Use typeof to check the type for different type variables
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">
var num1 = 1;
var num2 = 1;
var num3 = 19;
var value = "84";
var name1 = "A";
var name2 = "BB";
alert(typeof num1);
alert(typeof num2);
alert(typeof num3);
alert(typeof value);
alert(typeof name1);
alert(typeof name2);
</script>
</body>
</html>
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