window.alert()<\/code> \u0111\u1ec3 hi\u1ec3n th\u1ecb d\u1eef li\u1ec7u.<\/p>\n\n\n\nV\u00ed d\u1ee5:<\/p>\n\n\n\n
<!DOCTYPE html>\n<html>\n<body><h1>Trang web \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i<\/h1>\n<p>\u0110o\u1ea1n \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i.<\/p><script>\nwindow.alert(8 + 7);\n<\/script>\n<\/body>\n<\/html><\/code><\/pre>\n\n\n\n
\n\n\n\n<\/span>S\u1eed d\u1ee5ng document.write()<\/span><\/h2>\n\n\n\nCho m\u1ee5c \u0111\u00edch ki\u1ec3m tra, th\u1eadt ti\u1ec7n l\u1ee3i \u0111\u1ec3 s\u1eed d\u1ee5ng h\u00e0m document.write()<\/code>.<\/p>\n\n\n\nV\u00ed d\u1ee5:<\/p>\n\n\n\n
<!DOCTYPE html>\n<html>\n<body><h1>Trang web \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i<\/h1>\n<p>V\u0103n b\u1ea3n \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i.<\/p><script>\ndocument.write(8 + 7);\n<\/script>\n<\/body>\n<\/html><\/code><\/pre>\n\n\n\nKhi b\u1ea1n s\u1eed d\u1ee5ng\u00a0document.write()<\/code>\u00a0sau khi t\u00e0i li\u1ec7u HTML \u0111\u01b0\u1ee3c t\u1ea3i xong ho\u00e0n to\u00e0n, n\u00f3 s\u1ebd xo\u00e1 t\u1ea5t c\u1ea3 t\u00e0i li\u1ec7u HTML \u0111\u00e3 t\u1ed3n t\u1ea1i tr\u01b0\u1edbc \u0111\u00f3.<\/p>\n\n\n\nV\u00ed d\u1ee5:<\/p>\n\n\n\n
<!DOCTYPE html>\n<html>\n<body><h1>Trang web \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i<\/h1>\n<p>V\u0103n b\u1ea3n \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i.<\/p><button onclick=\"document.write(7 + 8)\">Click v\u00e0o \u0111\u00e2y<\/button>\n<\/body>\n<\/html><\/code><\/pre>\n\n\n\nPh\u01b0\u01a1ng th\u1ee9c document.write()<\/code> ch\u1ec9 n\u00ean d\u00f9ng cho m\u1ee5c \u0111\u00edch ki\u1ec3m tra.<\/p>\n\n\n\n
\n\n\n\n<\/span>S\u1eed d\u1ee5ng innerHTML<\/span><\/h2>\n\n\n\n\u0110\u1ec3 \u201ctruy c\u1eadp\u201d v\u00e0o m\u1ed9t ph\u1ea7n t\u1eed HTML, JavaScript c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng ph\u01b0\u01a1ng th\u1ee9c document.getElementById(id)<\/code><\/p>\n\n\n\nThu\u1ed9c t\u00ednh id<\/code> <\/strong>\u0111\u1ecbnh ngh\u0129a m\u1ed9t ph\u1ea7n t\u1eed HTML. Thu\u1ed9c t\u00ednh innerHTML<\/code> \u0111\u1ecbnh ngh\u0129a n\u1ed9i dung c\u1ee7a HTML:<\/p>\n\n\n\nV\u00ed d\u1ee5<\/h3>\n\n\n\n<!DOCTYPE html>\n<html>\n<body><h1>Trang web \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i<\/h1>\n<p>V\u0103n b\u1ea3n \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i<\/p><p id=\"demo\"><\/p><script>\ndocument.getElementById(\"demo\").innerHTML = 7 + 8;\n<\/script>\n<\/body>\n<\/html><\/code><\/pre>\n\n\n\n\u0110\u1ec3 \u201chi\u1ec3n th\u1ecb d\u1eef li\u1ec7u\u201d trong HTML (trong h\u1ea7u h\u1ebft tr\u01b0\u1eddng h\u1ee3p), b\u1ea1n s\u1ebd thi\u1ebft l\u1eadp gi\u00e1 tr\u1ecb cho thu\u1ed9c t\u00ednh innerHTML<\/code>.<\/p>\n\n\n\n
