{"id":55454,"date":"2023-05-30T14:03:28","date_gmt":"2023-05-30T07:03:28","guid":{"rendered":"https:\/\/jobsgo.vn\/blog\/?p=55454"},"modified":"2023-12-20T09:31:39","modified_gmt":"2023-12-20T02:31:39","slug":"cac-cau-hoi-phong-van-nodejs","status":"publish","type":"post","link":"https:\/\/jobsgo.vn\/blog\/cac-cau-hoi-phong-van-nodejs\/","title":{"rendered":"T\u1ed5ng h\u1ee3p c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NodeJS th\u01b0\u1eddng g\u1eb7p nh\u1ea5t"},"content":{"rendered":"\n<div class=\"kk-star-ratings\n     kksr-valign-top     kksr-align-left    \"\n    data-payload=\"{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;55454&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;top&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;count&quot;:&quot;0&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;4.5&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;\\u0110\\u00e1nh gi\\u00e1 post&quot;,&quot;legend&quot;:&quot;4.5\\\/5 - (0 votes)&quot;,&quot;size&quot;:&quot;22&quot;,&quot;width&quot;:&quot;119&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;}\">\n    \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 119px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 22px; height: 22px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n    \n<div class=\"kksr-legend\">\n            <span class=\"kksr-muted\">\u0110\u00e1nh gi\u00e1 post<\/span>\n    <\/div>\n<\/div>\n<p><em>NodeJS l\u00e0 m\u1ed9t platform si\u00eau ph\u1ed5 bi\u1ebfn \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng tr\u00ean n\u1ec1n JavaScript \u0111\u1ec3 ch\u1ea1y c\u00e1c \u1ee9ng d\u1ee5ng m\u1ea1ng ph\u00eda server. Nh\u1edd v\u1eady m\u00e0 th\u1ecb tr\u01b0\u1eddng tuy\u1ec3n d\u1ee5ng NodeJS t\u1ea1i Vi\u1ec7t Nam nh\u1eefng n\u0103m g\u1ea7n \u0111\u00e2y lu\u00f4n \u1edf m\u1ee9c \u201cs\u1ed1t n\u00f3ng\u201d. B\u00e0i vi\u1ebft h\u00f4m nay, JobsGO s\u1ebd c\u00f9ng b\u1ea1n t\u00ecm hi\u1ec3u <\/em><a href=\"https:\/\/jobsgo.vn\/blog\/cac-cau-hoi-phong-van-nodejs\/#c\u00e1c_c\u00e2u_h\u1ecfi_ph\u1ecfng_v\u1ea5n_nodejs\" target=\"_blank\" rel=\"noopener\"><strong><em>c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NodeJS<\/em><\/strong><\/a><em> th\u01b0\u1eddng g\u1eb7p v\u00e0 c\u00e1ch tr\u1ea3 l\u1eddi \u0111\u00fang \u0111\u1ec3 b\u1ea1n chinh ph\u1ee5c Nh\u00e0 tuy\u1ec3n d\u1ee5ng. \u0110\u1ecdc ngay nh\u00e9!<\/em><\/p>\n<div id=\"toc_container\" class=\"toc_light_blue no_bullets\"><p class=\"toc_title\">M\u1ee5c l\u1ee5c<\/p><ul class=\"toc_list\"><li><a href=\"#1_Cac_cau_hoi_phong_van_NodeJS_pho_bien\">1. C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NodeJS ph\u1ed5 bi\u1ebfn<\/a><ul><li><a href=\"#Cau_1_NodeJS_la_gi\">C\u00e2u 1. NodeJS l\u00e0 g\u00ec?<\/a><\/li><li><a href=\"#Cau_2_Neu_cac_kieu_du_lieu_trong_NodeJS\">C\u00e2u 2. N\u00eau \u200b\u200bc\u00e1c ki\u1ec3u d\u1eef li\u1ec7u trong NodeJS<\/a><\/li><li><a href=\"#Cau_3_Cac_tinh_nang_chinh_cua_NodeJS_la_gi\">C\u00e2u 3. C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a NodeJS l\u00e0 g\u00ec?<\/a><\/li><li><a href=\"#Cau_4_NodeJS_don_luong_hay_da_luong\">C\u00e2u 4. NodeJS \u0111\u01a1n lu\u1ed3ng hay \u0111a lu\u1ed3ng?<\/a><\/li><li><a href=\"#Cau_5_Nhung_ung_dung_nen_viet_bang_NodeJS\">C\u00e2u 5. Nh\u1eefng \u1ee9ng d\u1ee5ng n\u00ean vi\u1ebft b\u1eb1ng NodeJS?