<div id="wrap">
<input type="radio" name="aa" value="1" id="xz1" />
<input type="radio" name="aa" value="2" id="xz2" />
</div>
js:
var sss = $(‘#wrap input[name="aa"]:checked ‘).val();
原文:http://www.cnblogs.com/changxiaosen/p/7071670.html