{"id":18681,"date":"2021-01-25T19:29:06","date_gmt":"2021-01-25T12:29:06","guid":{"rendered":"https:\/\/speed.family\/?p=18681"},"modified":"2021-01-25T19:29:06","modified_gmt":"2021-01-25T12:29:06","slug":"toi-uu-js-wordpress","status":"publish","type":"post","link":"https:\/\/kiencang.net\/toi-uu-js-wordpress\/","title":{"rendered":"C\u00e1c t\u00f9y ch\u1ecdn t\u1ed1i \u01b0u h\u00f3a JS tr\u00ean trang WordPress trong th\u1ef1c t\u1ebf"},"content":{"rendered":"\n<p>WordPress l\u00e0 h\u1ec7 th\u1ed1ng m\u1edf \u0111i\u1ec1u \u0111\u00f3 gi\u00fap CMS n\u00e0y c\u00f3 v\u00f4 s\u1ed1 theme &amp; plugin h\u1ed7 tr\u1ee3 thu\u1eadn l\u1ee3i cho ng\u01b0\u1eddi d\u00f9ng. Tuy nhi\u00ean n\u00f3 c\u0169ng t\u1ea1o ra nh\u01b0\u1ee3c \u0111i\u1ec3m l\u00e0 c\u00e1c thi\u1ebft k\u1ebf b\u00ean trong c\u00f3 th\u1ec3 ch\u01b0a t\u1ed1i \u01b0u.<\/p>\n\n\n<p>C\u00e1c&nbsp;l\u1eddi khuy\u00ean v\u1ec1 t\u1ed1i \u01b0u t\u1ed1c \u0111\u1ed9, hi\u1ec7u su\u1ea5t cho JS tr\u01b0\u1edbc \u0111\u00e2y&nbsp;th\u01b0\u1eddng khuy\u00ean ch\u00fang ta g\u1ed9p c\u00e1c file JS tr\u00ean to\u00e0n trang th\u00e0nh m\u1ed9t file duy nh\u1ea5t v\u00e0 minify (gi\u1ea3m thi\u1ec3u k\u00edch c\u1ee1) c\u1ee7a n\u00f3. Nh\u01b0ng \u0111i\u1ec1u \u0111\u00f3 s\u1ebd kh\u00f4ng c\u00f2n l\u00e0 c\u00e1ch t\u1ed1i \u01b0u nh\u1ea5t hi\u1ec7n nay khi c\u00e1c file JS c\u00f3 kh\u1ea3 n\u0103ng t\u1ea3i song song nh\u1edd http\/2, trang th\u01b0\u1eddng xuy\u00ean c\u1eadp nh\u1eadt &amp; t\u1ea7m m\u1ee9c quan tr\u1ecdng c\u1ee7a&nbsp;<a href=\"https:\/\/kiencang.net\/bo-nho-dem-trinh-duyet\/\" target=\"_blank\" rel=\"noreferrer noopener\">cache tr\u00ecnh duy\u1ec7t<\/a>&nbsp;tr\u00ean c\u00e1c trang th\u01b0\u1eddng xuy\u00ean c\u00f3 ng\u01b0\u1eddi d\u00f9ng quay tr\u1edf l\u1ea1i.<\/p>\n\n\n<p>Trong b\u00e0i vi\u1ebft n\u00e0y t\u00f4i s\u1ebd ch\u1ec9 ra v\u00e0i th\u1ef1c h\u00e0nh c\u00f3 l\u1ee3i h\u01a1n tr\u00ean nhi\u1ec1u website:<\/p>\n\n\n<ul><li><strong>Ch\u1ecdn theme t\u1ed1i \u01b0u t\u1ed1c \u0111\u1ed9 s\u1eb5n ho\u1eb7c \u0111\u01b0\u1ee3c vi\u1ebft m\u00e3 t\u1ed1t<\/strong>: c\u00e1c theme n\u00e0y ngay t\u1eeb \u0111\u1ea7u s\u1ebd