使用setState创建视差效果

import React, { Component } from 'react';

class ParallaxEffect extends Component {
  constructor(props) {
    super(props);
    this.state = {
      scrollPosition: 0,
    };
  }

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

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

  handleScroll = () => {
    const scrollPosition = window.pageYOffset;
    this.setState({ scrollPosition });
  };

  render() {
    const { scrollPosition } = this.state;

    // 根据滚动位置计算需要改变的属性值
    const parallaxOffset = scrollPosition * 0.5;

    return (
      <div>
        <div
          style={{
            transform: `translateY(${parallaxOffset}px)`,
          }}
        >
          {/* 视差效果的元素 */}
        </div>
        {/* 其他页面内容 */}
      </div>
    );
  }
}

export default ParallaxEffect;