jQuery div removeClass() / addClass()

Question

I have a particular div element with "testDiv" class;

<div class="testDiv">Content</div>

Now using jQuery I want to remove the testDiv class and add a different class;

jQuery('div').removeClass('testDiv');

Now how can I add a class to this particular div that got its class remove, i fear that if I do jQuery('div').addClass('newClass'); it will add a class to all the other divs present in the page.

Answer 1

怎么样：

jQuery('div.testDiv').addClass('newClass').removeClass('testDiv');

Answer 2

jQuery('div.testDiv').toggleClass("testDiv newClass")