{"id":2860,"date":"2022-11-16T03:57:21","date_gmt":"2022-11-16T03:57:21","guid":{"rendered":"https:\/\/topviecit.vn\/blog\/?p=2860"},"modified":"2023-01-10T04:45:51","modified_gmt":"2023-01-10T04:45:51","slug":"phong-van-javascript","status":"publish","type":"post","link":"https:\/\/topviecit.vn\/blog\/phong-van-javascript\/","title":{"rendered":"Top 10 c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n JavaScript cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u"},"content":{"rendered":"\n<p>L\u1eadp tr\u00ecnh vi\u00ean JavaScript l\u00e0 m\u1ed9t v\u1ecb tr\u00ed quan tr\u1ecdng v\u00e0 \u0111\u01b0\u1ee3c tuy\u1ec3n d\u1ee5ng ph\u1ed5 bi\u1ebfn trong l\u0129nh v\u1ef1c IT. H\u00e3y c\u00f9ng tham kh\u1ea3o ngay 10 c\u00e2u h\u1ecfi <strong><a href=\"https:\/\/topviecit.vn\/blog\/phong-van-javascript\/\" target=\"_blank\" rel=\"noreferrer noopener\">ph\u1ecfng v\u1ea5n JavaScript<\/a><\/strong> sau \u0111\u00e2y n\u1ebfu b\u1ea1n c\u00f3 bu\u1ed5i ph\u1ecfng v\u1ea5n s\u1eafp t\u1edbi c\u00f9ng <a href=\"https:\/\/topviecit.vn\/\"><strong>Top<\/strong><\/a><strong><a href=\"https:\/\/topviecit.vn\/\" target=\"_blank\" rel=\"noreferrer noopener\">v<\/a><\/strong><a href=\"https:\/\/topviecit.vn\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>iecIT<\/strong><\/a> 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\/phong-van-javascript\/#Cau_1_Ban_hieu_gi_ve_lap_trinh_JavaScript\" title=\"C\u00e2u 1: B\u1ea1n hi\u1ec3u g\u00ec v\u1ec1 l\u1eadp tr\u00ecnh JavaScript?\">C\u00e2u 1: B\u1ea1n hi\u1ec3u g\u00ec v\u1ec1 l\u1eadp tr\u00ecnh JavaScript?<\/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\/phong-van-javascript\/#Cau_2_Hay_neu_ten_mot_so_du_lieu_co_ban_co_trong_JavaScript\" title=\"C\u00e2u 2: H\u00e3y n\u00eau t\u00ean m\u1ed9t s\u1ed1 d\u1eef li\u1ec7u c\u01a1 b\u1ea3n c\u00f3 trong JavaScript?\">C\u00e2u 2: H\u00e3y n\u00eau t\u00ean m\u1ed9t s\u1ed1 d\u1eef li\u1ec7u c\u01a1 b\u1ea3n c\u00f3 trong JavaScript?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/topviecit.vn\/blog\/phong-van-javascript\/#Cau_3_Ban_co_the_neu_su_khac_nhau_cua_Java_va_JavaScript_khong\" title=\"C\u00e2u 3: B\u1ea1n c\u00f3 th\u1ec3 n\u00eau s\u1ef1 kh\u00e1c nhau c\u1ee7a Java v\u00e0 JavaScript kh\u00f4ng?\">C\u00e2u 3: B\u1ea1n c\u00f3 th\u1ec3 n\u00eau s\u1ef1 kh\u00e1c nhau c\u1ee7a Java v\u00e0 JavaScript kh\u00f4ng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/topviecit.vn\/blog\/phong-van-javascript\/#Cau_4_Su_dung_%E2%80%9Cuse_strict%E2%80%9D_trong_JavaScript_co_nghia_la_gi\" title=\"C\u00e2u 4: S\u1eed d\u1ee5ng \u201cuse strict\u201d trong JavaScript c\u00f3 ngh\u0129a l\u00e0 g\u00ec?\">C\u00e2u 4: S\u1eed d\u1ee5ng \u201cuse strict\u201d trong JavaScript c\u00f3 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-5\" href=\"https:\/\/topviecit.vn\/blog\/phong-van-javascript\/#Cau_5_Hoisting_trong_JavaScript_se_duoc_xay_ra_nhu_the_nao\" title=\"C\u00e2u 5: Hoisting trong JavaScript s\u1ebd \u0111\u01b0\u1ee3c x\u1ea3y ra nh\u01b0 th\u1ebf n\u00e0o?\">C\u00e2u 5: Hoisting trong JavaScript s\u1ebd \u0111\u01b0\u1ee3c x\u1ea3y ra nh\u01b0 th\u1ebf n\u00e0o?