{"id":9343,"date":"2025-03-18T09:32:43","date_gmt":"2025-03-18T08:32:43","guid":{"rendered":"https:\/\/webhosting.de\/lazy-loading-intersection-observer-api\/"},"modified":"2025-03-18T09:32:43","modified_gmt":"2025-03-18T08:32:43","slug":"%e4%ba%a4%e5%b7%ae%e7%82%b9%e3%82%aa%e3%83%96%e3%82%b6%e3%83%bc%e3%83%90%e3%83%bcapi%e3%81%ae%e9%81%85%e5%bb%b6%e3%83%ad%e3%83%bc%e3%83%89","status":"publish","type":"post","link":"https:\/\/webhosting.de\/ja\/lazy-loading-intersection-observer-api\/","title":{"rendered":"Intersection Observer API\u3092\u4f7f\u3063\u305f\u52b9\u7387\u7684\u306a\u9045\u5ef6\u30ed\u30fc\u30c9\uff1a\u5305\u62ec\u7684\u306a\u30ac\u30a4\u30c9"},"content":{"rendered":"<p><h2>\u30c7\u30b8\u30bf\u30eb\u6642\u4ee3\u306b\u304a\u3051\u308b\u9ad8\u901f\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u91cd\u8981\u6027<\/h2><\/p>\n<p>\u4eca\u65e5\u306e\u30c7\u30b8\u30bf\u30eb\u306e\u4e16\u754c\u3067\u306f\u3001\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u8aad\u307f\u8fbc\u307f\u901f\u5ea6\u306f\u3001\u30dd\u30b8\u30c6\u30a3\u30d6\u306a\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u306e\u305f\u3081\u306e\u6c7a\u5b9a\u7684\u306a\u57fa\u6e96\u3067\u3059\u3002\u8aad\u307f\u8fbc\u307f\u6642\u9593\u306e\u901f\u3055\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u6e80\u8db3\u5ea6\u3092\u5411\u4e0a\u3055\u305b\u308b\u3060\u3051\u3067\u306a\u304f\u3001Google\u306a\u3069\u306e\u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u306b\u3068\u3063\u3066\u3082\u91cd\u8981\u306a\u30e9\u30f3\u30ad\u30f3\u30b0\u8981\u56e0\u3067\u3059\u3002\u9045\u3044\u30da\u30fc\u30b8\u306f\u76f4\u5e30\u7387\u304c\u9ad8\u304f\u306a\u308b\u3053\u3068\u304c\u591a\u304f\u3001\u6f5c\u5728\u9867\u5ba2\u306e\u4f01\u696d\u306b\u5bfe\u3059\u308b\u4fe1\u983c\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u7406\u7531\u304b\u3089\u3001\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u306e\u5bfe\u7b56\u304c\u4e0d\u53ef\u6b20\u3067\u3059\u3002\u6700\u3082\u5b9f\u7e3e\u306e\u3042\u308b\u30c6\u30af\u30cb\u30c3\u30af\u306e1\u3064\u306f\u3001\u7279\u306bIntersection Observer API\u3068\u7d44\u307f\u5408\u308f\u305b\u305f\u30ec\u30a4\u30b8\u30fc\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u3067\u3059\u3002\u753b\u50cf\u3084\u305d\u306e\u4ed6\u306e\u30e1\u30c7\u30a3\u30a2\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u8aad\u307f\u8fbc\u307f\u3092\u9045\u5ef6\u3055\u305b\u308b\u3053\u3068\u3067\u3001\u30e6\u30fc\u30b6\u30fc\u30a8\u30af\u30b9\u30da\u30ea\u30a8\u30f3\u30b9\u304c\u5927\u5e45\u306b\u5411\u4e0a\u3057\u307e\u3059\u3002<\/p>\n<p><h2>\u30ec\u30a4\u30b8\u30fc\u30fb\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\uff1a\u57fa\u672c\u3068\u5229\u70b9<\/h2><\/p>\n<p>\u30ec\u30a4\u30b8\u30fc\u30fb\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u3068\u306f\u3001\u753b\u50cf\u3084\u52d5\u753b\u306a\u3069\u306e\u30e1\u30c7\u30a3\u30a2\u30fb\u30b3\u30f3\u30c6\u30f3\u30c4\u3084\u91cd\u91cf\u306e\u3042\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u53ef\u8996\u9818\u57df\uff08\u3044\u308f\u3086\u308b\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\uff09\u306b\u5b9f\u969