Widget _fixedFirstColTable(BuildContext context) {
    return TDTable(
      columns: [
        TDTableCol(title: '标题', colKey: 'title1'),
        TDTableCol(title: '标题', colKey: 'title2'),
        TDTableCol(title: '标题', colKey: 'title3'),
        TDTableCol(title: '标题', colKey: 'title4', fixed: TDTableColFixed.left),
      ],
      data: _getData(10),
    );
  }