const




    
 CounterWithInterval = () => {
    const [count, setCount] = useState(0);
    useEffect(() => {
        const timer = setInterval(() => {
            setCount((count) => count + 1);
        }, 1000);
        return () => {
            clearInterval(timer);
    }, []);
    return <h1>Interval: {count}</h1>;

Edit React Hooks 实现计数器效果

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