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並前往https://zkat.site/2020/04/17/%E5%AE%9E%E7%8E%B0%E4%B8%80%E4%B8%AA%E8%8E%B7%E5%8F%96%E4%B8%8A%E4%B8%80%E8%BD%AEprops%E5%92%8Cstate%E7%9A%84%E8%87%AA%E5%AE%9A%E4%B9%89Hook/

实现一个获取上一轮props和state的自定义Hook | ZKAT

const usePrevious = (preValue) => { const ref = useRef(); useEffect(() => { ref.current = preValue; }, [preValue]) return ref.current; } ...

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