c\u00f3 JS t\u1ed1i \u01b0u cho b\u1ea1n r\u1ed3i. C\u00e1c r\u1eafc r\u1ed1i JS t\u1eeb theme kh\u00f4ng h\u1ec1 nh\u1ecf n\u00ean b\u1ea1n ph\u1ea3i c\u00e2n nh\u1eafc \u0111i\u1ec1u n\u00e0y. Khi d\u00f9ng web m\u1ed9t th\u1eddi gian t\u01b0\u01a1ng \u0111\u1ed1i d\u00e0i, vi\u1ec7c \u0111\u1ed5i theme s\u1ebd ph\u1ee9c t\u1ea1p h\u01a1n so v\u1edbi \u0111\u1ed5i m\u1ed9t plugin n\u00e0o \u0111\u00f3 r\u1ea5t nhi\u1ec1u. N\u1ebfu theme kh\u00f4ng t\u1ed1t, vi\u1ec7c ch\u1ec9nh s\u1eeda JS c\u1ee7a n\u00f3 c\u1ea7n k\u1ef9 n\u0103ng t\u1ed1t m\u00e0 kh\u00f4ng ph\u1ea3i ng\u01b0\u1eddi qu\u1ea3n tr\u1ecb web n\u00e0o c\u0169ng l\u00e0m \u0111\u01b0\u1ee3c &amp; \u0111\u00f4i khi vi\u1ec7c ch\u1ec9nh s\u1eeda l\u00e0 b\u1ea5t kh\u1ea3 thi ngay c\u1ea3 khi b\u1ea1n c\u00f3 k\u1ef9 n\u0103ng t\u1ed1t;<\/li><li><strong>Ch\u1ecdn plugin ch\u1ea5t l\u01b0\u1ee3ng<\/strong>: nh\u1eefng plugin n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c vi\u1ebft t\u1ed1t h\u01a1n. Hi\u1ec7u su\u1ea5t l\u00e0 m\u1ed9t ti\u00eau ch\u00ed quan tr\u1ecdng trong c\u00e1c plugin ch\u1ea5t l\u01b0\u1ee3ng cao. Xem th\u00eam: <a href=\"https:\/\/kiencang.net\/dich-vu-wordpress-yeu-thich\/\" target=\"_blank\" rel=\"noreferrer noopener\">c\u00e1c plugin \u01b0a th\u00edch c\u1ee7a Ki\u1ebfn c\u00e0ng<\/a>;<\/li><li><strong>Kh\u00f4ng g\u1ed9p c\u00e1c file JS ngo\u00e0i<\/strong>: trong nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p \u0111\u1ec3 c\u00e1c file JS t\u00e1ch ri\u00eang v\u00e0 kh\u00f4ng g\u1ed9p ch\u00fang s\u1ebd t\u1ed1t h\u01a1n. C\u00f3 hai l\u1ee3i \u00edch c\u0103n b\u1ea3n: (1) t\u1ed1c \u0111\u1ed9 t\u1ea1o m\u1edbi cache HTML khi ng\u01b0\u1eddi d\u00f9ng truy c\u1eadp, <a href=\"https:\/\/kiencang.net\/preload-cache-broken-link-checker\/\" target=\"_blank\" rel=\"noreferrer noopener\">preload cache nhanh h\u01a1n h\u1eb3n<\/a> do plugin cache kh\u00f4ng ph\u1ea3i m\u1ea5t th\u1eddi gian t\u1ed5ng h\u1ee3p l\u1ea1i JS. (2) vi\u1ec7c c\u00e1c file JS kh\u00f4ng thay \u0111\u1ed5i t\u00ean, kh\u00f4ng ph\u1ea3i t\u1ea1o file t\u1ed5ng h\u1ee3p m\u1edbi khi b\u1ea1n ch\u1ec9 c\u00f3 m\u1ed9t ch\u1ec9nh s\u1eeda nh\u1ecf v\u1ec1 