{"id":1837,"date":"2022-05-10T04:08:46","date_gmt":"2022-05-10T04:08:46","guid":{"rendered":"https:\/\/topviecit.vn\/blog\/?p=1837"},"modified":"2022-05-10T04:08:47","modified_gmt":"2022-05-10T04:08:47","slug":"callback-function-la-gi","status":"publish","type":"post","link":"https:\/\/topviecit.vn\/blog\/callback-function-la-gi\/","title":{"rendered":"Callback function l\u00e0 g\u00ec? T\u00ecm hi\u1ec3u v\u1ec1 h\u00e0m Callback trong javascript"},"content":{"rendered":"\n<p>Khi b\u01b0\u1edbc ch\u00e2n v\u00e0o l\u0129nh v\u1ef1c c\u00f4ng ngh\u1ec7 th\u00f4ng tin s\u1ebd c\u00f3 r\u1ea5t nhi\u1ec1u thu\u1eadt ng\u1eef m\u00e0 b\u1ea1n ph\u1ea3i l\u00e0m quen, hi\u1ec3u v\u00e0 s\u1eed d\u1ee5ng n\u00f3. Trong \u0111\u00f3, Callback function l\u00e0 m\u1ed9t trong nh\u1eefng \u0111\u1ecbnh ngh\u0129a kh\u00f3 m\u00e0 kh\u00f4ng ph\u1ea3i ai c\u0169ng bi\u1ebft, nh\u1ea5t l\u00e0 nh\u1eefng ng\u01b0\u1eddi m\u1edbi v\u00e0o ngh\u1ec1. Trong b\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y, <strong><a href=\"https:\/\/topviecit.vn\/\">topviecit.vn<\/a><\/strong> s\u1ebd gi\u1edbi thi\u1ec7u t\u1edbi b\u1ea1n <strong>Callback Function l\u00e0 g\u00ec?<\/strong> v\u00e0 nh\u1eefng th\u00f4ng tin c\u01a1 b\u1ea3n v\u1ec1 Callback function.\u00a0<\/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\/callback-function-la-gi\/#Callback_function_la_gi\" title=\"Callback function l\u00e0 g\u00ec?\">Callback function 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:\/\/topviecit.vn\/blog\/callback-function-la-gi\/#Tai_sao_can_su_dung_Callback_function\" title=\"T\u1ea1i sao c\u1ea7n s\u1eed d\u1ee5ng Callback function?\">T\u1ea1i sao c\u1ea7n s\u1eed d\u1ee5ng Callback function?<\/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\/callback-function-la-gi\/#Cach_phan_loai_Callback_function\" title=\"C\u00e1ch ph\u00e2n lo\u1ea1i Callback function\">C\u00e1ch ph\u00e2n lo\u1ea1i Callback function<\/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\/callback-function-la-gi\/#Nguyen_tac_khi_thuc_hien_Callback_function\" title=\"Nguy\u00ean t\u1eafc khi th\u1ef1c hi\u1ec7n Callback function\">Nguy\u00ean t\u1eafc khi th\u1ef1c hi\u1ec7n Callback function<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Callback_function_la_gi\"><\/span>Callback function l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><strong>Callback Function l\u00e0 g\u00ec?