{"id":7534,"date":"2024-07-04T16:26:07","date_gmt":"2024-07-04T07:26:07","guid":{"rendered":"https:\/\/engineering.webstudio168.jp\/?p=7534"},"modified":"2024-09-05T01:13:57","modified_gmt":"2024-09-04T16:13:57","slug":"mutationobserver","status":"publish","type":"post","link":"https:\/\/engineering.webstudio168.jp\/blog\/mutationobserver\/","title":{"rendered":"DOM\uff08\u8981\u7d20\uff09\u306e\u5909\u66f4\u3084\u66f4\u65b0\u3092\u691c\u77e5\u3059\u308b\u30d9\u30b9\u30c8\u306a\u65b9\u6cd5\u301cMutationObserver API\u306e\u4f7f\u3044\u65b9\u3010JavaScript\u30ac\u30a4\u30c9\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\/mutationobserver\/#DOM%E3%81%AE%E5%A4%89%E6%9B%B4%EF%BC%88%E8%BF%BD%E5%8A%A0%E5%89%8A%E9%99%A4%E3%82%AF%E3%83%A9%E3%82%B9%E3%81%AE%E4%BB%98%E4%B8%8E%E3%81%AA%E3%81%A9%EF%BC%89%E3%82%92%E6%A4%9C%E7%9F%A5%E3%81%97%E3%81%9F%E3%81%84%EF%BC%81\" >DOM\u306e\u5909\u66f4\uff08\u8ffd\u52a0\/\u524a\u9664\/\u30af\u30e9\u30b9\u306e\u4ed8\u4e0e\u306a\u3069\uff09\u3092\u691c\u77e5\u3057\u305f\u3044\uff01<\/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\/mutationobserver\/#MutationObserver_API%E3%81%A8%E3%81%AF%EF%BC%9F\" >MutationObserver API\u3068\u306f\uff1f<\/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\/mutationobserver\/#%E5%9F%BA%E6%9C%AC%E7%9A%84%E3%81%AA%E4%BD%BF%E3%81%84%E6%96%B9\" >\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/mutationobserver\/#%E7%9B%A3%E8%A6%96%E3%81%99%E3%82%8B%E5%A4%89%E6%9B%B4%E3%81%AE%E7%A8%AE%E9%A1%9E%EF%BC%88config%EF%BC%89%E3%81%AB%E3%81%A4%E3%81%84%E3%81%A6\" >\u76e3\u8996\u3059\u308b\u5909\u66f4\u306e\u7a2e\u985e\uff08config\uff09\u306b\u3064\u3044\u3066<\/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\/mutationobserver\/#attributes%EF%BC%88%E5%BF%85%E9%A0%88%EF%BC%89\" >attributes\uff08\u5fc5\u9808\uff09<\/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\/mutationobserver\/#childList%EF%BC%88%E5%BF%85%E9%A0%88%EF%BC%89\" >childList\uff08\u5fc5\u9808\uff09<\/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\/mutationobserver\/#subtree%EF%BC%88%E5%BF%85%E9%A0%88%EF%BC%89\" >subtree\uff08\u5fc5\u9808\uff09<\/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\/mutationobserver\/#attributeFilter\" >attributeFilter<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/mutationobserver\/#attributeOldValue\" >attributeOldValue<\/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\/mutationobserver\/#characterData\" >characterData<\/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\/mutationobserver\/#characterDataOldValue\" >characterDataOldValue<\/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\/mutationobserver\/#%E5%85%B7%E4%BD%93%E7%9A%84%E3%81%AA%E7%94%A8%E6%B3%95%E3%81%A8MutationObserver%E3%81%AE%E6%B3%A8%E6%84%8F%E7%82%B9\" >\u5177\u4f53\u7684\u306a\u7528\u6cd5\u3068MutationObserver\u306e\u6ce8\u610f\u70b9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/mutationobserver\/#%E3%81%BE%E3%81%A8%E3%82%81\" >\u307e\u3068\u3081<\/a><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\">\u6700\u8fd1\u3001\u4ed5\u4e8b\u3067DOM\u304c\u5909\u66f4\u3055\u308c\u305f\u3068\u304d\u306b\u30b3\u30fc\u30c9\u3092\u767a\u706b\u3057\u305f\u3044\u5834\u9762\u304c\u591a\u304f\u3001\u30af\u30ea\u30c3\u30af\u6642