What is the difference between using constructor vs getInitialState in React / React Native?

問題：

I've seen both used interchangeably.我見過兩者交替使用。

What are the main use cases for both?兩者的主要用例是什麼？ Are there advantages / disadvantages?有沒有優點/缺點？ Is one a better practice?一種更好的做法嗎？

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解決方案：

參考一： https://en.stackoom.com/question/24gEQ
參考二： https://stackoom.com/question/24gEQ