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需求：SideBar 侧边导航与内容区域交互
- 点击侧边栏某一项时，相对应内容区域滚动到视口顶部
- 滚动视口区域，到某一项内容区域，侧边栏选中状态也会跟着变化
const SideBarAgain: React.FC<PopupProps> = (props) => {// 父组件传过来的值const { tabList } = propsconst mainElementRef = useRef<HTMLDivElement>(null)// 用来监听页面滚动事件const scroll = useScroll(mainElementRef);const mainElement = mainElementRef.currentconst state = useReactive({ activeKey: '1' });const handleScroll = (key?:string) => {// 滚动时，需要修改侧边栏选中状态// 过滤出元素顶部到视窗的距离大于0的元素const currentKey = tabList.filter((item: { key: string })=>{const element = document.getElementById(`anchor-${item.key}`)if (!element) returnconst rect = element.getBoundingClientRect()if (rect.top >= 0) {return item}})// 判断如果currentKey大于0，则选取第一个key值if(currentKey.length){state.activeKey = currentKey[0].key}else{state.activeKey = tabList[tabList.length-1].key}// 点击侧边栏传入的ID，并滚动到对应位置if(key){document.getElementById(`anchor-${key}`)?.scrollIntoView({behavior: "smooth"})state.activeKey = key}}useEffect(() => {if (!mainElement) returnmainElement.addEventListener('scroll', () => handleScroll)return () => {mainElement.removeEventListener('scroll', () => handleScroll)}}, [])// 利用scroll的变化监听handleScrolluseLayoutEffect(() => handleScroll,[scroll])return (<div className='sider'><SideBar activeKey={state.activeKey} onChange={(key)=>handleScroll(key)}>{tabList.map((item: { key: string, title: string }) => (<SideBar.Item key={item.key} title={item.title} />))}</SideBar><div className='main' ref={mainElementRef}>{tabList.map((item: { key: string; title: string; text: string}) => (<div key={item.key} id={`anchor-${item.key}`} ><h2>{item.title}</h2>{item.text}</div>))}</div></div>)
}export default SideBarAgain;