强制组件重新呈现

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      count: 0
    };
  }

  handleClick() {
    // 更新状态
    this.setState({
      count: this.state.count + 1
    });

    // 强制重新呈现组件
    this.forceUpdate();
  }

  render() {
    return (
      <div>
        <p>Count: {this.state.count}</p>
        <button onClick={() => this.handleClick()}>Increase Count</button>
      </div>
    );
  }
}

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      count: 0
    };
  }

  handleClick() {
    // 更新状态
    this.setState({
      count: this.state.count + 1
    });
  }

  render() {
    return (
      <div>
        <p key={this.state.count}>Count: {this.state.count}</p>
        <button onClick={() => this.handleClick()}>Increase Count</button>
      </div>
    );
  }
}