{"id":11792,"date":"2019-02-17T07:53:00","date_gmt":"2019-02-17T00:53:00","guid":{"rendered":"https:\/\/www.ducanhplus.com\/?p=11792"},"modified":"2022-08-06T07:47:07","modified_gmt":"2022-08-06T00:47:07","slug":"diem-tuong-tac-trang","status":"publish","type":"post","link":"https:\/\/kiencang.net\/diem-tuong-tac-trang\/","title":{"rendered":"Xem x\u00e9t &#8220;\u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c&#8221; tr\u00ean trang khi t\u0103ng t\u1ed1c Website"},"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-6577d727170aa\" ><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-6577d727170aa\"  type=\"checkbox\" id=\"item-6577d727170aa\"><\/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\/diem-tuong-tac-trang\/#1_Diem_tuong_tac_tren_trang_website_la_gi\" title=\"#1. \u0110i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang (website) l\u00e0 g\u00ec?\">#1. \u0110i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang (website) 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\/diem-tuong-tac-trang\/#2_Hay_thu_dat_phong_khach_san\" title=\"#2. H\u00e3y th\u1eed \u0111\u1eb7t ph\u00f2ng kh\u00e1ch s\u1ea1n\">#2. H\u00e3y th\u1eed \u0111\u1eb7t ph\u00f2ng kh\u00e1ch s\u1ea1n<\/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\/diem-tuong-tac-trang\/#3_Tam_quan_trong_cua_%E2%80%9Cdiem_tuong_tac_tren_trang%E2%80%9D\" title=\"#3. T\u1ea7m quan tr\u1ecdng c\u1ee7a &#8220;\u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang&#8221;\">#3. T\u1ea7m quan tr\u1ecdng c\u1ee7a &#8220;\u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang&#8221;<\/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\/diem-tuong-tac-trang\/#4_Lam_the_nao_de_toi_uu_hoa_cho_diem_tuong_tac_tren_trang\" title=\"#4. L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a cho \u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang\">#4. L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a cho \u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang<\/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\/diem-tuong-tac-trang\/#5_Thuc_hien_quyet_dinh_dua_vao_diem_tuong_tac_tren_trang\" title=\"#5. Th\u1ef1c hi\u1ec7n quy\u1ebft \u0111\u1ecbnh d\u1ef1a v\u00e0o \u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang\">#5. Th\u1ef1c hi\u1ec7n quy\u1ebft \u0111\u1ecbnh d\u1ef1a v\u00e0o \u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang<\/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\/diem-tuong-tac-trang\/#6_Javascript\" title=\"#6. Javascript\">#6. Javascript<\/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\/diem-tuong-tac-trang\/#7_Trang_cho_muc_dich_hien_thi_bai_viet\" title=\"#7. Trang cho m\u1ee5c \u0111\u00edch hi\u1ec3n th\u1ecb b\u00e0i vi\u1ebft\">#7. Trang cho m\u1ee5c \u0111\u00edch hi\u1ec3n th\u1ecb b\u00e0i vi\u1ebft<\/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\/diem-tuong-tac-trang\/#8_Trang_dat_phong_khach_san\" title=\"#8. Trang \u0111\u1eb7t ph\u00f2ng kh\u00e1ch s\u1ea1n\">#8. Trang \u0111\u1eb7t ph\u00f2ng kh\u00e1ch s\u1ea1n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/kiencang.net\/diem-tuong-tac-trang\/#9_Tri_hoan_defer_va_tai_khong_dong_bo_async\" title=\"#9. Tr\u00ec ho\u00e3n (defer) v\u00e0 t\u1ea3i kh\u00f4ng \u0111\u1ed3ng b\u1ed9 (async)?