45 lines
1.1 KiB
TypeScript
45 lines
1.1 KiB
TypeScript
export default defineNuxtPlugin(() => {
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if (typeof window === 'undefined') return
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let observer: IntersectionObserver | null = null
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let headings: HTMLElement[] = []
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function initScrollSpy() {
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// 清理旧的 observer
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if (observer) observer.disconnect()
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// 收集所有带 id 的标题
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headings = Array.from(document.querySelectorAll('.prose h2[id], .prose h3[id]')) as HTMLElement[]
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if (headings.length === 0) return
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observer = new IntersectionObserver(
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(entries) => {
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for (const entry of entries) {
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if (entry.isIntersecting) {
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const id = entry.target.getAttribute('id')
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if (id) {
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history.replaceState(null, '', `#${id}`)
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}
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}
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}
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},
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{ rootMargin: '-80px 0px -70% 0px' }
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)
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headings.forEach(h => observer!.observe(h))
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}
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// 路由切换后重新初始化
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const router = useRouter()
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router.afterEach(() => {
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nextTick(() => {
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setTimeout(initScrollSpy, 100)
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})
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})
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// 首次加载
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onMounted(() => {
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setTimeout(initScrollSpy, 100)
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})
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})
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