如何在react js中刷新组件

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

  refreshComponent() {
    this.setState({ count: this.state.count + 1 });
  }

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

class MyComponent extends React.Component {
  refreshComponent() {
    this.forceUpdate();
  }

  render() {
    return (
      <div>
        <p>Current time: {new Date().toLocaleTimeString()}</p>
        <button onClick={() => this.refreshComponent()}>Refresh</button>
      </div>
    );
  }
}

class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      key: 1
    };
  }

  refreshComponent() {
    this.setState({ key: this.state.key + 1 });
  }

  render() {
    return (
      <div key={this.state.key}>
        <p>Component with key: {this.state.key}</p>
        <button onClick={() => this.refreshComponent()}>Refresh</button>
      </div>
    );
  }
}