当用户滚动时在ReactJS组件上添加/删除类

import React, { Component } from 'react';

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

  componentDidMount() {
    window.addEventListener('scroll', this.handleScroll);
  }

  componentWillUnmount() {
    window.removeEventListener('scroll', this.handleScroll);
  }

  handleScroll = () => {
    const scrollTop = window.scrollY;
    if (scrollTop > 0) {
      this.setState({ isScrolled: true });
    } else {
      this.setState({ isScrolled: false });
    }
  }

  render() {
    const { isScrolled } = this.state;
    return (
      <div className={isScrolled ? 'scrolled' : ''}>
        {/* 组件内容 */}
      </div>
    );
  }
}

export default ScrollableComponent;