在React中将值从计时器传递给其父对象

// 父组件
import React, { useState } from 'react';
import ChildComponent from './ChildComponent';

const ParentComponent = () => {
  const [timerValue, setTimerValue] = useState(null);

  const handleTimerValue = (value) => {
    setTimerValue(value);
  };

  return (
    <div>
      <h1>Parent Component</h1>
      <p>Timer Value: {timerValue}</p>
      <ChildComponent onTimerValue={handleTimerValue} />
    </div>
  );
};

export default ParentComponent;

// 子组件
import React, { useEffect } from 'react';

const ChildComponent = ({ onTimerValue }) => {
  useEffect(() => {
    const timer = setInterval(() => {
      const value = Math.random(); // 模拟计时器的值
      onTimerValue(value); // 将值通过回调函数传递给父组件
    }, 1000);

    return () => {
      clearInterval(timer); // 清除计时器
    };
  }, [onTimerValue]);

  return (
    <div>
      <h2>Child Component</h2>
    </div>
  );
};

export default ChildComponent;