<\/strong> Callback Function l\u00e0 m\u1ed9t \u0111o\u1ea1n code \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 tham s\u1ed1 truy\u1ec1n v\u00e0o c\u1ee7a m\u1ed9t h\u00e0m B n\u00e0o \u0111\u00f3. Sau khi h\u00e0m B \u0111\u01b0\u1ee3c g\u1ecdi, th\u00ec h\u00e0m A c\u0169ng \u0111\u01b0\u1ee3c g\u1ecdi ngay l\u1eadp t\u1ee9c ho\u1eb7c ch\u1eadm 1 ch\u00fat. Ho\u1eb7c hi\u1ec3u \u0111\u01a1n gi\u1ea3n h\u01a1n, h\u00e0m callback ch\u00ednh l\u00e0 m\u1ed9t h\u00e0m \u0111\u01b0\u1ee3c g\u1ecdi khi m\u1ed9t \u0111i\u1ec1u g\u00ec \u0111\u00f3 x\u1ea3y ra, th\u01b0\u1eddng l\u00e0 event, theo ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh.&nbsp;<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image.png\" alt=\"Callback Function l\u00e0 g\u00ec?\" class=\"wp-image-1850\" title=\"Callback Function l\u00e0 g\u00ec?\" srcset=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image.png 800w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-640x400.png 640w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-768x480.png 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption><em>Callback Function l\u00e0 g\u00ec?<\/em><\/figcaption><\/figure><\/div>\n\n\n\n<p>H\u00e0m callback \u0111\u01b0\u1ee3c xu\u1ea5t hi\u1ec7n t\u1eeb l\u1eadp tr\u00ecnh h\u00e0m v\u00e0 c\u1ee5 th\u1ec3 h\u00f3a c\u00e1ch d\u00f9ng c\u1ee7a c\u00e1c h\u00e0m nh\u01b0 argument. Trong JavaScript, m\u1ed7i h\u00e0m s\u1ebd l\u00e0 m\u1ed9t first-class object (\u0111\u1ed1i t\u01b0\u1ee3ng h\u1ea1ng nh\u1ea5t). Hay n\u00f3i c\u00e1ch kh\u00e1c, m\u1ed7i h\u00e0m l\u00e0 m\u1ed9t object v\u00e0 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nh\u01b0 nh\u1eefng object kh\u00e1c (string, number\u2026). Nh\u1edd v\u1eady, ch\u00fang ta c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng h\u00e0m n\u00e0y nh\u01b0 tham s\u1ed1 cho m\u1ed9t h\u00e0m kh\u00e1c. \u0110\u00e2y \u0111\u01b0\u1ee3c xem l\u00e0 \u00fd t\u01b0\u1edfng c\u1ed1t l\u00f5i c\u1ee7a Callback function.\u00a0<\/p>\n\n\n\n<p>>>>Xem th\u00eam: <a href=\"https:\/\/topviecit.vn\/blog\/arrow-function-la-gi\/\">Arrow Function l\u00e0 g\u00ec? Ph\u00e2n bi\u1ec7t Arrow Function v\u00e0 Function\u00a0<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tai_sao_can_su_dung_Callback_function\"><\/span>T\u1ea1i sao c\u1ea7n s\u1eed d\u1ee5ng Callback function?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Ph\u1ea7n l\u1edbn th\u1eddi gian, ch\u00fang ta t\u1ea1o ra ch\u01b0\u01a1ng tr\u00ecnh v\u00e0 ph\u1ea7n m\u1ec1m theo h\u01b0\u1edbng x\u1eed l\u00fd \u0111\u1ed3ng b\u1ed9. C\u00f3 ngh\u0129a l\u00e0 b\u01b0\u1edbc 2 ch\u1ec9 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n, khi b\u01b0\u1edbc 1 ho\u00e0n th\u00e0nh, hay khi n\u00e0o ho\u00e0n th\u00e0nh 1 ch\u01b0\u01a1ng