//科室改变，级联医生 js        $("#DepartmentId").change(function () {            if (isNaN($(this).val())) {                $("#DoctorId option:gt(0)").remove();            }            else {                $.post(‘/JK/Json/JsonDoctorList/‘, { departmentId: $(this).val() }, function (data) {                    if (data.Success) {                        $("#DoctorId option:gt(0)").remove();                        $.each(data.Content, function (i, o) {                            $("<option />").text(o.Name).val(o.Id).appendTo("#DoctorId");                        });                    }                    else {                        $.alert(data.ErrorMessage);                    }                });            }        });///////controller actionpublic ActionResult JsonDoctorList(int? departmentId )        {            JsonData ret = new JsonData();            JkDoctorRepository rep = new JkDoctorRepository();            try            {                if (departmentId.HasValue)                {                    ret.Content = rep.FindByDepartmentId(departmentId.Value);                }            }            catch (Exception ex)            {                ret.Success = false;                ret.ErrorMessage = ex.Message;            }            return Json(ret);        }