<\/a><\/li><li><a href=\"#Cau_6_Hay_giai_thich_ve_mo_hinh_IO_Non-blocking_trong_NodeJS\">C\u00e2u 6. H\u00e3y gi\u1ea3i th\u00edch v\u1ec1 m\u00f4 h\u00ecnh I\/O Non-blocking trong NodeJS<\/a><\/li><li><a href=\"#Cau_7_RESTful_Web_Service_trong_NodeJS_la_gi\">C\u00e2u 7. RESTful Web Service trong NodeJS l\u00e0 g\u00ec?<\/a><\/li><li><a href=\"#Cau_8_REPL_Terminal_trong_NodeJS_la_gi\">C\u00e2u 8. REPL Terminal trong NodeJS l\u00e0 g\u00ec?<\/a><\/li><li><a href=\"#Cau_9_EventEmitter_trong_NodeJS_la_gi\">C\u00e2u 9. EventEmitter trong NodeJS l\u00e0 g\u00ec?<\/a><\/li><li><a href=\"#Cau_10_Uu_Nhuoc_diem_cua_NodeJS_la_gi\">C\u00e2u 10. \u01afu \u2013 Nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a NodeJS l\u00e0 g\u00ec?<\/a><\/li><li><a href=\"#Cau_11_Gioi_thieu_mot_so_framework_cua_Nodejs\">C\u00e2u 11. Gi\u1edbi thi\u1ec7u m\u1ed9t s\u1ed1 framework c\u1ee7a Nodejs<\/a><\/li><li><a href=\"#Cau_12_Tai_sao_nen_su_dung_ExpressJS\">C\u00e2u 12. T\u1ea1i sao n\u00ean s\u1eed d\u1ee5ng ExpressJS?<\/a><\/li><li><a href=\"#Cau_13_Stream_trong_NodeJS_la_gi\">C\u00e2u 13. Stream trong NodeJS l\u00e0 g\u00ec?<\/a><\/li><li><a href=\"#Cau_14_Su_khac_nhau_giua_Event_va_Callbacks_trong_NodeJS_la_gi\">C\u00e2u 14. S\u1ef1 kh\u00e1c nhau gi\u1eefa \u200b\u200bEvent v\u00e0 Callbacks trong NodeJS l\u00e0 g\u00ec?<\/a><\/li><li><a href=\"#Cau_15_Vong_lap_su_kien_trong_NodeJS_la_gi\">C\u00e2u 15. V\u00f2ng l\u1eb7p s\u1ef1 ki\u1ec7n trong NodeJS l\u00e0 g\u00ec?<\/a><\/li><\/ul><\/li><li><a href=\"#2_Luu_y_khi_tra_loi_phong_van_NodeJS\">2. L\u01b0u \u00fd khi tr\u1ea3 l\u1eddi ph\u1ecfng v\u1ea5n NodeJS<\/a><\/li><\/ul><\/div>\n<h2><span id=\"1_Cac_cau_hoi_phong_van_NodeJS_pho_bien\"><strong>1. C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NodeJS ph\u1ed5 bi\u1ebfn<\/strong><\/span><\/h2>\n<p>T\u1ed5ng h\u1ee3p <strong>c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NodeJS<\/strong> t\u1eeb ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n \u0111\u1ebfn n\u00e2ng cao:<\/p>\n<figure id=\"attachment_55455\" aria-describedby=\"caption-attachment-55455\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" class=\"size-full wp-image-55455\" src=\"https:\/\/media-blog.jobsgo.vn\/blog\/wp-content\/uploads\/2023\/05\/cac-cau-hoi-phong-van-nodejs.jpg\" alt=\"c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n nodejs\" width=\"800\" height=\"450\" srcset=\"https:\/\/media-blog.jobsgo.vn\/blog\/wp-content\/uploads\/2023\/05\/cac-cau-hoi-phong-van-nodejs.jpg 800w, https:\/\/media-blog.jobsgo.vn\/blog\/wp-content\/uploads\/2023\/05\/cac-cau-hoi-phong-van-nodejs-300x169.jpg 300w, https:\/\/media-blog.jobsgo.vn\/blog\/wp-content\/uploads\/2023\/05\/cac-cau-hoi-phong-van-nodejs-150x84.jpg 150w, https:\/\/media-blog.jobsgo.vn\/blog\/wp-content\/uploads\/2023\/05\/cac-cau-hoi-phong-van-nodejs-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-55455\" class=\"wp-caption-text\"><center><em>C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NodeJS ph\u1ed5 bi\u1ebfn<\/em><\/center><\/figcaption><\/figure>\n<h3><span id=\"Cau_1_NodeJS_la_gi\"><strong>C\u00e2u 1. NodeJS l\u00e0 g\u00ec?