{"id":2041,"date":"2022-06-28T11:13:26","date_gmt":"2022-06-28T11:13:26","guid":{"rendered":"https:\/\/topviecit.vn\/blog\/?p=2041"},"modified":"2022-06-28T11:13:43","modified_gmt":"2022-06-28T11:13:43","slug":"bo-cau-hoi-phong-van-front-end","status":"publish","type":"post","link":"https:\/\/topviecit.vn\/blog\/bo-cau-hoi-phong-van-front-end\/","title":{"rendered":"T\u1ed5ng h\u1ee3p c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n front end th\u01b0\u1eddng g\u1eb7p nh\u1ea5t"},"content":{"rendered":"\n<p>M\u1ee9c thu nh\u1eadp cho v\u1ecb tr\u00ed front-end developer ng\u00e0y c\u00e0ng cao k\u00e9o theo s\u1ed1 l\u01b0\u1ee3ng ng\u01b0\u1eddi mu\u1ed1n \u1ee9ng tuy\u1ec3n v\u00e0o v\u1ecb tr\u00ed n\u00e0y c\u0169ng t\u0103ng l\u00ean. N\u1ebfu b\u1ea1n \u0111ang c\u00f3 \u00fd \u0111\u1ecbnh xin vi\u1ec7c \u1edf v\u1ecb tr\u00ed front end developer, v\u1eady th\u00ec \u0111\u1eebng b\u1ecf qua b\u1ed9 <strong>c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n front end<\/strong> th\u01b0\u1eddng g\u1eb7p nh\u1ea5t d\u01b0\u1edbi \u0111\u00e2y c\u00f9ng <strong><a href=\"https:\/\/topviecit.vn\/\" target=\"_blank\" rel=\"noreferrer noopener\">topviecit.vn<\/a><\/strong> nh\u00e9!<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_63 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/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\"><span class=\"ez-toc-js-icon-con\"><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><\/span><\/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:\/\/topviecit.vn\/blog\/bo-cau-hoi-phong-van-front-end\/#Mot_so_kien_thuc_chinh_co_trong_cau_hoi_phong_van_front_end_developer\" title=\"M\u1ed9t s\u1ed1 ki\u1ebfn th\u1ee9c ch\u00ednh c\u00f3 trong c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n front end developer\">M\u1ed9t s\u1ed1 ki\u1ebfn th\u1ee9c ch\u00ednh c\u00f3 trong c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n front end developer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/topviecit.vn\/blog\/bo-cau-hoi-phong-van-front-end\/#Tong_hop_cac_cau_hoi_phong_van_front_end_hay_xuat_hien_trong_bai_kiem_tra\" title=\"T\u1ed5ng h\u1ee3p c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n front end hay xu\u1ea5t hi\u1ec7n trong b\u00e0i ki\u1ec3m tra\">T\u1ed5ng h\u1ee3p c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n front end hay xu\u1ea5t hi\u1ec7n trong b\u00e0i ki\u1ec3m tra<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/topviecit.vn\/blog\/bo-cau-hoi-phong-van-front-end\/#Doctype_trong_html_la_gi_Co_may_loai_Doctypes\" title=\"Doctype trong html l\u00e0 g\u00ec? C\u00f3 m\u1ea5y lo\u1ea1i Doctypes&nbsp;\">Doctype trong html l\u00e0 g\u00ec? C\u00f3 m\u1ea5y lo\u1ea1i Doctypes&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/topviecit.vn\/blog\/bo-cau-hoi-phong-van-front-end\/#Thuoc_tinh_data_la_gi\" title=\"Thu\u1ed9c t\u00ednh data l\u00e0 g\u00ec?