{"id":629,"date":"2023-12-12T15:42:38","date_gmt":"2023-12-12T06:42:38","guid":{"rendered":"https:\/\/fastest.jp\/blog\/?p=629"},"modified":"2023-12-12T15:42:45","modified_gmt":"2023-12-12T06:42:45","slug":"reduce-unused-javascript","status":"publish","type":"post","link":"https:\/\/fastest.jp\/blog\/reduce-unused-javascript\/","title":{"rendered":"\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u3068\u306f\uff1f\u6982\u8981\u304b\u3089\u6539\u5584\u65b9\u6cd5\u307e\u3067\u89e3\u8aac"},"content":{"rendered":"\n<p>\u300c\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u300d\u306f Google \u304c\u63d0\u4f9b\u3059\u308b PageSpeed Insights \u306e\u6539\u5584\u9805\u76ee\u306e\u3072\u3068\u3064\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u304b\u3057\u3001\u6539\u5584\u6848\u3068\u3057\u3066\u51fa\u3066\u304d\u305f\u3082\u306e\u306e JavaScript \u306b\u95a2\u3059\u308b\u77e5\u8b58\u304c\u306a\u304f\u3001\u6539\u5584\u3067\u304d\u305a\u306b\u3044\u308b\u4eba\u3082\u3044\u308b\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n\n\n\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u300c\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u300d\u306e\u6982\u8981\u304b\u3089\u6539\u5584\u65b9\u6cd5\u307e\u3067\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u3068\u306f<\/h2>\n\n\n\n<p>\u3053\u306e\u7ae0\u3067\u306f\u3001\u300c\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u300d\u306e\u6982\u8981\u3068\u5b9a\u7fa9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u306e\u6982\u8981<\/h3>\n\n\n\n<p>\u300c\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u300d\u3068\u306f\u3001\u5916\u90e8\u30ea\u30bd\u30fc\u30b9\u306b\u542b\u307e\u308c\u308b JavaScript \u306e\u30b3\u30fc\u30c9\u3092\u6700\u9069\u5316\u3057\u3001Web \u30b5\u30a4\u30c8\u306e\u8868\u793a\u901f\u5ea6\u3092\u6539\u5584\u3059\u308b\u624b\u6cd5\u3067\u3059\u3002<br>\u30da\u30fc\u30b8\u306b\u591a\u304f\u306e JavaScript \u304c\u542b\u307e\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u5b9f\u884c\u306b\u6642\u9593\u304c\u304b\u304b\u308a\u3001Web \u30da\u30fc\u30b8\u306e\u8868\u793a\u901f\u5ea6\u304c\u9045\u304f\u306a\u308a\u307e\u3059\u3002<br>\u305d\u306e\u305f\u3081\u3001\u300c\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u300d\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u300c\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u300d\u306f First Contentful Paint\uff08FCP\uff09\u3001 Largest Contentful Paint\uff08LCP\uff09\u3001First Input Delay\uff08FID\uff09\u306e\u6539\u5584\u306b\u6709\u52b9\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">First Contentful Paint\uff08FCP\uff09<\/h4>\n\n\n\n<p>FCP \u3068\u306f\u3001Web \u30da\u30fc\u30b8\u306e\u8aad\u307f\u8fbc\u307f\u304c\u958b\u59cb\u3055\u308c\u3066\u304b\u3089\u3001\u30da\u30fc\u30b8\u5185\u306e\u3044\u305a\u308c\u304b\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u521d\u3081\u3066\u63cf\u753b\u3055\u308c\u308b\u307e\u3067\u306e\u6642\u9593\u3067\u3059\u3002&nbsp;<\/p>\n\n\n\n<p>FCP \u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u65b9\u306f\u3001\u4ee5\u4e0b\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<br>\u3010\u53c2\u8003\u3011First Contentful Paint\uff08FCP\uff09\u3068\u306f\uff1f\u6982\u8981\u3068\u6539\u5584\u65b9\u6cd5\u3092\u89e3\u8aac<br><a href=\"https:\/\/fastest.jp\/blog\/first-contentful-paint\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/fastest.jp\/blog\/first-contentful-paint\/<\/a><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Largest Contentful Paint\uff08LCP\uff09<\/h4>\n\n\n\n<p>LCP \u3068\u306f\u3001Web \u30da\u30fc\u30b8\u5185\u306e\u6700\u3082\u30d5\u30a1\u30a4\u30eb\u5bb9\u91cf\u306e\u5927\u304d\u3044\u753b\u50cf\u3084\u52d5\u753b\u304c\u8868\u793a\u3055\u308c\u308b\u307e\u3067\u306e\u6642\u9593\u3067\u3059\u3002<br>LCP \u306f Web \u30b5\u30a4\u30c8\u304c\u30e6\u30fc\u30b6\u30fc\u306b\u3068\u3063\u3066\u3069\u308c\u3060\u3051\u4f7f\u3044\u3084\u3059\u3044\u304b\u3092\u8a55\u4fa1\u3059\u308b\u6307\u6a19\u3067\u3042\u308b Core Web Vitals \u306e\u3072\u3068\u3064\u3067\u3059\u3002<\/p>\n\n\n\n<p>LCP \u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u65b9\u306f\u3001\u4ee5\u4e0b\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<br>\u3010\u53c2\u8003\u3011Core Web Vitals \u306e\u6307\u6a19 LCP \u3068\u306f\uff1f\u6982\u8981\u304b\u3089\u6539\u5584\u65b9\u6cd5\u307e\u3067\u89e3\u8aac<br><a href=\"https:\/\/fastest.jp\/blog\/largest-contentful-paint\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/fastest.jp\/blog\/largest-contentful-paint\/<\/a><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">First Input Delay\uff08FID\uff09<\/h4>\n\n\n\n<p>FID \u3068\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304c Web \u30da\u30fc\u30b8\u4e0a\u3067\u521d\u3081\u3066\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u884c\u3063\u305f\u3068\u304d\u306b\u3001\u30d6\u30e9\u30a6\u30b6\u304c\u5fdc\u7b54\u3059\u308b\u307e\u3067\u306b\u304b\u304b\u308b\u6642\u9593\u306e\u3053\u3068\u3067\u3059\u3002<br>FID \u306f LCP \u3068\u540c\u69d8\u306b Core Web Vitals \u306e\u3072\u3068\u3064\u3067\u3059\u3002<\/p>\n\n\n\n<p>FID \u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u65b9\u306f\u3001\u4ee5\u4e0b\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<br>\u3010\u53c2\u8003\u3011Core Web Vitals \u306e\u6307\u6a19 FID \u3068\u306f\uff1f\u6982\u8981\u304b\u3089\u6539\u5584\u65b9\u6cd5\u307e\u3067\u89e3\u8aac<br><a href=\"https:\/\/fastest.jp\/blog\/first-input-delay\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/fastest.jp\/blog\/first-input-delay\/<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u5b9a\u7fa9<\/h3>\n\n\n\n<p>\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u3068\u306f\u3001Web \u30da\u30fc\u30b8\u306b\u542b\u307e\u308c\u3066\u3044\u308b\u3082\u306e\u306e\u3001\u305d\u306e\u30da\u30fc\u30b8\u306e\u8aad\u307f\u8fbc\u307f\u3084\u64cd\u4f5c\u6642\u306b\u306f\u5b9f\u884c\u3055\u308c\u306a\u3044 JavaScript \u306e\u30b3\u30fc\u30c9\u3092\u6307\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>Web \u30b5\u30a4\u30c8\u306e\u8a55\u4fa1\u3092\u8a3a\u65ad\u3059\u308b\u30c4\u30fc\u30eb\u306b Lighthouse \u304c\u3042\u308a\u307e\u3059\u3002<br>Lighthouse \u306f\u300120\u30ad\u30d3\u30d0\u30a4\u30c8\u3092\u8d85\u3048\u308b\u672a\u4f7f\u7528\u306e\u30b3\u30fc\u30c9\u3092\u542b\u3080\u3059\u3079\u3066\u306e JavaScript \u30d5\u30a1\u30a4\u30eb\u306b\u30d5\u30e9\u30b0\u3092\u7acb\u3066\u307e\u3059\u3002<br>\u3053\u306e\u30d5\u30e9\u30b0\u3092\u7acb\u3066\u3089\u308c\u305f JavaScript \u30d5\u30a1\u30a4\u30eb\u306b\u3042\u308b\u672a\u4f7f\u7528\u306e\u30b3\u30fc\u30c9\u304c\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30ad\u30d3\u30d0\u30a4\u30c8\uff08 kibibyte \uff09 \u3068\u306f\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u306e\u5bb9\u91cf\u3084\u8a18\u61b6\u88c5\u7f6e\u306e\u5927\u304d\u3055\u3092\u3042\u3089\u308f\u3059\u5358\u4f4d\u306e\u4e00\u3064\u3067\u3059\u3002<br>1\u30ad\u30d3\u30d0\u30a4\u30c8\u306f1024\u30d0\u30a4\u30c8\u306b\u76f8\u5f53\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u78ba\u8a8d\u65b9\u6cd5<\/h2>\n\n\n\n<p>\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u78ba\u8a8d\u65b9\u6cd5\u306b\u306f\u4ee5\u4e0b\u306e2\u3064\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30fbPageSpeed