giao di\u1ec7n tr\u00ean to\u00e0n trang (v\u00ed d\u1ee5 nh\u01b0 c\u00e0i th\u00eam plugin) c\u00f3 th\u1ec3 gi\u00fap \u0111a s\u1ed1 c\u00e1c file JS \u0111\u00e3 \u0111\u01b0\u1ee3c cache s\u1eb5n tr\u00ean tr\u00ecnh duy\u1ec7t c\u1ee7a ng\u01b0\u1eddi d\u00f9ng \u0111\u00e3 t\u1eebng v\u00e0o website tr\u01b0\u1edbc \u0111\u00e2y;<\/li><li><strong>Minify kh\u00f4ng c\u00f3 t\u00e1c d\u1ee5ng \u0111\u00e1ng k\u1ec3<\/strong>:\u00a0gi\u1ea3m m\u1ed9t v\u00e0i KB trong file JS kh\u00f4ng c\u00f3 t\u00e1c d\u1ee5ng \u0111\u00e1ng k\u1ec3 trong vi\u1ec7c t\u0103ng t\u1ed1c \u0111\u1ed9 trang, so v\u1edbi b\u1ea5t l\u1ee3i m\u00e0 n\u00f3 ph\u1ea3i nh\u1eadn gi\u1ed1ng nh\u01b0 khi g\u1ed9p JS ngo\u00e0i;<\/li><li><strong>Kh\u00f4ng g\u1ed9p JS n\u1ed9i tuy\u1ebfn<\/strong>: tr\u00ean c\u00e1c theme v\u00e0 plugin \u0111\u01b0\u1ee3c vi\u1ebft m\u00e3 t\u1ed1t, JS n\u1ed9i tuy\u1ebfn th\u01b0\u1eddng l\u00e0 ch\u1ee7 \u0111\u1ed9ng th\u00eam v\u00e0o \u0111\u1ec3 t\u1ed1i \u01b0u cho trang, vi\u1ec7c g\u1ed9p ch\u00fang th\u00e0nh file ngo\u00e0i c\u00f3 th\u1ec3 l\u00e0m trang ch\u1eadm \u0111i;<\/li><li><strong>T\u1ea1o JS c\u1ee5c b\u1ed9 cho c\u00e1c JS c\u1ee7a b\u00ean th\u1ee9 ba c\u00f3 th\u1ec3 \u0111em l\u1ea1i t\u00e1c \u0111\u1ed9ng l\u1edbn<\/strong>: JS c\u1ee7a b\u00ean th\u1ee9 ba c\u00f3 th\u1ec3 c\u00f3 nh\u1eefng \u1ea3nh h\u01b0\u1edfng r\u1ea5t nghi\u00eam tr\u1ecdng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 trang, v\u00ed d\u1ee5 nh\u01b0 c\u00e1c m\u00e3 JS c\u1ee7a YouTube, Facebook, c\u00e1c m\u00e3 Analytics, v\u00e2n v\u00e2n. Nguy\u00ean nh\u00e2n l\u00e0 v\u00ec n\u00f3 th\u01b0\u1eddng y\u00eau c\u1ea7u t\u1ea3i s\u1edbm (g\u00e2y ch\u1eb7n hi\u1ec3n), v\u00e0 th\u1eddi gian cache tr\u00ecnh\u00a0duy\u1ec7t ng\u1eafn (th\u01b0\u1eddng l\u00e0 d\u01b0\u1edbi 7 ng\u00e0y). C\u00f3 hai c\u00e1ch kh\u1eafc ph\u1ee5c ch\u00ednh: (1) b\u1ea1n localhost c\u00e1c file JS b\u00ean ngo\u00e0i, qua \u0111\u00f3 b\u1ea1n c\u00f3 kh\u1ea3 n\u0103ng ch\u1ee7 \u0111\u1ed9ng <a href=\"https:\/\/kiencang.net\/tai-javascript-defer-async\/\" target=\"_blank\" rel=\"noreferrer noopener\">defer JS<\/a> v\u00e0 thay \u0111\u1ed5i th\u1eddi gian cache tr\u00ecnh duy\u1ec7t c\u1ee7a n\u00f3; (2) b\u1ea1n s\u1eed d\u1ee5ng c\u00e1c plugin c\u00f3 kh\u1ea3 n\u0103ng tr\u00ec ho\u00e3n JS sau m\u1ed9t kho\u1ea3ng th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh ho\u1eb7c khi c\u00f3 t\u01b0\u01a1ng t\u00e1c c\u1ee7a ng\u01b0\u1eddi d\u00f9ng m\u1edbi t\u1ea3i, <a href=\"https:\/\/kiencang.net\/gioi-thieu-pluign-flying-scripts\/\" target=\"_blank\" rel=\"noreferrer noopener\">plugin t\u1ed1t \u0111\u1ec3 h\u1ed7 tr\u1ee3 b\u1ea1n l\u00e0m \u0111i\u1ec1u n\u00e0y l\u00e0 Flying Scripts<\/a>. Plugin n\u00e0y c\u00f2n c\u00f3 kh\u1ea3 n\u0103ng gi\u00fap b\u1ea1n tr\u00e1nh l\u1ed7i th\u1eddi gian th\u1ef1c thi JS qu\u00e1 l\u1edbn;<\/li><li><strong>Th\u1eed defer jQuery<\/strong>: th\u01b0\u1eddng ch\u00fang ta s\u1ebd kh\u00f4ng defer jQuery \u0111\u1ec3 ph\u00f2ng \u0111o\u1ea1n m\u00e3 n\u00e0y \u0111\u01b0\u1ee3c d\u00f9ng s\u1edbm trong qu\u00e1 tr\u00ecnh t\u1ea3i trang. Tuy nhi\u00ean m\u1ed9t s\u1ed1 trang b\u1ea1n c\u1ee9 th\u1eed xem c\u00f3 \u0111\u01b0\u1ee3c kh\u00f4ng v\u00ec n\u1ebfu \u0111\u01b0\u1ee3c t\u1ed1c \u0111\u1ed9 c\u1ea3i thi\u1ec7n s\u1ebd \u0111\u00e1ng k\u1ec3.<\/li><li><strong>Lo\u1ea1i b\u1ecf JS kh\u00f4ng s\u1eed d\u1ee5ng<\/strong>:\u00a0JS kh\u00f4ng s\u1eed d\u1ee5ng\u00a0kh\u00f3 lo\u1ea1i b\u1ecf h\u01a1n nhi\u1ec1u. Hi\u1ec7n kh\u00f4ng nhi\u1ec1u plugin cache x\u1eed l\u00fd t\u1ed1t v\u1ea5n \u0111\u1ec1 n\u00e0y, c\u00e1c d\u1ecbch v\u1ee5 c\u00f3 ph\u00ed th\u00ec th\u01b0\u1eddng c\u00f3 gi\u00e1 cao. \u0110\u1ec3 x\u1eed l\u00fd c\u00e1i n\u00e0y m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 th\u00ec b\u1ea1n n\u00ean ch\u1ecdn theme v\u00e0 plugin ch\u1ea5t l\u01b0\u1ee3ng, v\u00ec \u0111\u00e2y l\u00e0 nguy\u00ean nh\u00e2n ch\u00ednh c\u1ee7a vi\u1ec7c ch\u00e8n JS v\u00f4 t\u1ed9i v\u1ea1. Ngo\u00e0i ra c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c plugin gi\u00fap lo\u1ea1i b\u1ecf JS kh\u00f4ng d\u00f9ng nh\u01b0\u00a0<a href=\"https:\/\/kiencang.net\/category\/perfmatters\/\" target=\"_blank\" rel=\"noreferrer noopener\">Perfmatters<\/a>\u00a0ho\u1eb7c\u00a0<a