Document Controlled vs Uncontrolled Component Design pattern

pursuant to this discussion https://twitter.com/dan_abramov/status/1001943857096003584

all react components can be:

• controlled (no internal state)
• uncontrolled (internal state)
• mixed (uncontrolled by default, unless some props are passed to make it controlled)

the current docs on controlled vs uncontrolled: https://reactjs.org/docs/uncontrolled-components.html focus entirely on forms, but this design pattern applies to -all- components. we should document this.

questions

1. What else should we say in the docs?
2. do we want to tell people that they can do "mixed control" or do we leave that for people to discover for themselves?
3. is this the same page as https://reactjs.org/docs/uncontrolled-components.html or is it a separate page?

從現有的 uncontrolled-components.html 文件和連結的討論開始。釐清 controlled、uncontrolled 和 mixed component patterns 應歸入此頁面還是獨立頁面，並確定文件應提供哪些指引。完成的標準是，選定的文件清楚涵蓋表單以外的該模式，並回答範圍方面尚未解決的問題。