在函数中从子组件调用prop不起作用

// 父组件
import React from 'react';
import ChildComponent from './ChildComponent';

class ParentComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      data: 'Hello World'
    };
  }

  handleDataChange = (newData) => {
    this.setState({ data: newData });
  }

  render() {
    return (
      <div>
        <ChildComponent onDataChange={this.handleDataChange} />
        <p>Data from child component: {this.state.data}</p>
      </div>
    );
  }
}

// 子组件
import React from 'react';

class ChildComponent extends React.Component {
  handleClick = () => {
    const newData = 'New Data';
    this.props.onDataChange(newData);
  }

  render() {
    return (
      <button onClick={this.handleClick}>Change Data</button>
    );
  }
}

export default ParentComponent;