在React.js中将箭头函数转换为类

import React, { Component } from 'react';

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

  componentDidMount() {
    // 组件挂载后的逻辑
  }

  componentDidUpdate(prevProps, prevState) {
    // 组件更新后的逻辑
  }

  componentWillUnmount() {
    // 组件卸载前的逻辑
  }

  handleClick() {
    this.setState(prevState => ({
      count: prevState.count + 1
    }));
  }

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

export default MyComponent;