<asp:Label ID="Lbl_X" runat="server" Text="text" style="display:none"></asp:Label> <asp:Label ID="Lbl_Xn" runat="server" Text="text" style="display:none"></asp:Label> JS:   <%-- 設置選中--%>     <script type="text/javascript">         var X = document.getElementById('<%=this.Lbl_X.ClientID %>').innerText;         var Xn = document.getElementById('<%=this.Lbl_Xn.ClientID %>').innerText;         var div = document.getElementById(X);         if (div != null) {             div.setAttribute("class", 'nav-top-item current');         }         var div2 = document.getElementById(Xn);         if (div != null) {             div2.setAttribute("class", 'current');         }     </script>    

            Label X = (Label)this.Master.FindControl("Lbl_X");             X.Text = "A";             Label Xn = (Label)this.Master.FindControl("Lbl_Xn");             Xn.Text = "A1";