b\u306b\u5230\u9054\u3057\u305f\u3068\u304d\u306e\u307f\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u304b\u3089\u8aad\u307f\u8fbc\u3080\u65b9\u5f0f\u3092\u6307\u3057\u307e\u3059\u3002\u3053\u306e\u6280\u8853\u3067\u306f\u3001\u6700\u521d\u306e\u30da\u30fc\u30b8\u30d3\u30e5\u30fc\u306b\u5fc5\u8981\u306a\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u307f\u304c\u30ed\u30fc\u30c9\u3055\u308c\u308b\u305f\u3081\u3001\u30da\u30fc\u30b8\u306e\u521d\u671f\u30ed\u30fc\u30c9\u6642\u9593\u304c\u77ed\u7e2e\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u5e2f\u57df\u5e45\u304c\u7bc0\u7d04\u3055\u308c\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u30b5\u30fc\u30d0\u30fc\u306e\u8ca0\u8377\u3082\u8efd\u6e1b\u3055\u308c\u3001\u5168\u4f53\u7684\u306a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002<\/p>\n<p>\u9045\u5ef6\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u306e\u5229\u70b9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3042\u308b\u3002<\/p>\n<ul>\n<li>\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u6642\u9593\u306e\u6539\u5584\u306b\u3088\u308b\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u306e\u6700\u9069\u5316<\/li>\n<li>\u5fc5\u8981\u306a\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u307f\u3092\u30ed\u30fc\u30c9\u3059\u308b\u305f\u3081\u3001\u5e2f\u57df\u5e45\u3092\u52b9\u7387\u7684\u306b\u5229\u7528\u3067\u304d\u308b<\/li>\n<li>\u30da\u30fc\u30b8\u304c\u3088\u308a\u901f\u304f\u53cd\u5fdc\u3059\u308b\u305f\u3081\u3001\u76f4\u5e30\u7387\u304c\u6e1b\u5c11\u3059\u308b\u3002<\/li>\n<li>Google\u304c\u9ad8\u901f\u306a\u30da\u30fc\u30b8\u3092\u597d\u3080\u305f\u3081\u3001\u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u3067\u306e\u9806\u4f4d\u304c\u5411\u4e0a\u3059\u308b\u3002<\/li>\n<\/ul>\n<p>\u30ec\u30a4\u30b8\u30fc\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u306f\u3001\u7279\u306b\u5b89\u5b9a\u3057\u305f\u9ad8\u901f\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u63a5\u7d9a\u304c\u5e38\u306b\u4fdd\u8a3c\u3055\u308c\u3066\u3044\u306a\u3044\u30e2\u30d0\u30a4\u30eb\u30c7\u30d0\u30a4\u30b9\u306b\u304a\u3044\u3066\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u5229\u4fbf\u6027\u306b\u304b\u306a\u308a\u306e\u9055\u3044\u3092\u3082\u305f\u3089\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p><h2>Intersection Observer API\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h2><\/p>\n<p>Intersection Observer API \u306f\u3001\u958b\u767a\u8005\u304c DOM \u8981\u7d20\u306e\u53ef\u8996\u6027\u3092\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u3067\u76e3\u8996\u3067\u304d\u308b\u3001\u6700\u65b0\u306e\u30d6\u30e9\u30a6\u30b6 API \u3067\u3059\u3002\u3053\u306e API \u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u7279\u5b9a\u306e\u8981\u7d20\u304c\u3044\u3064\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u306b\u5165\u308b\u304b\u51fa\u308b\u304b\u3092\u5224\u65ad\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30da\u30fc\u30b8\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5f71\u97ff\u3059\u308b\u3088\u3046\u306a\u3001\u8a08\u7b97\u96c6\u7d04\u7684\u3067\u7d99\u7d9a\u7684\u306a\u30c1\u30a7\u30c3\u30af\u3092\u907f\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee3\u308f\u308a\u306b\u3001\u76e3\u8996\u3055\u308c\u305f\u8981\u7d20\u304c\u5b9a\u7fa9\u3055\u308c\u305f\u3057\u304d\u3044\u5024\u306b\u9054\u3059\u308b\u3068\u3059\u3050\u306b\u3001\u975e\u540c\u671f\u306e\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u304c\u751f\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u4ea4\u5dee\u70b9\u30aa\u30d6\u30b6\u30fc\u30d0\u30fcAPI\u3092\u4f7f\u7528\u3059\u308b\u305f\u3081\u306e\u57fa\u672c\u7684\u306a\u69cb\u9020\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3042\u308b\uff1a<\/p>\n<pre>\nconst observer = new IntersectionObserver(callback, options)\uff1b\n<\/pre>\n<p>\u3053\u306e\u30b3\u30fc\u30c9\u4f8b\u3067\u306f <code>\u30b3\u30fc\u30eb\u30d0\u30c3\u30af<\/code>-\u30d5\u30a1\u30f3\u30af\u30b7\u30e7\u30f3\u306f\u3001\u53ef\u8996\u30a8\u30ea\u30a2\u306b\u5230\u9054\u3057\u305f\u3068\u304d\u3001\u307e\u305f\u306f\u30a8\u30ea\u30a2\u304b\u3089\u51fa\u305f\u3068\u304d\u306b\u5b9f\u884c\u3055\u308c\u308b\u30ed\u30b8\u30c3\u30af\u3092\u62c5\u5f53\u3057\u307e\u3059\u3002\u3053\u306e <code>\u30aa\u30d7\u30b7\u30e7\u30f3<\/code> \u306a\u3069\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u5b9a\u7fa9\u3059\u308b\u3002 <code>\u6839\u5143<\/code>, <code>\u30eb\u30fc\u30c8\u30de\u30fc\u30b8\u30f3<\/code> \u305d\u3057\u3066 <code>\u95be\u5024<\/code>\u3053\u308c\u306f\u3001\u89b3\u6e2c\u9650\u754c\u3068\u89b3\u6e2c\u6761\u4ef6\u3092\u5b9a\u7fa9\u3059\u308b\u3082\u306e\u3067\u3042\u308b\u3002<\/p>\n<p><h2>\u4ea4\u5dee\u70b9\u30aa\u30d6\u30b6\u30fc\u30d0\u30fcAPI\u306b\u3088\u308b\u9045\u5ef6\u30ed\u30fc\u30c9\u306e\u5b9f\u88c5<\/h2><\/p>\n<p>\u9045\u5ef6\u30ed\u30fc\u30c9\u306e\u5b9f\u7528\u7684\u306a\u5b9f\u88c5\u306f\u3001\u307b\u3093\u306e\u6570\u30b9\u30c6\u30c3\u30d7\u3067\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u8a73\u7d30\u306a\u5b9f\u88c5\u624b\u9806\u3092\u793a\u3057\u307e\u3059\uff1a<\/p>\n<p><h2>HTML\u69cb\u9020\u306e\u5b9a\u7fa9<\/h2><\/p>\n<p>\u307e\u305a\u3001\u30c0\u30e9\u30c0\u30e9\u3068\u8aad\u307f\u8fbc\u307e\u308c\u308b\u30b3\u30f3\u30c6\u30f3\u30c4\u306eHTML\u69cb\u9020\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304b\u3089\u59cb\u3081\u307e\u3059\u3002\u3053\u308c\u3092\u884c\u3046\u306b\u306f <code>\u30c7\u30fc\u30bf\u30bd\u30fc\u30b9<\/code>-\u5b9f\u969b\u306e\u753b\u50cfURL\u3092\u542b\u3080 <code>\u30bd\u30fc\u30b9<\/code>-\u5c5e\u6027\u306f\u30d7\u30ec\u30fc\u30b9\u30db\u30eb\u30c0\u753b\u50cf\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u8aad\u307f\u8fbc\u307f\u306e\u904e\u7a0b\u3067\u30e6\u30fc\u30b6\u30fc\u304c\u7a7a\u306e\u9818\u57df\u3092\u898b\u308b\u306e\u3092\u9632\u304e\u307e\u3059\u3002<\/p>\n<pre>\n&lt;img