jQuery如何获取被选中radio的值？实例代码：

<script type="text/javascript" src="jquery-1.8.3.min.js"></script>

<form id="myForm">
<input type="radio" value="xxx" name="radioName" checked>
</form>

<script>
var a = $('input[name=radioName]:checked', '#myForm').val()
alert(a);
</script>