tr\u00ecnh xong th\u00ec ch\u01b0\u01a1ng tr\u00ecnh kh\u00e1c m\u1edbi \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n. Th\u00f4ng th\u01b0\u1eddng, khi ch\u00fang ta y\u00eau c\u1ea7u d\u1eef li\u1ec7u t\u1eeb m\u1ed9t ngu\u1ed3n trung gian nh\u01b0 API m\u1edf, ch\u00fang ta s\u1ebd kh\u00f3 m\u00e0 bi\u1ebft \u0111\u01b0\u1ee3c th\u1eddi gian ch\u00ednh x\u00e1c d\u1eef li\u1ec7u s\u1ebd \u0111\u01b0\u1ee3c tr\u1ea3 v\u1ec1.&nbsp;<\/p>\n\n\n\n<p>Ch\u00fang ta mu\u1ed1n ch\u1edd d\u1eef li\u1ec7u xu\u1ea5t hi\u1ec7n, nh\u01b0ng l\u1ea1i kh\u00f4ng mu\u1ed1n c\u1ea3 ch\u01b0\u01a1ng tr\u00ecnh ph\u1ea3i d\u1eebng l\u1ea1i khi t\u00ecm ki\u1ebfm d\u1eef li\u1ec7u. \u0110\u00e2y ch\u00ednh l\u00e0 l\u00fac callback ph\u00e1t huy t\u00e1c d\u1ee5ng, ngo\u00e0i ra, h\u00e0m c\u00f3 cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng t\u00e1i s\u1eed d\u1ee5ng code.<\/p>\n\n\n\n<p>\u0110\u1eb7c bi\u1ec7t, trong JavaScript, h\u00e0m callback c\u00f2n c\u00f3 \u00fd ngh\u0129a r\u1ea5t quan tr\u1ecdng. B\u1edfi \u0111\u00e2y l\u00e0 ng\u00f4n ng\u1eef h\u01b0\u1edbng \u0111\u1ebfn s\u1ef1 ki\u1ec7n. Kh\u00f4ng gi\u1ed1ng nh\u01b0 c\u00e1c ng\u00f4n ng\u1eef kh\u00e1c, thay v\u00ec \u0111\u1ee3i ph\u1ea3n h\u1ed3i r\u1ed3i m\u1edbi ti\u1ebfp t\u1ee5c, JavaScript s\u1ebd th\u1ef1c thi.&nbsp;<\/p>\n\n\n\n<p>Callback function gi\u00fap ng\u01b0\u1eddi d\u00f9ng \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u1ed9t code s\u1ebd v\u1eabn \u0111\u01b0\u1ee3c th\u1ef1c thi khi code kh\u00e1c \u0111ang ti\u1ebfp di\u1ec5n m\u00e0 kh\u00f4ng ph\u1ea3i ch\u1edd \u0111\u1ee3i. \u0110\u00e2y l\u00e0 l\u00fd do m\u00e0 nhi\u1ec1u l\u1eadp tr\u00ecnh vi\u00ean th\u01b0\u1eddng c\u00f3 th\u00f3i quen s\u1eed d\u1ee5ng h\u00e0m n\u00e0y khi x\u00e2y d\u1ef1ng ng\u00f4n ng\u1eef l\u1eadp tr\u00ecnh.&nbsp;<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-1.png\" alt=\"T\u1ea1i sao c\u1ea7n s\u1eed d\u1ee5ng h\u00e0m callback?\" class=\"wp-image-1851\" title=\"T\u1ea1i sao c\u1ea7n s\u1eed d\u1ee5ng h\u00e0m callback?\" srcset=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-1.png 800w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-1-640x400.png 640w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-1-768x480.png 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption><em>T\u1ea1i sao c\u1ea7n s\u1eed d\u1ee5ng h\u00e0m callback?