.net利用AJAX实现局部刷新

前台:

    <div>
        <asp:ScriptManager ID="ScriptManager1" runat="server" EnableScriptLocalization="true" EnablePageMethods="true">
        </asp:ScriptManager>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
            <ContentTemplate>
                <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
            </ContentTemplate>
            <Triggers>
                <asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
            </Triggers>
        </asp:UpdatePanel>
        <asp:Timer ID="Timer1" runat="server" Interval="1000" OnTick="Tick"></asp:Timer>
    </div>

后台:

    protected void Tick(object sender, EventArgs e)
    {
            this.Label1.Text = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
    }