Check the variable type
Description
jQuery has a custom .type() method for checking type:
$.type(null); // returns null
$.type([]); // returns array
Example
<!DOCTYPE html>
<html>
<head>
<script src="http://yourServer.com/jQuery/jquery.min.js"></script>
<script>
console.log($.type(null)); // returns null
console.log($.type([])); // returns array
</script>
</head> <!-- w w w. ja v a2s . c om-->
<body>
<p>Your tags here</p>
</body>
</html>