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/topviecit.vn\/blog\/phong-van-javascript\/#Cau_6_Tinh_tuong_tac_bang_tham_chieu_trong_JavaScript_la_gi\" title=\"C\u00e2u 6: T\u00ednh t\u01b0\u01a1ng t\u00e1c b\u1eb1ng tham chi\u1ebfu trong JavaScript l\u00e0 g\u00ec?\">C\u00e2u 6: T\u00ednh t\u01b0\u01a1ng t\u00e1c b\u1eb1ng tham chi\u1ebfu trong JavaScript 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-7\" href=\"https:\/\/topviecit.vn\/blog\/phong-van-javascript\/#Cau_7_Ban_hieu_nhu_the_nao_ve_ham_Static_trong_JavaScript\" title=\"C\u00e2u 7: B\u1ea1n hi\u1ec3u nh\u01b0 th\u1ebf n\u00e0o v\u1ec1 h\u00e0m Static trong JavaScript?\">C\u00e2u 7: B\u1ea1n hi\u1ec3u nh\u01b0 th\u1ebf n\u00e0o v\u1ec1 h\u00e0m Static trong JavaScript?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/topviecit.vn\/blog\/phong-van-javascript\/#Cau_8_Ham_anonymous_la_gi_va_su_dung_khi_nao\" title=\"C\u00e2u 8: H\u00e0m anonymous l\u00e0 g\u00ec v\u00e0 s\u1eed d\u1ee5ng khi n\u00e0o?\">C\u00e2u 8: H\u00e0m anonymous l\u00e0 g\u00ec v\u00e0 s\u1eed d\u1ee5ng khi n\u00e0o?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/topviecit.vn\/blog\/phong-van-javascript\/#Cau_9_Phan_biet_su_khac_nhau_cua_Bind_Call_Apply_trong_JavaScript\" title=\"C\u00e2u 9: Ph\u00e2n bi\u1ec7t s\u1ef1 kh\u00e1c nhau c\u1ee7a Bind, Call, Apply trong JavaScript?\">C\u00e2u 9: Ph\u00e2n bi\u1ec7t s\u1ef1 kh\u00e1c nhau c\u1ee7a Bind, Call, Apply trong JavaScript?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/topviecit.vn\/blog\/phong-van-javascript\/#Cau_10_Khai_niem_Scope_cua_1_bien_trong_JavaScript_va_co_bao_nhieu_loai\" title=\"C\u00e2u 10: Kh\u00e1i ni\u1ec7m Scope c\u1ee7a 1 bi\u1ebfn trong JavaScript v\u00e0 c\u00f3 bao nhi\u00eau lo\u1ea1i?\">C\u00e2u 10: Kh\u00e1i ni\u1ec7m Scope c\u1ee7a 1 bi\u1ebfn trong JavaScript v\u00e0 c\u00f3 bao nhi\u00eau lo\u1ea1i?<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_1_Ban_hieu_gi_ve_lap_trinh_JavaScript\"><\/span><strong>C\u00e2u 1: B\u1ea1n hi\u1ec3u g\u00ec v\u1ec1 l\u1eadp tr\u00ecnh JavaScript?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u0110\u00e2y th\u01b0\u1eddng l\u00e0 c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n JavaScript \u0111\u1ea7u ti\u00ean \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. B\u1ea1n c\u00f3 th\u1ec3 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n JavaScript n\u00e0y nh\u01b0 sau:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>N\u1ebfu kh\u00e1i ni\u1ec7m c\u1ee7a JavaScript: L\u00e0 m\u1ed9t ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n b\u1edfi Brandan Eich, nh\u00e2n vi\u00ean c\u1ee7a Netscape n\u0103m 1995.<\/li>\n\n\n\n<li>Qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n v\u00e0 t\u1ef7 tr\u1ecdng s\u1eed d\u1ee5ng JavaScript t\u00ednh \u0111\u1ebfn th\u1eddi \u0111i\u1ec3m hi\u1ec7n t\u1ea1i.<\/li>\n\n\n\n<li>Nh\u1eefng \u01b0u &#8211; nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a JavaScript l\u00e0 g\u00ec?