\">Thu\u1ed9c t\u00ednh data l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/topviecit.vn\/blog\/bo-cau-hoi-phong-van-front-end\/#Cach_tao_public_key_trong_html\" title=\"C\u00e1ch t\u1ea1o public key trong html?\">C\u00e1ch t\u1ea1o public key trong html?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/topviecit.vn\/blog\/bo-cau-hoi-phong-van-front-end\/#CSS_la_gi\" title=\"CSS l\u00e0 g\u00ec?\">CSS l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/topviecit.vn\/blog\/bo-cau-hoi-phong-van-front-end\/#CSS_framework_la_gi\" title=\"CSS framework l\u00e0 g\u00ec?\">CSS framework l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/topviecit.vn\/blog\/bo-cau-hoi-phong-van-front-end\/#Mot_so_cach_tich_hop_CSS_vao_trang_HTML\" title=\"M\u1ed9t s\u1ed1 c\u00e1ch t\u00edch h\u1ee3p CSS v\u00e0o trang HTML\">M\u1ed9t s\u1ed1 c\u00e1ch t\u00edch h\u1ee3p CSS v\u00e0o trang HTML<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/topviecit.vn\/blog\/bo-cau-hoi-phong-van-front-end\/#Event_delegation_la_nhu_the_nao\" title=\"Event delegation l\u00e0 nh\u01b0 th\u1ebf n\u00e0o?\">Event delegation l\u00e0 nh\u01b0 th\u1ebf n\u00e0o?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/topviecit.vn\/blog\/bo-cau-hoi-phong-van-front-end\/#Danh_gia_uu_nhuoc_diem_cua_viec_su_dung_Ajax_la_gi\" title=\"\u0110\u00e1nh gi\u00e1 \u01b0u, nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a vi\u1ec7c s\u1eed d\u1ee5ng Ajax l\u00e0 g\u00ec?\">\u0110\u00e1nh gi\u00e1 \u01b0u, nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a vi\u1ec7c s\u1eed d\u1ee5ng Ajax l\u00e0 g\u00ec?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Mot_so_kien_thuc_chinh_co_trong_cau_hoi_phong_van_front_end_developer\"><\/span><strong>M\u1ed9t s\u1ed1 ki\u1ebfn th\u1ee9c ch\u00ednh c\u00f3 trong c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n front end developer<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 ki\u1ebfn th\u1ee9c ch\u00ednh s\u1ebd xu\u1ea5t hi\u1ec7n xuy\u00ean su\u1ed1t trong c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n front end m\u00e0 b\u1ea1n c\u1ea7n ch\u00fa \u00fd:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>B\u1ea1n ph\u1ea3i c\u00f3 m\u1ed9t s\u1ef1 am hi\u1ec3u v\u1ec1 ng\u00f4n ng\u1eef JavaScript, b\u00ean c\u1ea1nh \u0111\u00f3 c\u0169ng ph\u1ea3i l\u00e0m quen t\u1eeb t\u1eeb v\u1edbi c\u00e1c c\u00f4ng c\u1ee5 ph\u00e2n t\u00edch m\u00e3 t\u0129nh (static code analysis tool).<\/li><li>\u1ee8ng vi\u00ean c\u0169ng c\u1ea7n c\u00f3 ki\u1ebfn th\u1ee9c t\u1ed1t v\u1ec1 c\u00e1c frameworks, th\u01b0 vi\u1ec7n ph\u1ed5 bi\u1ebfn nh\u01b0 React, Angular, Vue.js,&#8230; t\u00f9y theo nhu c\u1ea7u c\u00f4ng vi\u1ec7c, c\u00f4ng ty m\u00e0 b\u1ea1n \u1ee9ng tuy\u1ec3n.<\/li><li>Th\u00e0nh th\u1ea1o HTML5 v\u00e0 CSS. C\u1ee5 th\u1ec3 ph\u1ea3i vi\u1ebft \u0111\u01b0\u1ee3c HTML ch\u00ednh x\u00e1c v\u1ec1 m\u1eb7t ng\u1eef ngh\u0129a, chuy\u1ec3n m\u1ed9t c\u00e1ch m\u01b0\u1ee3t m\u00e0 pixel c\u1ee7a c\u00e1c thi\u1ebft k\u1ebf th\u00e0nh CSS, \u0111\u1ed3ng th\u1eddi kh\u00f4ng qu\u00ean l\u01b0u t\u00e2m \u0111\u1ebfn chi ti\u1ebft, thi\u1ebft k\u1ebf responsive.