class _LoginPageState extends State<LoginPage> {
  @override
  Widget build(BuildContext context) {
      ///定义触摸层
      return new GestureDetector(
        ///透明也响应处理
        behavior: HitTestBehavior.translucent,
        onTap: () {
          ///触摸手气键盘
          FocusScope.of(context).requestFocus(new FocusNode());
        },
        child: new Container(
        ),
      );
  }
}