忘了咋写了

C# code

  function execl()
        {
            var name = document.getElementById("txtSelectUserID").value;
            winOpen("inc/ExportExcel.aspx?id='" + name + "'");
        }

<asp:TextBox ID="txtSelectUserID" runat="server"></asp:TextBox>

你要做什么

protected void Page_Load(object sender, EventArgs e)
  {
  Button1.Attributes.Add("onClick", "execl()");
  }