\u3084ajax\u3067\u5185\u5bb9\u306e\u66f4\u65b0\u306a\u3069\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u305d\u306e\u90fd\u5ea6\u4f3c\u305f\u3088\u3046\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u4ed5\u8fbc\u3080\u306e\u304c\u9762\u5012\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3057\u305f\u3002<br>\u7279\u306b\u5927\u91cf\u306eiframe\u3092\u6271\u3046\u5fc5\u8981\u304c\u3042\u3063\u305f\u306e\u3067\u30011\u30f6\u6240\uff11\u30f6\u6240\u306b\u30b3\u30fc\u30c9\u3092\u8ffd\u8a18\u3059\u308b\u306e\u304c\u975e\u5e38\u306b\u52b9\u7387\u304c\u60aa\u304f\u3001\u30e1\u30f3\u30c6\u3082\u5104\u52ab\u306b\u306a\u308b\u3053\u3068\u9593\u9055\u3044\u306a\u3057\u3067\u3059\u3002\u305d\u3053\u3067\u3001\u5927\u67a0\u306e\u30da\u30fc\u30b8\u306bDOM\u3092\u76e3\u8996\u3055\u305b\u3066\u3001\u5909\u66f4\u3084\u66f4\u65b0\u304c\u3042\u3063\u305f\u3089\u90fd\u5ea6\u81ea\u52d5\u7684\u306b\u5b9f\u884c\u3059\u308b\u3088\u3046\u306a\u624b\u6cd5\u3092\u63a1\u308b\u3053\u3068\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">UI\u304c\u30a4\u30f3\u30bf\u30e9\u30af\u30c6\u30a3\u30d6\u306b\u306a\u308b\u307b\u3069\u3001DOM\u306e\u66f4\u65b0\u304c\u983b\u7e41\u306b\u884c\u308f\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002MutationObserver API\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001<strong>\u30d6\u30e9\u30a6\u30b6\u304c\u63d0\u4f9b\u3059\u308b\u30cd\u30a4\u30c6\u30a3\u30d6\u306a\u30a4\u30d9\u30f3\u30c8\u3092\u5229\u7528\u3057\u3066<\/strong>\u52b9\u7387\u7684\u306b<strong>DOM\u306e\u5909\u66f4\u3092\u76e3\u8996<\/strong>\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u304a\u305d\u3089\u304f\u8131\u4e2d\u7d1a\u8005\u306e\u5185\u5bb9\u306b\u306a\u308a\u307e\u3059\u306e\u3067\u3057\u3063\u304b\u308a\u5bfe\u5fdc\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u304a\u304f\u3053\u3068\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"DOM%E3%81%AE%E5%A4%89%E6%9B%B4%EF%BC%88%E8%BF%BD%E5%8A%A0%E5%89%8A%E9%99%A4%E3%82%AF%E3%83%A9%E3%82%B9%E3%81%AE%E4%BB%98%E4%B8%8E%E3%81%AA%E3%81%A9%EF%BC%89%E3%82%92%E6%A4%9C%E7%9F%A5%E3%81%97%E3%81%9F%E3%81%84%EF%BC%81\"><\/span>DOM\u306e\u5909\u66f4\uff08\u8ffd\u52a0\/\u524a\u9664\/\u30af\u30e9\u30b9\u306e\u4ed8\u4e0e\u306a\u3069\uff09\u3092\u691c\u77e5\u3057\u305f\u3044\uff01<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u7279\u5b9a\u306e&lt;div&gt;\u306b\u65b0\u305f\u306b&lt;div&gt;\u304c\u8ffd\u52a0\u3055\u308c\u305f\u3068\u304d\u3084\u305d\u306e&lt;div&gt;\u306bclass\u304c\u8ffd\u52a0\u3055\u308c\u305f\u308a\u524a\u9664\u3055\u308c\u305f\u308a\u3057\u305f\u5834\u5408\u306bJS\u3092\u767a\u706b\u3055\u305b\u305f\u3044\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u4f7f\u308f\u306a\u3044\u5834\u5408\u306f\u7279\u306b\u610f\u8b58\u7684\u306b\u8a18\u8ff0\u3057\u3066\u3044\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u306d\u3002\u305d\u3053\u3067\u4fbf\u5229\u306a\u306e\u304c\u3001\u30d6\u30e9\u30a6\u30b6\u6a19\u6e96\u306eMutationObserver API\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"MutationObserver_API%E3%81%A8%E3%81%AF%EF%BC%9F\"><\/span>MutationObserver API\u3068\u306f\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">MutationObserver