<\/li>\n<\/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\/11\/phong-van-javascript-topcv-1.jpg\" alt=\"H\u00e3y t\u00ecm hi\u1ec3u tr\u01b0\u1edbc v\u1ec1 kh\u00e1i ni\u1ec7m v\u00e0 nh\u1eefng v\u1ea5n \u0111\u1ec1 c\u01a1 b\u1ea3n c\u1ee7a JavaScript\" class=\"wp-image-3167\" srcset=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/11\/phong-van-javascript-topcv-1.jpg 800w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/11\/phong-van-javascript-topcv-1-640x400.jpg 640w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/11\/phong-van-javascript-topcv-1-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\"><em>H\u00e3y t\u00ecm hi\u1ec3u tr\u01b0\u1edbc v\u1ec1 kh\u00e1i ni\u1ec7m v\u00e0 nh\u1eefng v\u1ea5n \u0111\u1ec1 c\u01a1 b\u1ea3n c\u1ee7a JavaScript<\/em><\/figcaption><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_2_Hay_neu_ten_mot_so_du_lieu_co_ban_co_trong_JavaScript\"><\/span><strong>C\u00e2u 2: H\u00e3y n\u00eau t\u00ean m\u1ed9t s\u1ed1 d\u1eef li\u1ec7u c\u01a1 b\u1ea3n c\u00f3 trong JavaScript?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>C\u00f3 nhi\u1ec1u c\u00e1ch \u0111\u1ec3 tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n JavaScript n\u00e0y. Tuy v\u1eady, b\u1ea1n c\u00f3 th\u1ec3 chia th\u00e0nh 2 nh\u00f3m d\u1eef li\u1ec7u ch\u00ednh. Bao g\u1ed3m:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D\u1eef li\u1ec7u nguy\u00ean th\u1ee7y: Number, String, Boolean, Null, Symbol, Undefined.<\/li>\n\n\n\n<li>D\u1eef li\u1ec7u kh\u00f4ng nguy\u00ean th\u1ee7y hay c\u00f2n g\u1ecdi l\u00e0 d\u1eef li\u1ec7u tham chi\u1ebfu: G\u1ed3m Array, Object, RegExp.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_3_Ban_co_the_neu_su_khac_nhau_cua_Java_va_JavaScript_khong\"><\/span><strong>C\u00e2u 3: B\u1ea1n c\u00f3 th\u1ec3 n\u00eau s\u1ef1 kh\u00e1c nhau c\u1ee7a Java v\u00e0 JavaScript kh\u00f4ng?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Java v\u00e0 JavaScript \u0111\u1ec1u l\u00e0 nh\u1eefng ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh ph\u1ed5 bi\u1ebfn. V\u1edbi c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n JavaScript n\u00e0y, b\u1ea1n ch\u1ec9 c\u1ea7n n\u00eau nh\u1eefng s\u1ef1 kh\u00e1c bi\u1ec7t c\u01a1 b\u1ea3n c\u1ee7a 2 lo\u1ea1i ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh n\u00e0y. Bao g\u1ed3m:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Java: Ng\u00f4n ng\u1eef <strong><a href=\"https:\/\/topviecit.vn\/blog\/lap-trinh-huong-doi-tuong\/\" target=\"_blank\" rel=\"noreferrer noopener\">l\u1eadp tr\u00ecnh h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng<\/a><\/strong>, ho\u1ea1t \u0111\u1ed9ng \u1edf nhi\u1ec1u n\u1ec1n t\u1ea3ng kh\u00e1c nhau, d\u1ef1a v\u00e0o c\u00e1c l\u1edbp, l\u00e0 ng\u00f4n ng\u1eef \u0111\u1ed9c l\u1eadp.<\/li>\n\n\n\n<li>JavaScript: Ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh \u0111\u1ed9ng (ng\u00f4n ng\u1eef k\u1ecbch b\u1ea3n), s\u1eed d\u1ee5ng ch\u00ednh cho c\u00e1c website, \u1ee9ng d\u1ee5ng, c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng d\u1ef1a v\u00e0o HTML\/CSS.