href=\"https:\/\/kiencang.net\/plugin-gonzales\/\" target=\"_blank\" rel=\"noreferrer noopener\">Gonzales<\/a>, d\u00f9 \u0111\u00e2y kh\u00f4ng ph\u1ea3i l\u00e0 bi\u1ec7n ph\u00e1p ho\u00e0n h\u1ea3o, v\u00ec n\u00f3 ch\u1ec9 lo\u1ea1i b\u1ecf JS kh\u00f4ng d\u00f9ng \u1edf d\u1ea1ng c\u1ea3 file, c\u00f2n JS kh\u00f4ng d\u00f9ng m\u00e0 n\u1eb1m m\u1ed9t ph\u1ea7n trong file (v\u00ed d\u1ee5 30% JS trong m\u1ed9t file n\u00e0o \u0111\u00f3 l\u00e0 kh\u00f4ng d\u00f9ng) th\u00ec n\u00f3 kh\u00f4ng lo\u1ea1i b\u1ecf \u0111\u01b0\u1ee3c (v\u00e0 theo t\u00f4i bi\u1ebft hi\u1ec7n c\u0169ng kh\u00f4ng c\u00f3 plugin n\u00e0o lo\u1ea1i b\u1ecf \u0111\u01b0\u1ee3c JS d\u01b0 m\u1ed9t ph\u1ea7n trong file);<\/li><li><strong>\u0110\u1ec3 th\u1eddi gian cache tr\u00ecnh duy\u1ec7t cho JS \u0111\u1ee7 l\u00e2u<\/strong>: 3 th\u00e1ng l\u00e0 \u0111\u01b0\u1ee3c, b\u1ea1n \u0111\u1ec3 l\u00e2u h\u01a1n c\u00e0ng t\u1ed1t (t\u00ecm hi\u1ec3u th\u00eam\u00a0<a href=\"https:\/\/kiencang.net\/http-caching-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">HTTP caching<\/a>). Ng\u00e0y nay c\u00e1c theme &amp; plugin \u0111\u1ec1u th\u00eam\u00a0<a href=\"https:\/\/kiencang.net\/css-wordpress-version\/\" target=\"_blank\" rel=\"noreferrer noopener\">query string \u0111\u1ec3 th\u1ec3 hi\u1ec7n c\u00e1c b\u1ea3n c\u1eadp nh\u1eadt cho file CSS, JS<\/a>\u00a0n\u00ean b\u1ea1n kh\u00f4ng lo v\u1ea5n \u0111\u1ec1 c\u00f3 c\u1eadp nh\u1eadt m\u00e0 trang l\u1ea1i s\u1eed d\u1ee5ng cache c\u0169 tr\u00ean tr\u00ecnh duy\u1ec7t c\u1ee7a kh\u00e1ch \u0111\u00e3 t\u1eebng gh\u00e9 th\u0103m tr\u01b0\u1edbc \u0111\u00e2y;<\/li><li><strong>B\u1eadt m\u00e3 ngu\u1ed3n c\u1ee7a trang, t\u1ea3i th\u1eed \u0111\u1ec3 xem c\u00e1c c\u00e0i \u0111\u1eb7t c\u00f3 nh\u01b0 \u00fd b\u1ea1n kh\u00f4ng<\/strong>: m\u1ed9t v\u00ed d\u1ee5 \u0111i\u1ec3n h\u00ecnh l\u00e0\u00a0<a href=\"https:\/\/kiencang.net\/browser-cache-ttl-trong-openlitespeed\/\" target=\"_blank\" rel=\"noreferrer noopener\">th\u1eddi gian cache ph\u00eda tr\u00ecnh duy\u1ec7t kh\u00f4ng \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp nh\u01b0 \u00fd th\u00f4ng qua plugin LiteSpeed cache tr\u00ean n\u1ec1n m\u00e1y ch\u1ee7 OpenLiteSpeed<\/a>\u00a0m\u00e0 r\u1ea5t nhi\u1ec1u ng\u01b0\u1eddi hi\u1ec7n \u0111ang d\u00f9ng.