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JavaScript while loop

JavaScript while loop

As long as the specified condition is true, the loop can continue to execute the code block.

while loop

The while loop loops through a block of code when a specified condition is true.

Syntax

while (condition)
{
Code to be executed
}

Example

Loop in this example Will continue to run as long as variable i is less than 5: 

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</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>
Continuing Learning
||
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> </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>
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