<\/strong><\/span><\/h3>\n<blockquote id=\"b\u1ed9_c\u00e2u_h\u1ecfi_ph\u1ecfng_v\u1ea5n_nodejs\" cite=\"https:\/\/jobsgo.vn\/blog\/cac-cau-hoi-phong-van-nodejs\/#cau_hoi_nodejs_thuong_gap\"><p><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Node.js\"><strong>NodeJS<\/strong><\/a> l\u00e0 m\u00e3 ngu\u1ed3n m\u1edf \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng tr\u00ean JavaScript V8 runtime, \u0111\u01b0\u1ee3c vi\u1ebft b\u1eb1ng C++ v\u00e0 JavaScript \u0111\u1ec3 t\u1ea1o ra c\u00e1c ch\u01b0\u01a1ng tr\u00ecnh m\u1ea1ng, \u1ee9ng d\u1ee5ng web,&#8230;<\/p><\/blockquote>\n<p>N\u1ec1n t\u1ea3ng n\u00e0y \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n v\u00e0o n\u0103m 2009, c\u00f3 th\u1ec3 ch\u1ea1y tr\u00ean nhi\u1ec1u h\u1ec7 \u0111i\u1ec1u h\u00e0nh kh\u00e1c nhau.<\/p>\n<h3><span id=\"Cau_2_Neu_cac_kieu_du_lieu_trong_NodeJS\"><strong>C\u00e2u 2. N\u00eau \u200b\u200bc\u00e1c ki\u1ec3u d\u1eef li\u1ec7u trong NodeJS<\/strong><\/span><\/h3>\n<p>T\u01b0\u01a1ng t\u1ef1 JavaScript, NodeJS c\u00f3 nh\u1eefng ki\u1ec3u d\u1eef li\u1ec7u c\u01a1 b\u1ea3n nh\u01b0 sau:<\/p>\n<ul>\n<li aria-level=\"1\">D\u1eef li\u1ec7u nguy\u00ean th\u1ee7y: Number, String, Undefined, Bigint, Boolean, NullZ, Symbol.<\/li>\n<li aria-level=\"1\">D\u1eef li\u1ec7u tham chi\u1ebfu: Function, Array, Buffer.<\/li>\n<\/ul>\n<h3><span id=\"Cau_3_Cac_tinh_nang_chinh_cua_NodeJS_la_gi\"><strong>C\u00e2u 3. C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a NodeJS l\u00e0 g\u00ec?<\/strong><\/span><\/h3>\n<p>M\u1ed9t v\u00e0i t\u00ednh n\u0103ng n\u1ed5i b\u1eadt ph\u1ea3i \u0111\u1ec1 c\u1eadp khi b\u1ea1n tr\u1ea3 l\u1eddi <strong>c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NodeJS<\/strong>:<\/p>\n<ul>\n<li aria-level=\"1\">T\u00ednh n\u0103ng l\u1eadp tr\u00ecnh h\u01b0\u1edbng s\u1ef1 ki\u1ec7n v\u00e0 kh\u00f4ng \u0111\u1ed3ng b\u1ed9 gi\u00fap NodeJS th\u1ef1c hi\u1ec7n y\u00eau c\u1ea7u m\u1edbi \u1edf ch\u1ebf \u0111\u1ed9 n\u1ec1n v\u00e0 ti\u1ebfp t\u1ee5c x\u1eed l\u00fd c\u00e1c y\u00eau c\u1ea7u tr\u01b0\u1edbc \u0111\u00f3.<\/li>\n<li aria-level=\"1\">NodeJS s\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 V8 JavaScript Runtime n\u00ean c\u00f3 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng cao, ph\u1ea3n h\u1ed3i s\u1ef1 ki\u1ec7n nhanh.<\/li>\n<li aria-level=\"1\">Kh\u00f4ng c\u00f3 buffer m\u00e0 c\u00e1c d\u1eef li\u1ec7u s\u1ebd \u0111\u01b0\u1ee3c xu\u1ea5t theo kh\u1ed1i.<\/li>\n<li aria-level=\"1\">NodeJS \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u00e0 ph\u00e1t h\u00e0nh c\u00f3 c\u1ea5p ph\u00e9p MIT.<\/li>\n<\/ul>\n<h3><span id=\"Cau_4_NodeJS_don_luong_hay_da_luong\"><strong>C\u00e2u 4. NodeJS \u0111\u01a1n lu\u1ed3ng hay \u0111a lu\u1ed3ng?<\/strong><\/span><\/h3>\n<p>\u0110\u00e2y l\u00e0 m\u1ed9t trong <strong>c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NodeJS<\/strong> r\u1ea5t hay g\u1eb7p, c\u00e1c <a rel=\"nofollow\" href=\"https:\/\/employer.jobsgo.vn\/\"><strong>Nh\u00e0 tuy\u1ec3n d\u1ee5ng<\/strong><\/a> l\u1ef1a ch\u1ecdn c\u00e2u h\u1ecfi n\u00e0y \u0111\u1ec3 ki\u1ec3m tra ki\u1ebfn th\u1ee9c c\u1ee7a \u1ee9ng vi\u00ean v\u1ec1 c\u00e1ch v\u1eadn h\u00e0nh NodeJS.<\/p>\n<p>NodeJS ban \u0111\u1ea7u \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng d\u1ef1a tr\u00ean \u00fd t\u01b0\u1edfng \u0111\u01a1n lu\u1ed3ng v\u00e0 ch\u1ec9 x\u1eed l\u00fd nhi\u1ec1u ho\u1ea1t \u0111\u1ed9ng th\u00f4ng qua c\u00e1c quy tr\u00ecnh kh\u00f4ng \u0111\u1ed3ng b\u1ed9. B\u1eaft \u0111\u1ea7u t\u1eeb version 13, NodeJS \u0111\u01b0\u1ee3c b\u1ed5 sung th\u00eam module h\u1ed7 tr\u1ee3 x\u1eed l\u00fd \u0111a lu\u1ed3ng.