data-src=&quot;image-url.jpg&quot; src=&quot;placeholder.jpg&quot; alt=&quot;\u9045\u5ef6\u30ed\u30fc\u30c9\u753b\u50cf&quot; class=&quot;lazy&quot; \/&gt;\n<\/pre>\n<p>\u30d7\u30ec\u30fc\u30b9\u30db\u30eb\u30c0\u753b\u50cf\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u3082\u3046\u3059\u3050\u8aad\u307f\u8fbc\u307e\u308c\u308b\u3068\u3044\u3046\u8996\u899a\u7684\u306a\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u3092\u30e6\u30fc\u30b6\u30fc\u306b\u63d0\u4f9b\u3057\u3001\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u3067\u306e\u5168\u4f53\u7684\u306a\u4f53\u9a13\u3092\u5411\u4e0a\u3055\u305b\u307e\u3059\u3002<\/p>\n<p><h2>JavaScript\u306e\u5b9f\u88c5<\/h2><\/p>\n<p>HTML\u69cb\u9020\u306e\u6b21\u306f\u3001JavaScript\u306e\u7d71\u5408\u3067\u3059\u3002\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u4f7f\u3063\u3066\u3001\u3042\u306a\u305f\u306e\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306b\u9045\u5ef6\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n<pre>\nconst lazyImages = document.querySelectorAll('.lazy')\uff1b\nconst\u30aa\u30d7\u30b7\u30e7\u30f3 = {\n  root: null\u3001\n  rootMargin: '0px'\u3001\n  threshold: 0.1\n};\n\nconst callback = (entries, observer) =&gt; { { { entries.forEach(\u30a8\u30f3\u30c8\u30ea\u30fc, \u30aa\u30d6\u30b6\u30fc\u30d0\u30fc)\n  entries.forEach(\u30a8\u30f3\u30c8\u30ea\u30fc =&gt; {)\n    if (entries.isIntersecting){\u3068\u306a\u308a\u307e\u3059\u3002\n      const img = entry.target\uff1b\n      img.src = img.getAttribute('data-src')\uff1b\n      observer.unobserve(img)\uff1b\n    }\n  });\n};\n\nconst observer = new IntersectionObserver(callback, options)\uff1b\n\nlazyImages.forEach(\u30a4\u30e1\u30fc\u30b8 =&gt; {)\n  observer.observe(image)\uff1b\n});\n<\/pre>\n<p>\u3053\u306eJavaScript\u30b9\u30cb\u30da\u30c3\u30c8\u3067\u306f\u3001\u30af\u30e9\u30b9 <code>\u3078\u305f\u308c<\/code> \u306b\u306f\u30aa\u30d6\u30b6\u30fc\u30d0\u30fc\u304c\u5272\u308a\u5f53\u3066\u3089\u308c\u308b\u3002\u753b\u50cf\u304c\u30e6\u30fc\u30b6\u30fc\u306e\u898b\u3048\u308b\u7bc4\u56f2\u306b\u5165\u308b\u3068\u3001\u3059\u3050\u306b <code>\u30c7\u30fc\u30bf\u30bd\u30fc\u30b9<\/code>-\u5c5e\u6027\u3092 <code>\u30bd\u30fc\u30b9<\/code>-\u5c5e\u6027\u304c\u4e0e\u3048\u3089\u308c\u3001\u753b\u50cf\u304c\u30ed\u30fc\u30c9\u3055\u308c\u308b\u3002\u4e0d\u5fc5\u8981\u306a\u30c1\u30a7\u30c3\u30af\u3092\u907f\u3051\u308b\u305f\u3081\u306b\u3001\u753b\u50cf\u306f\u89b3\u6e2c\u304b\u3089\u53d6\u308a\u9664\u304b\u308c\u308b\u3002<\/p>\n<p><h2>\u9ad8\u5ea6\u306a\u6700\u9069\u5316\u6280\u8853\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2><\/p>\n<p>\u5358\u306b\u9045\u5ef6\u30ed\u30fc\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u3055\u3089\u306b\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u306b\u8003\u616e\u3059\u3079\u304d\u30c6\u30af\u30cb\u30c3\u30af\u304c\u4ed6\u306b\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u305d\u306e\u4ed6\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u3044\u304f\u3064\u304b\u3054\u7d39\u4ecb\u3057\u307e\u3059\uff1a<\/p>\n<ul>\n<li>WebP\u306a\u3069\u306e\u6700\u9069\u5316\u3055\u308c\u305f\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u4f7f\u7528\u3057\u3001\u753b\u8cea\u3092\u7dad\u6301\u3057\u305f\u307e\u307e\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u5c0f\u3055\u304f\u3059\u308b\u3002<\/li>\n<li>\u30ec\u30a4\u30b8\u30fc\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u3068\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30c7\u30b6\u30a4\u30f3\