{"id":3262,"date":"2016-07-14T05:12:08","date_gmt":"2016-07-14T05:12:08","guid":{"rendered":"https:\/\/kiencang.net\/?p=3262"},"modified":"2016-07-14T05:12:08","modified_gmt":"2016-07-14T05:12:08","slug":"chuyen-doi-dinh-dang-trong-javascript","status":"publish","type":"post","link":"https:\/\/kiencang.net\/chuyen-doi-dinh-dang-trong-javascript\/","title":{"rendered":"Chuy\u1ec3n \u0111\u1ed5i \u0111\u1ecbnh d\u1ea1ng d\u1eef li\u1ec7u trong trong JavaScript"},"content":{"rendered":"\n

JS c\u00f3 hai c\u1ea5p \u0111\u1ed9 so s\u00e1nh b\u1eb1ng nhau, c\u1ea5p \u0111\u1ed9 th\u1ee9 nh\u1ea5t s\u1eed d\u1ee5ng hai d\u1ea5u ==<\/code> th\u00ec hai v\u1ebf ch\u1ec9 c\u1ea7n c\u00f3 gi\u00e1 tr\u1ecb gi\u1ed1ng nhau l\u00e0 s\u1ebd tr\u1ea3 v\u1ec1 gi\u00e1 tr\u1ecb TRUE<\/code>.<\/p>\n\n\n\n

\u1ede c\u1ea5p \u0111\u1ed9 ti\u1ebfp theo, s\u1eed d\u1ee5ng ba d\u1ea5u ===<\/code> \u0111\u1ec3 th\u1ef1c hi\u1ec7n so s\u00e1nh th\u00ec kh\u00f4ng ch\u1ec9 y\u00eau c\u1ea7u gi\u00e1 tr\u1ecb gi\u1ed1ng nhau m\u00e0 ki\u1ec3u d\u1eef li\u1ec7u c\u0169ng ph\u1ea3i g\u1ed1ng nhau th\u00ec m\u1edbi tr\u1ea3 v\u1ec1 k\u1ebft qu\u1ea3 TRUE<\/code>, t\u1ee9c l\u00e0 ph\u00e9p so s\u00e1nh n\u00e0y ch\u1eb7t h\u01a1n (kh\u1eaft khe h\u01a1n).<\/p>\n\n\n\n

V\u00ed d\u1ee5:<\/p>\n\n\n\n

let a = 10;\nlet b = \"10\";\n\nBoolean(a==b); \/\/ s\u1ebd cho k\u1ebft qu\u1ea3 TRUE, v\u00ec d\u00f9 ki\u1ec3u d\u1eef li\u1ec7u m\u1ed9t c\u00e1i l\u00e0 s\u1ed1, m\u1ed9t c\u00e1i l\u00e0 chu\u1ed7i, gi\u00e1 tr\u1ecb c\u1ee7a n\u00f3 \u0111\u01b0\u1ee3c xem l\u00e0 b\u1eb1ng nhau.\n\n\/\/ Nh\u01b0ng c\u00e2u l\u1ec7nh b\u00ean d\u01b0\u1edbi s\u1ebd tr\u1ea3 v\u1ec1 False:\n\nBolean(a===b); \/\/ v\u00ec ki\u1ec3u d\u1eef li\u1ec7u kh\u00e1c nhau l\u00e0 \u0111\u1ee7 \u0111\u1ec3 n\u00f3 l\u00e0 False<\/code><\/pre>\n\n\n\n
OK, b\u00e2y gi\u1edd ch\u00fang ta s\u1ebd v\u00e0o b\u00e0i v\u1edbi c\u00e1c h\u00e0m chuy\u1ec3n \u0111\u1ed5i d\u1eef li\u1ec7u \u0111\u1ec3 c\u00f3 th\u1ec3 ch\u1eafc ch\u1eafn ph\u00e9p so s\u00e1nh \u0111\u00fang v\u1edbi \u00fd ch\u00fang ta.<\/p>\n\n\n\n
Number()<\/code> chuy\u1ec3n \u0111\u1ed5i th\u00e0nh d\u1ea1ng S\u1ed1, String()<\/code> chuy\u1ec3n \u0111\u1ed5i th\u00e0nh Chu\u1ed7i, Boolean()<\/code> chuy\u1ec3n \u0111\u1ed5i th\u00e0nh d\u1ea1ng Boolean.<\/p>\n\n\n\n
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M\u1ee5c l\u1ee5c<\/p>\n