\">#9. Tr\u00ec ho\u00e3n (defer) v\u00e0 t\u1ea3i kh\u00f4ng \u0111\u1ed3ng b\u1ed9 (async)?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/kiencang.net\/diem-tuong-tac-trang\/#10_Tat_ca_moi_can_nhac_ve_toc_do_trang_phai_phu_thuoc_vao_diem_tuong_tac_tren_trang\" title=\"#10. T\u1ea5t c\u1ea3 m\u1ecdi c\u00e2n nh\u1eafc v\u1ec1 t\u1ed1c \u0111\u1ed9 trang ph\u1ea3i ph\u1ee5 thu\u1ed9c v\u00e0o \u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang\">#10. T\u1ea5t c\u1ea3 m\u1ecdi c\u00e2n nh\u1eafc v\u1ec1 t\u1ed1c \u0111\u1ed9 trang ph\u1ea3i ph\u1ee5 thu\u1ed9c v\u00e0o \u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Diem_tuong_tac_tren_trang_website_la_gi\"><\/span>#1. \u0110i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang (website) l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul><li>\u0110i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang (page interaction page) l\u00e0 kho\u1ea3nh kh\u1eafc ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i (core functionality) c\u1ee7a m\u1ed9t trang web.<\/li><li>Kh\u1ea3 n\u0103ng t\u01b0\u01a1ng t\u00e1c (interaction) ngh\u0129a l\u00e0 th\u1ea5y n\u1ed9i dung <em>v\u00e0<\/em>&nbsp;c\u00f3 kh\u1ea3 n\u0103ng t\u01b0\u01a1ng t\u00e1c v\u1edbi n\u00f3 (click v\u00e0o n\u00fat b\u1ea5m, th\u1ef1c hi\u1ec7n m\u1ed9t l\u1ef1a ch\u1ecdn, \u0111i\u1ec1u h\u01b0\u1edbng, v\u00e2n v\u00e2n).<\/li><li>\u0110i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang l\u00e0 kho\u1ea3nh kh\u1eafc c\u00f3 t\u00ednh kh\u00e1i ni\u1ec7m h\u01a1n l\u00e0 s\u1ef1 ki\u1ec7n t\u1ea3i trang c\u00f3 t\u00ednh k\u1ef9 thu\u1eadt (technical pageload event).<\/li><\/ul>\n\n\n\n<p>M\u1ee5c \u0111\u00edch th\u1ef1c s\u1ef1, x\u00e9t cho c\u00f9ng c\u1ee7a to\u00e0n b\u1ed9 m\u1ee5c ti\u00eau (entire point) <a href=\"https:\/\/kiencang.net\/tang-toc-wordpress\/\" target=\"_blank\" rel=\"noreferrer noopener\">l\u00e0m cho trang web nhanh h\u01a1n<\/a> l\u00e0 \u0111\u1ec3 n\u00f3 c\u00f3 th\u1ec3 <em>gi\u00fap ng\u01b0\u1eddi d\u00f9ng t\u01b0\u01a1ng t\u00e1c \u0111\u01b0\u1ee3c nhanh h\u01a1n<\/em>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Hay_thu_dat_phong_khach_san\"><\/span>#2. H\u00e3y th\u1eed \u0111\u1eb7t ph\u00f2ng kh\u00e1ch s\u1ea1n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>M\u1ed9t v\u00ed d\u1ee5 t\u1ed1t l\u00e0 ch\u00fang ta h\u00e3y v\u00e0o trang \u0111\u1eb7t ph\u00f2ng kh\u00e1ch s\u1ea1n, n\u01a1i b\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y m\u1ecdi th\u1ee9 tr\u00ean trang, nh\u01b0ng v\u1ecb tr\u00ed \u0111\u1ec3 b\u1ea1n th\u1ef1c s\u1ef1 thao t\u00e1c h\u00e0nh \u0111\u1ed9ng \u0111\u1eb7t ph\u00f2ng s\u1ebd kh\u00f4ng kh\u1ea3 d\u1ee5ng trong kho\u1ea3ng v\u00e0i gi\u00e2y sau khi trang t\u1ea3i xong.