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u3055\u307e\u3056\u307e\u306a\u30a8\u30f3\u30c9\u30c7\u30d0\u30a4\u30b9\u3067\u6700\u9069\u306a\u8868\u793a\u3092\u5b9f\u73fe\u3057\u307e\u3059\u3002<\/li>\n<li>\u30d6\u30e9\u30a6\u30b6\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u5229\u7528\u3057\u3066\u3001\u983b\u7e41\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u30ea\u30bd\u30fc\u30b9\u3092\u30ed\u30fc\u30ab\u30eb\u306b\u4fdd\u5b58\u3057\u3001\u7e70\u308a\u8fd4\u3057\u30a2\u30af\u30bb\u30b9\u3059\u308b\u969b\u306e\u8aad\u307f\u8fbc\u307f\u6642\u9593\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\u3002<\/li>\n<li>\u91cd\u8981\u306a\u8981\u7d20\u304c\u6700\u521d\u306b\u8aad\u307f\u8fbc\u307e\u308c\u308b\u3088\u3046\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u306b\u8ce2\u660e\u306a\u512a\u5148\u9806\u4f4d\u3092\u3064\u3051\u308b\u3002<\/li>\n<li>\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u30d6\u30ed\u30c3\u30af\u3092\u907f\u3051\u308b\u305f\u3081\u306b\u3001\u5916\u90e8\u30b9\u30af\u30ea\u30d7\u30c8\u306b\u306fasynchronous\u5c5e\u6027\u307e\u305f\u306fdefer\u5c5e\u6027\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u3053\u308c\u3089\u306e\u5bfe\u7b56\u3068\u9045\u5ef6\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u8aad\u307f\u8fbc\u307f\u6642\u9593\u3092\u77ed\u7e2e\u3067\u304d\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u30b5\u30a4\u30c8\u306e\u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u6700\u9069\u5316\uff08SEO\uff09\u3082\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u306f\u3001\u8aad\u307f\u8fbc\u307f\u304c\u901f\u304f\u3001\u30b9\u30e0\u30fc\u30ba\u306a\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u3092\u63d0\u4f9b\u3059\u308b\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u3092\u597d\u307f\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u691c\u7d22\u7d50\u679c\u306e\u30e9\u30f3\u30ad\u30f3\u30b0\u306b\u9577\u671f\u7684\u306b\u30d7\u30e9\u30b9\u306e\u52b9\u679c\u3092\u3082\u305f\u3089\u3057\u307e\u3059\u3002<\/p>\n<p><h2>WordPress\u306b\u9045\u5ef6\u30ed\u30fc\u30c9\u3092\u7d44\u307f\u8fbc\u3080<\/h2><\/p>\n<p>WordPress\u30e6\u30fc\u30b6\u30fc\u306b\u306f\u3001\u9045\u5ef6\u30ed\u30fc\u30c9\u306e\u5b9f\u88c5\u3092\u5927\u5e45\u306b\u7c21\u7d20\u5316\u3059\u308b\u7279\u5225\u306a\u30d7\u30e9\u30b0\u30a4\u30f3\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30d7\u30e9\u30b0\u30a4\u30f3\u306f\u3001\u5e83\u7bc4\u306a\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u77e5\u8b58\u3092\u5fc5\u8981\u3068\u305b\u305a\u306b\u3001\u4e0a\u8a18\u306e\u30ed\u30b8\u30c3\u30af\u3092\u65e2\u5b58\u306e\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306b\u7d71\u5408\u3057\u307e\u3059\u3002\u9045\u5ef6\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u4eba\u6c17\u306e\u3042\u308b\u30d7\u30e9\u30b0\u30a4\u30f3\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n<ul>\n<li>Lazy Load by WP Rocket - \u753b\u50cf\u306e\u8aad\u307f\u8fbc\u307f\u6642\u9593\u3092\u6700\u9069\u5316\u3059\u308b\u8efd\u91cf\u30d7\u30e9\u30b0\u30a4\u30f3\u3002<\/li>\n<li>a3 Lazy Load - \u8a2d\u5b9a\u304c\u7c21\u5358\u3067\u3001\u307b\u3068\u3093\u3069\u306e\u30e1\u30c7\u30a3\u30a2\u30bf\u30a4\u30d7\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u67d4\u8edf\u306a\u30d7\u30e9\u30b0\u30a4\u30f3\u3067\u3059\u3002<\/li>\n<li>Smush - \u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3082\u3067\u304d\u308b\u753b\u50cf\u5727\u7e2e\u30d7\u30e9\u30b0\u30a4\u30f3\u3002<\/li>\n<\/ul>\n<p>\u3053\u308c\u3089\u306e\u30d7\u30e9\u30b0\u30a4\u30f3\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u306f\u3001\u5b9a\u671f\u7684\u306b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002Google Lighthouse\u3084GTmetrix\u306a\u3069\u306e\u30c4\u30fc\u30eb\u3092\u4f7f\u7528\u3057\u3066\u3001\u8aad\u307f\u8fbc\u307f\u6642\u9593\u304c\u6700\u9069\u5316\u3055\u308c\u7d9a\u3051\u3001\u65b0\u305f\u306a\u554f\u984c\u304c\u767a\u751f\u3057\u306a\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p><h2>\u9045\u5ef6\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u8ab2\u984c\u3068\u89e3\u6c7a\u7b56<\/h2><\/p>\n<p>\u30ec\u30a4\u30b8\u30fc\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u306b\u306f\u591a\u304f\u306e\u5229\u70b9\u304c\u3042\u308b\u304c\u3001\u5c0e\u5165\u3084\u904b\u7528\u306e\u969b\u306b\u3044\u304f\u3064\u304b\u306e\u8ab2\u984c\u3082\u767a\u751f\u3059\u308b\uff1a<\/p>\n<ul>\n<li>\u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u306b\u3088\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u554f\u984c\uff1a\u3059\u3079\u3066\u306e\u95a2\u9023\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u30af\u30ed\u30fc\u30e9\u30fc\u306b\u3082\u898b\u3064\u304b\u308b\u3088\u3046\u306b\u3059\u308b\u3002\u5fc5\u8981\u3067\u3042\u308c\u3070\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u91cd\u8981\u306a\u3082\u306e\u3068\u3057\u3066\u5206\u985e\u3055\u308c\u308b\u3088\u3046\u306b\u8ffd\u52a0\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u4f7f\u7528\u3059\u308b\u3002<\/li>\n<li>\u30d3\u30b8\u30e5\u30a2\u30eb\u8868\u793a\u306e\u9045\u5ef6\uff1a\u5834\u5408\u306b\u3088\u3063\u3066\u306f\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u8aad\u307f\u8fbc\u307f\u304c\u9045\u3059\u304e\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f <code>\u30eb\u30fc\u30c8\u30de\u30fc\u30b8\u30f3<\/code>-\u5024\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u30a8\u30ec\u30e1\u30f3\u30c8\u304c\u3088\u308a\u65e9\u304f\u30ed\u30fc\u30c9\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308b\u3002<\/li>\n<li>\u53e4\u3044\u30d6\u30e9\u30a6\u30b6\u306e\u30b5\u30dd\u30fc\u30c8\u4e0d\u8db3\uff1aIntersection Observer API\u306f\u307b\u3068\u3093\u3069\u306e\u30e2\u30c0\u30f3\u30d6\u30e9\u30a6\u30b6\u3067\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u53e4\u3044\u30d6\u30e9\u30a6\u30b6\u7528\u306e\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u5165\u5ff5\u306a\u30c6\u30b9\u30c8\u3068\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u6226\u7565\u306e\u5c0e\u5165\u306b\u3088\u308a\u3001\u3053\u308c\u3089\u306e\u8ab2\u984c\u3092\u514b\u670d\u3057\u3001\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u304c\u3042\u3089\u3086\u308b\u30c7\u30d0\u30a4\u30b9\u3084\u30d6\u30e9\u30a6\u30b6\u3067\u6700\u9069\