<\/em><\/figcaption><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Cach_phan_loai_Callback_function\"><\/span>C\u00e1ch ph\u00e2n lo\u1ea1i Callback function<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>D\u1ef1a tr\u00ean c\u00e1ch ch\u00fang \u0111\u01b0\u1ee3c g\u1ecdi, Callback Function \u0111\u01b0\u1ee3c chia th\u00e0nh 2 nh\u00f3m ch\u00ednh l\u00e0: synchronous (x\u1eed l\u00fd \u0111\u1ed3ng b\u1ed9) v\u00e0 asynchronous (x\u1eed l\u00fd kh\u00f4ng \u0111\u1ed3ng b\u1ed9).&nbsp;<\/p>\n\n\n\n<p>Th\u1ee9 nh\u1ea5t, Synchronous callback function hay c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 blocking callback function. L\u00fd gi\u1ea3i cho thu\u1eadt ng\u1eef n\u00e0y v\u00ec Higher-Order Function (h\u00e0m b\u1eadc cao) s\u1ebd kh\u00f4ng c\u00f3 kh\u1ea3 n\u0103ng ho\u00e0n th\u00e0nh n\u1ebfu nh\u01b0 1 h\u00e0m callback ch\u01b0a ch\u1ea1y xong.&nbsp;<\/p>\n\n\n\n<p>Th\u1ee9 hai, Asynchronous callback hay c\u00f3 c\u00e1ch g\u1ecdi kh\u00e1c l\u00e0 non-blocking callback. H\u00e0m b\u1eadc cao c\u00f3 kh\u1ea3 n\u0103ng ho\u00e0n th\u00e0nh th\u1ef1c thi m\u1ed9t c\u00e1ch \u0111\u1ed9c l\u1eadp m\u00e0 kh\u00f4ng c\u1ea7n \u0111\u1ee3i callback function. H\u00e0m b\u1eadc cao n\u00e0y \u0111\u1ea3m b\u1ea3o t\u1ea1o \u0111i\u1ec1u ki\u1ec7n cho callback function \u0111\u01b0\u1ee3c th\u1ef1c thi trong m\u1ed9t s\u1ef1 ki\u1ec7n sau \u0111\u00f3.<\/p>\n\n\n\n<p>>>>Xem th\u00eam: <a href=\"https:\/\/topviecit.vn\/blog\/bitbucket-la-gi\/\">Bitbucket l\u00e0 g\u00ec? T\u00ecm hi\u1ec3u t\u00ednh n\u0103ng c\u1ee7a Bitbucket<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Nguyen_tac_khi_thuc_hien_Callback_function\"><\/span>Nguy\u00ean t\u1eafc khi th\u1ef1c hi\u1ec7n Callback function<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>B\u00ean c\u1ea1nh th\u1eafc m\u1eafc <strong>Callback function l\u00e0 g\u00ec?<\/strong> Nguy\u00ean t\u1eafc th\u1ef1c hi\u1ec7n h\u00e0m n\u00e0y c\u0169ng g\u00e2y ra kh\u00f4ng \u00edt kh\u00f3 kh\u0103n cho nh\u1eefng ng\u01b0\u1eddi l\u00e0m l\u1eadp tr\u00ecnh khi l\u1ea7n \u0111\u1ea7u ti\u1ebfp x\u00fac v\u1edbi kh\u00e1i ni\u1ec7m n\u00e0y. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 nguy\u00ean t\u1eafc ch\u00ednh khi th\u1ef1c hi\u1ec7n Callback function:&nbsp;<\/p>\n\n\n\n<p><strong>&nbsp;Tham s\u1ed1 truy\u1ec1n v\u00e0o ph\u1ea3i l\u00e0 m\u1ed9t function<\/strong><\/p>\n\n\n\n<p>\u0110\u00e2y ch\u00ednh l\u00e0 nguy\u00ean t\u1eafc \u0111\u1ea7u ti\u00ean, quan tr\u1ecdng nh\u1ea5t b\u1edfi n\u1ebfu b\u1ea1n kh\u00f4ng ki\u1ec3m tra gi\u00e1 tr\u1ecb m\u00e0 ng\u01b0\u1eddi d\u00f9ng truy\u1ec1n v\u00e0o l\u00e0 m\u1ed9t function th\u00ec b\u1ea1n kh\u00f4ng th\u1ec3 th\u1ef1c thi \u0111\u01b0\u1ee3c. \u0110i\u1ec3m n\u00e0y c\u0169ng l\u00e0 m\u1ed9t trong nh\u1eefng ti\u00eau ch\u00ed x\u00e1c \u0111\u1ecbnh \u0111\u00e2u l\u00e0 m\u1ed9t l\u1eadp tr\u00ecnh nhi\u1ec1u kinh nghi\u1ec7m v\u00e0 l\u1eadp tr\u00ecnh vi\u00ean m\u1edbi v\u00e0o ngh\u1ec1.