API\u306f\u3001\u30a6\u30a7\u30d6\u30d6\u30e9\u30a6\u30b6\u306eJavaScript\u74b0\u5883\u3067DOM\u306e\u5909\u66f4\u3092\u76e3\u8996\u3059\u308b\u305f\u3081\u306e\u30cd\u30a4\u30c6\u30a3\u30d6\u306a\u6a5f\u80fd\u3067\u3059\u3002\u3053\u306eAPI\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001<strong>DOM\u306e\u7279\u5b9a\u306e\u90e8\u5206\u306b\u5bfe\u3059\u308b\u5909\u66f4\u3092\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u3067\u691c\u77e5\u3057\u3001\u5fc5\u8981\u306a\u51e6\u7406\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059<\/strong>\u3002\u5f93\u6765\u3001DOM\u306e\u5909\u66f4\u3092\u691c\u77e5\u3059\u308b\u305f\u3081\u306b\u3001\u5b9a\u671f\u7684\u306bDOM\u3092\u30dd\u30fc\u30ea\u30f3\u30b0\uff08setInterval\u3084setTimeout\u306a\u3069\u3067\u4e00\u5b9a\u6642\u9593\u3067\u7e70\u308a\u8fd4\u3057\u76e3\u8996\uff09\u3059\u308b\u65b9\u6cd5\u3082\u3042\u308a\u307e\u3057\u305f\u304c\u3001MutationObserver API\u306f\u3053\u308c\u3092\u52b9\u7387\u7684\u306b\u89e3\u6c7a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MutationObserver\u306f\u3001<strong>\u76e3\u8996\u5bfe\u8c61\u306e\u30ce\u30fc\u30c9<\/strong>\u3068<strong>\u5909\u66f4\u306e\u7a2e\u985e<\/strong>\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001DOM\u306b\u5bfe\u3059\u308b\u3042\u3089\u3086\u308b\u5909\u66f4\u3092\u30ad\u30e3\u30d7\u30c1\u30e3\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001UI\u306e\u52d5\u7684\u306a\u66f4\u65b0\u3084\u30e6\u30fc\u30b6\u30fc\u30a4\u30f3\u30bf\u30e9\u30af\u30b7\u30e7\u30f3\u306b\u5373\u5ea7\u306b\u5bfe\u5fdc\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%9F%BA%E6%9C%AC%E7%9A%84%E3%81%AA%E4%BD%BF%E3%81%84%E6%96%B9\"><\/span>\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">MutationObserver API\u3092\u5229\u7528\u3059\u308b\u969b\u306e\u304a\u304a\u307e\u304b\u306a\u6d41\u308c\u306f\u4ee5\u4e0b\u306e\u69d8\u306b\u306a\u308a\u307e\u3059\u3002\uff08\u3081\u3061\u3083\u304f\u3061\u3083\u7c21\u5358\u2026\u2026\uff09<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>MutationObserver\u306e\u4f5c\u6210<\/li>\n\n\n\n<li>\u76e3\u8996\u5bfe\u8c61\u306e\u6307\u5b9a\u3068\u5b9f\u884c<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305a\u30011.\u306e\u4f5c\u6210\u3067\u3059\u304c\u3001\u5177\u4f53\u7684\u306b\u306f\u4ee5\u4e0b\u306e\u69d8\u306a\u30b3\u30fc\u30c9\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\" data-show-lang=\"1\"><code>const observer = new MutationObserver((mutations) =&gt; { \/* 1.\u4f5c\u6210 *\/\n  mutations.forEach((mutation) =&gt; {\n    \/\/ \u3053\u3053\u306b\u5b9f\u884c\u3059\u308b\u5185\u5bb9\u3092\u8a18\u8f09\n    console.log(mutation);\n  });\n});<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><code>observer<\/code>\u3068\u3044\u3046\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067MutationObserver\u3092\u65b0\u898f\u4f5c\u6210\u3057\u3066\u3044\u308b\u3060\u3051\u3067\u3059\u306d\u3002<br><code>mutations<\/code>\u3068\u3042\u308a\u307e\u3059\u304c\u3001\u3053\u308c\u306f\u300c<strong>\u691c\u51fa\u3055\u308c\u305f\u5909\u66f4\u3092\u30ea\u30b9\u30c8\u72b6\u306b\u3057\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/strong>\u300d\u306b\u306a\u308a\u307e\u3059\u3002\u30ea\u30b9\u30c8\u72b6\u306a\u306e\u3067<code>forEach<\/code>\u3067\u56de\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2.