将一个函数中的数据传递给React组件内的另一个函数

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 data={this.state.data} onDataChange={this.handleDataChange} />
      </div>
    );
  }
}

export default ParentComponent;

import React from 'react';

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

  render() {
    return (
      <div>
        <button onClick={this.handleClick}>Update Data</button>
        <p>{this.props.data}</p>
      </div>
    );
  }
}

export default ChildComponent;