To print a triangle formed of “#”, you need to use a nested “for loop”.
Example
Try the following code to print a triangle −
<html>
<head>
<body>
<p>Printing a triangle</p>
<script>
var i, j;
for(i=1; i < 5; i++) {
//inner loop
for(j=1; j<=i; j++) {
document.write('#');
}
document.write('<br/>');
}
</script>
</body>
</html> Output
Printing a triangle # ## ### ####