\u306b\u3064\u3044\u3066\u306f\u8a2d\u5b9a\u3068\u5b9f\u884c\u3092\u4ee5\u4e0b\u306e\u69d8\u306b\u884c\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\" data-show-lang=\"1\"><code>const targetNode = document.getElementById(&#39;target&#39;);\nconst config = { attributes: true, childList: true, subtree: true }; \/* 2.\u8a2d\u5b9a\u5024\u6307\u5b9a *\/\nobserver.observe(targetNode, config);\u3000\/* 2.\u8a2d\u5b9a\u30fb\u5b9f\u884c *\/<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">MutationObserver\u3092\u4f7f\u7528\u3059\u308b\u969b\u3001<code>observe<\/code>\u30e1\u30bd\u30c3\u30c9\u306b\u6e21\u3059<code>config<\/code>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u76e3\u8996\u3059\u308b\u5909\u66f4\u306e\u7a2e\u985e\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<a href=\"#config\"><code>config<\/code>\u306b\u3064\u3044\u3066\u8a73\u7d30\u306f\u5f8c\u8ff0<\/a>\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>MutationObserver\u30aa\u30d6\u30b8\u30a7\u30af\u30c8.observe(\u30bf\u30fc\u30b2\u30c3\u30c8\u306eDOM\u8981\u7d20, \u76e3\u8996\u5bfe\u8c61\u306e\u7a2e\u985e);<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3068\u3044\u3046\u3088\u3046\u306b\u899a\u3048\u3066\u304a\u304f\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002\u975e\u5e38\u306b\u7c21\u6f54\u306b\u8a18\u8ff0\u3067\u304d\u3066\u4fbf\u5229\u3067\u3059\u306d\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"config\"><span class=\"ez-toc-section\" id=\"%E7%9B%A3%E8%A6%96%E3%81%99%E3%82%8B%E5%A4%89%E6%9B%B4%E3%81%AE%E7%A8%AE%E9%A1%9E%EF%BC%88config%EF%BC%89%E3%81%AB%E3%81%A4%E3%81%84%E3%81%A6\"><\/span>\u76e3\u8996\u3059\u308b\u5909\u66f4\u306e\u7a2e\u985e\uff08config\uff09\u306b\u3064\u3044\u3066<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">observe\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u884c\u3059\u308b\u969b\u306b\u3001\u76e3\u8996\u5bfe\u8c61\u306e\u8981\u7d20\u306b\u52a0\u3048\u3001\u76e3\u8996\u3059\u308b\u5909\u66f4\u306e\u7a2e\u985e\u3092\u5f15\u6570\u3068\u3057\u3066\u6e21\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3068\u3044\u3044\u307e\u3057\u305f\u304c\u3001\u5177\u4f53\u7684\u306b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u6307\u5b9a\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8981\u7d20\u306b\u65b0\u3057\u3044\u30af\u30e9\u30b9\u304c\u8ffd\u52a0\u3055\u308c\u305f\u308a\u3001\u65e2\u5b58\u306e\u30af\u30e9\u30b9\u304c\u5909\u66f4\u3055\u308c\u305f\u308a\u3057\u305f\u5834\u5408\u306a\u3069<\/li>\n\n\n\n<li>\u65b0\u3057\u3044\u5b50\u8981\u7d20\u304c\u8ffd\u52a0\u3055\u308c\u305f\u308a\u3001\u65e2\u5b58\u306e\u5b50\u8981\u7d20\u304c\u524a\u9664\u3055\u308c\u305f\u308a\u3057\u305f\u5834\u5408<\/li>\n\n\n\n<li>\u76e3\u8996\u5bfe\u8c61\u306e\u8981\u7d20\u5185\u90e8\u3067\u884c\u308f\u308c\u308b\u3059\u3079\u3066\u306eDOM\u5909\u66f4\u3092\u691c\u77e5\u3057\u305f\u3044\u5834\u5408<\/li>\n\n\n\n<li><code>class<\/code>\u5c5e\u6027\u3084<code>style<\/code>\u5c5e\u6027\u306e\u5909\u66f4\u306e\u307f\u3092\u76e3\u8996\u3059\u308b\u5834\u5408<\/li>\n\n\n\n<li>\u5c5e\u6027\u306e\u5909\u66f4\u524d\u306e\u5024\u3092\u6bd4\u8f03\u3057\u305f\u3044\u5834\u5408<\/li>\n\n\n\n<li>\u30c6\u30ad\u30b9\u30