JavaScript while ??
while ??
while ??? ??? ??? true? ?? ?? ??? ?????.
Syntax
while(??)
{
??? ??
}
?
? ??? ??? ?? i? ? ?? ? ?? ?????. 10??:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
</head>
<body>
<p>點(diǎn)擊下面的按鈕，只要 i 小于 5 就一直循環(huán)代碼塊。</p>
<button onclick="myFunction()">點(diǎn)擊這里</button>
<p id="demo"></p>
<script>
function myFunction(){
var x="",i=0;
while (i<5){
x=x + "該數(shù)字為 " + i + "<br>";
i++;
}
document.getElementById("demo").innerHTML=x;
}
</script>
</body>
</html> NOTE: ??? ??? ??? ?? ????? ?? ?? ?? ??? ??? ????. ?? ?? ????? ??? ? ????.
????? ???? ??? ???
do/while ??
do/while ??? while ??? ?????. ??? ??? ??? ???? ?? ?? ??? ? ? ??? ??, ??? ??? ??? ?????.
Syntax
do
{
??? ??
}
while(??);
??
?? ???? do/while ??? ?????. ??? ??? ????? ?? ?? ??? ???? ??? ??? ?????? ? ? ?????.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
</head>
<body>
<p>點(diǎn)擊下面的按鈕，只要 i 小于 5 就一直循環(huán)代碼塊。</p>
<button onclick="myFunction()">點(diǎn)擊這里</button>
<p id="demo"></p>
<script>
function myFunction(){
var x="",i=0;
do{
x=x + "該數(shù)字為 " + i + "<br>";
i++;
}
while (i<5)
document.getElementById("demo").innerHTML=x;
}
</script>
</body>
</html>????? ???? ??? ???