Insights<br>\u30fbDeveloperTools<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">PageSpeed Insights\u3067\u306e\u78ba\u8a8d\u65b9\u6cd5<\/h3>\n\n\n\n<p><a href=\"https:\/\/pagespeed.web.dev\/?hl=ja\" target=\"_blank\" rel=\"noreferrer noopener\">PageSpeed Insights<\/a> \u306f\u3001Web \u30b5\u30a4\u30c8\u306e\u30da\u30fc\u30b8\u306e\u8868\u793a\u901f\u5ea6\u306e\u6e2c\u5b9a\u3084\u6539\u5584\u70b9\u3092\u628a\u63e1\u3067\u304d\u308b\u30c4\u30fc\u30eb\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306f PageSpeed Insights \u306e\u6539\u5584\u3067\u304d\u308b\u9805\u76ee\u3067\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full img-border is-style-twentytwentyone-border\"><img loading=\"lazy\" decoding=\"async\" width=\"765\" height=\"566\" src=\"https:\/\/storage.fastest.jp\/2023\/12\/java1.png\" alt=\"PageSpeed Insights\u306e\u6539\u5584\u3067\u304d\u308b\u9805\u76ee\u5185\u306b\u3042\u308b\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\" class=\"wp-image-631\" srcset=\"https:\/\/storage.fastest.jp\/2023\/12\/java1.png 765w, https:\/\/storage.fastest.jp\/2023\/12\/java1-300x222.png 300w\" sizes=\"auto, (max-width: 765px) 100vw, 765px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Developer Tools \u3067\u306e\u78ba\u8a8d\u65b9\u6cd5<\/h3>\n\n\n\n<p>Devekoper Tools \u3067\u3082\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u624b\u9806\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<p>1.Chrome DevTools \u3092\u958b\u304d\u3001\u300c\ufe19\u300d\u3092\u30af\u30ea\u30c3\u30af\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-style-twentytwentyone-border\"><img loading=\"lazy\" decoding=\"async\" width=\"1015\" height=\"428\" src=\"https:\/\/storage.fastest.jp\/2023\/12\/62b4dc2590fb2e346c625578d299dc80.png\" alt=\"Chrome DevTools\u3067\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u3092\u7279\u5b9a\u3059\u308b\u30b9\u30c6\u30c3\u30d71\" class=\"wp-image-637\" srcset=\"https:\/\/storage.fastest.jp\/2023\/12\/62b4dc2590fb2e346c625578d299dc80.png 1015w, https:\/\/storage.fastest.jp\/2023\/12\/62b4dc2590fb2e346c625578d299dc80-300x127.png 300w, https:\/\/storage.fastest.jp\/2023\/12\/62b4dc2590fb2e346c625578d299dc80-768x324.png 768w\" sizes=\"auto, (max-width: 1015px) 100vw, 1015px\" \/><\/figure>\n\n\n\n<p>2.Coverage \u3092\u9078\u629e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-style-twentytwentyone-border\"><img loading=\"lazy\" decoding=\"async\" width=\"845\" height=\"832\" src=\"https:\/\/storage.fastest.jp\/2023\/12\/81cc1bdecb169d9b40ce80803266167e.png\" alt=\"Chrome DevTools\u3067\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u3092\u7279\u5b9a\u3059\u308b\u30b9\u30c6\u30c3\u30d72\" class=\"wp-image-638\" srcset=\"https:\/\/storage.fastest.jp\/2023\/12\/81cc1bdecb169d9b40ce80803266167e.png 845w, https:\/\/storage.fastest.jp\/2023\/12\/81cc1bdecb169d9b40ce80803266167e-300x295.png 300w, https:\/\/storage.fastest.jp\/2023\/12\/81cc1bdecb169d9b40ce80803266167e-768x756.png 768w\" sizes=\"auto, (max-width: 845px) 100vw, 845px\" \/><\/figure>\n\n\n\n<p>3.