<\/li>\n<\/ul>\n\n\n\n<p><strong>T\u00ecm hi\u1ec3u th\u00eam: <\/strong><a href=\"https:\/\/topviecit.vn\/blog\/java-va-javascript-khac-nhau-the-nao\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Java v\u00e0 JavaScript kh\u00e1c nhau nh\u01b0 th\u1ebf n\u00e0o v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m m\u1ed7i lo\u1ea1i?<\/strong><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_4_Su_dung_%E2%80%9Cuse_strict%E2%80%9D_trong_JavaScript_co_nghia_la_gi\"><\/span><strong>C\u00e2u 4: S\u1eed d\u1ee5ng \u201cuse strict\u201d trong JavaScript c\u00f3 ngh\u0129a l\u00e0 g\u00ec?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Use Strict hay \u201cs\u1eed d\u1ee5ng s\u1ef1 nghi\u00eam ng\u1eb7t\u201d \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong JavaScript. Khi m\u1ed9t \u0111o\u1ea1n l\u1ec7nh \u0111\u01b0\u1ee3c khai b\u00e1o trong use strict, c\u00e1c d\u00f2ng code \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd 1 c\u00e1ch nghi\u00eam ng\u1eb7t h\u01a1n v\u1ec1 c\u00e1c kh\u00e1i ni\u1ec7m, c\u00fa ph\u00e1p.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_5_Hoisting_trong_JavaScript_se_duoc_xay_ra_nhu_the_nao\"><\/span><strong>C\u00e2u 5: Hoisting trong JavaScript s\u1ebd \u0111\u01b0\u1ee3c x\u1ea3y ra nh\u01b0 th\u1ebf n\u00e0o?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u0110\u00e2y c\u0169ng l\u00e0 m\u1ed9t trong nh\u1eefng c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n JavaScript th\u01b0\u1eddng g\u1eb7p. V\u1edbi c\u00e2u h\u1ecfi n\u00e0y, b\u1ea1n c\u00f3 th\u1ec3 n\u00eau kh\u00e1i ni\u1ec7m c\u1ee7a Hoisting nh\u01b0 sau: Hoisting l\u00e0 m\u1ed9t trong nh\u1eefng c\u01a1 ch\u1ebf \u0111\u01b0\u1ee3c m\u1eb7c \u0111\u1ecbnh c\u1ee7a JavaScript. M\u1ee5c \u0111\u00edch c\u1ee7a Hoisting l\u00e0 th\u1ef1c hi\u1ec7n di chuy\u1ec3n t\u1ea5t c\u1ea3 bi\u1ebfn, h\u00e0m khi \u0111\u01b0\u1ee3c khai b\u00e1o l\u00ean \u0111\u1ea7u ti\u00ean trong scope tr\u01b0\u1edbc khi \u0111\u01b0\u1ee3c th\u1ef1c thi. L\u01b0u \u00fd r\u1eb1ng, c\u01a1 ch\u1ebf n\u00e0y ch\u1ec9 di chuy\u1ec3n khai b\u00e1o v\u00e0 g\u00e1n gi\u00e1 tr\u1ecb \u0111\u01b0\u1ee3c gi\u1eef nguy\u00ean.<\/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\/11\/phong-van-javascript-2-topcv.jpg\" alt=\"Chu\u1ea9n b\u1ecb tr\u01b0\u1edbc c\u00e1c c\u00e2u h\u1ecfi s\u1ebd gi\u00fap b\u1ea1n t\u1ef1 tin h\u01a1n trong bu\u1ed5i ph\u1ecfng v\u1ea5n\" class=\"wp-image-3168\" srcset=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/11\/phong-van-javascript-2-topcv.jpg 800w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/11\/phong-van-javascript-2-topcv-640x400.jpg 640w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/11\/phong-van-javascript-2-topcv-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\"><em>Chu\u1ea9n b\u1ecb tr\u01b0\u1edbc c\u00e1c c\u00e2u h\u1ecfi s\u1ebd gi\u00fap b\u1ea1n t\u1ef1 tin h\u01a1n trong bu\u1ed5i ph\u1ecfng v\u1ea5n<\/em><\/figcaption><\/figure><\/div>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_6_Tinh_tuong_tac_bang_tham_chieu_trong_JavaScript_la_gi\"><\/span><strong>C\u00e2u 6: T\u00ednh t\u01b0\u01a1ng t\u00e1c b\u1eb1ng tham chi\u1ebfu trong JavaScript l\u00e0 g\u00ec?