{"id":11643,"date":"2019-02-10T10:29:40","date_gmt":"2019-02-10T10:29:40","guid":{"rendered":"https:\/\/www.ducanhplus.com\/?p=11643"},"modified":"2019-02-10T10:29:40","modified_gmt":"2019-02-10T10:29:40","slug":"javascript-chan-hien-thi","status":"publish","type":"post","link":"https:\/\/kiencang.net\/javascript-chan-hien-thi\/","title":{"rendered":"C\u00e1ch lo\u1ea1i b\u1ecf JavaScript ch\u1eb7n hi\u1ec3n th\u1ecb"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_60 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >M\u1ee5c l\u1ee5c<\/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\" role=\"button\"><label for=\"item-6577d6c3c7427\" ><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><\/label><input aria-label=\"Toggle\" aria-label=\"item-6577d6c3c7427\"  type=\"checkbox\" id=\"item-6577d6c3c7427\"><\/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:\/\/kiencang.net\/javascript-chan-hien-thi\/#Chan_hien_thi_render_nghia_la_gi\" title=\"Ch\u1eb7n hi\u1ec3n th\u1ecb (render) ngh\u0129a l\u00e0 g\u00ec\">Ch\u1eb7n hi\u1ec3n th\u1ecb (render) ngh\u0129a l\u00e0 g\u00ec<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kiencang.net\/javascript-chan-hien-thi\/#JavaScript_chan_hien_thi\" title=\"JavaScript ch\u1eb7n hi\u1ec3n th\u1ecb\">JavaScript ch\u1eb7n hi\u1ec3n th\u1ecb<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kiencang.net\/javascript-chan-hien-thi\/#Lam_the_nao_de_xac_dinh_duoc_JavaScript_chan_hien_thi\" title=\"L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c JavaScript ch\u1eb7n hi\u1ec3n th\u1ecb\">L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c JavaScript ch\u1eb7n hi\u1ec3n th\u1ecb<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kiencang.net\/javascript-chan-hien-thi\/#Lam_the_nao_de_loai_bo_JavaScript_chan_hien_thi\" title=\"L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 lo\u1ea1i b\u1ecf JavaScript ch\u1eb7n hi\u1ec3n th\u1ecb\">L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 lo\u1ea1i b\u1ecf JavaScript ch\u1eb7n hi\u1ec3n th\u1ecb<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/kiencang.net\/javascript-chan-hien-thi\/#Giai_phap_khong_hoan_chinh_thuong_duoc_su_dung\" title=\"Gi\u1ea3i ph\u00e1p kh\u00f4ng ho\u00e0n ch\u1ec9nh th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng\">Gi\u1ea3i ph\u00e1p kh\u00f4ng ho\u00e0n ch\u1ec9nh th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/kiencang.net\/javascript-chan-hien-thi\/#Giai_phap_thuc_sutot_hon\" title=\"Gi\u1ea3i ph\u00e1p th\u1ef1c s\u1ef1\/t\u1ed1t h\u01a1n\">Gi\u1ea3i ph\u00e1p th\u1ef1c s\u1ef1\/t\u1ed1t h\u01a1n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/kiencang.net\/javascript-chan-hien-thi\/#De_lam_dieu_nay_tot_ban_can_phai_biet_trang_cua_ban_tai_cai_gi_va_tai_sao_no_lai_tai_nhung_thu_ay\" title=\"\u0110\u1ec3 l\u00e0m \u0111i\u1ec1u n\u00e0y t\u1ed1t b\u1ea1n c\u1ea7n ph\u1ea3i bi\u1ebft trang c\u1ee7a b\u1ea1n t\u1ea3i c\u00e1i g\u00ec v\u00e0 t\u1ea1i sao n\u00f3 l\u1ea1i t\u1ea3i nh\u1eefng th\u1ee9 \u1ea5y?