<asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> //必须有且一定在updatepanel前面 <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> 　　<% =DateTime.Now.ToString()%> </ContentTemplate> <Triggers> 　　<asp:PostBackTrigger ControlID="btn" /> 　　<asp:AsyncPostBackTrigger ControlID="btn2" EventName="click" /> </Triggers> </asp:UpdatePanel> <asp:Button runat="server" Text="刷新1" id="btn"/> <asp:Button runat="server" Text="刷新2" id="btn2" /> <% =DateTime.Now.ToString()%>