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Tham chi\u1ebfu c\u0169ng l\u00e0 m\u1ed9t trong nh\u1eefng c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n JavaScript \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. Trong l\u1eadp tr\u00ecnh JavaScript, tham chi\u1ebfu s\u1ebd c\u00f3 m\u1eb7t \u1edf m\u1ecdi n\u01a1i v\u00e0 gi\u1ed1ng nh\u01b0 bi\u1ebfn, nh\u01b0ng t\u01b0\u01a1ng t\u00e1c b\u1eb1ng tham chi\u1ebfu trong JavaScript s\u1ebd v\u00f4 h\u00ecnh. Trong nh\u1eefng ng\u00f4n ng\u1eef kh\u00e1c, tham chi\u1ebfu c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 pointer (C\/Go,&#8230;). Trong JavaScript, c\u00e1c object s\u1ebd t\u01b0\u01a1ng t\u00e1c b\u1eb1ng tham chi\u1ebfu v\u1edbi nhau khi thi\u1ebft l\u1eadp b\u1eb1ng nhau.<\/p>\n\n\n\n<p><strong>T\u00ecm hi\u1ec3u 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\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_7_Ban_hieu_nhu_the_nao_ve_ham_Static_trong_JavaScript\"><\/span><strong>C\u00e2u 7: B\u1ea1n hi\u1ec3u nh\u01b0 th\u1ebf n\u00e0o v\u1ec1 h\u00e0m Static trong JavaScript?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Trong JavaScript, Static l\u00e0 kh\u00e1i ni\u1ec7m \u0111\u1ec3 ch\u1ec9 t\u1eeb kh\u00f3a gi\u00fap b\u1ea1n khai b\u00e1o nh\u1eefng ph\u01b0\u01a1ng th\u1ee9c t\u0129nh, thu\u1ed9c t\u00ednh t\u0129nh trong c\u00e1c l\u1edbp c\u1ee7a JavaScript. Khi ph\u01b0\u01a1ng th\u1ee9c, thu\u1ed9c t\u00ednh \u0111\u01b0\u1ee3c khai b\u00e1o Static th\u00ec ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c g\u1ecdi \u0111\u1ebfn m\u00e0 l\u1eadp tr\u00ecnh vi\u00ean kh\u00f4ng ph\u1ea3i s\u1eed d\u1ee5ng t\u1eeb kh\u00f3a new kh\u1edfi t\u1ea1o \u0111\u1ed1i t\u01b0\u1ee3ng. B\u1ea1n kh\u00f4ng th\u1ec3 g\u1ecdi 1 ph\u01b0\u01a1ng th\u1ee9c static tr\u00ean m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_8_Ham_anonymous_la_gi_va_su_dung_khi_nao\"><\/span><strong>C\u00e2u 8: H\u00e0m anonymous l\u00e0 g\u00ec v\u00e0 s\u1eed d\u1ee5ng khi n\u00e0o?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>H\u00e0m anonymous l\u00e0 h\u00e0m kh\u00f4ng c\u00f3 t\u00ean, hay trong JavaScript n\u00f3 c\u0169ng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 h\u00e0m \u1ea9n danh. Anonymous \u0111\u01b0\u1ee3c sinh ra v\u00e0o \u0111\u00fang th\u1eddi \u0111i\u1ec3m ch\u1ea1y c\u1ee7a m\u00e0n h\u00ecnh. Th\u00f4ng th\u01b0\u1eddng, l\u1eadp tr\u00ecnh vi\u00ean khi khai b\u00e1o 1 h\u00e0m b\u1ea5t k\u1ef3, tr\u00ecnh bi\u00ean d\u1ecbch s\u1ebd l\u01b0u l\u1ea1i n\u00f3 trong b\u1ed9 nh\u1edb, l\u1eadp tr\u00ecnh vi\u00ean c\u00f3 th\u1ec3 g\u1ecdi \u1edf tr\u00ean\/d\u01b0\u1edbi v\u1ecb tr\u00ed khai b\u00e1o h\u00e0m. Tuy v\u1eady, \u0111\u1ed1i v\u1edbi h\u00e0m anonymous s\u1ebd \u0111\u01b0\u1ee3c sinh ra v\u00e0 s\u1eed d\u1ee5ng khi tr\u00ecnh bi\u00ean d\u1ecbch x\u1eed l\u00fd t\u1edbi n\u00f3.