\">\u0110\u1ec3 l\u00e0m \u0111i\u1ec1u n\u00e0y t\u1ed1t b\u1ea1n c\u1ea7n ph\u1ea3i bi\u1ebft trang c\u1ee7a b\u1ea1n t\u1ea3i c\u00e1i g\u00ec v\u00e0 t\u1ea1i sao n\u00f3 l\u1ea1i t\u1ea3i nh\u1eefng th\u1ee9 \u1ea5y?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/kiencang.net\/javascript-chan-hien-thi\/#Can_phai_biet_trang_cua_ban_dang_su_dung_nhung_gi_va_quyet_dinh_xem_no_co_dang_gia_cho_nguoi_duyet_web_phai_cho_doi_hay_khong\" title=\"C\u1ea7n ph\u1ea3i bi\u1ebft trang c\u1ee7a b\u1ea1n \u0111ang s\u1eed d\u1ee5ng nh\u1eefng g\u00ec, v\u00e0 quy\u1ebft \u0111\u1ecbnh xem n\u00f3 c\u00f3 \u0111\u00e1ng gi\u00e1 cho ng\u01b0\u1eddi duy\u1ec7t web ph\u1ea3i ch\u1edd \u0111\u1ee3i hay kh\u00f4ng?\">C\u1ea7n ph\u1ea3i bi\u1ebft trang c\u1ee7a b\u1ea1n \u0111ang s\u1eed d\u1ee5ng nh\u1eefng g\u00ec, v\u00e0 quy\u1ebft \u0111\u1ecbnh xem n\u00f3 c\u00f3 \u0111\u00e1ng gi\u00e1 cho ng\u01b0\u1eddi duy\u1ec7t web ph\u1ea3i ch\u1edd \u0111\u1ee3i hay kh\u00f4ng?<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Chan_hien_thi_render_nghia_la_gi\"><\/span>Ch\u1eb7n hi\u1ec3n th\u1ecb (render) ngh\u0129a l\u00e0 g\u00ec<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p><a href=\"https:\/\/kiencang.net\/cach-trang-web-tai-va-hien-thi\/\" target=\"_blank\" rel=\"noreferrer noopener\">Render ngh\u0129a l\u00e0 thao t\u00e1c gi\u00fap trang web \u0111\u01b0\u1ee3c k\u1ebft xu\u1ea5t, hi\u1ec3n th\u1ecb cho ng\u01b0\u1eddi d\u00f9ng tr\u00ean tr\u00ecnh duy\u1ec7t<\/a>, v\u00ec v\u1eady n\u1ebfu \u0111i\u1ec1u g\u00ec \u0111\u00f3 l\u00e0m ch\u1eb7n hi\u1ec3n th\u1ecb (render-blocking), \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 n\u00f3 l\u00e0m cho trang kh\u00f4ng \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb cho ng\u01b0\u1eddi d\u00f9ng nhanh nh\u1ea5t trong kh\u1ea3 n\u0103ng.<\/p>\n\n\n<p><em>L\u01b0u \u00fd nh\u1ecf<\/em>: b\u00e0i vi\u1ebft n\u00e0y n\u00f3i v\u1ec1 JavaScript ch\u1eb7n hi\u1ec3n th\u1ecb, kh\u00f4ng ph\u1ea3i <a href=\"https:\/\/kiencang.net\/loai-bo-css-chan-hien-thi\/\" target=\"_blank\" rel=\"noreferrer noopener\">CSS ch\u1eb7n hi\u1ec3n th\u1ecb<\/a>&nbsp;(ch\u00fang l\u00e0 nh\u1eefng c\u00e1i r\u1ea5t kh\u00e1c nhau, m\u1eb7c d\u00f9 \u0111\u1ec1u g\u00e2y ra phi\u1ec1n to\u00e1i l\u00e0m trang web ch\u1eadm hi\u1ec3n th\u1ecb cho ng\u01b0\u1eddi duy\u1ec7t web).