.net ddl联动(js)

 <asp:DropDownList ID="ddlVolumeTitle" runat="server" AppendDataBoundItems="True"
                                                              onchange="ddlSelectTitleChange()"

 ddlVolumeSequence.Attributes.Add("onchange", "ddlSelectSequenceChange()");
        ddlVolumeTitle.Attributes.Add("onchange", "ddlSelectTitleChange()");