how can I access class name without using id

I have following div tag:

<div class="aa bb cc">
</div>

their are three classes if i access class then which one will be access.

Your question is not clear( or I might not understood it correctly)

their are three classes if i access class then which one will be access.

What do you mean by "if I access class then which one will be accessed"?
Normally we are accessing the element using a class

var divElement1 = $('.aa')

or

var divElement2 = $('.bb')

or

var divElement3 = $('.cc')

All 3 variables (divElement1 ,divElement2 and divElement3) are going to be the same div

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.