<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"JavaScript_chan_hien_thi\"><\/span>JavaScript ch\u1eb7n hi\u1ec3n th\u1ecb<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p><a href=\"https:\/\/kiencang.net\/tang-toc-web-pagespeed-insights\/\" target=\"_blank\" rel=\"noreferrer noopener\">Google khuy\u1ebfn ngh\u1ecb lo\u1ea1i b\u1ecf ho\u1eb7c tr\u00ec ho\u00e3n JavaScript g\u00e2y tr\u1edf ng\u1ea1i<\/a> cho vi\u1ec7c t\u1ea3i ph\u1ea7n n\u1ed9i dung c\u1ee7a trang n\u1eb1m tr\u00ean m\u00e0n h\u00ecnh \u0111\u1ea7u ti\u00ean&nbsp;(above the fold).<\/p>\n\n\n<p><a href=\"https:\/\/kiencang.net\/uu-tien-noi-dung-hien-thi\/\">M\u00e0n h\u00ecnh \u0111\u1ea7u ti\u00ean c\u00f3 ngh\u0129a l\u00e0 nh\u1eefng g\u00ec m\u00e0 ng\u01b0\u1eddi d\u00f9ng th\u1ea5y \u0111\u1ea7u ti\u00ean tr\u00ean m\u00e0n h\u00ecnh<\/a> (ch\u01b0a c\u1ea7n cu\u1ed9n chu\u1ed9t tr\u00ean m\u00e1y b\u00e0n, ho\u1eb7c &#8220;vu\u1ed1t vu\u1ed1t&#8221; tr\u00ean mobile). M\u00e0n h\u00ecnh n\u00e0y c\u00f3 th\u1ec3 l\u00e0 \u0111i\u1ec7n tho\u1ea1i, iPad, m\u00e1y b\u00e0n ho\u1eb7c b\u1ea5t k\u1ef3 thi\u1ebft b\u1ecb n\u00e0o ng\u01b0\u1eddi d\u00f9ng s\u1eed d\u1ee5ng \u0111\u1ec3 xem trang web c\u1ee7a b\u1ea1n.<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/02\/tren-man-hinh-dau-tien.png\" alt=\"tr\u00ean m\u00e0n h\u00ecnh \u0111\u1ea7u ti\u00ean\" class=\"wp-image-11644\"\/><\/figure><\/div>\n\n\n<p>Th\u1ef1c h\u00e0nh n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng t\u1eeb l\u00e2u b\u1edfi nh\u1eefng ai \u0111ang t\u00ecm c\u00e1ch <a href=\"https:\/\/kiencang.net\/tang-toc-wordpress\/\" target=\"_blank\" rel=\"noreferrer noopener\">t\u0103ng t\u1ed1c trang web<\/a>, nh\u01b0ng n\u00f3 v\u1eabn c\u00f2n m\u1edbi m\u1ebb v\u1edbi ph\u1ea7n l\u1edbn nh\u1eefng ng\u01b0\u1eddi qu\u1ea3n tr\u1ecb, thi\u1ebft k\u1ebf web v\u00e0 c\u00f3 th\u1ec3 g\u00e2y ra m\u1ed9t ch\u00fat nh\u1ea7m l\u1eabn, th\u1eadm ch\u00ed c\u00f3 th\u1ec3 kh\u00f4ng bi\u1ebft l\u00e0m th\u1ebf n\u00e0o.<\/p>\n\n\n<p>Lo\u1ea1i b\u1ecf JavaScript ch\u1eb7n hi\u1ec3n th\u1ecb kh\u00f4ng ch\u1ec9 l\u00e0 c\u00f3 kh\u1ea3 n\u0103ng l\u00e0m \u0111\u01b0\u1ee3c, n\u00f3 c\u00f2n l\u00e0 y\u00eau c\u1ea7u c\u1ee7a ng\u01b0\u1eddi d\u00f9ng mu\u1ed1n t\u1ed1c \u0111\u1ed9 cao. Th\u1eadm ch\u00ed n\u1ebfu b\u1ea1n ch\u1eb3ng quan t\u00e2m \u0111\u1ebfn ng\u01b0\u1eddi d\u00f9ng c\u00f3 k\u1ebft n\u1ed1i internet ch\u1eadm, b\u1ea1n ph\u1ea3i quan t\u00e2m \u0111\u1ebfn th\u1ee9 h\u1ea1ng c\u1ee7a m\u00ecnh tr\u00ean m\u00e1y t\u00ecm ki\u1ebfm. <\/p>\n\n\n<p>Th\u1ee9 h\u1ea1ng c\u1ee7a b\u1ea1n tr\u00ean m\u00e1y t\u00ecm ki\u1ebfm s\u1ebd kh\u00f4ng \u1ed5n n\u1ebfu b\u1ea1n kh\u00f4ng t\u1ed1i \u01b0u h\u00f3a v\u1ea5n \u0111\u1ec1 n\u00e0y. \u0110\u1eb7c bi\u1ec7t n\u1ebfu m\u00e1y t\u00ecm ki\u1ebfm th\u1ea5y trang web c\u1ee7a