u306b\u52d5\u4f5c\u3059\u308b\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><h2>\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u6642\u9593\u306e\u6700\u9069\u5316\u306b\u3088\u308bSEO\u52b9\u679c<\/h2><\/p>\n<p>\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u8aad\u307f\u8fbc\u307f\u901f\u5ea6\u306f\u3001\u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u6700\u9069\u5316\u306e\u4e2d\u5fc3\u7684\u306a\u8981\u7d20\u3067\u3059\u3002Google\u3092\u306f\u3058\u3081\u3068\u3059\u308b\u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u306f\u3001\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u3092\u8a55\u4fa1\u3059\u308b\u969b\u306b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u8003\u616e\u3057\u307e\u3059\u3002\u8aad\u307f\u8fbc\u307f\u6642\u9593\u304c\u901f\u3051\u308c\u3070\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3055\u308c\u3084\u3059\u304f\u306a\u308a\u3001\u30e9\u30f3\u30ad\u30f3\u30b0\u3082\u4e0a\u304c\u308a\u307e\u3059\u3002\u30ec\u30a4\u30b8\u30fc\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u306f\u3001\u8aad\u307f\u8fbc\u307f\u6642\u9593\u3092\u6539\u5584\u3059\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u30e6\u30fc\u30b6\u30fc\u30a8\u30af\u30b9\u30da\u30ea\u30a8\u30f3\u30b9\u3092\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u3001\u3053\u3053\u3067\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u4ed6\u306eSEO\u306e\u5229\u70b9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\uff1a<\/p>\n<ul>\n<li>\u30da\u30fc\u30b8\u6ede\u5728\u6642\u9593\u306e\u5897\u52a0\uff1a\u9577\u3044\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u6642\u9593\u306b\u3082\u52d5\u3058\u306a\u3044\u8a2a\u554f\u8005\u306f\u3001\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306b\u9577\u304f\u6ede\u5728\u3057\u3001\u30b3\u30f3\u30c6\u30f3\u30c4\u3068\u3088\u308a\u96c6\u4e2d\u7684\u306b\u5bfe\u8a71\u3057\u307e\u3059\u3002<\/li>\n<li>\u76f4\u5e30\u7387\u306e\u4f4e\u4e0b\uff1a\u8aad\u307f\u8fbc\u307f\u306e\u901f\u3044\u30da\u30fc\u30b8\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u6b21\u306e\u30da\u30fc\u30b8\u3092\u547c\u3073\u51fa\u3057\u305f\u308a\u3001\u30aa\u30d5\u30a1\u30fc\u3092\u8a73\u3057\u304f\u898b\u305f\u308a\u3059\u308b\u52d5\u6a5f\u4ed8\u3051\u306b\u306a\u308a\u307e\u3059\u3002<\/li>\n<li>\u30e2\u30d0\u30a4\u30eb\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u5411\u4e0a\uff1a\u7279\u306b\u30e2\u30d0\u30a4\u30eb\u30e6\u30fc\u30b6\u30fc\u306f\u3001\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u6642\u9593\u306e\u77ed\u7e2e\u304b\u3089\u6069\u6075\u3092\u53d7\u3051\u3001\u30b3\u30f3\u30d0\u30fc\u30b8\u30e7\u30f3\u7387\u306e\u5411\u4e0a\u306b\u76f4\u63a5\u8ca2\u732e\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u305d\u306e\u305f\u3081\u3001\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3084\u305d\u306e\u4ed6\u306e\u8aad\u307f\u8fbc\u307f\u6642\u9593\u306e\u6700\u9069\u5316\u3092\u4e00\u8cab\u3057\u3066\u5b9f\u65bd\u3059\u308b\u3053\u3068\u306f\u3001SEO\u306b\u5927\u304d\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u5e38\u306b\u6700\u5148\u7aef\u306e\u6280\u8853\