在REACT.js中，如何将状态从子组件传递到父组件作为道具

// 父组件
class ParentComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      childState: ''
    };
  }

  handleChildState = (state) => {
    this.setState({ childState: state });
  }

  render() {
    return (
      <div>
        <ChildComponent onStateChange={this.handleChildState} />
        <p>子组件传递的状态：{this.state.childState}</p>
      </div>
    );
  }
}

// 子组件
class ChildComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      inputValue: ''
    };
  }

  handleChange = (event) => {
    this.setState({ inputValue: event.target.value });
  }

  handleButtonClick = () => {
    this.props.onStateChange(this.state.inputValue);
  }

  render() {
    return (
      <div>
        <input type="text" value={this.state.inputValue} onChange={this.handleChange} />
        <button onClick={this.handleButtonClick}>传递状态</button>
      </div>
    );
  }
}