b\u1ea1n kh\u00f4ng t\u1ea3i thu\u1eadn l\u1ee3i tr\u00ean m\u1ed9t s\u1ed1 thi\u1ebft b\u1ecb nh\u1ea5t \u0111\u1ecbnh (\u0111i\u1ec7n tho\u1ea1i di \u0111\u1ed9ng, m\u00e1y t\u00ednh b\u1ea3ng, v\u00e2n v\u00e2n) h\u1ecd s\u1ebd kh\u00f4ng \u0111\u01b0a trang c\u1ee7a b\u1ea1n v\u00e0o k\u1ebft qu\u1ea3 t\u00ecm ki\u1ebfm, v\u00ec m\u00e1y t\u00ecm ki\u1ebfm n\u00f3i chung kh\u00f4ng mu\u1ed1n g\u1eedi ng\u01b0\u1eddi d\u00f9ng \u0111\u1ebfn m\u1ed9t trang ch\u1eadm ch\u1ea1p ho\u1eb7c trang m\u00e0 ng\u01b0\u1eddi d\u00f9ng ph\u1ea3i \u0111\u1ee3i r\u1ea5t l\u00e2u m\u1edbi c\u00f3 \u0111\u01b0\u1ee3c n\u1ed9i dung.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Lam_the_nao_de_xac_dinh_duoc_JavaScript_chan_hien_thi\"><\/span>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c JavaScript ch\u1eb7n hi\u1ec3n th\u1ecb<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>B\u1ea1n c\u1ea7n ph\u1ea3i bi\u1ebft trang c\u1ee7a m\u00ecnh \u0111ang t\u1ea3i c\u00e1i g\u00ec. C\u00f3 m\u1ed9t s\u1ed1 c\u00e1ch \u0111\u1ec3 l\u00e0m \u0111i\u1ec1u n\u00e0y. T\u00f4i g\u1ee3i \u00fd b\u1ea1n nh\u00ecn s\u00e2u v\u00e0o nh\u1eefng g\u00ec trang \u0111ang t\u1ea3i b\u1eb1ng c\u00f4ng c\u1ee5 pagespeed:<a href=\"https:\/\/www.internetmarketingninjas.com\/tools\/free-tools\/pagespeed\" target=\"_blank\" rel=\"noreferrer noopener\"> internetmarketingninjas.com\/pagespeed<\/a> \u0111\u1ec3 c\u00f3 c\u00e1i nh\u00ecn t\u1ed5ng quan v\u1ec1 c\u00e1c v\u1ea5n \u0111\u1ec1 c\u1ee7a trang ho\u1eb7c giao di\u1ec7n g\u1eb7p ph\u1ea3i. <\/p>\n\n\n<p>\u0110\u1ec3 bi\u1ebft \u0111\u01b0\u1ee3c c\u00e1c file c\u1ee5 th\u1ec3 \u0111ang ch\u1eb7n hi\u1ec3n th\u1ecb b\u1ea1n ph\u1ea3i s\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 ki\u1ec3u nh\u01b0 <a href=\"http:\/\/developers.google.com\/speed\/pagespeed\/insights\/\">Google pagespeed insights<\/a>. C\u00f4ng c\u1ee5 n\u00e0y s\u1ebd n\u00f3i cho b\u1ea1n bi\u1ebft ch\u00ednh x\u00e1c nh\u1eefng file n\u00e0o \u0111ang ch\u1eb7n m\u1ed9t trang c\u1ee5 th\u1ec3.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Lam_the_nao_de_loai_bo_JavaScript_chan_hien_thi\"><\/span>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 lo\u1ea1i b\u1ecf JavaScript ch\u1eb7n hi\u1ec3n th\u1ecb<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>M\u1ed9t trong c\u00e1c th\u1ee7 ph\u1ea1m ph\u1ed5 bi\u1ebfn nh\u1ea5t v\u1ec1 JavaScript ch\u1eb7n hi\u1ec3n th\u1ecb, v\u00e0 c\u0169ng l\u00e0 m\u1ed9t v\u00ed d\u1ee5 r\u1ea5t t\u1ed1t cho v\u1ea5n \u0111\u1ec1 n\u00e0y l\u00e0 jQuery &#8211; m\u1ed9t t\u1ec7p JavaScript \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng b\u1edfi m\u1ed9t t\u1ef7 l\u1ec7 l\u1edbn trang web tr\u00ean to\u00e0n c\u1ea7u. R\u1ea5t c\u00f3 kh\u1ea3 n\u0103ng l\u00e0 b\u1ea1n \u0111ang s\u1eed d\u1ee5ng n\u00f3 (n\u1ebfu \u0111\u00fang v\u1eady h\u00e3y t\u00ecm hi\u1ec3u th\u00eam c\u00f4ng c\u1ee5 c\u1ee7a Varvy).