Flutter 按钮 Button

水一波 ~ （后续补上）

 RaisedButton(
    child: Text('RaisedButton'),
    onPressed: () {
      print("RaisedButton");
    },
  ),
  FlatButton(
    child: Text('FlatButton'),
    onPressed: () {
      print("FlatButton");
    },
  ),
  OutlineButton(
    child: Text("OutlineButton"),
    onPressed: () {
      print("OutlineButton");
    },
  ),
  IconButton(
    icon: Icon(
      Icons.thumb_up
    ),
    onPressed: () {
      print("IconButton");
    },
  ),
  OutlineButton.icon(
      onPressed: () {
        print("OutlineButton.icon");
      },
      icon: Icon(Icons.thumb_down),
      label: Text('OutlineButton.icon')
  ),
  RaisedButton.icon(
      onPressed: () {}, 
      icon: Icon(Icons.add), 
      label: Text(
          'RaisedButton.icon'
      )
  ),
  OutlineButton.icon(
      onPressed: () {},
      icon: Icon(Icons.search), 
      label: Text('OutlineButton.icon'
      )
  ),