While-4

Example of JavaScript while statement:

<!DOCTYPE html>
<html>
<head>

</head>    
<body>
<button onclick="myFunction()">Click it</button>
<p id="sample"></p>

<script>
function myFunction() {
    var sum = 0;
    var number = 1;
    while (number <= 50) {  
      sum += number;        
      number++;             
    }
    alert("Sum = " + sum);  
}
document.getElementById("sample").innerHTML = i;
</script>
</body>
</html>

Output