后台执行js方法

                       const string sJscript = @"<script>
                        var vTrSystem=document.getElementById('trAnmCategory');
                        if( vTrSystem.style.display!='none')
                        {
                             vTrSystem.style.display='none';
                        }
                        </script>";
                        Page.RegisterStartupScript("", sJscript);

RegisterStartupScript格式：

Page.RegisterStartupScript(key, script);