React Hooks:无法从子组件向父组件发送状态

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

function ParentComponent() {
  const [state, setState] = useState('');

  const handleStateChange = (newState) => {
    setState(newState);
  };

  return (
    <div>
      <ChildComponent onStateChange={handleStateChange} />
      <p>父组件状态：{state}</p>
    </div>
  );
}

// 子组件
import React from 'react';

function ChildComponent({ onStateChange }) {
  const handleClick = () => {
    const newState = '新的状态';
    onStateChange(newState);
  };

  return (
    <button onClick={handleClick}>发送状态给父组件</button>
  );
}