<\/p>\n\n\n<p>jQuery l\u00e0 m\u1ed9t t\u1ec7p kh\u00e1 n\u1eb7ng, trong th\u1ef1c t\u1ebf n\u00f3 c\u00f3 th\u1ec3 l\u00e0 file l\u1edbn nh\u1ea5t m\u00e0 trang web c\u1ee7a b\u1ea1n c\u1ea7n t\u1ea3i \u0111\u1ec3 render (hi\u1ec3n th\u1ecb) trang.<\/p>\n\n\n<p>jQuery l\u00e0 m\u1ed9t t\u1ec7p JavaScript ph\u1ed5 bi\u1ebfn, v\u00e0 <a href=\"https:\/\/kiencang.net\/loai-bo-jquery\/\" target=\"_blank\" rel=\"noreferrer noopener\">th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u00e0m nh\u1eefng vi\u1ec7c r\u1ea5t \u0111\u01a1n gi\u1ea3n<\/a> nh\u01b0 l\u00e0 c\u00e1c k\u1ef9 thu\u1eadt fade in (hi\u1ec7n ra d\u1ea7n d\u1ea7n) ho\u1eb7c fade out (bi\u1ebfn m\u1ea5t d\u1ea7n d\u1ea7n) cho \u1ea3nh. Th\u00f4ng th\u01b0\u1eddng kh\u00f4ng c\u00f3 l\u00fd do \u0111\u1ec3 t\u1ea3i jQuery tr\u01b0\u1edbc khi b\u1ea1n t\u1ea3i trang, nh\u01b0ng ph\u1ea7n l\u1edbn c\u00e1c trang web l\u1ea1i \u0111ang l\u00e0m \u0111i\u1ec1u \u0111\u00f3.<\/p>\n\n\n<p>N\u1ebfu th\u00e0nh ph\u1ea7n c\u1ee7a website s\u1eed d\u1ee5ng jQuery n\u1eb1m d\u01b0\u1edbi m\u00e0n h\u00ecnh \u0111\u1ea7u ti\u00ean th\u00ec b\u1ea1n <strong>kh\u00f4ng c\u00f3 l\u00fd do g\u00ec \u0111\u1ec3 t\u1ea3i n\u00f3 tr\u01b0\u1edbc khi n\u00f3 \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ebfn<\/strong>. N\u1ebfu b\u1ea1n t\u1ea3i n\u00f3 tr\u01b0\u1edbc, b\u1ea1n \u0111ang kh\u00f4ng l\u00e0m theo h\u01b0\u1edbng d\u1eabn v\u1ec1 t\u0103ng t\u1ed1c trang v\u00e0 b\u1ea1n l\u00e0m cho ng\u01b0\u1eddi d\u00f9ng ph\u1ea3i m\u1ea5t c\u00f4ng ch\u1edd \u0111\u1ee3i.<\/p>\n\n\n<p>\u0110\u1ec3 s\u1eeda l\u1ed7i n\u00e0y, b\u1ea1n c\u1ea7n ph\u1ea3i thay \u0111\u1ed5i v\u1ecb tr\u00ed m\u00e0 jQuery \u0111\u01b0\u1ee3c g\u1ecdi. \u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n trong HTML c\u1ee7a trang web. C\u00e1ch th\u1ee9c m\u00e0 ph\u1ea7n l\u1edbn c\u00e1c trang web hi\u1ec7n nay s\u1eed d\u1ee5ng l\u00e0 g\u1ecdi jQuery \u1edf trong ph\u1ea7n \u0111\u1ea7u (n\u1eb1m trong th\u1ebb <code>&lt;head><\/code>) c\u1ee7a t\u00e0i li\u1ec7u nh\u01b0 \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y b\u00ean d\u01b0\u1edbi:<\/p>\n\n\n<pre class=\"wp-block-preformatted\">&lt;head&gt;\n&lt;meta name=description content=\"description here.