五、布局

一、弹性布局

class _HomeContnetState extends State {
  int _conuter = 1;
  @override
  Widget build(BuildContext context) {
    return Row(
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      children: <Widget>[
        RaisedButton(child: Text("html"),),
        RaisedButton(child: Text("html"),),
        RaisedButton(child: Text("html"),),
      ],
    );
  }
}