3084<code>performance?<\/code>\u304c\u5fae\u5999\u306b\u5206\u304b\u3089\u306a\u3044\u65b9\u3082\u3044\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u306e\u3067\u7c21\u5358\u306b\u8aac\u660e\u3057\u307e\u3059\u3002\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u76f4\u5f8c\u306e\u300c?\u300d\u306f<strong>\u30aa\u30d7\u30b7\u30e7\u30ca\u30eb\u30c1\u30a7\u30a4\u30cb\u30f3\u30b0\u6f14\u7b97\u5b50<\/strong>\u3068\u8a00\u3063\u3066\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3084\u30e1\u30bd\u30c3\u30c9\u306b\u5b89\u5168\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u305f\u3081\u306e\u6f14\u7b97\u5b50\u3067\u3059\u3002\u3082\u3057\u5de6\u5074\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c <code>null<\/code> \u307e\u305f\u306f <code>undefined<\/code> \u306e\u5834\u5408\u3001\u53f3\u5074\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u30a2\u30af\u30bb\u30b9\u3084\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u3092\u8a66\u307f\u305a\u306b <code>undefined<\/code> \u3092\u8fd4\u3057\u307e\u3059\u3002JavaScript\u306e\u69cb\u6587\u30a8\u30e9\u30fc\u3092\u9632\u3050\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u5fdc\u30ca\u30d3\u30b2\u30fc\u30b7\u30e7\u30f3\u30bf\u30a4\u30d7\u306e\u5bfe\u5fdc\u8868\u3092\u63b2\u8f09\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><tbody><tr><td>navigate<\/td><td>\u30da\u30fc\u30b8\u304c\u901a\u5e38\u306e\u30ca\u30d3\u30b2\u30fc\u30b7\u30e7\u30f3\uff08\u30ea\u30f3\u30af\u30af\u30ea\u30c3\u30af\u306a\u3069\uff09\u306b\u3088\u3063\u3066\u8aad\u307f\u8fbc\u307e\u308c\u305f\u5834\u5408<\/td><\/tr><tr><td>reload<\/td><td>\u30da\u30fc\u30b8\u304c\u30d6\u30e9\u30a6\u30b6\u306e\u66f4\u65b0\u30dc\u30bf\u30f3\u3084 <code>location.reload()<\/code> \u30e1\u30bd\u30c3\u30c9\u306b\u3088\u3063\u3066\u518d\u8aad\u307f\u8fbc\u307f\u3055\u308c\u305f\u5834\u5408<\/td><\/tr><tr><td>back_forward<\/td><td>\u30d6\u30e9\u30a6\u30b6\u306e\u623b\u308b\u3084\u9032\u3080\u30dc\u30bf\u30f3\u306b\u3088\u3063\u3066\u79fb\u52d5\u3057\u305f\u5834\u5408<\/td><\/tr><tr><td>prerender<\/td><td>\u30da\u30fc\u30b8\u304c\u30d7\u30ea\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u305f\u5f8c\u3001\u5b9f\u969b\u306b\u30e6\u30fc\u30b6\u30fc\u306b\u8868\u793a\u3055\u308c\u305f\u5834\u5408<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">.getEntriesByType(&#8220;navigation&#8221;)[0]?.type\u3067\u53d6\u5f97\u3067\u304d\u308b\u5024<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u3088\u3063\u307d\u3069\u306e\u4e8b\u60c5\u304c\u306a\u3044\u9650\u308a<code>beforeunload<\/code>\u306f\u5229\u7528\u3057\u306a\u3044\u3068\u306f\u601d\u3044\u307e\u3059\u304c\u3001\u3082\u3057\u30da\u30fc\u30b8\u306e\u96e2\u8131\u3084\u8a2d\u5b9a\u306e\u4fdd\u5b58\u72b6\u614b\u3092\u78ba\u8a8d\u3057\u305f\u3044\u5834\u5408\u306a\u3069\u306b\u4f7f\u3048\u308b\u306e\u3067\u662f\u975e\u8a18\u61b6\u306b\u3068\u3069\u3081\u3066\u304a\u304f\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30d6\u30e9\u30a6\u30b6\u306e\u66f4\u65b0\u30dc\u30bf\u30f3\u304c\u30af\u30ea\u30c3\u30af\u3055\u308c\u305f\u6642\u306b\u306f\u3001\u901a\u5e38\u306f\u30da\u30fc\u30b8\u306e\u30ea\u30ed\u30fc\u30c9\u304c\u884c\u308f\u308c\u307e\u3059\u304c\u3001\u305d\u306e\u969b\u306b\u7279\u5b9a\u306e\u51e6\u7406\u3092\u884c\u3044\u305f\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u5909\u66f4\u304c\u4fdd\u5b58\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u306b\u78ba\u8a8d\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u8868\u793a\u3057\u305f\u308a\u3001\u7279\u5b9a\u306e\u30c7\u30fc\u30bf\u3092\u30b5\u30fc\u30d0\u30fc\u306b\u9001\u4fe1\u3057 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7642,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[55],"tags":[8,48],"class_list":["post-7559","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\/7559","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=7559"}],"version-history":[{"count":53,"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/posts\/7559\/revisions"}],"predecessor-version":[{"id":7749,"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/posts\/7559\/revisions\/7749"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/media\/7642"}],"wp:attachment":[{"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/media?parent=7559"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/categories?post=7559"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/engineering.webstudio168.jp\/blog\/wp-json\/wp\/v2\/tags?post=7559"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}