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>点击下面的按钮，只要 i 小于 5 就一直循环代码块。</p>
<button onclick="myFunction()">点击这里</button>
<p id="demo"></p>
<script>
function myFunction(){
var x="",i=0;
do{
x=x + "该数字为 " + i + "<br>";
i++;
}
while (i<5)
document.getElementById("demo").innerHTML=x;
}
</script>
</body>
</html> 