&nbsp;<\/p>\n\n\n\n<p><strong>C\u1ea9n th\u1eadn v\u1edbi this&nbsp;<\/strong><\/p>\n\n\n\n<p>N\u1ebfu h\u00e0m \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng trong Object, th\u00ec b\u1ea1n c\u1ea7n c\u1ea9n th\u1eadn v\u1edbi this v\u00ec c\u00f3 th\u1ec3 g\u00e2y ra nh\u1eefng hi\u1ec3u l\u1ea7m kh\u00f4ng \u0111\u00e1ng c\u00f3.&nbsp;<\/p>\n\n\n\n<p>Theo nguy\u00ean t\u1eafc, callback l\u00e0 m\u1ed9t h\u00e0m \u0111\u01a1n ph\u01b0\u01a1ng n\u00ean khi b\u1ea1n s\u1eed d\u1ee5ng t\u1eeb kh\u00f3a this trong h\u00e0m th\u00ec n\u00f3 s\u1ebd hi\u1ec3u this l\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng Window Object. L\u00fac n\u00e0y, cho d\u00f9 b\u1ea1n \u0111\u1ecbnh ngh\u0129a h\u00e0m callback n\u1eb1m trong m\u1ed9t object th\u00ec kh\u00f4ng th\u1ec3 truy c\u1eadp \u0111\u1ebfn d\u1eef li\u1ec7u c\u1ee7a object th\u00f4ng qua t\u1eeb kh\u00f3a this.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-2.png\" alt=\"C\u00e1c nguy\u00ean t\u1eafc ch\u00ednh khi s\u1eed d\u1ee5ng callback function\" class=\"wp-image-1852\" srcset=\"https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-2.png 800w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-2-640x400.png 640w, https:\/\/topviecit.vn\/blog\/wp-content\/uploads\/2022\/05\/image-2-768x480.png 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption><em>C\u00e1c nguy\u00ean t\u1eafc ch\u00ednh khi s\u1eed d\u1ee5ng callback function<\/em><\/figcaption><\/figure><\/div>\n\n\n\n<p><strong>Kh\u1eafc ph\u1ee5c this khi callback n\u1eb1m trong object<\/strong><\/p>\n\n\n\n<p>\u1ede ph\u1ea7n tr\u00ean, ch\u00fang t\u00f4i \u0111\u00e3 \u0111\u01b0a ra l\u01b0u \u00fd khi s\u1eed d\u1ee5ng this trong h\u00e0m callback th\u00ec this s\u1ebd h\u01b0\u1edbng t\u1edbi \u0111\u1ed1i t\u01b0\u1ee3ng window ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 h\u00e0m callback.&nbsp;<\/p>\n\n\n\n<p><strong>Callback Hell<\/strong><\/p>\n\n\n\n<p>Ch\u00fang ta \u0111\u1ec1u bi\u1ebft, h\u00e0m callback \u0111\u01b0\u1ee3c th\u1ef1c thi b\u00ean trong 1 h\u00e0m kh\u00e1c, s\u1ef1 x\u1ebfp ch\u1ed3ng c\u00e1c h\u00e0m callback l\u00ean nhau \u0111\u01b0\u1ee3c g\u1ecdi callback hell. Khi callback hell xu\u1ea5t hi\u1ec7n, vi\u1ec7c x\u1eed l\u00fd ch\u01b0\u01a1ng tr\u00ecnh s\u1ebd r\u1ea5t ph\u1ee9c t\u1ea1p, \u0111\u00f2i h\u1ecfi l\u1eadp tr\u00ecnh vi\u00ean ph\u1ea3i l\u00e0 ng\u01b0\u1eddi c\u00f3 d\u00e0y d\u1ea1n kinh nghi\u1ec7m.