do...while

js/script.js

function funMake() {
var val = 0;
var i = 0;
do {
i++;
document.write('Hello World!');
} while(val!=0);
}

function funMake() {
 var val = 0;
 var i = 0;

 do {
  i++;
  document.write('Hello World!');
 } while(val!=0);
}

index.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>New Page</title>
<script src="js/script.js"></script>
</head>
<body>
<script>
funMake();
</script>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>New Page</title>
<script src="js/script.js"></script>
</head>
<body>
<script>
funMake();
</script>
</body>
</html>