Modal在子组件中，按钮在父组件中如何在reactjs中关闭模式

class ParentComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      showModal: false
    };
  }

  closeModal = () => {
    this.setState({ showModal: false });
  }

  render() {
    return (
      <div>
        <ChildComponent closeModal={this.closeModal} />
        <button onClick={() => this.setState({ showModal: true })}>打开模态框</button>
        {this.state.showModal && <Modal closeModal={this.closeModal} />}
      </div>
    );
  }
}

class ChildComponent extends React.Component {
  render() {
    return (
      <div>
        <button onClick={this.props.closeModal}>关闭模态框</button>
      </div>
    );
  }
}