c8\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u5909\u66f4\u3092\u76e3\u8996\u3057\u305f\u3044\u5834\u5408<\/li>\n\n\n\n<li>\u30c6\u30ad\u30b9\u30c8\u306e\u5909\u66f4\u524d\u5f8c\u306e\u5185\u5bb9\u3092\u6bd4\u8f03\u3057\u305f\u3044\u5834\u5408<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"attributes%EF%BC%88%E5%BF%85%E9%A0%88%EF%BC%89\"><\/span>attributes\uff08\u5fc5\u9808\uff09<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>attributes<\/code>\u306f\u76e3\u8996\u3059\u308b\u8981\u7d20\u306e<strong>\u5c5e\u6027\u306e\u5909\u5316\uff08class\u3084style\u306a\u3069\uff09\u306e\u5224\u5b9a\u306e\u6709\u7121<\/strong>\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\" data-show-lang=\"1\"><code>const config = { attributes: true }; \/\/ true or false<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"childList%EF%BC%88%E5%BF%85%E9%A0%88%EF%BC%89\"><\/span>childList\uff08\u5fc5\u9808\uff09<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>childList<\/code>\u306f\u76e3\u8996\u5bfe\u8c61\u306e\u8981\u7d20\u306e<strong>\u5b50\u30ce\u30fc\u30c9\u306e\u8ffd\u52a0\u3084\u524a\u9664\u3092\u76e3\u8996\u3059\u308b\u304b\u3069\u3046\u304b<\/strong>\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\" data-show-lang=\"1\"><code>const config = { childList: true }; \/\/ true or false<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"subtree%EF%BC%88%E5%BF%85%E9%A0%88%EF%BC%89\"><\/span>subtree\uff08\u5fc5\u9808\uff09<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>subtree<\/code>\u306f\u76e3\u8996\u5bfe\u8c61\u306e\u8981\u7d20\u3060\u3051\u3067\u306a\u304f\u3001\u305d\u306e<strong>\u3059\u3079\u3066\u306e\u5b50\u5b6b\u8981\u7d20\u306b\u5bfe\u3057\u3066\u3082\u76e3\u8996\u3092\u884c\u3046\u304b\u3069\u3046\u304b<\/strong>\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\" data-show-lang=\"1\"><code>const config = { subtree: true }; \/\/ true or false<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"attributeFilter\"><\/span>attributeFilter<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>attributeFilter<\/code>\u306f<strong>\u7279\u5b9a\u306e\u5c5e\u6027\u306e\u5909\u66f4\u306e\u307f\u3092\u76e3\u8996\u3057\u305f\u3044<\/strong>\u5834\u5408\u306b\u3001\u305d\u306e\u5c5e\u6027\u540d\u3092\u914d\u5217\u3067\u6307\u5b9a\u3057\u307e\u3059\u3002\u203b<code>attributes<\/code>\u304c<code>true<\/code>\u3067\u3042\u308b\u5fc5\u8981\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\" data-show-lang=\"1\"><code>const config = { attributes: true, attributeFilter: [&#39;class&#39;, &#39;style&#39;] }; \/\/ \u914d\u5217\u3067class\u306a\u3069\u3092\u6307\u5b9a<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"attributeOldValue\"><\/span>attributeOldValue<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>attributeOldValue<\/code>\u306f\u5909\u66f4\u524d\u306e\u5c5e\u6027\u5024\u3092\u8a18\u9332\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u203b<code>attributes<\/code>\u304c<code>true<\/code>\u3067\u3042\u308b\u5fc5\u8981\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\" data-show-lang=\"1\"><code>const config = { attributes: true, attributeOldValue: true }; \/\/ true or