JS获取RadioButtonList选中的Valuet和Text

<asp:RadioButtonList ID="rblTest" runat="server"
  RepeatDirection="Horizontal" RepeatLayout="Flow">
    <asp:ListItem Value="1" Text="第一个"></asp:ListItem>
    <asp:ListItem Value="2" Text="第二个"></asp:ListItem>
    <asp:ListItem Value="3" Text="第三个"></asp:ListItem>
    <asp:ListItem Value="4" Text="第四个"></asp:ListItem>
    <asp:ListItem Value="5" Text="第五个"></asp:ListItem>
</asp:RadioButtonList>

<input id="ibTest" type="button" value="button" onclick="GetRadioButtonList();" />

function GetRadioButtonList()
{
var rblTests=document.getElementsByName("rblTest");
var rblValue;
var rblText;
for(var i=0;i<rblTests.length;i++)
{
   if(rblTests[i].checked)
   {
     rblValue=rblTests[i].value;
     rblText=rblTests[i].nextSibling.childNodes[0].nodeValue;
     break;
   }
}

alert(rblValue);
alert(rblText);
}