Widget _basicTable(BuildContext context) {
    return TDTable(
      columns: [
        TDTableCol(title: '标题', colKey: 'title1', ellipsis: true),
        TDTableCol(title: '标题', colKey: 'title2'),
        TDTableCol(title: '标题', colKey: 'title3'),
        TDTableCol(title: '标题', colKey: 'title4')
      ],
      data: _getData(9),
    );
  }