DevExpress 数字自增输入框

                            <dx:ASPxSpinEdit ID="txtHourStart" ClientInstanceName="txtHourStart" runat="server" Width="60px" MinValue="0" MaxValue="23" NullText="8"  AutoPostBack="False">
                                <ClientSideEvents ValueChanged="function(s, e) {chartHumi.PerformCallback();chartTemp.PerformCallback();}"></ClientSideEvents>
                            </dx:ASPxSpinEdit>