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306b\u3001\u3053\u308c\u3089\u306e\u5bfe\u7b56\u3092\u5b9a\u671f\u7684\u306b\u30c1\u30a7\u30c3\u30af\u3057\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u9069\u5fdc\u3055\u305b\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002<\/p>\n<p><h2>\u751f\u7523\u696d\u52d9\u306b\u304a\u3051\u308b\u5b9f\u8df5\u7684\u306a\u30d2\u30f3\u30c8<\/h2><\/p>\n<p>\u65e2\u5b58\u306e\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306b\u9045\u5ef6\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u7d44\u307f\u8fbc\u3080\u5834\u5408\u3001\u5b9f\u904b\u7528\u3067\u30b9\u30e0\u30fc\u30ba\u306b\u6a5f\u80fd\u3059\u308b\u3088\u3046\u306b\u3001\u3044\u304f\u3064\u304b\u306e\u5b9f\u7528\u7684\u306a\u30d2\u30f3\u30c8\u306b\u5f93\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n<ul>\n<li>Google Lighthouse\u3001GTmetrix\u3001WebPageTest\u306a\u3069\u306e\u69d8\u3005\u306a\u30c4\u30fc\u30eb\u3067\u5b9a\u671f\u7684\u306b\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u3092\u30c6\u30b9\u30c8\u3057\u3001\u5909\u66f4\u306e\u52b9\u679c\u3092\u6e2c\u5b9a\u3057\u3066\u6700\u9069\u5316\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\n<li>\u7279\u306b\u30b3\u30a2\u30b3\u30fc\u30c9\u306b\u4ecb\u5165\u3059\u308b\u5834\u5408\u306f\u3001\u5909\u66f4\u3092\u5b9f\u65bd\u3059\u308b\u524d\u306b\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u30b3\u30d4\u30fc\u3092\u4f5c\u6210\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li>\u672c\u756a\u904b\u7528\u306b\u79fb\u884c\u3059\u308b\u524d\u306b\u3001\u30c6\u30b9\u30c8\u74b0\u5883\u3067\u9045\u5ef6\u30ed\u30fc\u30c9\u5b9f\u88c5\u306e\u3055\u307e\u3056\u307e\u306a\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u3092\u8a55\u4fa1\u3059\u308b\u6a5f\u4f1a\u3092\u5229\u7528\u3059\u308b\u3002<\/li>\n<li>\u3059\u3079\u3066\u306e\u5909\u66f4\u3068\u6700\u9069\u5316\u3055\u308c\u305f\u8a2d\u5b9a\u3092\u6587\u66f8\u5316\u3057\u3001\u5c06\u6765\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3084\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u306b\u8fc5\u901f\u306b\u5bfe\u5fdc\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/li>\n<li>\u3059\u3079\u3066\u306e\u753b\u50cf\u3068\u30e1\u30c7\u30a3\u30a2\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u6700\u9069\u5316\u3055\u308c\u305f\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u8aad\u307f\u8fbc\u307f\u6642\u9593\u304c\u77ed\u7e2e\u3055\u308c\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u30b5\u30a4\u30c8\u5168\u4f53\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3082\u5411\u4e0a\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u3053\u308c\u3089\u306e\u30d2\u30f3\u30c8\u3092\u6d3b\u7528\u3059\u308c\u3070\u3001\u9045\u5ef6\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u306e\u5c0e\u5165\u3092\u6210\u529f\u3055\u305b\u3001\u540c\u6642\u306b\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u7d99\u7d9a\u7684\u306a\u6700\u9069\u5316\u3092\u5b9f\u73fe\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><h2>\u7dcf\u62ec\u3068\u5c55\u671b<\/h2><\/p>\n<p>Intersection Observer 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