sanbuphy
d35211071a
- standardize border-radius from 8px to 6px for consistent styling - adjust padding values from 1rem to 0.75rem for better visual hierarchy - remove redundant overflow-y properties for cleaner code
533 lines
12 KiB
Vue
533 lines
12 KiB
Vue
<!--
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CodeSplittingDemo.vue
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代码分割演示
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用途：
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展示如何通过代码分割实现按需加载，优化首屏性能。
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-->
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<template>
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<div class="code-splitting-demo">
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<div class="demo-header">
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<h3>✂️ 代码分割演示</h3>
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<p>按需加载，提升首屏速度</p>
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</div>
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<div class="demo-content">
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<!-- 左侧：路由配置 -->
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<div class="routes-panel">
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<div class="panel-title">🚦 路由配置</div>
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<div class="routes-list">
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<div
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v-for="route in routes"
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:key="route.path"
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class="route-item"
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:class="{ active: currentRoute === route.path, loaded: route.loaded }"
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@click="navigateTo(route)"
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>
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<div class="route-info">
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<div class="route-path">{{ route.path }}</div>
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<div class="route-name">{{ route.name }}</div>
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</div>
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<div class="route-load-info">
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<span v-if="route.loading" class="loading-badge">加载中...</span>
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<span v-else-if="route.loaded" class="loaded-badge">已缓存</span>
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<span v-else class="lazy-badge">按需加载</span>
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</div>
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<div class="route-size">
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{{ formatSize(route.size) }}
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</div>
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</div>
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</div>
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</div>
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<!-- 右侧：加载可视化 -->
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<div class="load-panel">
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<div class="panel-title">📊 加载分析</div>
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<div class="load-visualization">
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<!-- 初始加载 -->
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<div class="load-section">
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<div class="section-header">
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<span class="section-icon">🚀</span>
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<span class="section-title">首屏加载</span>
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<span class="section-size">{{ formatSize(initialLoadSize) }}</span>
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</div>
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<div class="chunk-list">
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<div
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v-for="chunk in initialChunks"
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:key="chunk.name"
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class="chunk-item initial"
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:style="{ width: getChunkWidth(chunk.size) }"
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>
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<span class="chunk-name">{{ chunk.name }}</span>
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<span class="chunk-size">{{ formatSize(chunk.size) }}</span>
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</div>
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</div>
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</div>
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<!-- 按需加载 -->
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<div class="load-section">
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<div class="section-header">
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<span class="section-icon">📦</span>
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<span class="section-title">按需加载 (Lazy Loading)</span>
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<span class="section-size">{{ formatSize(lazyLoadSize) }}</span>
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</div>
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<div class="chunk-list">
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<div
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v-for="chunk in lazyChunks"
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:key="chunk.name"
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class="chunk-item lazy"
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:class="{ loaded: chunk.loaded }"
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:style="{ width: getChunkWidth(chunk.size) }"
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@click="loadChunk(chunk)"
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>
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<span class="chunk-status">{{ chunk.loaded ? '✓' : '○' }}</span>
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<span class="chunk-name">{{ chunk.name }}</span>
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<span class="chunk-size">{{ formatSize(chunk.size) }}</span>
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</div>
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</div>
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<p class="lazy-tip">💡 点击上方模块可模拟按需加载</p>
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</div>
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<!-- 优化效果 -->
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<div class="optimization-summary">
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<div class="summary-item">
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<span class="summary-label">未优化总大小</span>
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<span class="summary-value original">{{ formatSize(totalSize) }}</span>
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</div>
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<div class="summary-arrow">→</div>
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<div class="summary-item">
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<span class="summary-label">首屏加载</span>
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<span class="summary-value optimized">{{ formatSize(initialLoadSize) }}</span>
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</div>
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<div class="summary-item savings">
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<span class="summary-label">节省</span>
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<span class="summary-value">{{ savingsPercent }}%</span>
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</div>
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</div>
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</div>
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</div>
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</div>
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<div class="info-box">
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<p>
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<span class="icon">💡</span>
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<strong>代码分割的核心思想：</strong>
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不是所有代码都需要在首屏加载。通过动态导入 `import()`，
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我们可以把非核心功能延迟到真正需要时再加载。
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这就像餐厅的点餐制——不是把所有菜一次性端上来，而是按需上菜。
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</p>
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</div>
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</div>
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</template>
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<script setup>
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import { ref, computed } from 'vue'
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// 模拟路由配置
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const routes = ref([
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{ path: '/', name: '首页', size: 45, loaded: true, loading: false },
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{ path: '/about', name: '关于我们', size: 28, loaded: false, loading: false },
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{ path: '/dashboard', name: '数据面板', size: 156, loaded: false, loading: false },
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{ path: '/settings', name: '系统设置', size: 89, loaded: false, loading: false },
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{ path: '/reports', name: '报表中心', size: 234, loaded: false, loading: false }
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])
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const currentRoute = ref('/')
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// 模拟代码块
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const initialChunks = ref([
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{ name: 'runtime', size: 3 },
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{ name: 'core', size: 42 }
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])
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const lazyChunks = ref([
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{ name: 'about.chunk', size: 28, loaded: false },
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{ name: 'dashboard.chunk', size: 156, loaded: false },
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{ name: 'settings.chunk', size: 89, loaded: false },
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{ name: 'reports.chunk', size: 234, loaded: false }
