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React Hooks: useEffect All In One

useEffect

https://reactjs.org/docs/hooks-effect.html

https://reactjs.org/docs/hooks-rules.html

https://overreacted.io/zh-hans/a-complete-guide-to-useeffect/

useEffect(
  () => {
    doSomething(a, b);
  },
  [a, b],// 观察值，如果是 [] 空数组，组件只会渲染一次，因为没有监听到任何值发生的变化
);

refs

https://flaviocopes.com/react-hook-useeffect/

https://css-tricks.com/run-useeffect-only-once/

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