js获取UserControl (<uc1>)控件ID

<table>
<tr>
 <td>
        <uc1:uccalendar id="ucXudaxia" runat="server"  />
</td>
</tr>
</table>

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="UCxdx.ascx.cs" Inherits="UCxdx" %>
<asp:TextBox ID="txtXDX" runat="server" CssClass="txtXDX" Width="80px" ></asp:TextBox>
<asp:Image ID="showCal" runat="server" />
<asp:Literal ID="litJS" runat="server" ></asp:Literal>

<script type="text/ecmascript">
function test(){
    var t1= document.getElementById(‘<%=ucXudaxia.ClientID%>‘ + "_txtXDX"); //
}
</script>