\"\/&gt;\n&lt;title&gt;title here&lt;\/title&gt;\n&lt;style&gt;\nstyles here\n&lt;\/style&gt;\n&lt;script src=\"jquery.js\"&gt;\n&lt;\/script&gt;\n&lt;\/head&gt;<\/pre>\n\n\n<p>N\u00f3 g\u1ecdi \u0111\u1ebfn jQuery (m\u1ed9t file kh\u00e1 l\u1edbn) v\u00e0 \u0111\u01b0\u1ee3c t\u1ea3i xu\u1ed1ng b\u1edfi tr\u00ecnh duy\u1ec7t tr\u01b0\u1edbc khi <strong>b\u1ea5t c\u1ee9 \u0111i\u1ec1u g\u00ec kh\u00e1c \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb tr\u00ean trang<\/strong>. \u0110\u00e2y l\u00e0 \u0111i\u1ec1u kh\u00f4ng t\u1ed1t. \u0110i\u1ec1u n\u00e0y th\u1ef1c s\u1ef1 t\u1ec7 h\u1ea1i n\u1ebfu th\u1ee9 m\u00e0 b\u1ea1n c\u1ea7n \u0111\u1ebfn jQuery l\u00e0 kh\u00f4ng c\u1ea7n thi\u1ebft cho ph\u1ea7n n\u1ed9i dung thu\u1ed9c m\u00e0n h\u00ecnh \u0111\u1ea7u ti\u00ean nh\u01b0 trong h\u00ecnh tr\u00ean cho th\u1ea5y.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Giai_phap_khong_hoan_chinh_thuong_duoc_su_dung\"><\/span>Gi\u1ea3i ph\u00e1p kh\u00f4ng ho\u00e0n ch\u1ec9nh th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Th\u01b0\u1eddng th\u00ec l\u1ec7nh g\u1ecdi t\u1edbi jQuery s\u1ebd \u0111\u01b0\u1ee3c lo\u1ea1i b\u1ecf kh\u1ecfi ph\u1ea7n \u0111\u1ea7u c\u1ee7a t\u00e0i li\u1ec7u v\u00e0 chuy\u1ec3n xu\u1ed1ng v\u1ecb tr\u00ed n\u00e0o \u0111\u00f3 kh\u00e1c \u1edf d\u01b0\u1edbi s\u00e2u h\u01a1n c\u1ee7a trang, v\u00ec \u0111\u1ec3 \u1edf ph\u1ea7n \u0111\u1ea7u l\u00e0 kh\u00f4ng c\u1ea7n thi\u1ebft. Th\u1eadt kh\u00f4ng may \u0111i\u1ec1u \u0111\u00f3 l\u00e0 kh\u00f4ng \u0111\u1ee7.<\/p>\n\n\n<pre class=\"wp-block-preformatted\">&lt;!-- nh\u1eefng ph\u1ea7n kh\u00f4ng c\u1ea7n \u0111\u1ebfn jquery (h\u1ea7u h\u1ebft c\u00e1c trang web) n\u1eb1m \u1edf \u0111\u00e2y--&gt;\n&lt;script src=\"jquery.js\"&gt;\n&lt;\/script&gt;\n&lt;!-- nh\u1eefng ph\u1ea7n c\u1ea7n \u0111\u1ebfn jQuery n\u1eb1m \u1edf \u0111\u00e2y --&gt;<\/pre>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Giai_phap_thuc_sutot_hon\"><\/span>Gi\u1ea3i ph\u00e1p th\u1ef1c s\u1ef1\/t\u1ed1t h\u01a1n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>\u0110\u1ec3 ho\u00e0n to\u00e0n lo\u1ea1i b\u1ecf JavaScript kh\u1ecfi <a href=\"https:\/\/kiencang.net\/duong-dan-hien-thi-trang-quan-trong\/\" target=\"_blank\" rel=\"noreferrer noopener\">tuy\u1ebfn render<\/a>, n\u00f3 c\u1ea7n ph\u1ea3i \u0111\u01b0\u1ee3c tr\u00ec ho\u00e3n t\u1ea3i cho \u0111\u1ebfn khi trang t\u1ea3i xong. T\u00f4i c\u00f3 m\u1ed9t h\u01b0\u1edbng d\u1eabn \u0111\u1ec3 l\u00e0m \u0111i\u1ec1u n\u00e0y s\u1eed d\u1ee5ng c\u00e1c khuy\u1ebfn ngh\u1ecb c\u1ee7a Google \u0111\u1ec3 <a href=\"https:\/\/kiencang.net\/tri-hoan-tai-javascript\/\" target=\"_blank\" rel=\"noreferrer noopener\">tr\u00ec ho\u00e3n ho\u00e0n to\u00e0n JavaScript<\/a>.<\/p>\n\n\n<p>PS: c\u00e1ch \u0111\u01a1n gi\u1ea3n h\u01a1n m\u00e0 c\u00e1c plugin cache c\u0169ng nh\u01b0 c\u00f4ng c\u1ee5 t\u1ed1i \u01b0u kh\u00e1c th\u01b0\u1eddng l\u00e0m tr\u00ean WordPress l\u00e0 s\u1eed d\u1ee5ng <a href=\"https:\/\/kiencang.net\/tai-javascript-defer-async\/\" target=\"_blank\" rel=\"noreferrer noopener\">c\u00e1ch t\u1ea3i defer JavaScript<\/a>.