CHECK FOR NUMBER IN JAVASCRIPT
Run 
<!doctype html>
	<head>
		<title>Check for Number in JavaScript</title>
	</head>
	<body>
		<div id="result_one"></div>
		<div id="result_two"></div>

		<script>
			/* JS comes here */
            var num = 1;
            var str = "Studytonight";
            
            document.getElementById("result_one").innerHTML = typeof str;
            
            if(!isNaN(num)) {
                document.getElementById("result_two").innerHTML = num + " is a number";
            }
            else {
                document.getElementById("result_two").innerHTML = num + " is not a number";
            }
		</script>
	</body>
</html>