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JavaScript for in Statement - Freetuts
CĂN BẢN
DOM & BOM
XỨ LÝ FORM
JAVASCRIPT TIPS
TUTORIALS
CÁC CHỦ ĐỀ
BÀI MỚI NHẤT
JavaScript for in Statement
Định nghĩa và cách sử dụng
Vòng lặp for in sử dụng để lặp qua tất cả các thuộc tính của một đối tượng.
Bài viết này được đăng tại freetuts.net , không được copy dưới mọi hình thức.
Các lệnh Javascript trong khối lệnh sẽ được thực hiện lặp đi lặp lại cho đến khi đã lặp qua hết các thuộc tính của đối tượng.
Javascript cung cấp cho người sử dụng 4 loại vòng lặp:
for - thực thi các lệnh trong khối một số lần nhất định.
for in - lặp qua hết các thuộc tính của một đối tượng.
while - thực hiện các lệnh trong khối lệnh khi điều kiện còn trả về True.
do while - thực hiện khối lệnh một lần sau đó lặp lại khối lệnh khi điều kiện còn trả về True.
Lưu ý : Không sử dụng vòng lặp for in đối với các mảng, đối với các mảng nên sử dụng vòng lặp for.
Bài viết này được đăng tại [free tuts .net]
Cú pháp
Cú pháp
for (var in object) {
code
}
Trong đó :
var là tham số, cái sẽ được lặp đi lặp lại đối với mỗi thuộc tính của đối tượng, var sẽ nhận giá trị là tên thuộc tính đối với mỗi lần lặp.
object là đối tượng sẽ được lặp.
code là các lệnh sẽ được thực thi mỗi một lần lặp.
Technical Details
Phiên bản Javascript : ECMAScript 1
Ví dụ
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<h1>Học lập trình miễn phí tại freetuts.net</h1>
<p id="result"></p>
<button onclick="myFunction()">Run</button>
<script>
function myFunction() {
var language = {name:"Javascript", framework:"Boostrap", author:"freetuts"};
var text = "";
var x;
for (x in language) {
text += language[x] + ' <br> ';
}
document.getElementById("result").innerHTML = text;
}
</script>
</body>
</html>
Kết quả
Javascript
Boostrap
freetuts
Tham khảo: w3schools.com
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