JS Alert Box

 
<!DOCTYPE html>
<html>
<head>
  <title>JavaScript</title>
  <script>
	var a = 40;
	var b = 20;
	
	if(a > b){
		alert(b + a);
	}else{
		alert("Value of B : " + b);
	}
  </script>
</head>
<body>
</body>
</html>