JS获取RadioButtonList的Value值

 <script type ="text/javascript" >
        function Display(obj)
        {              
   var rds=obj.getElementsByTagName("input");
 
   for(var i=0;i<rds.length;i++)
   {
                 if(rds[i].type=="radio")
  {
     if(rds[i].checked)
     {
   alert(rds[i].value);
     }
  }  
          }
 }
    </script>

<asp:RadioButtonList ID="RadioButtonList1" runat="server" onclick="Display(this)"
            RepeatDirection="Horizontal">
            <asp:ListItem Value="0">差旅费用报销单</asp:ListItem>
            <asp:ListItem Value="1">费用报销单</asp:ListItem>
            <asp:ListItem Value="2">付款申请单</asp:ListItem>
        </asp:RadioButtonList>