How to get element class using jquery

This is a tutorial of getting <strong>element class using jquery</strong>

by Nikhil Mangal

HTML

<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<div class="testdiv">Click Me To Know My Class Name</div>

JavaScript

$(document).ready(function(){
		$('.testdiv').click(function(){
			$class_name=$(this).attr('class');
			alert("My Class Name is : "+$class_name);
		});
	});