src code

class method Element.hasClassName

Element.hasClassName(element, className) → Boolean

Checks for the presence of CSS class className on element.

Examples
<div id="mutsu" class="apple fruit food"></div>

Then:

$('mutsu').hasClassName('fruit');
// -> true
 $('mutsu').hasClassName('vegetable');
// -> false

This method can be called either as an instance method or as a generic method. If calling as a generic, pass the instance in as the first argument.