src code

instance method Element#toggleClassName

Element#toggleClassName(className) → Element

Toggles the presence of CSS class className on element.

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

Then:

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

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.