<\/span><\/h2>\n\n\n\nTh\u01b0\u1eddng c\u00e2u l\u1ec7nh 3 \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 t\u0103ng gi\u00e1 tr\u1ecb kh\u1edfi t\u1ea1o.<\/p>\n\n\n\n
Nh\u01b0ng kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng nh\u01b0 th\u1ebf, JavaScript kh\u00f4ng quan t\u00e2m. C\u00e2u l\u1ec7nh 3 l\u00e0 tu\u1ef3 ch\u1ecdn.<\/p>\n\n\n\n
C\u00e2u l\u1ec7nh 3 c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n b\u1ea5t c\u1ee9 \u0111i\u1ec1u g\u00ec nh\u01b0 gi\u1ea3m \u0111i m\u1ed9t gi\u00e1 tr\u1ecb (i–), t\u0103ng th\u00eam gi\u00e1 tr\u1ecb (i = i +15), ho\u1eb7c b\u1ea5t c\u1ee9 \u0111i\u1ec1u g\u00ec kh\u00e1c.<\/p>\n\n\n\n
C\u00e2u l\u1ec7nh 3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c b\u1ecf qua (ch\u1eb3ng h\u1ea1n khi b\u1ea1n t\u0103ng gi\u00e1 tr\u1ecb b\u00ean trong v\u00f2ng l\u1eb7p r\u1ed3i):<\/p>\n\n\n\n
V\u00ed d\u1ee5:<\/p>\n\n\n\n
var i = 0;\n var len = cars.length;\nfor (; i < len; ) {\n text += cars[i] + \"<br>\";\n i++;\n }<\/code><\/pre>\n\n\n\n
\n\n\n\n<\/span>V\u00f2ng l\u1eb7p For\/In<\/span><\/h2>\n\n\n\nC\u00e2u l\u1ec7nh for\/in<\/code> trong v\u00f2ng l\u1eb7p JavaScript th\u00f4ng qua thu\u1ed9c t\u00ednh c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng:<\/p>\n\n\n\nV\u00ed d\u1ee5:<\/p>\n\n\n\n
var person = {fname:\"\u0110\u1ee9c Anh\", lname:\"Nguy\u1ec5n\", age:30};\n\n var text = \"\";\n var x;\n\nfor (x in person) {\n text += person[x];\n}<\/code><\/pre>\n\n\n\n
\n\n\n\n<\/span>V\u00f2ng l\u1eb7p While<\/span><\/h2>\n\n\n\nV\u00f2ng l\u1eb7p while v\u00e0 do\/while s\u1ebd \u0111\u01b0\u1ee3c gi\u1ea3i th\u00edch trong b\u00e0i kh\u00e1c b\u1ea1n nh\u00e9.<\/p>\n","protected":false},"excerpt":{"rendered":"
V\u00f2ng l\u1eb7p c\u00f3 t\u00e1c d\u1ee5ng th\u1ef1c thi kh\u1ed1i code v\u1edbi m\u1ed9t s\u1ed1 l\u1ea7n nh\u1ea5t \u0111\u1ecbnh. V\u00f2ng l\u1eb7p r\u1ea5t ti\u1ec7n d\u1ee5ng n\u1ebfu b\u1ea1n mu\u1ed1n ch\u1ea1y c\u00f9ng \u0111o\u1ea1n code nhi\u1ec1u l\u1ea7n, m\u1ed7i l\u1ea7n v\u1edbi m\u1ed9t gi\u00e1 tr\u1ecb kh\u00e1c nhau. Th\u01b0\u1eddng th\u00ec \u0111\u00e2y l\u00e0 tr\u01b0\u1eddng h\u1ee3p khi l\u00e0m vi\u1ec7c v\u1edbi m\u1ea3ng (arrays): Thay v\u00ec vi\u1ebft: B\u1ea1n c\u00f3 th\u1ec3 …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[236],"tags":[],"yoast_head":"\n
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