JavaScript while 循環(huán)
while 循環(huán)是JavaScript 中最簡單的循環(huán)，其語法為：
while (expr){
? ?statement
}
#此語法表示，只要expr 表達(dá)式為TRUE，那麼就一直執(zhí)行statement 直到expr 為FALSE為止，statement 表示要執(zhí)行的動作或邏輯。
下面的範(fàn)例利用while 迴圈輸出1到10：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
<script type="text/javascript">
var i = 1;
while (i <= 10) {
document.write(i + "<br />");
i++;
}
</script>
</head>
<body>
</body>
</html>運(yùn)行結(jié)果：
1
2
3
4
5
6
7
8
9
10
##do while迴圈
do while 迴圈和while 迴圈非常相似，其區(qū)別只是在於do while 保證必須執(zhí)行一次，而while 在表達(dá)式不成立時(shí)則可能不做任何操作。 do while 迴圈語法：do { ? statement
}while (expr)
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
<script type="text/javascript">
var i = 1;
do {
document.write(i + "<br />");
i++;
} while (i <= 10);
</script>
</head>
<body>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
</head>
<body>
<script>
cars=["BMW","Volvo","Saab","Ford"];
var i=0;
for (;cars[i];){
document.write(cars[i] + "<br>");
i++;
}
</script>
</body>
</html>使用?while 迴圈<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
</head>
<body>
<script>
cars=["BMW","Volvo","Saab","Ford"];
var i=0;
while (cars[i]){
document.write(cars[i] + "<br>");
i++;
}
</script>
</body>
</html>