<\/p>\n<h3><span id=\"Cau_5_Nhung_ung_dung_nen_viet_bang_NodeJS\"><strong>C\u00e2u 5. Nh\u1eefng \u1ee9ng d\u1ee5ng n\u00ean vi\u1ebft b\u1eb1ng NodeJS?<\/strong><\/span><\/h3>\n<p>NodeJS \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e2y d\u1ef1ng nhi\u1ec1u \u1ee9ng d\u1ee5ng kh\u00e1c nhau, ph\u1ed5 bi\u1ebfn nh\u1ea5t c\u00f3 th\u1ec3 k\u1ec3 \u0111\u1ebfn:<\/p>\n<ul>\n<li aria-level=\"1\">Real-time Chats.<\/li>\n<li aria-level=\"1\">Internet of Things.<\/li>\n<li aria-level=\"1\">Complex SPAs (Single-Page Applications).<\/li>\n<li aria-level=\"1\">Real-time Collaboration tools.<\/li>\n<li aria-level=\"1\">Streaming Applications.<\/li>\n<li aria-level=\"1\">Microservices Architecture.<\/li>\n<\/ul>\n<h3><span id=\"Cau_6_Hay_giai_thich_ve_mo_hinh_IO_Non-blocking_trong_NodeJS\"><strong>C\u00e2u 6. H\u00e3y gi\u1ea3i th\u00edch v\u1ec1 m\u00f4 h\u00ecnh I\/O Non-blocking trong NodeJS<\/strong><\/span><\/h3>\n<p>N\u1ebfu Blocking l\u00e0 kh\u00e1i ni\u1ec7m \u0111\u1ec3 ch\u1ec9 h\u00e0nh \u0111\u1ed9ng ng\u0103n ch\u1eb7n c\u00e1c t\u00e1c v\u1ee5 ti\u1ebfp theo \u0111\u01b0\u1ee3c th\u1ef1c thi khi t\u00e1c v\u1ee5 hi\u1ec7n t\u1ea1i ch\u01b0a k\u1ebft th\u00fac th\u00ec Non-blocking s\u1ebd kh\u00f4ng ch\u1eb7n. Non-blocking IO trong NodeJS s\u1ebd gi\u00fap c\u00e1c <a href=\"https:\/\/jobsgo.vn\/blog\/lap-trinh-vien\/\" target=\"_blank\" rel=\"noopener\"><strong>L\u1eadp tr\u00ecnh vi\u00ean<\/strong><\/a> kh\u00f4ng c\u1ea7n x\u1eed l\u00fd \u0111a lu\u1ed3ng m\u00e0 v\u1eabn c\u00f3 th\u1ec3 ti\u1ebfp nh\u1eadn v\u00e0 th\u1ef1c hi\u1ec7n \u0111\u01b0\u1ee3c nhi\u1ec1u request c\u00f9ng m\u1ed9t l\u00fac.<\/p>\n<h3><span id=\"Cau_7_RESTful_Web_Service_trong_NodeJS_la_gi\"><strong>C\u00e2u 7. RESTful Web Service trong NodeJS l\u00e0 g\u00ec?<\/strong><\/span><\/h3>\n<p>RESTful Web Service trong NodeJS l\u00e0 m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c giao th\u1ee9c trao \u0111\u1ed5i h\u1ec7 th\u1ed1ng v\u00e0 \u1ee9ng d\u1ee5ng. Ngh\u0129a l\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u01b0\u1ee3c t\u1ea1o ra b\u1edfi c\u00e1c ng\u00f4n ng\u1eef v\u00e0 n\u1ec1n t\u1ea3ng kh\u00e1c nhau c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng RESTful Web Service \u0111\u1ec3 trao \u0111\u1ed5i d\u1eef li\u1ec7u.<\/p>\n<h3><span id=\"Cau_8_REPL_Terminal_trong_NodeJS_la_gi\"><strong>C\u00e2u 8. REPL Terminal trong NodeJS l\u00e0 g\u00ec?<\/strong><\/span><\/h3>\n<p>REPL l\u00e0 t\u1eeb vi\u1ebft t\u1eaft c\u1ee7a Read, Eval, Print v\u00e0 Loop. \u0110\u00e2y l\u00e0 m\u00f4i tr\u01b0\u1eddng m\u00e1y t\u00ednh cho ph\u00e9p ng\u01b0\u1eddi d\u00f9ng vi\u1ebft code v\u00e0 ch\u1ea1y tr\u1ef1c ti\u1ebfp tr\u00ean m\u00e0n h\u00ecnh shell\/console\/terminal \u0111\u1ec3 debug, ki\u1ec3m tra code m\u00e0 kh\u00f4ng c\u1ea7n t\u1ea1o ra b\u1ea5t c\u1ee9 m\u1ed9t file hay folder n\u00e0o.<\/p>\n<h3><span id=\"Cau_9_EventEmitter_trong_NodeJS_la_gi\"><strong>C\u00e2u 9. EventEmitter trong NodeJS l\u00e0 g\u00ec?<\/strong><\/span><\/h3>\n<p><strong>C\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NodeJS<\/strong> c\u0169ng \u0111\u01b0\u1ee3c Nh\u00e0 tuy\u1ec3n d\u1ee5ng \u0111\u00e0o s\u00e2u v\u1ec1 EventEmitter.