import React, { Component } from 'react';

class AnotherComponent extends Component {
  constructor(props) {
    super(props);
    this.state = {
      isDivActive: false
    };
  }

  handleButtonClick = () => {
    this.setState(prevState => ({
      isDivActive: !prevState.isDivActive
    }));
  }

  render() {
    const { isDivActive } = this.state;
    const divClassName = isDivActive ? 'active' : 'inactive';

    return (
      <div>
        <button onClick={this.handleButtonClick}>切换div元素的类</button>
        <div className={divClassName}>这是一个div元素</div>
      </div>
    );
  }
}

export default AnotherComponent;