从子组件激发方法时，父组件中的状态不会更新

// 父组件
class ParentComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      count: 0
    };
  }

  updateState = (newCount) => {
    this.setState({
      count: newCount
    });
  }

  render() {
    return (
      <div>
        <ChildComponent updateState={this.updateState} />
        <p>Count: {this.state.count}</p>
      </div>
    );
  }
}

// 子组件
class ChildComponent extends React.Component {
  handleClick = () => {
    this.props.updateState(5); // 通知父组件更新状态
  }

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