<\/p>\n<p>EventEmitter l\u00e0 m\u1ed9t l\u1edbp \u0111\u1ed1i t\u01b0\u1ee3ng trong NodeJS, c\u00f3 ch\u1ee9c n\u0103ng ch\u00ednh l\u00e0 ph\u00e1t sinh s\u1ef1 ki\u1ec7n th\u00f4ng qua Module Event. Khi EventEmitter ph\u00e1t ra m\u1ed9t s\u1ef1 ki\u1ec7n, t\u1ea5t c\u1ea3 c\u00e1c h\u00e0m g\u1eafn v\u1edbi s\u1ef1 ki\u1ec7n \u0111\u00f3 \u0111\u01b0\u1ee3c g\u1ecdi m\u1ed9t c\u00e1ch \u0111\u1ed3ng b\u1ed9.<\/p>\n<h3><span id=\"Cau_10_Uu_Nhuoc_diem_cua_NodeJS_la_gi\"><strong>C\u00e2u 10. \u01afu \u2013 Nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a NodeJS l\u00e0 g\u00ec?<\/strong><\/span><\/h3>\n<p>\u0110\u00e2y l\u00e0 m\u1ed9t trong <strong>c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NodeJS<\/strong> c\u01a1 b\u1ea3n, JobsGO c\u00f3 g\u1ee3i \u00fd c\u00e2u tr\u1ea3 l\u1eddi nh\u01b0 sau:<\/p>\n<table style=\"width: 777px;\">\n<tbody>\n<tr>\n<td style=\"text-align: center; width: 377.375px;\"><strong>\u01afu \u0111i\u1ec3m c\u1ee7a NodeJS<\/strong><\/td>\n<td style=\"text-align: center; width: 389.625px;\"><strong>Nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a NodeJS<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 377.375px;\">\n<ul>\n<li aria-level=\"1\">X\u1eed l\u00fd nhanh h\u00e0ng ng\u00e0n truy c\u1eadp c\u00f9ng l\u00fac m\u00e0 kh\u00f4ng g\u1eb7p kh\u00f3 kh\u0103n.<\/li>\n<li aria-level=\"1\">S\u1eed d\u1ee5ng ng\u00f4n ng\u1eef JavaScript ph\u1ed5 bi\u1ebfn.<\/li>\n<li aria-level=\"1\">T\u01b0\u01a1ng th\u00edch tr\u00ean nhi\u1ec1u thi\u1ebft b\u1ecb, h\u1ec7 \u0111i\u1ec1u h\u00e0nh.<\/li>\n<li aria-level=\"1\">\u0110\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c c\u00e1c y\u00eau c\u1ea7u th\u1eddi gian th\u1ef1c.<\/li>\n<\/ul>\n<\/td>\n<td style=\"width: 389.625px;\">\n<ul>\n<li aria-level=\"1\">Kh\u00f4ng th\u00edch h\u1ee3p v\u1edbi c\u00e1c server \u0111\u00f2i h\u1ecfi vi\u1ec7c t\u00ednh to\u00e1n n\u1eb7ng.<\/li>\n<li aria-level=\"1\">S\u1eed d\u1ee5ng c\u1ea5u tr\u00fac Callbacks ph\u1ee9c t\u1ea1p.<\/li>\n<li aria-level=\"1\">Kh\u1ea3 n\u0103ng x\u1eed l\u00fd c\u01a1 s\u1edf d\u1eef li\u1ec7u quan h\u1ec7 r\u1ea5t kh\u00f3 kh\u0103n.<\/li>\n<li aria-level=\"1\">Kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c t\u00e1c v\u1ee5 c\u1ea7n s\u1eed d\u1ee5ng nhi\u1ec1u CPU.<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><em>B\u1ea3ng 1. \u01afu \u2013 Nh\u01b0\u1ee3c \u0111i\u1ec3m khi s\u1eed d\u1ee5ng NodeJS.<\/em><\/p>\n<h3><span id=\"Cau_11_Gioi_thieu_mot_so_framework_cua_Nodejs\"><strong>C\u00e2u 11. Gi\u1edbi thi\u1ec7u m\u1ed9t s\u1ed1 framework c\u1ee7a Nodejs<\/strong><\/span><\/h3>\n<p>V\u1edbi nh\u1eefng \u01b0u \u0111i\u1ec3m c\u1ee7a m\u00ecnh, c\u00f3 kh\u00f4ng \u00edt c\u00e1c framework n\u1ed5i ti\u1ebfng \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ea1o ra nh\u1edd NodeJS. C\u1ee5 th\u1ec3:<\/p>\n<ul>\n<li aria-level=\"1\">ExpressJS: X\u00e2y d\u1ef1ng m\u1ed9t lo\u1ea1t c\u00e1c \u1ee9ng d\u1ee5ng web v\u00e0 di \u0111\u1ed9ng.<\/li>\n<li aria-level=\"1\">KoaJS: S\u1eed d\u1ee5ng Middleware theo t\u1eebng t\u1ea7ng v\u00e0 ki\u1ec3m so\u00e1t l\u1ed7i t\u1ed1t h\u01a1n ExpressJS.