\u5206\u6790\u3055\u308c\u305f\u30ea\u30bd\u30fc\u30b9\u3068\u30ea\u30bd\u30fc\u30b9\u5185\u3067\u4f7f\u7528\u3055\u308c\u308b\u30b3\u30fc\u30c9\u306e\u91cf\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-style-twentytwentyone-border\"><img loading=\"lazy\" decoding=\"async\" width=\"991\" height=\"536\" src=\"https:\/\/storage.fastest.jp\/2023\/12\/image-1.png\" alt=\"Chrome DevTools\u3067\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u3092\u7279\u5b9a\u3059\u308b\u30b9\u30c6\u30c3\u30d73\" class=\"wp-image-632\" srcset=\"https:\/\/storage.fastest.jp\/2023\/12\/image-1.png 991w, https:\/\/storage.fastest.jp\/2023\/12\/image-1-300x162.png 300w, https:\/\/storage.fastest.jp\/2023\/12\/image-1-768x415.png 768w\" sizes=\"auto, (max-width: 991px) 100vw, 991px\" \/><\/figure>\n\n\n\n<p>\u5404\u884c\u306f\u73fe\u5728\u306e\u30da\u30fc\u30b8\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b JavaScript \u3084 CSS \u306e URL \u3068 URL \u5185\u306e\u30b3\u30fc\u30c9\u304c\u3069\u308c\u304f\u3089\u3044\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u8868\u3057\u3066\u3044\u307e\u3059\u3002<br>\u9752\u8272\u306e\u30d0\u30fc\u304c\u5168\u4f53\u306e\u3046\u3061\u4f7f\u7528\u3057\u3066\u3044\u308b\u30b3\u30fc\u30c9\u306e\u5272\u5408\u3067\u3001\u8d64\u8272\u306e\u30d0\u30fc\u304c\u672a\u4f7f\u7528\u306e\u30b3\u30fc\u30c9\u306e\u5272\u5408\u3067\u3059\u3002<br>\u30d0\u30fc\u304c\u9577\u304f\u3001\u8d64\u8272\u306e\u5272\u5408\u304c\u5927\u304d\u3044\u3082\u306e\u306f\u512a\u5148\u3057\u3066\u524a\u6e1b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u65b9\u6cd5<\/h2>\n\n\n\n<p>\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u65b9\u6cd5\u306f\u4ee5\u4e0b\u306e3\u3064\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30fb\u76f4\u63a5\u524a\u6e1b\u3059\u308b<br>\u30fbWordPress \u306e\u30d7\u30e9\u30b0\u30a4\u30f3\u3067\u524a\u6e1b\u3059\u308b<br>\u30fb\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u30c4\u30fc\u30eb\u3067\u524a\u6e1b\u3059\u308b<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u76f4\u63a5\u524a\u6e1b\u3059\u308b<\/h3>\n\n\n\n<p>JavaScript \u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u78ba\u8a8d\u3057\u3001\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044\u30b3\u30fc\u30c9\u3092\u76f4\u63a5\u524a\u6e1b\u3057\u307e\u3059\u3002<br>\u3053\u306e\u65b9\u6cd5\u306f\u30c4\u30fc\u30eb\u306e\u5c0e\u5165\u3092\u5fc5\u8981\u3068\u3057\u307e\u305b\u3093\u304c\u3001\u3042\u308b\u7a0b\u5ea6\u306e\u30b3\u30fc\u30c9\u306e\u77e5\u8b58\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002<br>\u76f4\u63a5\u524a\u6e1b\u3059\u308b\u3053\u3068\u306b\u4e0d\u5b89\u304c\u3042\u308b\u65b9\u306f\u5f8c\u8ff0\u3059\u308b\u65b9\u6cd5\u3092\u304a\u8a66\u3057\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">WordPress \u306e\u30d7\u30e9\u30b0\u30a4\u30f3\u3067\u524a\u6e1b\u3059\u308b<\/h3>\n\n\n\n<p>\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u306f WordPress \u306e\u30d7\u30e9\u30b0\u30a4\u30f3\u3067\u3042\u308b <a href=\"https:\/\/ja.wordpress.org\/plugins\/flying-scripts\/\" target=\"_blank\" rel=\"noreferrer noopener\">Flying Scripts by WP Speed Matters<\/a> \u3067\u7c21\u5358\u306b\u524a\u6e1b\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-twentytwentyone-border\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"541\" src=\"https:\/\/storage.fastest.jp\/2023\/12\/image-2-1024x541.png\" alt=\" Flying Scripts by WP Speed Matters\" class=\"wp-image-633\" srcset=\"https:\/\/storage.fastest.jp\/2023\/12\/image-2-1024x541.png 1024w, https:\/\/storage.fastest.jp\/2023\/12\/image-2-300x159.png 300w, https:\/\/storage.fastest.jp\/2023\/12\/image-2-768x406.png 768w, https:\/\/storage.fastest.jp\/2023\/12\/image-2.png 1095w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Flying Script \u3092\u8d77\u52d5\u3057\u3001Including Keywords \u306e\u6b04\u306b PageSpeed Insights \u306e\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u306b\u3042\u308b JavaScript \u30d5\u30a1\u30a4\u30eb\u306e URL \u3092\u30b3\u30d4\u30fc\u3057\u3066\u8cbc\u308a\u4ed8\u3051\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-style-twentytwentyone-border\"><img loading=\"lazy\" decoding=\"async\" width=\"749\" height=\"335\" src=\"https:\/\/storage.fastest.jp\/2023\/12\/java2.png\" alt=\"\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306eURL\" class=\"wp-image-634\" srcset=\"https:\/\/storage.fastest.jp\/2023\/12\/java2.png 749w, https:\/\/storage.fastest.jp\/2023\/12\/java2-300x134.png 300w\" sizes=\"auto, (max-width: 749px) 100vw, 749px\" \/><\/figure>\n\n\n\n<p>Save Changes \u306e\u30dc\u30bf\u30f3\u3092\u62bc\u3059\u3053\u3068\u3067\u3001\u8a2d\u5b9a\u304c\u5b8c\u4e86\u3057\u3001\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u3092\u524a\u6e1b\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u30c4\u30fc\u30eb\u3067\u524a\u6e1b\u3059\u308b<\/h3>\n\n\n\n<p>\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u306e\u64cd\u4f5c\u306b\u6163\u308c\u3066\u3044\u308b\u65b9\u306f\u3001\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u30c4\u30fc\u30eb\u3067\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<p>JavaScript \u306e\u524a\u6e1b\u306b\u306f\u300cterser\u300d\u3068\u3044\u3046\u30b3\u30de\u30f3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<br>\u307e\u305a\u306f npm \u3067 terser \u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>npm install terser -g<\/code><\/pre>\n\n\n\n<p>\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u305f\u5f8c\u3001\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3092\u6253\u3064\u3060\u3051\u3067\u7c21\u5358\u306b\u30d5\u30a1\u30a4\u30eb\u3092\u5727\u7e2e\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>terser -c -m -o {\u30a2\u30a6\u30c8\u30d7\u30c3\u30c8\u30d5\u30a1\u30a4\u30eb\u540d} -- {\u30a4\u30f3\u30d7\u30c3\u30c8\u5148\u30d5\u30a1\u30a4\u30eb\u540d}<\/code><\/pre>\n\n\n\n<p>-c \u306f\u5727\u7e2e\u3059\u308b\u3001-m \u306f\u95a2\u6570\u540d\u306a\u3069\u306e\u540d\u524d\u3092\u7c21\u5358\u306a\u3082\u306e\u306b\u5909\u63db\u3059\u308b\u3001-o \u306f\u30a2\u30a6\u30c8\u30d7\u30c3\u30c8\u5148\u3092\u6307\u5b9a\u3059\u308b\u30aa\u30d7\u30b7\u30e7\u30f3\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u305d\u306e\u4ed6\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u306b\u3064\u3044\u3066\u306f\u516c\u5f0f\u30b5\u30a4\u30c8\u3067\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<br>\u3010\u53c2\u8003\u3011terser -npm<br><a href=\"https:\/\/www.npmjs.com\/package\/terser\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.npmjs.com\/package\/terser<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n\n\n\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u3001\u300c\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u300d\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u300c\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u300d\u306f\u3001\u8868\u793a\u901f\u5ea6\u306e\u6539\u5584\u306b\u5f79\u7acb\u3064\u65bd\u7b56\u3067\u3059\u3002<\/p>\n\n\n\n<p>JavaScript \u3092\u524a\u6e1b\u3059\u308b\u305f\u3081\u306b\u306f\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306e\u77e5\u8b58\u304c\u5fc5\u8981\u3060\u3068\u8003\u3048\u3066\u3044\u308b\u65b9\u3082\u3044\u308b\u3068\u601d\u3044\u307e\u3059\u3002<br>\u3057\u304b\u3057\u3001\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306e\u77e5\u8b58\u304c\u7121\u304f\u3066\u3082 WordPress \u306e\u30d7\u30e9\u30b0\u30a4\u30f3\u3084\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u30c4\u30fc\u30eb\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u7c21\u5358\u306b\u524a\u6e1b\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u305f\u3060\u3057\u3001\u300c\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u300d\u3092\u3057\u305f\u7d50\u679c\u6b63\u3057\u304f\u52d5\u4f5c\u3057\u306a\u304f\u306a\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u306e\u3067\u3001\u524a\u6e1b\u3059\u308b\u5834\u5408\u306f\u4e0d\u5177\u5408\u304c\u751f\u3058\u3066\u3044\u306a\u3044\u304b\u78ba\u8a8d\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u300c\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u300d\u3092\u884c\u3044\u3001Web \u30da\u30fc\u30b8\u306e\u8868\u793a\u901f\u5ea6\u3092\u6539\u5584\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<p>\u306a\u304a\u3001\u5f53\u793e\u3067\u306f\u30da\u30fc\u30b8\u306e\u8868\u793a\u901f\u5ea6\u306e\u6539\u5584\u30921\u30af\u30ea\u30c3\u30af\u3067\u884c\u3048\u308b\u30e9\u30f3\u30c7\u30a3\u30f3\u30b0\u30da\u30fc\u30b8\u9ad8\u901f\u5316\u30c4\u30fc\u30eb FasTest\uff08\u30d5\u30a1\u30fc\u30b9\u30c6\u30b9\u30c8\uff09 \u3092\u958b\u767a\u30fb\u8ca9\u58f2\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u7121\u6599\u30c8\u30e9\u30a4\u30a2\u30eb\u3082\u5b9f\u65bd\u3057\u3066\u304a\u308a\u307e\u3059\u306e\u3067\u3001\u3054\u8208\u5473\u306e\u3042\u308b\u65b9\u306f\u305c\u3072\u304a\u6c17\u8efd\u306b\u304a\u554f\u3044\u5408\u308f\u305b\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n<div class=\"fastest-button\">\n  <a\n    class=\"cta-button cta-button--primary-color cta-button--m-size\"\n    href=\"https:\/\/fastest.jp\/trial\/\"\n    target=\"_blank\"\n  >\n    \u7121\u6599\u30c8\u30e9\u30a4\u30a2\u30eb\u306f\u3053\u3061\u3089  <\/a>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u300c\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u300d\u306f Google \u304c\u63d0\u4f9b\u3059\u308b PageSpeed Insights \u306e\u6539\u5584\u9805\u76ee\u306e\u3072\u3068\u3064\u3067\u3059\u3002 \u3057\u304b\u3057\u3001\u6539\u5584\u6848\u3068\u3057\u3066\u51fa\u3066\u304d\u305f\u3082\u306e\u306e JavaScript \u306b\u95a2\u3059\u308b\u77e5\u8b58\u304c\u306a\u304f\u3001&hellip; <a class=\"more-link\" href=\"https:\/\/fastest.jp\/blog\/reduce-unused-javascript\/\">\u7d9a\u304d\u3092\u8aad\u3080 <span class=\"screen-reader-text\">\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044 JavaScript \u306e\u524a\u6e1b\u3068\u306f\uff1f\u6982\u8981\u304b\u3089\u6539\u5584\u65b9\u6cd5\u307e\u3067\u89e3\u8aac<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":636,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-629","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-page-speed","entry"],"acf":[],"_links":{"self":[{"href":"https:\/\/fastest.jp\/blog\/wp-json\/wp\/v2\/posts\/629","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fastest.jp\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fastest.jp\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fastest.jp\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fastest.jp\/blog\/wp-json\/wp\/v2\/comments?post=629"}],"version-history":[{"count":4,"href":"https:\/\/fastest.jp\/blog\/wp-json\/wp\/v2\/posts\/629\/revisions"}],"predecessor-version":[{"id":641,"href":"https:\/\/fastest.jp\/blog\/wp-json\/wp\/v2\/posts\/629\/revisions\/641"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/fastest.jp\/blog\/wp-json\/wp\/v2\/media\/636"}],"wp:attachment":[{"href":"https:\/\/fastest.jp\/blog\/wp-json\/wp\/v2\/media?parent=629"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fastest.jp\/blog\/wp-json\/wp\/v2\/categories?post=629"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fastest.jp\/blog\/wp-json\/wp\/v2\/tags?post=629"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}