<\/li><li>Kh\u1ea3 n\u0103ng giao ti\u1ebfp ti\u1ebfng Anh t\u1ed1t \u0111\u1ec3 c\u00f3 th\u1ec3 \u0111\u01b0a ra c\u00e1c lu\u1eadn \u0111i\u1ec3m c\u1ee7a m\u00ecnh trong c\u00f4ng vi\u1ec7c.<\/li><li>Ki\u1ebfn th\u1ee9c v\u1ec1 tr\u00ecnh duy\u1ec7t nh\u01b0 c\u00e1ch ch\u00fang ho\u1ea1t \u0111\u1ed9ng, c\u00e1c g\u1ee1 l\u1ed7i trong tr\u00ecnh duy\u1ec7t.<\/li><li>T\u1eebng c\u00f3 kinh nghi\u1ec7m c\u1ecd s\u00e1t v\u1edbi c\u00e1c API (Rest API v\u00e0 \/ ho\u1eb7c GraphQL), v\u1edbi GIT repo v\u00e0 ki\u1ec3m th\u1eed.<\/li><\/ul>\n\n\n\n<p><strong>>>>Xem th\u00eam: <a href=\"https:\/\/topviecit.vn\/blog\/tuyen-tap-nhung-cau-hoi-phong-van-front-end\/\" target=\"_blank\" rel=\"noreferrer noopener\">Tuy\u1ec3n t\u1eadp nh\u1eefng c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n Front End hay g\u1eb7p nh\u1ea5t<\/a><\/strong><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/06\/image.png\" alt=\"\u1ee8ng vi\u00ean t\u1eebng l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c API (Rest API v\u00e0 \/ ho\u1eb7c GraphQL)\" class=\"wp-image-2042\" srcset=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/06\/image.png 800w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/06\/image-640x400.png 640w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/06\/image-768x480.png 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption><em><em>\u1ee8ng vi\u00ean t\u1eebng l\u00e0m vi\u1ec7c v\u1edbi c\u00e1c API (Rest API v\u00e0 \/ ho\u1eb7c GraphQL)<\/em><\/em><\/figcaption><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tong_hop_cac_cau_hoi_phong_van_front_end_hay_xuat_hien_trong_bai_kiem_tra\"><\/span><strong>T\u1ed5ng h\u1ee3p c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n front end hay xu\u1ea5t hi\u1ec7n trong b\u00e0i ki\u1ec3m tra<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Doctype_trong_html_la_gi_Co_may_loai_Doctypes\"><\/span><strong>Doctype trong html l\u00e0 g\u00ec? C\u00f3 m\u1ea5y lo\u1ea1i Doctypes&nbsp;<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u0110\u00e2y l\u00e0 c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n front end c\u00f3 t\u1ea7n su\u1ea5t xu\u1ea5t hi\u1ec7n kh\u00e1 d\u00e0y \u0111\u1eb7c trong b\u00e0i test m\u00e0 b\u1ea1n c\u1ea7n l\u01b0u \u00fd. Khai b\u00e1o t\u00e0i li\u1ec7u theo ki\u1ec3u HTML, ch\u00ednh l\u00e0 DOCTYPE. \u0110\u00e2y l\u00e0 d\u00f2ng m\u00e3 \u0111\u1ea7u ti\u00ean b\u1eaft bu\u1ed9c ph\u1ea3i c\u00f3 trong m\u1ecdi t\u00e0i li\u1ec7u HTML ho\u1eb7c XHTML.<\/p>\n\n\n\n<p>Hi\u1ec3u m\u1ed9t c\u00e1ch \u0111\u01a1n gi\u1ea3n, khai b\u00e1o DOCTYPE l\u00e0 m\u1ed9t h\u01b0\u1edbng d\u1eabn tr\u00ecnh duy\u1ec7t web theo phi\u00ean b\u1ea3n HTML m\u00e0 trang vi\u1ebft \u0111\u1ec3 ch\u1eafc ch\u1eafn r\u1eb1ng trang web \u0111\u01b0\u1ee3c ph\u00e2n t\u00edch c\u00fa ph\u00e1p nh\u01b0 nhau d\u00f9 tr\u00ean c\u00e1c tr\u00ecnh duy\u1ec7t web kh\u00e1c nhau.