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並前往https://egghead.io/lessons/react-track-values-over-the-course-of-renders-with-react-useref-in-a-custom-useprevious-hook

Track Values Over the Course of Renders with React useRef ...

this took me a minute to understand. function usePrevious(value) { const ref = useRef() useEffect(() => { ref.current = value }) return ref.current }.

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