react  tab选项卡吸顶实现，直接上代码（代码有注释）

tsx代码

/* eslint-disable react-hooks/exhaustive-deps */
import React, { useEffect, useState } from "react";
import DocumentTitle from 'react-document-title'
import styles from './styles.module.less'// 双旦活动
const Holiday: React.FC<any> = () => {const tabList = [{label:'礼物榜单',value:0},{label:'圣诞活动',value:1},{label:'元旦活动',value:2}]const [active,setactive] = useState<number>(0)const [isFixed,setisFixed] = useState<boolean>(false)//获得页面向左、向上卷动的距离const getScroll = () => {return {left: window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft || 0,top: window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0};}useEffect(() => {const btnList = document.getElementById('btnList')const offsetTop = btnList?.offsetTop || 0  // offsetTop：元素到offsetParent顶部的距离（当前元素顶部距离最近父元素顶部的距离）window.onscroll = function() {if(getScroll().top >= offsetTop){  // 判断滚动高度是否大于等于 btnList的offsetTopsetisFixed(true)   // 用于判断是否给btnList动态设置style}else{setisFixed(false)}}}, [])return (<DocumentTitle title='双旦活动'><div className={styles.Holiday}><div className={styles.top}><div className={styles.btnList} id="btnList" style={isFixed ? { zIndex: "999",top: "0",position: "fixed", backgroundColor: "#fff" } : {}}>{tabList.map((item:any) => (<div onClick={()=> setactive(item.value)} key={item.value}className={active === item.value ? styles.acitve : ''}>{item.label}</div>))}</div></div><div className={styles.center}><div className={styles.centerBox}><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div><div>双旦活动</div></div></div></div></DocumentTitle>)
}
export default Holiday;

less代码

.Holiday {width: 100%;height: 100%;position: relative;display: flex;flex-direction: column;.top{width: 100vw;height: 590px;background: url('../../assets/toplistbg.png') no-repeat;background-size: 100%;position: relative;.btnList{width: 100vw;padding: 20px 37px;box-sizing: border-box;position: absolute;bottom: 28px;height: 120px;display: flex;justify-content: space-between;bottom: 20px;>div{&.acitve{background: rgba(1, 50, 82, 1);color: #fff;}width: 212px;height: 80px;background: rgba(1, 50, 82, 0.1);border-radius: 40px;font-size: 30px;color: #333;display: flex;align-items: center;justify-content: center;font-family: PingFangSC-Regular, PingFang SC;font-weight: 400;}}}.center{width: 100vw;padding: 24px;box-sizing: border-box;.centerBox{width: 100%;background: #044067;border-radius: 20px;box-sizing: border-box;padding: 30px 28px;>div{color: #fff;font-size: 30px;text-align: center;line-height: 80px;}}}
}

效果展示