false<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u305f\u3068\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u53e4\u3044\u30af\u30e9\u30b9\u3068\u65b0\u3057\u3044\u30af\u30e9\u30b9\uff08\u66f8\u304d\u63db\u3048\u305f\u30af\u30e9\u30b9\uff09\u3092\u8a18\u61b6\u3057\u3066\u304a\u304f\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\" data-show-lang=\"1\"><code>const callback = (mutationsList) =&gt; {\n  for (const mutation of mutationsList) {\n    if (mutation.type === &#39;attributes&#39; && mutation.attributeName === &#39;class&#39;) {\n      console.log(`Attribute &#39;class&#39; was modified.`);\n      console.log(`Old value: ${mutation.oldValue}`); \/\/ \u66f8\u304d\u63db\u3048\u308b\u524d\u306e\u5024\n      console.log(`New value: ${targetNode.getAttribute(&#39;class&#39;)}`); \/\/ \u66f8\u304d\u63db\u3048\u305f\u5f8c\u306e\u5024\n    }\n  }\n};<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"characterData\"><\/span>characterData<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">characterData\u306f\u76e3\u8996\u5bfe\u8c61\u306e<strong>\u30c6\u30ad\u30b9\u30c8\u306e\u5909\u66f4\u3092\u76e3\u8996\u3059\u308b\u304b\u3069\u3046\u304b<\/strong>\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u30c6\u30ad\u30b9\u30c8\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u5909\u66f4\u3092\u76e3\u8996\u3057\u305f\u3044\u5834\u5408\u306b\u6709\u52b9\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\" data-show-lang=\"1\"><code>const config = { characterData: true }; \/\/ true or false<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"characterDataOldValue\"><\/span>characterDataOldValue<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">characterDataOldValue\u306f<strong>\u5909\u66f4\u524d\u306e\u30c6\u30ad\u30b9\u30c8\u3092\u8a18\u9332\u3059\u308b\u304b\u3069\u3046\u304b<\/strong>\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u30c6\u30ad\u30b9\u30c8\u306e\u6bd4\u8f03\u3092\u3057\u305f\u3044\u6642\u306a\u3069\u306b\u6709\u7528\u3067\u3059\u3002\u203b<code>characterData<\/code>\u304c<code>true<\/code>\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>const config = { characterData: true, characterDataOldValue: true }; \/\/ true or false<\/code><\/pre><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%85%B7%E4%BD%93%E7%9A%84%E3%81%AA%E7%94%A8%E6%B3%95%E3%81%A8MutationObserver%E3%81%AE%E6%B3%A8%E6%84%8F%E7%82%B9\"><\/span>\u5177\u4f53\u7684\u306a\u7528\u6cd5\u3068MutationObserver\u306e\u6ce8\u610f\u70b9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">MutationObserver\u3092\u5229\u7528\u3059\u308b\u969b\u306f\u5c11\u3057\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u300c<strong>\u76e3\u8996\u5bfe\u8c61\u3092\u51fa\u6765\u308b\u3060\u3051\u7d5e\u308b<\/strong>\u300d\u65b9\u304c\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u843d\u3061\u306a\u3044\u306e\u3067\u3001\u5bfe\u8c61\u3092\u306a\u308b\u3079\u304f\u5c0f\u3055\u304f\u3059\u3079\u304d\u3067\u3059\u3002\u7bc4\u56f2\u304c\u5927\u304d\u3059\u304e\u308b\u3068\u305d\u308c\u3060\u3051\u51e6\u7406\u306b\u8ca0\u8377\u304c\u304b\u304b\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u307e\u305f\u3001\u300c<strong>\u76e3\u8996\u3057\u3066\u3044\u308bDOM\u306e\u4e2d\u306b\u65b0\u305f\u306b\u8981\u7d20\u3092\u52a0\u3048\u308b\u3068\u7121\u9650\u30eb\u30fc\u30d7\u306b\u9665\u308b<\/strong>\u300d\u306e\u3067\u3001\u76e3\u8996\u3092\u4e00\u65e6\u4e2d\u6b62\u3055\u305b\u3001\u8981\u7d20\u306e\u751f\u6210\u5f8c\u306b\u518d\u958b\u3055\u305b\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<br>\u7c21\u5358\u306a\u30c0\u30e1\u306a\u4f8b\u3092\u6319\u3052\u308b\u3068<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\" data-show-lang=\"1\"><code>const