<\/p>\n\n\n\n<p>&lt;!DOCTYPE html&gt;<\/p>\n\n\n\n<p>&lt;meta charset=&#8221;UTF-8&#8243;&gt;<\/p>\n\n\n\n<p>Hi\u1ec7n nay Doctypes \u0111\u01b0\u1ee3c chia th\u00e0nh 3 lo\u1ea1i kh\u00e1c nhau l\u00e0: Strict Doctype, Transitional Doctype, Frameset Doctype<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Thuoc_tinh_data_la_gi\"><\/span><strong>Thu\u1ed9c t\u00ednh data l\u00e0 g\u00ec?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Thu\u1ed9c t\u00ednh data l\u00e0 c\u00e1i gi\u00fap b\u1ea1n l\u01b0u th\u00eam th\u00f4ng tin, d\u1eef li\u1ec7u trong DOM. Nh\u1edd v\u1eady b\u1ea1n c\u00f3 th\u1ec3 vi\u1ebft html h\u1ee3p l\u1ec7 v\u1edbi embedded private data, \u0111\u1ed3ng th\u1eddi d\u1ec5 d\u00e0ng truy c\u1eadp thu\u1ed9c t\u00ednh d\u1eef li\u1ec7u khi s\u1eed d\u1ee5ng&nbsp; javascript. \u0110\u00f3 l\u00e0 l\u00fd do nhi\u1ec1u th\u01b0 vi\u1ec7n nh\u01b0 knockout \u1ee9ng d\u1ee5ng n\u00f3.<\/p>\n\n\n\n<p>&lt;div id=&#8221;myDiv&#8221; data-user=&#8221;jsDude&#8221; data-list-size=&#8221;5&#8243; data-maxage=&#8221;180&#8243;&gt;&lt;\/div&gt;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cach_tao_public_key_trong_html\"><\/span><strong>C\u00e1ch t\u1ea1o public key trong html?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Th\u1ef1c t\u1ebf, trong html c\u00f3 ph\u1ea7n t\u1eed keygen, nh\u1edd v\u1eady m\u00e0 c\u00f3 th\u1ec3 t\u1ea1o kh\u00f3a v\u00e0 g\u1eedi th\u00f4ng qua bi\u1ec3u m\u1eabu (form).<\/p>\n\n\n\n<p>&lt;keygen name=&#8221;name&#8221; challenge=&#8221;challenge string&#8221; keytype=&#8221;type&#8221; keyparams=&#8221;pqg-params&#8221;&gt;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"CSS_la_gi\"><\/span><strong>CSS l\u00e0 g\u00ec?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>CSS ch\u00ednh l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a Cascading Style Sheet. \u0110\u00e2y l\u00e0 m\u1ed9t ng\u00f4n ng\u1eef t\u1ea1o ki\u1ec3u th\u01b0\u1eddng g\u1eb7p \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng c\u00f9ng v\u1edbi&nbsp; HTML nh\u1eb1m thi\u1ebft k\u1ebf c\u00e1c trang web. Ngo\u00e0i ra n\u00f3 c\u0169ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u1edbi c\u00e1c t\u00e0i li\u1ec7u XML b\u1ea5t k\u1ef3 bao g\u1ed3m XML thu\u1ea7n t\u00fay, SVG v\u00e0 XUL.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"CSS_framework_la_gi\"><\/span><strong>CSS framework l\u00e0 g\u00ec?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Th\u1ef1c t\u1ebf, CSS framework bao g\u1ed3m c\u00e1c b\u1ea3ng \u0111\u1ecbnh ki\u1ec3u ( stylesheets) CSS s\u1eb5n s\u00e0ng, cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n v\u00e0 nh\u00e0 thi\u1ebft k\u1ebf web d\u00f9ng.&nbsp;<\/p>\n\n\n\n<p>V\u00e0 c\u00e1c b\u1ea3ng n\u00e0y \u0111\u01b0\u1ee3c chu\u1ea9n b\u1ecb \u0111\u1ec3 s\u1eed d\u1ee5ng cho m\u1ee5c \u0111\u00edch thi\u1ebft k\u1ebf ra c\u00e1c web ti\u00eau chu\u1ea9n v\u1ec1 m\u00e0u s\u1eafc, b\u1ed1 c\u1ee5c, ph\u00f4ng ch\u1eef, thanh \u0111i\u1ec1u h\u01b0\u1edbng,&#8230;.