如何在easyui datagrid 中显示外键的值

columns: [[
                        { field: ‘ck‘, checkbox: true, align: ‘left‘, width: 20 },
                        { field: ‘RoleName‘, title: ‘角色名称‘, width: 80 },
                        {
                            field: ‘Dictionary‘, title: ‘角色类别‘, width: 100,
                            formatter: function (value, row, index) {
                                return new Object(row["Dictionary"]).Name;
                            }
                        },
                        {
                            field: ‘UpdateTime‘, title: ‘最后更新时间‘, width: 50, align: ‘left‘,
                            formatter: function (value, row, index) {
                                var datetime = TimeObjectUtil.formatterDateTime(value);

                                return datetime;
                            }
                        },
                        { field: ‘Description‘, title: ‘备注‘, width: 150 },


                ]]