获取单选按钮的值

<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是为了减少整个页面的检索范围