<\/p>\n\n\n\n<p>Nh\u1edd CSS framework m\u00e0 ng\u01b0\u1eddi d\u00f9ng s\u1edf h\u1eefu m\u1ed9t bi\u1ec3u \u0111\u1ecbnh ki\u1ec3u CSS ho\u00e0n ch\u1ec9nh, l\u00fac n\u00e0y h\u1ecd ch\u1ec9 c\u1ea7n vi\u1ebft code HTML v\u1edbi c\u00e1c l\u1edbp, c\u1ea5u tr\u00fac v\u00e0 ID ch\u00ednh x\u00e1c l\u00e0 \u0111\u00e3 c\u00f3 th\u1ec3 d\u1ef1ng l\u00ean m\u1ed9t website r\u1ed3i. L\u00fd do l\u00e0 v\u00ec trong CSS framework \u0111\u00e3 \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p s\u1eb5n l\u1edbp cho c\u00e1c ph\u1ea7n t\u1eed trang web ph\u1ed5 bi\u1ebfn t\u1eeb ch\u00e2n trang, thanh tr\u01b0\u1ee3t, thanh \u0111i\u1ec1u h\u01b0\u1edbng, b\u1ed1 c\u1ee5c c\u1ed9t,&#8230;<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/06\/image-1.png\" alt=\"M\u1ed9t s\u1ed1 c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n front end th\u01b0\u1eddng g\u1eb7p nh\u1ea5t\" class=\"wp-image-2043\" srcset=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/06\/image-1.png 800w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/06\/image-1-640x400.png 640w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/06\/image-1-768x480.png 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption><em><em>M\u1ed9t s\u1ed1 c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n front end th\u01b0\u1eddng g\u1eb7p nh\u1ea5t<\/em><\/em><\/figcaption><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Mot_so_cach_tich_hop_CSS_vao_trang_HTML\"><\/span><strong>M\u1ed9t s\u1ed1 c\u00e1ch t\u00edch h\u1ee3p CSS v\u00e0o trang HTML<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>C\u00f3 3 c\u00e1ch \u0111\u1ec3 t\u00edch h\u1ee3p CSS v\u00e0o trang HTML \u0111\u00f3 l\u00e0:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u0110\u1ea7u ti\u00ean l\u00e0 b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c style-tags \u1edf head c\u1ee7a trang HTML.<\/li><li>Hai l\u00e0 t\u00edch h\u1ee3p b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng inline-styling.<\/li><li>C\u00e1ch cu\u1ed1i c\u00f9ng l\u00e0 vi\u1ebft CSS trong m\u1ed9t t\u1eadp tin ri\u00eang bi\u1ec7t, sau \u0111\u00f3 th\u00eam v\u00e0o trang HTML qua th\u1ebb li\u00ean k\u1ebft.<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Event_delegation_la_nhu_the_nao\"><\/span><strong>Event delegation l\u00e0 nh\u01b0 th\u1ebf n\u00e0o?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>B\u1ea1n c\u1ea7n l\u01b0u l\u1ea1i c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n front end v\u1ec1 l\u0129nh v\u1ef1c n\u00e0y v\u00ec \u0111\u00e2y l\u00e0 c\u00e2u th\u01b0\u1eddng l\u1eb7p l\u1ea1i nhi\u1ec1u l\u1ea7n trong b\u00e0i test. Th\u1ef1c ch\u1ea5t Event delegation l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt \u0111\u01b0\u1ee3c d\u00f9ng khi th\u00eam event listeners v\u00e0o m\u1ed9t ph\u1ea7n t\u1eed m\u1eb9 m\u00e0 kh\u00f4ng ph\u1ea3i th\u00eam ch\u00fang v\u00e0o c\u00e1c ph\u1ea7n t\u1eed con. L\u00fac n\u00e0y listeners s\u1ebd th\u1ef1c hi\u1ec7n kh\u1edfi \u0111\u1ed9ng b\u1ea5t c\u1ee9 l\u00fac n\u00e0o s\u1ef1 ki\u1ec7n \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t tr\u00ean c\u00e1c ph\u1ea7n t\u1eed con. \u01afu \u0111i\u1ec3m c\u1ee7a k\u1ef9 thu\u1eadt n\u00e0y l\u00e0:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Nh\u1edd v\u1eady m\u00e0 Memory footprint gi\u1ea3m xu\u1ed1ng, nguy\u00ean nh\u00e2n l\u00e0 v\u00ec ch\u1ec9 c\u1ea7n m\u1ed9t tr\u00ecnh x\u1eed l\u00fd duy nh\u1ea5t tr\u00ean ph\u1ea7n t\u1eed m\u1eb9.