react中简单时间计数器

import React, { useState, useEffect } from 'react';

function Timer() {
  const [time, setTime] = useState(0);

  useEffect(() => {
    const interval = setInterval(() => {
      setTime(prevTime => prevTime + 1);
    }, 1000);

    return () => clearInterval(interval); // 清除定时器
  }, []);

  return (
    <div>
      <h1>Time: {time} seconds</h1>
    </div>
  );
}

export default Timer;

useEffect(() => {
  const interval = setInterval(() => {
    setTime(prevTime => prevTime + 1);
  }, 1000);

  return () => clearInterval(interval); // 清除定时器
}, []);

const [time, setTime] = useState(0);