<\/p>\n\n\n\n<p>N\u1ebfu to\u00e0n b\u1ed9 l\u00fd do m\u00e0 m\u1ed9t ng\u01b0\u1eddi s\u1eed d\u1ee5ng trang l\u00e0 \u0111\u1ec3 \u0111\u1eb7t ph\u00f2ng kh\u00e1ch s\u1ea1n, th\u1ebf th\u00ec trang c\u00f3 th\u1ec3 t\u1ed1t trong vi\u1ec7c &#8220;t\u1ea3i v\u1ec1&#8221; v\u00e0 &#8220;hi\u1ec3n th\u1ecb&#8221; nh\u01b0ng n\u00f3 l\u1ea1i c\u00f3 th\u1ec3 kh\u00f4ng s\u1eed d\u1ee5ng \u0111\u01b0\u1ee3c c\u00e1c ch\u1ee9c n\u0103ng m\u00e0 ng\u01b0\u1eddi \u0111\u00f3 mong mu\u1ed1n s\u1eed d\u1ee5ng tr\u00ean trang.<\/p>\n\n\n\n<p>Trong tr\u01b0\u1eddng h\u1ee3p nh\u01b0 v\u1eady, th\u1ef1c s\u1ef1 l\u00e0 kh\u00f4ng c\u00f3 s\u1ef1 ph\u00e2n bi\u1ec7t gi\u1eefa vi\u1ec7c t\u1ea3i trang v\u00e0 vi\u1ec7c trang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng.<\/p>\n\n\n\n<p>Trang c\u00f3 th\u1ec3 t\u1ea3i trong v\u00f2ng hai gi\u00e2y, nh\u01b0ng n\u1ebfu ng\u01b0\u1eddi s\u1eed d\u1ee5ng trang \u0111\u1ec3 \u0111\u1eb7t ph\u00f2ng kh\u00e1ch s\u1ea1n kh\u00f4ng th\u1ec3 \u0111\u1eb7t ph\u00f2ng cho \u0111\u1ebfn h\u1ebft gi\u00e2y th\u1ee9 b\u1ea3y, th\u00ec d\u01b0\u1eddng nh\u01b0 l\u00e0 <em>kh\u00f4ng ch\u00ednh x\u00e1c<\/em> n\u1ebfu tuy\u00ean b\u1ed1 r\u1eb1ng trang t\u1ea3i xong trong v\u00f2ng hai gi\u00e2y.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Tam_quan_trong_cua_%E2%80%9Cdiem_tuong_tac_tren_trang%E2%80%9D\"><\/span>#3. T\u1ea7m quan tr\u1ecdng c\u1ee7a &#8220;\u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang&#8221;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul><li>N\u00f3 nh\u1ea5n m\u1ea1nh r\u1eb1ng tr\u1ea3i nghi\u1ec7m m\u00e0 ng\u01b0\u1eddi d\u00f9ng c\u00f3 v\u1edbi m\u1ed9t trang web l\u00e0 m\u1ee5c ti\u00eau c\u1ed1t l\u00f5i c\u1ee7a vi\u1ec7c t\u1ed1i \u01b0u h\u00f3a t\u1ed1c \u0111\u1ed9 t\u1ea3i trang.<\/li><li>S\u1ebd l\u00e0 ph\u01b0\u01a1ng th\u1ee9c h\u1eefu \u00edch v\u00e0 c\u00f3 \u00fd ngh\u0129a h\u01a1n khi so s\u00e1nh hai k\u1ecbch b\u1ea3n d\u1ef1a tr\u00ean tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng h\u01a1n l\u00e0 c\u00e1c s\u1ef1 ki\u1ec7n t\u1ea3i trang mang t\u00ednh k\u1ef9 thu\u1eadt.<\/li><li>\u00dd th\u1ee9c \u0111\u01b0\u1ee3c r\u1eb1ng ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i c\u1ee7a trang l\u00e0 ch\u1ec9 s\u1ed1 c\u01a1 b\u1ea3n nh\u1ea5t &#8211; s\u1ebd l\u00e0 ti\u00eau ch\u00ed gi\u00fap quy\u1ebft \u0111\u1ecbnh xem \u0111i\u1ec1u g\u00ec l\u00e0 t\u1ed1t nh\u1ea5t cho trang.<\/li><\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Lam_the_nao_de_toi_uu_hoa_cho_diem_tuong_tac_tren_trang\"><\/span>#4. L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a cho \u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ol><li>X\u00e1c \u0111\u1ecbnh r\u00f5 ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i c\u1ee7a trang l\u00e0 g\u00ec?