如何在ReactJS中处理道具？

class ParentComponent extends React.Component {
  render() {
    return <ChildComponent propName={propValue} />;
  }
}

class ChildComponent extends React.Component {
  render() {
    const propValue = this.props.propName;
    // 使用propValue进行操作
    return <div>{propValue}</div>;
  }
}

class ChildComponent extends React.Component {
  render() {
    const propValue = this.props.propName;
    return <div>{propValue}</div>;
  }
}

class ParentComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      propValue: 'Initial Value'
    };
  }

  handleClick = () => {
    this.setState({ propValue: 'New Value' });
  }

  render() {
    return (
      <div>
        <button onClick={this.handleClick}>Update Prop</button>
        <ChildComponent propName={this.state.propValue} />
      </div>
    );
  }
}