&nbsp;<\/p>\n\n\n\n<p>Kh\u00f4ng ch\u1ec9 c\u00f3 v\u1eady, callback hell c\u0169ng l\u00e0m cho t\u00ednh th\u1ea9m m\u0129 c\u1ee7a code gi\u1ea3m \u0111i \u0111\u00e1ng k\u1ec3, kh\u00f3 \u0111\u1ecdc, kh\u00f3 maintain.<\/p>\n\n\n\n<p>Tr\u00ean \u0111\u00e2y l\u00e0 nh\u1eefng th\u00f4ng tin v\u1ec1 <strong>Callback function l\u00e0 g\u00ec<\/strong> v\u00e0 m\u1ed9t s\u1ed1 ki\u1ebfn th\u1ee9c v\u1ec1 thu\u1eadt ng\u1eef n\u00e0y c\u0169ng nh\u01b0 c\u00e1ch s\u1eed d\u1ee5ng ch\u00fang. Hy v\u1ecdng \u0111\u00e3 gi\u00fap cho b\u1ea1n hi\u1ec3u v\u00e0 c\u00f3 th\u00eam c\u00e1ch x\u1eed l\u00fd c\u00e1c t\u00ecnh hu\u1ed1ng ph\u00e1t sinh khi l\u00e0m vi\u1ec7c v\u1edbi h\u00e0m n\u00e0y. Callback Function n\u00f3i ri\u00eang v\u00e0 c\u00e1c thu\u1eadt ng\u1eef li\u00ean quan \u0111\u1ebfn IT n\u00f3i chung \u0111\u1ec1u l\u00e0 nh\u1eefng thu\u1eadt ng\u1eef r\u1ea5t kh\u00f3, b\u1edfi v\u1eady, b\u1ea1n ph\u1ea3i th\u1eadt s\u1ef1 \u0111am m\u00ea v\u1edbi ng\u00e0nh n\u00e0y th\u00ec m\u1edbi c\u00f3 th\u1ec3 v\u01b0\u1ee3t qua nh\u1eefng kh\u00f3 kh\u0103n v\u00e0 v\u1eefng b\u01b0\u1edbc v\u1edbi ngh\u1ec1.\u00a0<\/p>\n\n\n\n<p>>>>Xem th\u00eam: <a href=\"https:\/\/topviecit.vn\/blog\/json-la-gi\/\">Json L\u00e0 G\u00ec? Nh\u1eefng \u0110i\u1ec1u D\u00e2n L\u1eadp Tr\u00ecnh C\u1ea7n Bi\u1ebft V\u1ec1 JSON<\/a><\/p>\n\n\n\n<p class=\"has-text-align-right\"><em>H\u00ecnh \u1ea3nh: S\u01b0u t\u1ea7m<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Khi b\u01b0\u1edbc ch\u00e2n v\u00e0o l\u0129nh v\u1ef1c c\u00f4ng ngh\u1ec7 th\u00f4ng tin s\u1ebd c\u00f3 r\u1ea5t nhi\u1ec1u thu\u1eadt ng\u1eef m\u00e0 b\u1ea1n ph\u1ea3i l\u00e0m quen, hi\u1ec3u v\u00e0 s\u1eed d\u1ee5ng n\u00f3. Trong \u0111\u00f3, Callback function l\u00e0 m\u1ed9t trong nh\u1eefng \u0111\u1ecbnh ngh\u0129a kh\u00f3 m\u00e0 kh\u00f4ng ph\u1ea3i ai c\u0169ng bi\u1ebft, nh\u1ea5t l\u00e0 nh\u1eefng ng\u01b0\u1eddi m\u1edbi v\u00e0o ngh\u1ec1. Trong b\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y, [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":1842,"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":[436],"class_list":["post-1837","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-chia-se-kinh-nghiem","tag-callback-function-la-gi"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Callback function l\u00e0 g\u00ec? T\u00ecm hi\u1ec3u v\u1ec1 h\u00e0m Callback trong javascript<\/title>\n<meta name=\"description\" content=\"Callback Function l\u00e0 g\u00ec? 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