<\/li><\/ul>\n\n\n<p>L\u00e0m th\u1ebf n\u00e0o b\u1ea1n bi\u1ebft website c\u1ee7a b\u1ea1n c\u00f3 http\/2 hay kh\u00f4ng. B\u1ea1n ch\u1ec9 c\u1ea7n truy c\u1eadp v\u00e0o c\u00f4ng c\u1ee5 n\u00e0y \u0111\u1ec3 ki\u1ec3m tra:&nbsp;<a href=\"https:\/\/tools.keycdn.com\/http2-test\" target=\"_blank\" rel=\"noreferrer noopener\">tools.keycdn.com\/http2-test<\/a><\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\">V\u1eady t\u1ed5ng h\u1ee3p JS c\u00f3 l\u1ee3i trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p n\u00e0o?<\/h2>\n\n\n<p>N\u1ebfu r\u01a1i v\u00e0o \u0111\u1ed3ng th\u1eddi c\u00e1c tr\u01b0\u1eddng h\u1ee3p sau, vi\u1ec7c t\u1ed5ng h\u1ee3p JS th\u00e0nh m\u1ed9t file duy nh\u1ea5t c\u00f3 th\u1ec3 c\u00f3 l\u1ee3i h\u01a1n:<\/p>\n\n\n<ul><li>File JS t\u1ed5ng h\u1ee3p c\u00f3 dung l\u01b0\u1ee3ng kh\u00f4ng qu\u00e1 l\u1edbn, m\u1ed1c t\u1ed1t l\u00e0 d\u01b0\u1edbi 100KB;<\/li><li>Website c\u1ee7a b\u1ea1n l\u00e2u l\u00e2u m\u1edbi t\u00e1c \u0111\u1ed9ng khi\u1ebfn JS thay \u0111\u1ed5i, m\u1ed1c t\u1ed1t l\u00e0 1 th\u00e1ng.<\/li><\/ul>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<p>Cu\u1ed1i c\u00f9ng b\u1ea1n n\u00ean ki\u1ec3m tra c\u00e1c thi\u1ebft l\u1eadp c\u1ee7a m\u00ecnh, so s\u00e1nh n\u00f3 \u0111\u1ec3 bi\u1ebft c\u00e1c t\u00f9y ch\u1ecdn n\u00e0o l\u00e0 t\u1ed1t h\u01a1n, v\u00ec kh\u00f3 c\u00f3 t\u00f9y ch\u1ecdn n\u00e0o \u0111\u00fang trong m\u1ecdi tr\u01b0\u1eddng h\u1ee3p.<\/p>\n\n\n<p>PS: trang Ki\u1ebfn c\u00e0ng \u0111\u00e3 b\u1ecf g\u1ed9p &amp; minify CSS c\u0169ng nh\u01b0 JS.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>WordPress l\u00e0 h\u1ec7 th\u1ed1ng m\u1edf \u0111i\u1ec1u \u0111\u00f3 gi\u00fap CMS n\u00e0y c\u00f3 v\u00f4 s\u1ed1 theme &amp; plugin h\u1ed7 tr\u1ee3 thu\u1eadn l\u1ee3i cho ng\u01b0\u1eddi d\u00f9ng. Tuy nhi\u00ean n\u00f3 c\u0169ng t\u1ea1o ra nh\u01b0\u1ee3c \u0111i\u1ec3m l\u00e0 c\u00e1c thi\u1ebft k\u1ebf b\u00ean trong c\u00f3 th\u1ec3 ch\u01b0a t\u1ed1i \u01b0u. 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