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JavaScript while ??

JavaScript while ??

??? ??? true? ? ??? ?? ??? ?? ??? ? ????.

while ??

while ??? ??? ??? true? ? ?? ??? ?????.

Syntax

while (condition)
{
??? ??
}

Example

? ??? ??? ?? i? 5:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>

<p>點擊下面的按鈕，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>
?? ?? ? ?? ?????.
???? ??
||
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> </head> <body> <p>點擊下面的按鈕，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>