更新子组件的父状态

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

const ParentComponent = () => {
  const [count, setCount] = useState(0);

  const updateParentState = (newCount) => {
    setCount(newCount);
  };

  return (
    <div>
      <h1>父组件状态：{count}</h1>
      <ChildComponent count={count} onUpdate={updateParentState} />
    </div>
  );
};

export default ParentComponent;

// 子组件
import React from 'react';

const ChildComponent = ({ count, onUpdate }) => {
  const handleClick = () => {
    const newCount = count + 1;
    onUpdate(newCount); // 调用父组件传递的回调函数，更新父组件的状态
  };

  return (
    <div>
      <h2>子组件</h2>
      <button onClick={handleClick}>更新父状态</button>
    </div>
  );
};

export default ChildComponent;