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])
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// 计算属性
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const initialLoadSize = computed(() =>
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initialChunks.value.reduce((sum, c) => sum + c.size, 0)
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)
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const lazyLoadSize = computed(() =>
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lazyChunks.value.reduce((sum, c) => sum + c.size, 0)
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)
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const totalSize = computed(() => initialLoadSize.value + lazyLoadSize.value)
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const savingsPercent = computed(() => {
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const saved = totalSize.value - initialLoadSize.value
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return Math.round((saved / totalSize.value) * 100)
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})
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// 方法
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const formatSize = (size) => {
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if (size > 1024) return (size / 1024).toFixed(1) + ' MB'
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return size + ' KB'
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}
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const getChunkWidth = (size) => {
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const maxSize = Math.max(...initialChunks.value.map(c => c.size), ...lazyChunks.value.map(c => c.size))
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const percent = (size / maxSize) * 100
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return `${Math.max(percent, 20)}%`
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}
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const navigateTo = (route) => {
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currentRoute.value = route.path
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if (!route.loaded && !route.loading) {
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route.loading = true
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// 模拟加载延迟
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setTimeout(() => {
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route.loaded = true
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route.loading = false
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// 同步更新 chunk 状态
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const chunkName = route.path.slice(1) || 'index'
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const chunk = lazyChunks.value.find(c => c.name.includes(chunkName))
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if (chunk) chunk.loaded = true
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}, 800)
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}
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}
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const loadChunk = (chunk) => {
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if (chunk.loaded) return
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chunk.loaded = true
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}
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const selectFile = (file) => {
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// 简化处理
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}
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</script>
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<style scoped>
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.code-splitting-demo {
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border: 1px solid var(--vp-c-divider);
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border-radius: 6px;
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background-color: var(--vp-c-bg-soft);
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padding: 0.75rem;
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margin: 0.5rem 0;
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font-family: var(--vp-font-family-mono);
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}
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.demo-header h3 {
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margin: 0 0 0.5rem 0;
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font-size: 1.1rem;
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}
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.demo-header p {
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margin: 0;
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color: var(--vp-c-text-2);
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font-size: 0.9rem;
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}
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.demo-content {
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display: grid;
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grid-template-columns: 1fr 1fr;
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gap: 1rem;
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margin: 0.5rem 0;
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}
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@media (max-width: 768px) {
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.demo-content {
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grid-template-columns: 1fr;
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}
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}
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.routes-panel,
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.load-panel {
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background: var(--vp-c-bg);
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border-radius: 6px;
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border: 1px solid var(--vp-c-divider);
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overflow: hidden;
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}
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.panel-title {
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background: var(--vp-c-bg-soft);
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padding: 0.5rem 0.75rem;
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font-size: 0.85rem;
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font-weight: 600;
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border-bottom: 1px solid var(--vp-c-divider);
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}
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.routes-list {
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max-height: 280px;
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}
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.route-item {
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display: flex;
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align-items: center;
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gap: 0.75rem;
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padding: 0.6rem 0.75rem;
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border-bottom: 1px solid var(--vp-c-divider);
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cursor: pointer;
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transition: all 0.2s;
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}
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.route-item:last-child {
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border-bottom: none;
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}
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.route-item:hover {
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background: var(--vp-c-bg-soft);
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}
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.route-item.active {
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background: rgba(100, 108, 255, 0.1);
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border-left: 3px solid #646cff;
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}
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.route-item.loaded .route-path {
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color: #22c55e;
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}
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.route-info {
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flex: 1;
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min-width: 0;
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}
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.route-path {
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font-family: monospace;
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font-size: 0.85rem;
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color: var(--vp-c-text-1);
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font-weight: 500;
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}
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.route-name {
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font-size: 0.75rem;
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color: var(--vp-c-text-2);
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}
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.route-load-info {
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display: flex;
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align-items: center;
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}
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.loading-badge,
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.loaded-badge,
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.lazy-badge {
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font-size: 0.7rem;
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padding: 0.15rem 0.4rem;
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border-radius: 3px;
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white-space: nowrap;
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}
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.loading-badge {
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background: #3b82f6;
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color: white;
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animation: pulse 1.5s infinite;
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}
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.loaded-badge {
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background: #22c55e;
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color: white;
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}
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.lazy-badge {
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background: var(--vp-c-bg-soft);
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color: var(--vp-c-text-2);