<\/li>\n<li aria-level=\"1\">SailsJS: S\u1eed d\u1ee5ng m\u00f4 h\u00ecnh MVC l\u00e0m ki\u1ebfn tr\u00fac gi\u00fap \u0111\u01a1n gi\u1ea3n h\u00f3a vi\u1ec7c x\u00e2y d\u1ef1ng \u1ee9ng d\u1ee5ng.<\/li>\n<li aria-level=\"1\">Meteor: Cho ph\u00e9p x\u00e2y d\u1ef1ng c\u00e1c \u1ee9ng d\u1ee5ng k\u1ebft h\u1ee3p NodeJS v\u1edbi m\u1ed9t front-end framework nh\u01b0 Angular, React,\u2026<\/li>\n<\/ul>\n<h3><span id=\"Cau_12_Tai_sao_nen_su_dung_ExpressJS\"><strong>C\u00e2u 12. T\u1ea1i sao n\u00ean s\u1eed d\u1ee5ng ExpressJS?<\/strong><\/span><\/h3>\n<p>\u201c<em>T\u1ea1i sao n\u00ean s\u1eed d\u1ee5ng ExpressJS?<\/em>\u201d l\u00e0 m\u1ed9t trong <strong>c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NodeJS<\/strong> th\u01b0\u1eddng \u0111\u01b0\u1ee3c Nh\u00e0 tuy\u1ec3n d\u1ee5ng \u0111\u1ec1 c\u1eadp \u0111\u1ebfn.<\/p>\n<p>ExpressJS th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o ra c\u00e1c \u1ee9ng d\u1ee5ng web ti\u1ec7n \u00edch, d\u1ec5 s\u1eed d\u1ee5ng v\u00e0 th\u00f4ng minh. M\u1eb7t kh\u00e1c, ExpressJS c\u00f3 dung l\u01b0\u1ee3ng nh\u1eb9 n\u00ean c\u00e1c thao t\u00e1c th\u1ef1c hi\u1ec7n c\u0169ng tr\u1edf n\u00ean \u0111\u01a1n gi\u1ea3n h\u01a1n. \u0110\u00f3 l\u00e0 nguy\u00ean do v\u00ec sao b\u1ea1n n\u00ean s\u1eed d\u1ee5ng ExpressJS trong l\u1eadp tr\u00ecnh.<\/p>\n<h3><span id=\"Cau_13_Stream_trong_NodeJS_la_gi\"><strong>C\u00e2u 13. Stream trong NodeJS l\u00e0 g\u00ec?<\/strong><\/span><\/h3>\n<p>Stream l\u00e0 m\u1ed9t collections c\u1ee7a d\u1eef li\u1ec7u. N\u00f3 cho ph\u00e9p b\u1ea1n \u0111\u1ecdc d\u1eef li\u1ec7u t\u1eeb m\u1ed9t ngu\u1ed3n v\u00e0 ghi d\u1eef li\u1ec7u \u0111\u1ebfn m\u1ed9t \u0111\u00edch.<\/p>\n<p>Trong NodeJS, Steam c\u00f3 4 lo\u1ea1i l\u00e0:<\/p>\n<ul>\n<li aria-level=\"1\">Readable: D\u00f9ng khi \u0111\u1ecdc d\u1eef li\u1ec7u.<\/li>\n<li aria-level=\"1\">Writable: D\u00f9ng khi ghi d\u1eef li\u1ec7u.<\/li>\n<li aria-level=\"1\">Duplex: D\u00f9ng khi \u0111\u1ecdc v\u00e0 ghi.<\/li>\n<li aria-level=\"1\">Transform: T\u00ednh to\u00e1n k\u1ebft qu\u1ea3 \u0111\u1ea7u ra d\u1ef1a tr\u00ean d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o.<\/li>\n<\/ul>\n<h3><span id=\"Cau_14_Su_khac_nhau_giua_Event_va_Callbacks_trong_NodeJS_la_gi\"><strong>C\u00e2u 14. S\u1ef1 kh\u00e1c nhau gi\u1eefa \u200b\u200bEvent v\u00e0 Callbacks trong NodeJS l\u00e0 g\u00ec?<\/strong><\/span><\/h3>\n<p>Khi t\u00ecm hi\u1ec3u v\u1ec1 NodeJS, h\u1eb3n hai kh\u00e1i ni\u1ec7m Event v\u00e0 Callbacks kh\u00f4ng c\u00f2n qu\u00e1 \u201cl\u1ea1 l\u1eabm\u201d \u0111\u1ed1i v\u1edbi b\u1ea1n. Nh\u01b0ng li\u1ec7u b\u1ea1n hi\u1ec3u \u0111i\u1ec3m kh\u00e1c bi\u1ec7t c\u1ee7a hai kh\u00e1i ni\u1ec7m n\u00e0y l\u00e0 g\u00ec?<\/p>\n<table style=\"width: 777px;\">\n<tbody>\n<tr>\n<td style=\"text-align: center; width: 379.297px;\"><strong>Event<\/strong><\/td>\n<td style=\"text-align: center; width: 387.703px;\"><strong>Callbacks<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"width: 379.297px;\">NodeJS s\u1eed d\u1ee5ng l\u1eadp tr\u00ecnh h\u01b0\u1edbng Event.<\/p>\n<p>Khi ch\u1ea1y ch\u01b0\u01a1ng tr\u00ecnh NodeJS, c\u00e1c bi\u1ebfn \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o, khai b\u00e1o c\u00e1c Function v\u00e0 sau \u0111\u00f3 c\u00e1c Event \u0111\u01b0\u1ee3c t\u1ea1o ra.