js控制单选框

<input id="rbtn_Select" runat="server"  type='radio'   name='rbtn_Select'  value= '<%#Eval("guid") %>' onclick="changeName(this)" />

 

<script>
    //让所有radio取消选中
    function changeName(a) {
        var inputs = document.getElementsByTagName("input");
        for (var i = 0; i < inputs.length; i++) {
            if (inputs[i].type == "radio") {
                inputs[i].checked = "";
            }
        }
        var ipt = a;
        //alert(ipt);
        ipt.checked = true;
    }
    </script>