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"De_lam_dieu_nay_tot_ban_can_phai_biet_trang_cua_ban_tai_cai_gi_va_tai_sao_no_lai_tai_nhung_thu_ay\"><\/span>\u0110\u1ec3 l\u00e0m \u0111i\u1ec1u n\u00e0y t\u1ed1t b\u1ea1n c\u1ea7n ph\u1ea3i bi\u1ebft trang c\u1ee7a b\u1ea1n <strong>t\u1ea3i c\u00e1i g\u00ec<\/strong> v\u00e0 <strong>t\u1ea1i sao<\/strong> n\u00f3 l\u1ea1i t\u1ea3i nh\u1eefng th\u1ee9 \u1ea5y?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>B\u1ea5t c\u1ee9 \u0111i\u1ec1u g\u00ec m\u00e0 trang web c\u1ee7a b\u1ea1n g\u1ecdi \u0111\u1ebfn \u0111\u1ec1u l\u00e0m ng\u01b0\u1eddi d\u00f9ng c\u1ee7a b\u1ea1n t\u1ed1n th\u1eddi gian. N\u1ebfu b\u1ea1n kh\u00f4ng bi\u1ebft trang c\u1ee7a m\u00ecnh y\u00eau c\u1ea7u \u0111i\u1ec1u g\u00ec, b\u1ea1n c\u1ea7n ph\u1ea3i thay \u0111\u1ed5i \u0111i\u1ec1u n\u00e0y. jQuery l\u00e0 m\u1ed9t v\u00ed d\u1ee5 t\u1ed1t b\u1edfi v\u00ec n\u00f3 r\u1ea5t ph\u1ed5 bi\u1ebfn c\u0169ng nh\u01b0 l\u00e0 file c\u00f3 dung l\u01b0\u1ee3ng l\u1edbn (kho\u1ea3ng 100KB).<\/p>\n\n\n<p>M\u1ed9t k\u1ecbch b\u1ea3n ph\u1ed5 bi\u1ebfn l\u00e0 m\u1ed9t trang web nh\u1ecf ch\u1ec9 kho\u1ea3ng 10KB <a href=\"https:\/\/kiencang.net\/loai-bo-jquery\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u0111ang g\u1ecdi m\u1ed9t file l\u1edbn nh\u01b0 jQuery<\/a> (c\u00e1i t\u1ed1n th\u1eddi gian h\u01a1n m\u01b0\u1eddi l\u1ea7n so v\u1edbi ch\u00ednh b\u1ea3n th\u00e2n trang web) \u0111\u1ec3 l\u00e0m m\u1ed9t nhi\u1ec7m v\u1ee5 kh\u00e1 l\u00e0 \u0111\u01a1n gi\u1ea3n nh\u01b0 l\u00e0m ch\u1eef hi\u1ec7n d\u1ea7n l\u00ean tr\u00ean trang! <\/p>\n\n\n<p>Khi nh\u00ecn v\u00e0o hi\u1ec7u \u1ee9ng, b\u1ea1n c\u00f3 th\u1ec3 c\u00f3 \u00fd ngh\u0129 n\u00e0y &#8220;zee, zee, n\u00f3 tr\u00f4ng th\u1eadt tuy\u1ec7t!&#8221;, nh\u01b0ng li\u1ec7u n\u00f3 c\u00f3 \u0111\u1ee7 tuy\u1ec7t \u0111\u1ec3 l\u00e0m ng\u01b0\u1eddi d\u00f9ng t\u1ed1n th\u1eddi gian h\u01a1n m\u01b0\u1eddi l\u1ea7n \u0111\u1ec3 th\u1ea5y trang c\u1ee7a b\u1ea1n? B\u1ea1n c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng c\u00f3 \u0111\u01b0\u1ee3c hi\u1ec7u \u1ee9ng t\u01b0\u01a1ng t\u1ef1 v\u1edbi CSS3 ho\u1eb7c file JavaScript nh\u1ecf h\u01a1n nhi\u1ec1u.<\/p>\n\n\n<p>T\u00f4i s\u1eed d\u1ee5ng jQuery l\u00e0m v\u00ed d\u1ee5 nh\u01b0ng t\u00f4i kh\u00f4ng c\u00f3 \u00fd n\u00f3i r\u1eb1ng n\u00f3 t\u1ec7 h\u1ea1i. \u0110i\u1ec1u t\u01b0\u01a1ng t\u1ef1 c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c n\u00f3i v\u1ec1 nh\u1eefng \u0111o\u1ea1n m\u00e3 JavaScript th\u1eadm ch\u00ed c\u00f2n ph\u1ed5 bi\u1ebfn h\u01a1n ch\u1eb3ng h\u1ea1n nh\u01b0 Google Analytics, ho\u1eb7c JavaScript c\u1ee7a b\u00ean th\u1ee9 ba d\u00f9ng \u0111\u1ec3 hi\u1ec3n th\u1ecb widget ho\u1eb7c ch\u1ec9 \u0111\u01a1n gi\u1ea3n l\u00e0 c\u00e1c n\u00fat b\u1ea5m m\u1ea1ng x\u00e3 h\u1ed9i nh\u01b0 Facebook, Twitter m\u00e0 m\u1ecdi ng\u01b0\u1eddi r\u1ea5t y\u00eau th\u00edch.