<\/p>\n\n\n\n<p><strong>T\u00ecm hi\u1ec3u th\u00eam: <a href=\"https:\/\/topviecit.vn\/blog\/cau-phong-van-ios-developer\/\" target=\"_blank\" rel=\"noreferrer noopener\">Top 8 c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n ios th\u00f4ng d\u1ee5ng nh\u1ea5t<\/a><\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_9_Phan_biet_su_khac_nhau_cua_Bind_Call_Apply_trong_JavaScript\"><\/span><strong>C\u00e2u 9: Ph\u00e2n bi\u1ec7t s\u1ef1 kh\u00e1c nhau c\u1ee7a Bind, Call, Apply trong JavaScript?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Bind, Call v\u00e0 Apply l\u00e0 nh\u1eefng prototype c\u1ee7a Function, do \u0111\u00f3, b\u1ea1n ch\u1ec9 c\u00f3 th\u1ec3 d\u00f9ng Function \u0111\u1ec3 g\u1ecdi 3 h\u00e0m n\u00e0y. Function c\u0169ng l\u00e0 m\u1ed9t lo\u1ea1i object v\u00e0 n\u00f3 s\u1ebd c\u00f3 prototype. V\u1ec1 c\u01a1 b\u1ea3n, c\u00e1c h\u00e0m call v\u00e0 apply s\u1ebd g\u1ea7n gi\u1ed1ng nhau, ch\u00fang l\u00e0 h\u00e0m tr\u1ef1c ti\u1ebfp. Ch\u00fang ch\u1ec9 kh\u00e1c nhau \u1edf h\u00e0m tham s\u1ed1. H\u00e0m Bind s\u1ebd h\u01a1i kh\u00e1c ch\u00fat l\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 h\u00e0m tr\u1ef1c ti\u1ebfp, n\u00f3 s\u1ebd tr\u1ea3 v\u1ec1 1 h\u00e0m m\u1edbi.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cau_10_Khai_niem_Scope_cua_1_bien_trong_JavaScript_va_co_bao_nhieu_loai\"><\/span><strong>C\u00e2u 10: Kh\u00e1i ni\u1ec7m Scope c\u1ee7a 1 bi\u1ebfn trong JavaScript v\u00e0 c\u00f3 bao nhi\u00eau lo\u1ea1i?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Scope c\u1ee7a 1 bi\u1ebfn \u0111\u01b0\u1ee3c hi\u1ec3u l\u00e0 ph\u1ea1m vi trong ch\u01b0\u01a1ng tr\u00ecnh m\u00e0 khi bi\u1ebfn \u0111\u00f3 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. Trong JavaScript s\u1ebd c\u00f3 3 lo\u1ea1i Scope ch\u00ednh bao g\u1ed3m:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Global Scope: Ph\u1ea1m vi ho\u1ea1t \u0111\u1ed9ng \u1edf b\u1ea5t k\u1ef3 m\u00e3 JavaScript n\u00e0o.<\/li>\n\n\n\n<li>Function Scope: Ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng trong function \u0111\u01b0\u1ee3c khai b\u00e1o bi\u1ebfn.<\/li>\n\n\n\n<li>Block Scope: C\u00f3 ph\u1ea1m vi trong d\u1ea5u {} khi l\u1eadp tr\u00ecnh vi\u00ean khai b\u00e1o bi\u1ebfn \u0111\u00f3.<\/li>\n<\/ul>\n\n\n\n<p><strong>C\u00f3 th\u1ec3 b\u1ea1n quan t\u00e2m: <a href=\"https:\/\/topviecit.vn\/blog\/sre-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">SRE L\u00e0 G\u00ec? Kh\u00e1c Bi\u1ec7t Gi\u1eefa SRE V\u00e0 DevOps<\/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\/11\/phong-van-javascript-topcv-3.jpg\" alt=\"H\u00e3y lu\u00f4n gi\u1eef th\u00e1i \u0111\u1ed9 t\u1ef1 tin khi ph\u1ecfng v\u1ea5n v\u1edbi nh\u00e0 tuy\u1ec3n d\u1ee5ng\" class=\"wp-image-3169\" srcset=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/11\/phong-van-javascript-topcv-3.jpg 800w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/11\/phong-van-javascript-topcv-3-640x400.jpg 640w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/11\/phong-van-javascript-topcv-3-768x480.