\n\n\n\n<\/span>S\u1eed d\u1ee5ng console.log()<\/span><\/h2>\n\n\n\nTrong tr\u00ecnh duy\u1ec7t c\u1ee7a b\u1ea1n, b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng ph\u01b0\u01a1ng th\u1ee9c consolo.log()<\/code> \u0111\u1ec3 hi\u1ec3n th\u1ecb d\u1eef li\u1ec7u.<\/p>\n\n\n\nK\u00edch ho\u1ea1t t\u00ednh n\u0103ng consolo c\u1ee7a tr\u00ecnh duy\u1ec7t v\u1edbi ph\u00edm F12, v\u00e0 l\u1ef1a ch\u1ecdn \u201cConsolo\u201d trong menu.<\/p>\n\n\n\n
V\u00ed d\u1ee5<\/h3>\n\n\n\n<!DOCTYPE html>\n<html>\n<body><h1>Trang web \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i<\/h1>\n<p>\u0110o\u1ea1n v\u0103n b\u1ea3n \u0111\u1ea7u ti\u00ean c\u1ee7a t\u00f4i.<\/p><script>\nconsole.log(7 + 8);\n<\/script>\n<\/body>\n<\/html><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"Hi\u1ec3n th\u1ecb, xu\u1ea5t d\u1eef li\u1ec7u sau khi x\u1eed l\u00fd r\u1ea5t quan tr\u1ecdng ph\u1ea3i kh\u00f4ng? Ch\u00fang ta c\u00f9ng xem JavaScript c\u00f3 c\u00e1c h\u00e0m n\u00e0o h\u1ed7 tr\u1ee3 c\u00f4ng vi\u1ec7c n\u00e0y nh\u00e9. C\u00e1c kh\u1ea3 n\u0103ng \u201chi\u1ec3n th\u1ecb\u201d c\u1ee7a JavaScript JavaScript c\u00f3 kh\u1ea3 n\u0103ng \u201chi\u1ec3n th\u1ecb\u201d d\u1eef li\u1ec7u theo c\u00e1c c\u00e1ch sau: Hi\u1ec3n th\u1ecb h\u1ed9p tho\u1ea1i th\u00f4ng b\u00e1o, s\u1eed …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[236],"tags":[],"yoast_head":"\n
C\u00e1c t\u00ednh n\u0103ng hi\u1ec3n th\u1ecb, xu\u1ea5t d\u1eef li\u1ec7u \u0111\u1ea7u ra c\u1ee7a JavaScript • Ki\u1ebfn c\u00e0ng<\/title>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\t\n\t\n\t\n","yoast_head_json":{"title":"C\u00e1c t\u00ednh n\u0103ng hi\u1ec3n th\u1ecb, xu\u1ea5t d\u1eef li\u1ec7u \u0111\u1ea7u ra c\u1ee7a JavaScript • Ki\u1ebfn c\u00e0ng","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/kiencang.net\/cac-tinh-nang-hien-thi-xuat-du-lieu-dau-ra-cua-javascript\/","og_locale":"vi_VN","og_type":"article","og_title":"C\u00e1c t\u00ednh n\u0103ng hi\u1ec3n th\u1ecb, xu\u1ea5t d\u1eef li\u1ec7u \u0111\u1ea7u ra c\u1ee7a JavaScript • Ki\u1ebfn c\u00e0ng","og_description":"Hi\u1ec3n th\u1ecb, xu\u1ea5t d\u1eef li\u1ec7u sau khi x\u1eed l\u00fd r\u1ea5t quan tr\u1ecdng ph\u1ea3i kh\u00f4ng? Ch\u00fang ta c\u00f9ng xem JavaScript c\u00f3 c\u00e1c h\u00e0m n\u00e0o h\u1ed7 tr\u1ee3 c\u00f4ng vi\u1ec7c n\u00e0y nh\u00e9. 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