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_phai_biet_trang_cua_ban_dang_su_dung_nhung_gi_va_quyet_dinh_xem_no_co_dang_gia_cho_nguoi_duyet_web_phai_cho_doi_hay_khong\"><\/span>C\u1ea7n ph\u1ea3i bi\u1ebft trang c\u1ee7a b\u1ea1n \u0111ang s\u1eed d\u1ee5ng nh\u1eefng g\u00ec, v\u00e0 quy\u1ebft \u0111\u1ecbnh xem n\u00f3 c\u00f3 \u0111\u00e1ng gi\u00e1 cho ng\u01b0\u1eddi duy\u1ec7t web ph\u1ea3i ch\u1edd \u0111\u1ee3i hay kh\u00f4ng?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<ul><li>PageSpeed Insights l\u00e0 c\u00e1ch hay \u0111\u1ec3 xem trang c\u1ee7a b\u1ea1n \u0111ang s\u1eed d\u1ee5ng c\u00e1i g\u00ec;<\/li><li>\u0110\u1ec3 lo\u1ea1i tr\u1eeb JavaScript ch\u1eb7n hi\u1ec3n th\u1ecb b\u1ea1n ph\u1ea3i tr\u00ec ho\u00e3n t\u1ea3i n\u00f3.<\/li><\/ul>\n\n\n<p>P\/S: N\u1ebfu b\u1ea1n d\u00f9ng WordPress, c\u00e1c plugin nh\u01b0 <a href=\"https:\/\/kiencang.net\/plugin-autoptimize\/\" target=\"_blank\" rel=\"noreferrer noopener\">Autoptimize<\/a> v\u00e0 <a href=\"https:\/\/kiencang.net\/plugin-async-javascript\/\" target=\"_blank\" rel=\"noreferrer noopener\">Async JavaScript<\/a> l\u00e0 c\u00e1c l\u1ef1a ch\u1ecdn t\u1ed1t \u0111\u1ec3 lo\u1ea1i b\u1ecf c\u00e1c JavaScript ch\u1eb7n hi\u1ec3n th\u1ecb, bao g\u1ed3m c\u1ea3 jQuery khi c\u1ea7n thi\u1ebft. C\u00e1c plugin cache t\u1ed1t nh\u01b0 LiteSpeed cache l\u00e0 gi\u1ea3i ph\u00e1p thay th\u1ebf tuy\u1ec7t v\u1eddi kh\u00e1c.<\/p>\n\n\n<p><em>(D\u1ecbch t\u1eeb b\u00e0i vi\u1ebft: Render blocking javascripts &#8211; T\u00e1c gi\u1ea3: Patrick Sexton &#8211; Website: Varvy)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ch\u1eb7n hi\u1ec3n th\u1ecb (render) ngh\u0129a l\u00e0 g\u00ec Render ngh\u0129a l\u00e0 thao t\u00e1c gi\u00fap trang web \u0111\u01b0\u1ee3c k\u1ebft xu\u1ea5t, hi\u1ec3n th\u1ecb cho ng\u01b0\u1eddi d\u00f9ng tr\u00ean tr\u00ecnh duy\u1ec7t, v\u00ec v\u1eady n\u1ebfu \u0111i\u1ec1u g\u00ec \u0111\u00f3 l\u00e0m ch\u1eb7n hi\u1ec3n th\u1ecb (render-blocking), \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 n\u00f3 l\u00e0m cho trang kh\u00f4ng \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb cho ng\u01b0\u1eddi d\u00f9ng nhanh nh\u1ea5t &hellip;<\/p>\n","protected":false},"author":1,"featured_media":13069,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[272],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>C\u00e1ch lo\u1ea1i b\u1ecf JavaScript ch\u1eb7n hi\u1ec3n th\u1ecb &#8226; 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