深入理解Widget有状态和无状态

参考https://www.jb51.net/article/263730.htm

无状态

StatelessWidget 

class LessComponent extends StatelessWidget {
  const LessComponent({Key? key}) : super(key: key);
  @override
  Widget build(BuildContext context) {
    return Container();
  }
}

　有状态--State

StatefulWidget 

class FulComponent extends StatefulWidget {
  const FulComponent({Key? key}) : super(key: key);
  @override
  _FulComponentState createState() => _FulComponentState();
}
class _FulComponentState extends State<FulComponent> {
  @override
  Widget build(BuildContext context) {
    return Container();
  }
}