<\/td>\n<td style=\"width: 387.703px;\">Callbacks l\u00e0 h\u00e0m g\u1ecdi l\u1ea1i. \u0110\u00e2y l\u00e0 h\u00e0m \u0111\u01b0\u1ee3c truy\u1ec1n v\u00e0o h\u00e0m kh\u00e1c d\u01b0\u1edbi d\u1ea1ng \u0111\u1ed1i s\u1ed1.<\/p>\n<p>Th\u00f4ng th\u01b0\u1eddng, Callbacks \u0111\u01b0\u1ee3c g\u1ecdi khi m\u1ed9t Function ti\u1ebfn h\u00e0nh th\u1ef1c thi v\u00e0 tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><em>B\u1ea3ng 2. S\u1ef1 kh\u00e1c nhau gi\u1eefa \u200b\u200bEvent v\u00e0 Callbacks trong NodeJS.<\/em><\/p>\n<p>Nh\u01b0 v\u1eady, \u0111i\u1ec3m kh\u00e1c bi\u1ec7t l\u1edbn nh\u1ea5t c\u1ee7a Event v\u00e0 Callbacks n\u1eb1m \u1edf ch\u1ed7: Callbacks ch\u1ec9 \u0111\u01b0\u1ee3c th\u1ef1c thi khi m\u1ed9t h\u00e0m kh\u00e1c \u0111\u00e3 \u0111\u01b0\u1ee3c th\u1ef1c thi xong, trong khi m\u1ed9t Event l\u1ea1i \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t ngay sau khi th\u1ef1c hi\u1ec7n ti\u1ebfn h\u00e0nh m\u00e1y ch\u1ee7.<\/p>\n<h3><span id=\"Cau_15_Vong_lap_su_kien_trong_NodeJS_la_gi\"><strong>C\u00e2u 15. V\u00f2ng l\u1eb7p s\u1ef1 ki\u1ec7n trong NodeJS l\u00e0 g\u00ec?<\/strong><\/span><\/h3>\n<p>V\u00f2ng l\u1eb7p s\u1ef1 ki\u1ec7n Event Loop l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m quan tr\u1ecdng b\u1ea1n c\u1ea7n n\u1eafm \u0111\u01b0\u1ee3c khi t\u00ecm hi\u1ec3u v\u1ec1 <strong>c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NodeJS<\/strong>.<\/p>\n<p>Event Loop l\u00e0 m\u1ed9t v\u00f2ng l\u1eb7p v\u00f4 t\u1eadn, ki\u1ec3m tra li\u00ean t\u1ee5c Event v\u00e0 Callbacks khi b\u1ea1n ch\u1ea1y m\u1ed9t ch\u01b0\u01a1ng tr\u00ecnh NodeJS. N\u00f3 c\u0169ng tham gia \u0111i\u1ec1u khi\u1ec3n c\u00e1c t\u00e1c v\u1ee5 kh\u00e1c nh\u01b0: \u0111\u1ecdc v\u00e0 ghi t\u1eeb c\u00e1c I\/O, g\u1eedi v\u00e0 nh\u1eadn d\u1eef li\u1ec7u t\u1eeb m\u1ea1ng,&#8230;<\/p>\n<h2><span id=\"2_Luu_y_khi_tra_loi_phong_van_NodeJS\"><strong>2. L\u01b0u \u00fd khi tr\u1ea3 l\u1eddi ph\u1ecfng v\u1ea5n NodeJS<\/strong><\/span><\/h2>\n<figure id=\"attachment_55456\" aria-describedby=\"caption-attachment-55456\" style=\"width: 800px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" class=\"size-full wp-image-55456\" src=\"https:\/\/media-blog.jobsgo.vn\/blog\/wp-content\/uploads\/2023\/05\/nhung-cau-hoi-phong-van-nodejs-thuong-gap.jpg\" alt=\"nh\u1eefng c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n nodejs th\u01b0\u1eddng g\u1eb7p\" width=\"800\" height=\"531\" srcset=\"https:\/\/media-blog.jobsgo.vn\/blog\/wp-content\/uploads\/2023\/05\/nhung-cau-hoi-phong-van-nodejs-thuong-gap.jpg 800w, https:\/\/media-blog.jobsgo.vn\/blog\/wp-content\/uploads\/2023\/05\/nhung-cau-hoi-phong-van-nodejs-thuong-gap-300x199.jpg 300w, https:\/\/media-blog.jobsgo.vn\/blog\/wp-content\/uploads\/2023\/05\/nhung-cau-hoi-phong-van-nodejs-thuong-gap-150x100.jpg 150w, https:\/\/media-blog.jobsgo.vn\/blog\/wp-content\/uploads\/2023\/05\/nhung-cau-hoi-phong-van-nodejs-thuong-gap-768x510.jpg 768w, https:\/\/media-blog.jobsgo.vn\/blog\/wp-content\/uploads\/2023\/05\/nhung-cau-hoi-phong-van-nodejs-thuong-gap-120x80.jpg 120w, https:\/\/media-blog.jobsgo.vn\/blog\/wp-content\/uploads\/2023\/05\/nhung-cau-hoi-phong-van-nodejs-thuong-gap-360x240.jpg 360w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption id=\"caption-attachment-55456\" class=\"wp-caption-text\"><center><em>L\u01b0u \u00fd khi tr\u1ea3 l\u1eddi ph\u1ecfng v\u1ea5n