{"id":17861,"date":"2026-05-19T00:00:00","date_gmt":"2026-05-18T15:00:00","guid":{"rendered":"https:\/\/nxpg.net\/blog\/tech\/?p=17861"},"modified":"2026-06-18T18:16:37","modified_gmt":"2026-06-18T09:16:37","slug":"sessionstorage%e3%81%a7%e7%b9%b0%e3%82%8a%e8%bf%94%e3%81%95%e3%81%aa%e3%81%84%e3%83%ad%e3%83%bc%e3%83%87%e3%82%a3%e3%83%b3%e3%82%b0%e3%82%a4%e3%83%99%e3%83%b3%e3%83%88%e3%82%92%e4%bd%9c%e3%82%8d","status":"publish","type":"post","link":"https:\/\/nxpg.net\/blog\/tech\/?p=17861","title":{"rendered":"sessionStorage\u3067\u7e70\u308a\u8fd4\u3055\u306a\u3044\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u30a4\u30d9\u30f3\u30c8\u3092\u4f5c\u308d\u3046\uff01"},"content":{"rendered":"<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"960\" height=\"540\" src=\"https:\/\/nxpg.net\/blog\/tech\/wp-content\/uploads\/sites\/7\/thumbnail20260618.jpg\" 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class=\"wp-block-heading\">\u5b9f\u88c5\u306e\u6d41\u308c<\/h2>\n\n\n\n<p>\u6d41\u308c\u3068\u3057\u3066\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u8003\u3048\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u2460 \u521d\u56de\u30a2\u30af\u30bb\u30b9\u304b\u78ba\u8a8d<br>\u2461 \u521d\u56de\u306a\u3089\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u8868\u793a<br>\u2462 \u8868\u793a\u6e08\u307f\u30d5\u30e9\u30b0\u3092\u4fdd\u5b58<br>\u2463 2\u56de\u76ee\u4ee5\u964d\u306f\u30b9\u30ad\u30c3\u30d7<\/p>\n\n\n\n<p>\u3067\u306f\u3001\u5b9f\u969b\u306b\u3069\u3046\u3044\u3063\u305f\u51e6\u7406\u306b\u306a\u308b\u306e\u304b\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5177\u4f53\u7684\u306a\u5b9f\u88c5\u4f8b<\/h2>\n\n\n\n<p>\u4eca\u56de\u306f\u3001loading\u3068\u3044\u3046id\u3092\u3082\u3064div\u306b.is_loaded\u30af\u30e9\u30b9\u3092\u4ed8\u4e0e\u3059\u308b\u51e6\u7406\u3092\u8003\u3048\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305a\u306fHTML\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;div id=\"loading\"&gt;&lt;\/div&gt;<\/code><\/pre>\n\n\n\n<p>\u4e2d\u8eab\u3084\u307b\u304b\u306e\u90e8\u5206\u306f\u5272\u611b\u3057\u3066\u3044\u307e\u3059\u3002<br>\u307e\u305f\u3001CSS\u306b\u3064\u3044\u3066\u3082\u51e6\u7406\u3068\u76f4\u63a5\u95a2\u4fc2\u3057\u306a\u3044\u305f\u3081\u7701\u7565\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u51e6\u7406\u306e\u30e1\u30a4\u30f3\u3067\u3042\u308bJS\u306f\u4ee5\u4e0b\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>window.addEventListener(\"load\", () =&gt; {\n  const loading = document.getElementById(\"loading\");\n  \/\/ \u2460 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\u521d\u56de\u30a2\u30af\u30bb\u30b9\u304b\u78ba\u8a8d<\/h3>\n\n\n\n<p>sessionStorage\u306b\u5bfe\u3057\u3066getItem()\u3067visited\u30ad\u30fc\u306e\u5024\u3092\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002\u3000visited\u30ad\u30fc\u304c\u306a\u3044\u5834\u5408null\u304c\u8fd4\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>getItem()\u306b\u3064\u3044\u3066\u306fMDN\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<br><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/API\/Storage\/getItem\" target=\"_blank\" rel=\"noopener\" title=\"\">https:\/\/developer.mozilla.org\/ja\/docs\/Web\/API\/Storage\/getItem<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u2461 \u521d\u56de\u306a\u3089\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u8868\u793a<\/h3>\n\n\n\n<p>\u30b7\u30f3\u30d7\u30eb\u306aif\u6587\u3067\u3059\u3002\u3000isVisited\u304cnull\uff1dvisited\u30ad\u30fc\u304c\u306a\u3044\uff1d\u521d\u56de\u8a2a\u554f\u306e\u3068\u304d\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3 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