<\/li><li>Kh\u00f4ng ph\u1ea3i th\u1ef1c hi\u1ec7n h\u1ee7y li\u00ean k\u1ebft tr\u00ecnh x\u1eed l\u00fd kh\u1ecfi c\u00e1c ph\u1ea7n t\u1eed b\u1ecb x\u00f3a v\u00e0 ti\u1ebfn h\u00e0nh li\u00ean k\u1ebft s\u1ef1 ki\u1ec7n cho c\u00e1c ph\u1ea7n t\u1eed m\u1edbi.<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Danh_gia_uu_nhuoc_diem_cua_viec_su_dung_Ajax_la_gi\"><\/span><strong>\u0110\u00e1nh gi\u00e1 \u01b0u, nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a vi\u1ec7c s\u1eed d\u1ee5ng Ajax l\u00e0 g\u00ec?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u01afu, nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a vi\u1ec7c s\u1eed d\u1ee5ng Ajax \u0111\u00f3 l\u00e0:<\/p>\n\n\n\n<p><em>\u01afu \u0111i\u1ec3m<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Kh\u1ea3 n\u0103ng t\u01b0\u01a1ng t\u00e1c t\u1ed1t h\u01a1n, \u0111\u1ed3ng ngh\u0129a n\u1ed9i dung m\u1edbi t\u1eeb m\u00e1y ch\u1ee7 s\u1ebd thay \u0111\u1ed5i \u0111\u1ed9ng m\u00e0 kh\u00f4ng ph\u1ea3i t\u1ea3i l\u1ea1i to\u00e0n b\u1ed9 trang.<\/li><li>Gi\u1ea3m kh\u1ea3 n\u0103ng k\u1ebft n\u1ed1i \u0111\u1ebfn m\u00e1y ch\u1ee7. L\u00fd do l\u00e0 t\u1eadp l\u1ec7nh v\u00e0 bi\u1ec3u \u0111\u1ecbnh ki\u1ec3u ch\u1ec9 b\u1eaft bu\u1ed9c ph\u1ea3i \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u m\u1ed9t l\u1ea7n.<\/li><li>Tr\u1ea1ng th\u00e1i s\u1ebd duy tr\u00ec tr\u00ean m\u1ed9t trang. Do v\u1eady c\u00e1c bi\u1ebfn JavaScript v\u00e0 tr\u1ea1ng th\u00e1i DOM v\u1eabn c\u00f2n, nguy\u00ean nh\u00e2n l\u00e0 b\u1edfi trang v\u00f9ng ch\u1ee9a ch\u00ednh kh\u00f4ng \u0111\u01b0\u1ee3c t\u1ea3i l\u1ea1i.<\/li><\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/06\/image-2.png\" alt=\"Ajax l\u00e0m gi\u1ea3m kh\u1ea3 n\u0103ng k\u1ebft n\u1ed1i \u0111\u1ebfn m\u00e1y ch\u1ee7.\" class=\"wp-image-2044\" srcset=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/06\/image-2.png 800w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/06\/image-2-640x400.png 640w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/06\/image-2-768x480.png 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption><em><em>Ajax l\u00e0m gi\u1ea3m kh\u1ea3 n\u0103ng k\u1ebft n\u1ed1i \u0111\u1ebfn m\u00e1y ch\u1ee7.<\/em><\/em><\/figcaption><\/figure><\/div>\n\n\n<p><em>Nh\u01b0\u1ee3c \u0111i\u1ec3m&nbsp;<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Kh\u00f3 \u0111\u00e1nh d\u1ea5u c\u00e1c trang web \u0111\u1ed9ng h\u01a1n.<\/li><li>D\u1eebng ho\u1ea1t \u0111\u1ed9ng trong tr\u01b0\u1eddng h\u1ee3p JavaScript \u0111\u00e3 b\u1ecb t\u1eaft trong tr\u00ecnh duy\u1ec7t.