NodeJS<\/em><\/center><\/figcaption><\/figure>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 kinh nghi\u1ec7m tr\u1ea3 l\u1eddi <strong>c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NodeJS<\/strong> t\u1eeb chuy\u00ean gia gi\u00fap b\u1ea1n v\u01b0\u1ee3t qua bu\u1ed5i \u0111\u00e1nh gi\u00e1 d\u1ec5 d\u00e0ng:<\/p>\n<ul>\n<li aria-level=\"1\">T\u00ecm hi\u1ec3u v\u1ec1 c\u00f4ng ty tr\u01b0\u1edbc khi \u0111\u1ebfn <a href=\"https:\/\/jobsgo.vn\/blog\/phong-van-xin-viec\/\" target=\"_blank\" rel=\"noopener\"><strong>ph\u1ecfng v\u1ea5n xin vi\u1ec7c<\/strong><\/a>.<\/li>\n<li aria-level=\"1\">Chu\u1ea9n b\u1ecb ki\u1ebfn th\u1ee9c ph\u00f9 h\u1ee3p v\u1edbi m\u00f4 t\u1ea3 c\u00f4ng vi\u1ec7c.<\/li>\n<li aria-level=\"1\">L\u00ean c\u00e1c k\u1ecbch b\u1ea3n tr\u1ea3 l\u1eddi cho c\u00e2u h\u1ecfi t\u00ecnh hu\u1ed1ng.<\/li>\n<li aria-level=\"1\">Tr\u1ea3 l\u1eddi c\u00e1c c\u00e2u h\u1ecfi m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng, r\u00e0nh m\u1ea1ch.<\/li>\n<li aria-level=\"1\">Gi\u1eef th\u00e1i \u0111\u1ed9 chuy\u00ean nghi\u1ec7p v\u00e0 th\u1ea7n th\u00e1i t\u1ef1 tin.<\/li>\n<li aria-level=\"1\">Ch\u1ee7 \u0111\u1ed9ng \u0111\u1eb7t c\u00e2u h\u1ecfi cho Nh\u00e0 tuy\u1ec3n d\u1ee5ng.<\/li>\n<\/ul>\n<p>Tr\u00ean \u0111\u00e2y l\u00e0 <strong>c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NodeJS<\/strong> th\u01b0\u1eddng g\u1eb7p v\u00e0 nh\u1eefng l\u01b0u \u00fd khi tr\u1ea3 l\u1eddi. \u0110\u1ec3 t\u00ecm vi\u1ec7c l\u00e0m l\u1eadp tr\u00ecnh vi\u00ean NodeJS v\u1edbi m\u1ee9c l\u01b0\u01a1ng h\u1ea5p d\u1eabn, b\u1ea1n h\u00e3y truy c\u1eadp ngay v\u00e0o trang tin tuy\u1ec3n d\u1ee5ng uy t\u00edn <a rel=\"nofollow\" href=\"http:\/\/jobsgo.vn\"><strong>JobsGO.vn<\/strong><\/a> \u0111\u1ec3 ch\u00fang t\u00f4i h\u1ed7 tr\u1ee3 b\u1ea1n \u1ee9ng tuy\u1ec3n nhanh ch\u00f3ng!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0110\u00e1nh gi\u00e1 post NodeJS l\u00e0 m\u1ed9t platform si\u00eau ph\u1ed5 bi\u1ebfn \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng tr\u00ean n\u1ec1n JavaScript \u0111\u1ec3 ch\u1ea1y c\u00e1c \u1ee9ng d\u1ee5ng m\u1ea1ng ph\u00eda server. Nh\u1edd v\u1eady m\u00e0 th\u1ecb tr\u01b0\u1eddng tuy\u1ec3n d\u1ee5ng NodeJS t\u1ea1i Vi\u1ec7t Nam nh\u1eefng n\u0103m g\u1ea7n \u0111\u00e2y lu\u00f4n&#8230;<\/p>\n","protected":false},"author":43,"featured_media":55455,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n nodejs","_yoast_wpseo_title":"Tuy\u1ec3n t\u1eadp c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NodeJS th\u01b0\u1eddng g\u1eb7p & g\u1ee3i \u00fd tr\u1ea3 l\u1eddi %%sep%% %%sitename%%","_yoast_wpseo_metadesc":"B\u00e0i vi\u1ebft n\u00e0y JobsGO \u0111\u00e3 t\u1ed5ng h\u1ee3p c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NodeJS th\u01b0\u1eddng g\u1eb7p k\u00e8m g\u1ee3i \u00fd tr\u1ea3 l\u1eddi cho c\u00e1c b\u1ea1n \u0111\u1ec3 c\u00f3 bu\u1ed5i ph\u1ecfng v\u1ea5n t\u1ed1t nh\u1ea5t.","_yoast_wpseo_focus_keyphrase":"","faq":"","nganh_nghe_chuc_vu_lien_quan":["L\u1eadp Tr\u00ecnh Nodejs"]},"categories":[7,1059,3028],"tags":[],"yoast_head":"\n<title>Tuy\u1ec3n t\u1eadp c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n NodeJS th\u01b0\u1eddng g\u1eb7p &amp; g\u1ee3i \u00fd tr\u1ea3 l\u1eddi - 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