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\"><em>H\u00e3y lu\u00f4n gi\u1eef th\u00e1i \u0111\u1ed9 t\u1ef1 tin khi ph\u1ecfng v\u1ea5n v\u1edbi nh\u00e0 tuy\u1ec3n d\u1ee5ng<\/em><\/figcaption><\/figure><\/div>\n\n\n<p>Hy v\u1ecdng v\u1edbi b\u00e0i vi\u1ebft <strong><a href=\"https:\/\/topviecit.vn\/blog\/chuyen-muc\/chia-se-kinh-nghiem\/\" target=\"_blank\" rel=\"noreferrer noopener\">chia s\u1ebb kinh nghi\u1ec7m<\/a><\/strong> c\u00f9ng v\u1edbi 10 c\u00e2u h\u1ecfi<strong> ph\u1ecfng v\u1ea5n JavaScript <\/strong>th\u01b0\u1eddng g\u1eb7p, b\u1ea1n s\u1ebd chu\u1ea9n b\u1ecb t\u1ed1t h\u01a1n cho bu\u1ed5i ph\u1ecfng v\u1ea5n s\u1eafp t\u1edbi. B\u00ean c\u1ea1nh \u0111\u00f3, h\u00e3y truy c\u1eadp v\u00e0o <a href=\"https:\/\/www.topcv.vn\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">TopCV<\/mark><\/strong><\/a> \u0111\u1ec3 ti\u1ebfp c\u1eadn v\u1edbi nh\u1eefng tin tuy\u1ec3n d\u1ee5ng h\u1ea5p d\u1eabn h\u01a1n n\u1ebfu b\u1ea1n c\u0169ng \u0111ang t\u00ecm ki\u1ebfm c\u00e1c c\u01a1 h\u1ed9i vi\u1ec7c l\u00e0m <strong><a href=\"https:\/\/www.topcv.vn\/tim-viec-lam-lap-trinh-vien-javascript\" target=\"_blank\" rel=\"noreferrer noopener\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">l\u1eadp tr\u00ecnh vi\u00ean Javascript<\/mark><\/a><\/strong> nh\u00e9. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>L\u1eadp tr\u00ecnh vi\u00ean JavaScript l\u00e0 m\u1ed9t v\u1ecb tr\u00ed quan tr\u1ecdng v\u00e0 \u0111\u01b0\u1ee3c tuy\u1ec3n d\u1ee5ng ph\u1ed5 bi\u1ebfn trong l\u0129nh v\u1ef1c IT. H\u00e3y c\u00f9ng tham kh\u1ea3o ngay 10 c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n JavaScript sau \u0111\u00e2y n\u1ebfu b\u1ea1n c\u00f3 bu\u1ed5i ph\u1ecfng v\u1ea5n s\u1eafp t\u1edbi c\u00f9ng TopviecIT nh\u00e9. C\u00e2u 1: B\u1ea1n hi\u1ec3u g\u00ec v\u1ec1 l\u1eadp tr\u00ecnh JavaScript? \u0110\u00e2y th\u01b0\u1eddng [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":3165,"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":[472,860,859,861,858,857,862],"class_list":["post-2860","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chia-se-kinh-nghiem","tag-cau-hoi-phong-van-javascript","tag-cau-hoi-phong-van-javascript-co-ban","tag-cau-hoi-phong-van-javascript-fresher","tag-javascript-phong-van","tag-phong-van-java","tag-phong-van-javascript","tag-phong-van-javascript-co-ban"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Top 10 c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n JavaScript cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u<\/title>\n<meta name=\"description\" content=\"H\u00e3y c\u00f9ng tham kh\u1ea3o ngay 10 c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n JavaScript sau \u0111\u00e2y n\u1ebfu b\u1ea1n c\u00f3 bu\u1ed5i ph\u1ecfng v\u1ea5n s\u1eafp t\u1edbi c\u00f9ng TopviecIT 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\/phong-van-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Top 10 c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n JavaScript cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u\" \/>\n<meta property=\"og:description\" content=\"H\u00e3y c\u00f9ng tham kh\u1ea3o 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