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並前往https://kodaps.com/creating-a-custom-hook-usecountdown-creating-a-react-quiz-app-part-2-72c82ca83b49

How to create a custom countdown hook with useEffect and ...

Our code now looks like this: const Timer: React.FC<void> = () => { let [counter, setCounter] = useState(10); const intervalRef = useRef<number>();

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