<\/li><li>N\u1ebfu tr\u00ecnh duy\u1ec7t web kh\u00f4ng th\u1ef1c thi JavaScript, \u0111\u1ed3ng ngh\u0129a ta kh\u00f4ng nh\u00ecn th\u1ea5y n\u1ed9i dung \u0111\u01b0\u1ee3c t\u1ea3i b\u1edfi JavaScript.<\/li><li>Mu\u1ed1n t\u00ecm n\u1ea1p d\u1eef li\u1ec7u ph\u1ea3i k\u1ebft h\u1ee3p d\u1eef li\u1ec7u t\u1eeb xa \u0111\u00e3 t\u00ecm n\u1ea1p v\u1edbi c\u00e1c m\u1eabu ph\u00eda m\u00e1y kh\u00e1ch th\u00ec m\u1edbi c\u00f3 th\u1ec3 c\u1eadp nh\u1eadt DOM.&nbsp;<\/li><\/ul>\n\n\n\n<p>Tr\u00ean \u0111\u00e2y l\u00e0 b\u1ed9 c\u00e1c <a href=\"https:\/\/topviecit.vn\/blog\/bo-cau-hoi-phong-van-front-end\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n front end<\/strong><\/a> th\u01b0\u1eddng g\u1eb7p nh\u1ea5t. Mong r\u1eb1ng ch\u00fang s\u1ebd gi\u00fap b\u1ea1n v\u01b0\u1ee3t qua k\u1ef3 thi s\u1eafp t\u1edbi, ch\u00fac b\u1ea1n th\u00e0nh c\u00f4ng!<\/p>\n\n\n\n<p><strong>>>>Xem th\u00eam: <a href=\"https:\/\/topviecit.vn\/blog\/lap-trinh-front-end-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">S\u1ef1 kh\u00e1c nhau gi\u1eefa l\u1eadp tr\u00ecnh Back end v\u00e0 l\u1eadp tr\u00ecnh Front end l\u00e0 g\u00ec?<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>M\u1ee9c thu nh\u1eadp cho v\u1ecb tr\u00ed front-end developer ng\u00e0y c\u00e0ng cao k\u00e9o theo s\u1ed1 l\u01b0\u1ee3ng ng\u01b0\u1eddi mu\u1ed1n \u1ee9ng tuy\u1ec3n v\u00e0o v\u1ecb tr\u00ed n\u00e0y c\u0169ng t\u0103ng l\u00ean. N\u1ebfu b\u1ea1n \u0111ang c\u00f3 \u00fd \u0111\u1ecbnh xin vi\u1ec7c \u1edf v\u1ecb tr\u00ed front end developer, v\u1eady th\u00ec \u0111\u1eebng b\u1ecf qua b\u1ed9 c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n front end th\u01b0\u1eddng g\u1eb7p nh\u1ea5t [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2045,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"cybocfi_hide_featured_image":"","footnotes":""},"categories":[86],"tags":[460,45,456,461],"class_list":["post-2041","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chia-se-kinh-nghiem","tag-bo-cau-hoi-phong-van","tag-cau-hoi-phong-van-front-end","tag-kinh-nghiem-phong-van","tag-phong-van-it"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>T\u1ed5ng h\u1ee3p c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n front end th\u01b0\u1eddng g\u1eb7p nh\u1ea5t<\/title>\n<meta name=\"description\" content=\"N\u1ebfu b\u1ea1n \u0111ang c\u00f3 \u00fd \u0111\u1ecbnh xin vi\u1ec7c \u1edf v\u1ecb tr\u00ed front end developer, v\u1eady th\u00ec \u0111\u1eebng b\u1ecf qua b\u1ed9 c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n front end th\u01b0\u1eddng g\u1eb7p ngay sau \u0111\u00e2y nh\u00e9\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/topviecit.vn\/blog\/bo-cau-hoi-phong-van-front-end\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"T\u1ed5ng h\u1ee3p c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n front end th\u01b0\u1eddng g\u1eb7p nh\u1ea5t\" \/>\n<meta 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