<\/li><li>X\u00e1c \u0111\u1ecbnh r\u00f5 c\u00f3 th\u1ec3 lo\u1ea1i b\u1ecf \u0111o\u1ea1n m\u00e3 n\u00e0o kh\u1ecfi <a href=\"https:\/\/kiencang.net\/duong-dan-hien-thi-trang-quan-trong\/\" target=\"_blank\" rel=\"noreferrer noopener\">tuy\u1ebfn hi\u1ec3n th\u1ecb quan tr\u1ecdng<\/a> m\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i c\u1ee7a trang.<\/li><li><a href=\"https:\/\/kiencang.net\/ly-giai-don-gian-ve-lazy-load\/\" target=\"_blank\" rel=\"noreferrer noopener\">Tr\u00ec ho\u00e3n (lazy load) m\u1ecdi th\u1ee9 kh\u00f4ng c\u1ea7n thi\u1ebft<\/a> v\u1edbi ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i.<\/li><\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Thuc_hien_quyet_dinh_dua_vao_diem_tuong_tac_tren_trang\"><\/span>#5. Th\u1ef1c hi\u1ec7n quy\u1ebft \u0111\u1ecbnh d\u1ef1a v\u00e0o \u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><a href=\"https:\/\/kiencang.net\/tri-hoan-tai-nhieu-file-javascript\/\" target=\"_blank\" rel=\"noreferrer noopener\">X\u1eed l\u00fd JavaScript<\/a> l\u00e0 m\u1ed9t trong nhi\u1ec7m v\u1ee5 c\u01a1 b\u1ea3n v\u00e0 n\u1ec1n t\u1ea3ng nh\u1ea5t \u0111\u1ec3 t\u0103ng t\u1ed1c \u0111\u1ed9 website.<\/p>\n\n\n\n<p>C\u00e1ch th\u1ee9c m\u00e0 JavaScript n\u00ean \u0111\u01b0\u1ee3c x\u1eed l\u00fd ho\u00e0n to\u00e0n ph\u1ee5 thu\u1ed9c v\u00e0o ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i c\u1ee7a trang, tuy nhi\u00ean c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t hi\u1ec7n kh\u00f4ng th\u1eeba nh\u1eadn \u0111i\u1ec1u \u0111\u00f3.<\/p>\n\n\n\n<p>S\u1eed d\u1ee5ng \u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang c\u00f3 ngh\u0129a l\u00e0 tr\u01b0\u1edbc h\u1ebft ch\u00fang ta x\u00e1c \u0111\u1ecbnh r\u00f5 ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i c\u1ee7a trang r\u1ed3i sau \u0111\u00f3 m\u1edbi \u0111\u01b0a ra c\u00e1c quy\u1ebft \u0111\u1ecbnh.<\/p>\n\n\n\n<p>B\u00ean d\u01b0\u1edbi ch\u00fang ta s\u1ebd xem x\u00e9t quy\u1ebft \u0111\u1ecbnh cho vi\u1ec7c s\u1eed d\u1ee5ng JavaScript.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"6_Javascript\"><\/span>#6. Javascript<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00e1ch JavaScript n\u00ean \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0 r\u1ea5t kh\u00e1c bi\u1ec7t, n\u00f3 ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ee5c \u0111\u00edch JavaScript \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng tr\u00ean trang l\u00e0 g\u00ec.<\/p>\n\n\n\n<p>H\u00e3y nh\u00ecn v\u00e0o hai trang d\u01b0\u1edbi \u0111\u00e2y. M\u1ed9t trang kh\u00f4ng s\u1eed d\u1ee5ng JavaScript nh\u01b0 l\u00e0 th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i c\u1ee7a trang, c\u00f2n trang kh\u00e1c th\u00ec c\u00f3.