<div id="wrap">
<input type="radio" name="payMethod" value="1" />支付宝 <input type="radio" name="payMethod" value="2" />财务通</div>获取一组单选按钮对象：var obj_payPlatform = $('#wrap input[name="payMethod"]');
获取被选中按钮的值 ：var val_payPlatform = $('#wrap input[name="payMethod"]:checked ').val();
ps：加外层div是为了减小整个页面的检索范围