Widget _buildButtonNumberBadge(BuildContext context) {
    return Container(
        alignment: Alignment.bottomLeft,
        margin: const EdgeInsets.only(left: 16),
        child: SizedBox(
          width: 86,
          height: 54,
          child: Stack(
            alignment: Alignment.bottomLeft,
            children: [
              TDButton(
                width: 80,
                height: 48,
                text: '按钮',
                size: TDButtonSize.large,
              ),
              Positioned(
                child: TDBadge(
                  TDBadgeType.message,
                  count: '8',
                ),
                right: 0,
                top: 0,
              )
            ],
          ),
        ));
  }