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/02\/chuc-nang-cot-loi-javascript.png\" alt=\"ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i javascript\" class=\"wp-image-11793\"\/><\/figure><\/div>\n\n\n<p>Gi\u1edd ch\u00fang ta h\u00e3y nh\u00ecn chi ti\u1ebft h\u01a1n v\u00e0o m\u1ed7i trang n\u00e0y&#8230;<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"7_Trang_cho_muc_dich_hien_thi_bai_viet\"><\/span>#7. Trang cho m\u1ee5c \u0111\u00edch hi\u1ec3n th\u1ecb b\u00e0i vi\u1ebft<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>N\u1ebfu ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i c\u1ee7a trang l\u00e0 hi\u1ec3n th\u1ecb b\u00e0i vi\u1ebft cho m\u1ecdi ng\u01b0\u1eddi v\u00e0 JavaScript c\u1ee7a trang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 hi\u1ec3n th\u1ecb qu\u1ea3ng c\u00e1o, n\u00fat b\u1ea5m m\u1ea1ng x\u00e3 h\u1ed9i, v\u00e2n v\u00e2n th\u1ebf th\u00ec \u0111i\u1ec1u quan tr\u1ecdng c\u1ea7n ph\u1ea3i hi\u1ec3u l\u00e0 JavaScript kh\u00f4ng ph\u1ea3i l\u00e0 ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i c\u1ee7a trang.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/02\/chuc-nang-cot-loi-bai-viet.png\" alt=\"ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i c\u1ee7a b\u00e0i vi\u1ebft\" class=\"wp-image-11794\"\/><\/figure><\/div>\n\n\n<ul><li>\u0110i\u1ec1u n\u00e0y ngh\u0129a l\u00e0 JavaScript n\u00ean \u0111\u01b0\u1ee3c tr\u00ec ho\u00e3n v\u00e0 ho\u00e0n to\u00e0n lo\u1ea1i b\u1ecf \u0111\u01b0\u1ee3c kh\u1ecfi tuy\u1ebfn hi\u1ec3n th\u1ecb quan tr\u1ecdng.<\/li><\/ul>\n\n\n\n<p>Lo\u1ea1i b\u1ecf JavaScript kh\u1ecfi tuy\u1ebfn hi\u1ec3n th\u1ecb quan tr\u1ecdng trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang (ng\u01b0\u1eddi d\u00f9ng nh\u00ecn th\u1ea5y b\u00e0i vi\u1ebft) nhanh nh\u1ea5t c\u00f3 th\u1ec3.<\/p>\n\n\n\n<p>Thay v\u00e0o \u0111\u00f3, n\u1ebfu ch\u00fang ta s\u1eed d\u1ee5ng JavaScript async (kh\u00f4ng \u0111\u1ed3ng b\u1ed9), th\u00ec ch\u00fang ta s\u1ebd t\u1ea1o th\u00eam \u0111\u1ed9 ph\u1ee9c t\u1ea1p, t\u0103ng th\u1eddi gian t\u1ea3i xu\u1ed1ng v\u00e0 th\u1eddi gian n\u00e0y l\u00e0m ch\u1eadm ng\u01b0\u1eddi d\u00f9ng \u0111\u1ea1t \u0111\u1ebfn \u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c c\u1ee7a trang.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"8_Trang_dat_phong_khach_san\"><\/span>#8. Trang \u0111\u1eb7t ph\u00f2ng kh\u00e1ch s\u1ea1n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>N\u1ebfu ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i c\u1ee7a trang l\u00e0 cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng \u0111\u1eb7t ph\u00f2ng kh\u00e1ch s\u1ea1n b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng widget\/\u1ee9ng d\u1ee5ng (app), m\u00e0 ch\u00fang ph\u1ee5 thu\u1ed9c v\u00e0o JavaScript, th\u1ebf th\u00ec \u0111i\u1ec1u quan tr\u1ecdng c\u1ea7n ph\u1ea3i hi\u1ec3u r\u1eb1ng JavaScript l\u00e0 th\u00e0nh ph\u1ea7n quan tr\u1ecdng c\u1ee7a ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i tr\u00ean trang.