|
| 1 | +<script setup lang="ts"> |
| 2 | +import { ref, onMounted, onUnmounted } from 'vue' |
| 3 | +
|
| 4 | +// 目录项类型 |
| 5 | +interface TocItem { |
| 6 | + level: number |
| 7 | + text: string |
| 8 | + link: string |
| 9 | + children?: TocItem[] |
| 10 | +} |
| 11 | +
|
| 12 | +const headers = ref<TocItem[]>([]) |
| 13 | +const activeId = ref('') |
| 14 | +
|
| 15 | +// 从页面中提取标题 |
| 16 | +function extractHeaders(): TocItem[] { |
| 17 | + if (typeof document === 'undefined') return [] |
| 18 | +
|
| 19 | + const article = document.querySelector('.vp-doc') || document.querySelector('.page') |
| 20 | + if (!article) return [] |
| 21 | +
|
| 22 | + const elements = article.querySelectorAll('h2, h3, h4') |
| 23 | + const result: TocItem[] = [] |
| 24 | +
|
| 25 | + elements.forEach((el) => { |
| 26 | + const id = el.id |
| 27 | + const level = parseInt(el.tagName[1]) |
| 28 | + const text = el.textContent?.replace(/#$/, '').trim() || '' |
| 29 | +
|
| 30 | + if (id && text) { |
| 31 | + result.push({ level, text, link: `#${id}` }) |
| 32 | + } |
| 33 | + }) |
| 34 | +
|
| 35 | + return result |
| 36 | +} |
| 37 | +
|
| 38 | +// 更新活动标题 |
| 39 | +function updateActiveHeader() { |
| 40 | + if (typeof document === 'undefined') return |
| 41 | +
|
| 42 | + const article = document.querySelector('.vp-doc') || document.querySelector('.page') |
| 43 | + if (!article) return |
| 44 | +
|
| 45 | + const elements = article.querySelectorAll('h2, h3, h4') |
| 46 | + let current = '' |
| 47 | +
|
| 48 | + elements.forEach((el) => { |
| 49 | + const rect = el.getBoundingClientRect() |
| 50 | + if (rect.top <= 100) { |
| 51 | + current = el.id |
| 52 | + } |
| 53 | + }) |
| 54 | +
|
| 55 | + if (current) { |
| 56 | + activeId.value = current |
| 57 | + } |
| 58 | +} |
| 59 | +
|
| 60 | +let observer: IntersectionObserver | null = null |
| 61 | +
|
| 62 | +onMounted(() => { |
| 63 | + headers.value = extractHeaders() |
| 64 | +
|
| 65 | + // 使用 IntersectionObserver 监听标题 |
| 66 | + if (typeof document !== 'undefined') { |
| 67 | + observer = new IntersectionObserver( |
| 68 | + (entries) => { |
| 69 | + entries.forEach((entry) => { |
| 70 | + if (entry.isIntersecting) { |
| 71 | + activeId.value = entry.target.id |
| 72 | + } |
| 73 | + }) |
| 74 | + }, |
| 75 | + { |
| 76 | + rootMargin: '-80px 0px -60% 0px', |
| 77 | + threshold: 0 |
| 78 | + } |
| 79 | + ) |
| 80 | +
|
| 81 | + const article = document.querySelector('.vp-doc') || document.querySelector('.page') |
| 82 | + if (article) { |
| 83 | + article.querySelectorAll('h2, h3, h4').forEach((el) => { |
| 84 | + observer?.observe(el) |
| 85 | + }) |
| 86 | + } |
| 87 | + } |
| 88 | +
|
| 89 | + window.addEventListener('scroll', updateActiveHeader) |
| 90 | +}) |
| 91 | +
|
| 92 | +onUnmounted(() => { |
| 93 | + observer?.disconnect() |
| 94 | + window.removeEventListener('scroll', updateActiveHeader) |
| 95 | +}) |
| 96 | +</script> |
| 97 | + |
| 98 | +<template> |
| 99 | + <aside v-if="headers.length > 0" class="toc"> |
| 100 | + <nav class="toc-nav"> |
| 101 | + <h2 class="toc-title">本页导航</h2> |
| 102 | + <ul class="toc-list"> |
| 103 | + <li |
| 104 | + v-for="header in headers" |
| 105 | + :key="header.link" |
| 106 | + class="toc-item" |
| 107 | + :class="[`level-${header.level}`, { active: activeId === header.link.slice(1) }]" |
| 108 | + > |
| 109 | + <a :href="header.link" class="toc-link"> |
| 110 | + {{ header.text }} |
| 111 | + </a> |
| 112 | + </li> |
| 113 | + </ul> |
| 114 | + </nav> |
| 115 | + </aside> |
| 116 | +</template> |
| 117 | + |
| 118 | +<style scoped> |
| 119 | +.toc { |
| 120 | + width: 240px; |
| 121 | + flex-shrink: 0; |
| 122 | + padding: 1.5rem 0; |
| 123 | + position: sticky; |
| 124 | + top: 4rem; |
| 125 | + height: calc(100vh - 4rem); |
| 126 | + overflow-y: auto; |
| 127 | +} |
| 128 | +
|
| 129 | +.toc-nav { |
| 130 | + padding: 0 1rem; |
| 131 | +} |
| 132 | +
|
| 133 | +.toc-title { |
| 134 | + font-size: 0.75rem; |
| 135 | + font-weight: 600; |
| 136 | + color: #9ca3af; |
| 137 | + text-transform: uppercase; |
| 138 | + letter-spacing: 0.05em; |
| 139 | + margin: 0 0 0.75rem 0; |
| 140 | +} |
| 141 | +
|
| 142 | +.toc-list { |
| 143 | + list-style: none; |
| 144 | + margin: 0; |
| 145 | + padding: 0; |
| 146 | + border-left: 1px solid #e5e7eb; |
| 147 | +} |
| 148 | +
|
| 149 | +.toc-item { |
| 150 | + margin: 0; |
| 151 | +} |
| 152 | +
|
| 153 | +.toc-item.level-2 { |
| 154 | + padding-left: 0.75rem; |
| 155 | +} |
| 156 | +
|
| 157 | +.toc-item.level-3 { |
| 158 | + padding-left: 1.5rem; |
| 159 | +} |
| 160 | +
|
| 161 | +.toc-item.level-4 { |
| 162 | + padding-left: 2.25rem; |
| 163 | +} |
| 164 | +
|
| 165 | +.toc-link { |
| 166 | + display: block; |
| 167 | + padding: 0.375rem 0; |
| 168 | + color: #6b7280; |
| 169 | + text-decoration: none; |
| 170 | + font-size: 0.8125rem; |
| 171 | + line-height: 1.5; |
| 172 | + transition: color 0.2s; |
| 173 | + border-left: 2px solid transparent; |
| 174 | + margin-left: -1px; |
| 175 | +} |
| 176 | +
|
| 177 | +.toc-link:hover { |
| 178 | + color: #3b82f6; |
| 179 | +} |
| 180 | +
|
| 181 | +.toc-item.active .toc-link { |
| 182 | + color: #3b82f6; |
| 183 | + font-weight: 500; |
| 184 | + border-left-color: #3b82f6; |
| 185 | +} |
| 186 | +
|
| 187 | +/* 移动端和平板隐藏 */ |
| 188 | +@media (max-width: 1280px) { |
| 189 | + .toc { |
| 190 | + display: none; |
| 191 | + } |
| 192 | +} |
| 193 | +</style> |
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