observer = new MutationObserver((mutations) =&gt; {\n    mutations.forEach((mutation) =&gt; {\n        \/\/ \u5909\u66f4\u51e6\u7406\n        $(&#39;#target&#39;).append(&#39;&lt;div&gt;&lt;\/div&gt;&#39;); \/\/ \u76e3\u8996\u306e\u30eb\u30fc\u30d7\u304c\u8d77\u3053\u308a\u30d6\u30e9\u30a6\u30b6\u304c\u30af\u30e9\u30c3\u30b7\u30e5\u3057\u307e\u3059\u2026\u2026\n    });\n});<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u7c21\u6f54\u306b\u8a18\u8f09\u3059\u308b\u305f\u3081\u306bjQuery\u3067\u66f8\u304d\u307e\u3057\u305f\u304c\u3001#target\u306f\u76e3\u8996\u4e2d\u306e\u8981\u7d20\u3068\u3059\u308b\u3068\u3001\u76e3\u8996\u4e2d\u306b&lt;div>\u306e\u8ffd\u52a0\u304c\u8d77\u3053\u308a\u3001\u3055\u3089\u306b\u305d\u308c\u3092\u76e3\u8996\u3057\u3066\u3044\u308b\u306e\u3067\u51e6\u7406\u304c\u9032\u307e\u305a\u3001\u3050\u308b\u3050\u308b\u3068\u7121\u9650\u30eb\u30fc\u30d7\u306b\u9665\u308a\u307e\u3059\u3002\u30d6\u30e9\u30a6\u30b6\u304c\u30af\u30e9\u30c3\u30b7\u30e5\u3059\u308b\u306e\u3067\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u2026\u2026<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5177\u4f53\u7684\u306b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4e00\u65e6\u76e3\u8996\u3092\u505c\u6b62\u3057\u3066\u304b\u3089&lt;div>\u3092\u8ffd\u52a0\u3057\u3001\u7d42\u308f\u3063\u305f\u3089\u76e3\u8996\u3092\u518d\u958b\u3059\u308b\u3068\u826f\u3044\u3067\u3059\u3002\u76e3\u8996\u5bfe\u8c61\u306b&lt;span>\u304c\u8ffd\u52a0\u3055\u308c\u305f\u5834\u5408\u306b&lt;div>\u3092\u8ffd\u52a0\u3059\u308b\u4f8b\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\" data-show-lang=\"1\"><code>const observer = new MutationObserver((mutations) =&gt; {\n    mutations.forEach((mutation) =&gt; {\n        if (mutation.type === &#39;childList&#39; && mutation.addedNodes.length &gt; 0) {\n            mutation.addedNodes.forEach((node) =&gt; {\n                if (node.nodeName === &#39;SPAN&#39;) { \/\/ &lt;span&gt;\u304c\u76e3\u8996\u5bfe\u8c61\u306b\u8ffd\u52a0\u3055\u308c\u305f\u3089\n             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class=\"wp-block-paragraph\">\u76e3\u8996\u5bfe\u8c61\u306b&lt;span>\u304c\u8ffd\u52a0\u3055\u308c\u305f\u5834\u5408\u306b\u3001<code>disconnect()<\/code>\u30e1\u30bd\u30c3\u30c9\u3067\u76e3\u8996\u3092\u505c\u6b62\u3057\u3001&lt;div>\u3092\u8ffd\u52a0\u3057\u3066\u304b\u3089<code>observer()<\/code>\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u518d\u958b\u3055\u305b\u3066\u3044\u307e\u3059\u3002\u7121\u9650\u30eb\u30fc\u30d7\u306f\u7d50\u69cb\u306a\u308a\u3084\u3059\u3044\u306e\u3067\u30cf\u30de\u3089\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046\u2026\u2026\u81ea\u6212\u3092\u8fbc\u3081\u3066\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\">MutationObserver 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