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2019\/02\/app-chuc-nang-cot-loi.png\" alt=\"ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i tr\u00ean trang\" class=\"wp-image-11795\"\/><\/figure><\/div>\n\n\n<ul><li>\u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 JavaScript ph\u1ea3i \u0111\u01b0\u1ee3c t\u1ea3i xu\u1ed1ng c\u00e0ng s\u1edbm c\u00e0ng t\u1ed1t v\u00e0 JavaScript t\u1ea3i kh\u00f4ng \u0111\u1ed3ng b\u1ed9 trong tuy\u1ebfn hi\u1ec3n th\u1ecb quan tr\u1ecdng (critical rendering path) l\u00e0 tuy\u1ec7t \u0111\u1ed1i c\u1ea7n thi\u1ebft.<\/li><\/ul>\n\n\n\n<p>Tr\u00ec ho\u00e3n t\u1ea3i JavaScript s\u1ebd d\u1eabn \u0111\u1ebfn h\u1eadu qu\u1ea3 tr\u00ec ho\u00e3n \u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang, ng\u0103n ng\u01b0\u1eddi d\u00f9ng kh\u00f4ng \u0111\u1eb7t ph\u00f2ng kh\u00e1ch s\u1ea1n \u0111\u01b0\u1ee3c.<\/p>\n\n\n\n<p>Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, c\u00e1ch th\u1ee9c nhanh nh\u1ea5t \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c \u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang l\u00e0 bao g\u1ed3m JavaScript v\u00e0o trong tuy\u1ebfn hi\u1ec3n th\u1ecb quan tr\u1ecdng, v\u00ec n\u00f3 c\u1ea7n thi\u1ebft cho ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i c\u1ee7a trang.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"9_Tri_hoan_defer_va_tai_khong_dong_bo_async\"><\/span>#9. Tr\u00ec ho\u00e3n (defer) v\u00e0 t\u1ea3i kh\u00f4ng \u0111\u1ed3ng b\u1ed9 (async)?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>S\u1ebd l\u00e0 kh\u00f4ng kh\u00f4n ngoan khi xem x\u00e9t \u0111\u1ec1 xu\u1ea5t s\u1eed d\u1ee5ng JavaScript m\u00e0 tr\u01b0\u1edbc \u0111\u00f3 kh\u00f4ng \u0111\u00e1nh gi\u00e1 \u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang.<\/p>\n\n\n\n<ul><li>N\u1ebfu ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i y\u00eau c\u1ea7u JavaScript, t\u1ea3i kh\u00f4ng \u0111\u1ed3ng b\u1ed9 l\u00e0 t\u1ed1t nh\u1ea5t.<\/li><li>N\u1ebfu ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i kh\u00f4ng y\u00eau c\u1ea7u JavaScript, th\u00ec JavaScript n\u00ean \u0111\u01b0\u1ee3c \u0111\u01b0a ra ngo\u00e0i tuy\u1ebfn hi\u1ec3n th\u1ecb quan tr\u1ecdng.<\/li><\/ul>\n\n\n\n<p>To\u00e0n b\u1ed9 m\u1ee5c \u0111\u00edch c\u1ee7a \u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang l\u00e0 nh\u1ea5n m\u1ea1nh r\u1eb1ng vi\u1ec7c <em>t\u1ed1i \u01b0u h\u00f3a t\u1ed1c \u0111\u1ed9 t\u1ea3i trang ph\u1ea3i d\u1ef1a tr\u00ean ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i c\u1ee7a trang<\/em>.<\/p>\n\n\n\n<p>M\u1ecdi th\u1ee9 ph\u1ea3i d\u1ef1a tr\u00ean m\u1ed9t c\u00e2u h\u1ecfi: L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 ng\u01b0\u1eddi d\u00f9ng th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c \u0111i\u1ec1u h\u1ecd mu\u1ed1n l\u00e0m theo c\u00e1ch nhanh nh\u1ea5t c\u00f3 th\u1ec3?