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border: 1px solid var(--vp-c-divider);
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}
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@keyframes pulse {
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0%, 100% { opacity: 1; }
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50% { opacity: 0.6; }
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}
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.route-size {
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font-size: 0.75rem;
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color: var(--vp-c-text-3);
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font-family: monospace;
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min-width: 50px;
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text-align: right;
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}
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.load-visualization {
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padding: 0.75rem;
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}
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.load-section {
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margin-bottom: 1.25rem;
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}
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.section-header {
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display: flex;
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align-items: center;
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gap: 0.5rem;
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margin-bottom: 0.5rem;
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}
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.section-icon {
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font-size: 1rem;
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}
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.section-title {
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flex: 1;
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font-weight: 500;
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font-size: 0.85rem;
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}
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.section-size {
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font-size: 0.8rem;
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color: var(--vp-c-text-2);
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font-family: monospace;
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}
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.chunk-list {
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display: flex;
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flex-direction: column;
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gap: 0.4rem;
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}
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.chunk-item {
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display: flex;
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align-items: center;
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gap: 0.5rem;
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padding: 0.4rem 0.6rem;
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border-radius: 4px;
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font-size: 0.8rem;
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transition: all 0.2s;
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}
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.chunk-item.initial {
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background: rgba(100, 108, 255, 0.15);
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border: 1px solid rgba(100, 108, 255, 0.3);
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}
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.chunk-item.lazy {
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background: var(--vp-c-bg-soft);
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border: 1px dashed var(--vp-c-divider);
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cursor: pointer;
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}
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.chunk-item.lazy:hover {
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background: var(--vp-c-bg-alt);
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}
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.chunk-item.lazy.loaded {
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background: rgba(34, 197, 94, 0.15);
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border: 1px solid rgba(34, 197, 94, 0.3);
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border-style: solid;
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}
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.chunk-status {
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font-size: 0.75rem;
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width: 16px;
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text-align: center;
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}
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.chunk-name {
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flex: 1;
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font-family: monospace;
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}
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.chunk-size {
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font-size: 0.7rem;
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color: var(--vp-c-text-2);
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}
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.lazy-tip {
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font-size: 0.75rem;
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color: var(--vp-c-text-2);
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margin: 0.5rem 0 0 0;
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font-style: italic;
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}
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.optimization-summary {
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margin-top: 1rem;
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padding-top: 1rem;
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border-top: 1px solid var(--vp-c-divider);
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}
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.optimization-summary h4 {
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font-size: 0.85rem;
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margin-bottom: 0.75rem;
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color: var(--vp-c-text-1);
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}
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.stats-grid {
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display: grid;
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grid-template-columns: repeat(4, 1fr);
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gap: 0.5rem;
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}
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.stat-item {
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text-align: center;
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padding: 0.6rem 0.4rem;
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background: var(--vp-c-bg-soft);
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border-radius: 6px;
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}
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.stat-value {
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font-size: 1.1rem;
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font-weight: bold;
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color: var(--vp-c-brand);
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}
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.stat-value.original {
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color: var(--vp-c-text-2);
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text-decoration: line-through;
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font-size: 0.9rem;
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}
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.stat-value.optimized {
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color: #22c55e;
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}
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.stat-value.savings {
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color: var(--vp-c-brand);
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}
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.stat-label {
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font-size: 0.65rem;
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color: var(--vp-c-text-2);
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margin-top: 0.2rem;
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}
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.info-box {
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background-color: var(--vp-c-bg-alt);
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padding: 0.75rem;
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border-radius: 6px;
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font-size: 0.85rem;
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line-height: 1.4;
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color: var(--vp-c-text-2);
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margin-top: 1rem;
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}
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.info-box .icon {
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margin-right: 0.5rem;
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}
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@media (max-width: 768px) {
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.demo-content {
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grid-template-columns: 1fr;
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}
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.stats-grid {
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grid-template-columns: repeat(2, 1fr);
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}
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.route-item {
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flex-wrap: wrap;
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}
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.route-size {
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width: 100%;
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text-align: left;
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margin-top: 0.25rem;
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}
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}
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</style>
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