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- Cannot run with sound null safety, because the following dependencies don't support null safety (空安全)
> https://dart.dev/null-safety/unsound-null-safety
> Andriod Studio -> Run -> Edit Config... -> Flutter -> main.dart -> Additional run args "--no-sound-null-safety"
- 需要理解组件的渲染原理
- 多看文档
- key 值的作用
- 父组件如何调用子组件的方法