<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"10_Tat_ca_moi_can_nhac_ve_toc_do_trang_phai_phu_thuoc_vao_diem_tuong_tac_tren_trang\"><\/span>#10. T\u1ea5t c\u1ea3 m\u1ecdi c\u00e2n nh\u1eafc v\u1ec1 t\u1ed1c \u0111\u1ed9 trang ph\u1ea3i ph\u1ee5 thu\u1ed9c v\u00e0o \u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Kh\u00f4ng s\u1eed d\u1ee5ng b\u1ea5t k\u1ef3 l\u1eddi khuy\u1ebfn ngh\u1ecb n\u00e0o v\u1ec1 c\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9 trang m\u00e0 kh\u00f4ng xem x\u00e9t \u0111\u1ebfn ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i c\u1ee7a trang.<\/p>\n\n\n\n<p>M\u1ee5c ti\u00eau tr\u00ean h\u1ebft l\u00e0 ph\u1ea3i c\u00f3 \u0111\u01b0\u1ee3c \u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang nhanh nh\u1ea5t c\u00f3 th\u1ec3 (ng\u01b0\u1eddi d\u00f9ng th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c nh\u1eefng \u0111i\u1ec1u h\u1ecd mu\u1ed1n nhanh nh\u1ea5t c\u00f3 th\u1ec3).<\/p>\n\n\n\n<p>Xem th\u00eam v\u1ec1 <a href=\"https:\/\/kiencang.net\/tai-javascript-defer-async\/\" target=\"_blank\" rel=\"noreferrer noopener\">async v\u00e0 defer JavaScript<\/a> \u1edf b\u00e0i vi\u1ebft n\u00e0y.<\/p>\n\n\n\n<p><em>(D\u1ecbch t\u1eeb b\u00e0i vi\u1ebft: Page interaction point \u2013 T\u00e1c gi\u1ea3: Patrick Sexton \u2013 Website: Varvy)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>#1. \u0110i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang (website) l\u00e0 g\u00ec? \u0110i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang (page interaction page) l\u00e0 kho\u1ea3nh kh\u1eafc ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i (core functionality) c\u1ee7a m\u1ed9t trang web. Kh\u1ea3 n\u0103ng t\u01b0\u01a1ng t\u00e1c (interaction) ngh\u0129a l\u00e0 th\u1ea5y n\u1ed9i dung v\u00e0&nbsp;c\u00f3 kh\u1ea3 n\u0103ng t\u01b0\u01a1ng t\u00e1c v\u1edbi n\u00f3 (click &hellip;<\/p>\n","protected":false},"author":1,"featured_media":20447,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[293],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Xem x\u00e9t &quot;\u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c&quot; tr\u00ean trang khi t\u0103ng t\u1ed1c Website &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kiencang.net\/diem-tuong-tac-trang\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Xem x\u00e9t &quot;\u0111i\u1ec3m t\u01b0\u01a1ng t\u00e1c&quot; tr\u00ean trang khi t\u0103ng t\u1ed1c Website &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"#1. \u0110i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang (website) l\u00e0 g\u00ec? \u0110i\u1ec3m t\u01b0\u01a1ng t\u00e1c tr\u00ean trang (page interaction page) l\u00e0 kho\u1ea3nh kh\u1eafc ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 t\u01b0\u01a1ng t\u00e1c v\u1edbi ch\u1ee9c n\u0103ng c\u1ed1t l\u00f5i (core functionality) c\u1ee7a m\u1ed9t trang web. 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