请自行实现：树表格第一层不设置_parentId即可，其它层级都要设置_parentId
                    var rows = r.data;
                    r.rows = rows;
                    var rootType;
                    for (var i = 0; i < rows.length; i++) {
                        if (r.type === 'q') {
                            if (i === 0) {
                                rootType = rows[i].type;
                            }
                            if (rows[i].type !== rootType) {
          