feat(docs): enhance frontend engineering content and component styling

- Register frontend engineering demo components in theme index
- Update AssetFingerprintDemo Vue imports and cleanup
- Revise "finding great idea" content from numbered list to prose format
- Expand web basics appendix with ECMAScript and TypeScript explanations
- Improve SummaryCard component styling with enhanced gradients and spacing
- Simplify BuildPipelineDemo and DependencyGraphDemo components for clarity
This commit is contained in:
sanbuphy
2026-02-13 00:36:06 +08:00
parent 36d7919da6
commit 0d12dacf8c
8 changed files with 754 additions and 1958 deletions
@@ -1,840 +1,130 @@
<!--
DependencyGraphDemo.vue
依赖图谱可视化演示
用途
展示前端项目的依赖关系图帮助理解模块如何相互引用
交互功能
- 图谱可视化以力导向图展示模块依赖关系
- 节点交互悬停/点击节点查看详情
- 路径追踪高亮显示两个模块间的依赖路径
- 布局切换切换不同的图谱布局方式
-->
<template>
<div class="dependency-graph-demo">
<div class="control-panel">
<div class="title-section">
<span class="icon">🕸</span>
<span class="title">依赖图谱</span>
<span class="subtitle">模块依赖关系可视化</span>
</div>
<div class="controls">
<div class="layout-control">
<label>布局:</label>
<select v-model="currentLayout">
<option value="force">力导向图</option>
<option value="circular">环形布局</option>
<option value="hierarchical">层次布局</option>
</select>
</div>
<button class="control-btn" @click="resetGraph">
重置视图
</button>
<button class="control-btn outline" @click="toggleAnimation">
{{ isAnimating ? ' 暂停' : ' 动画' }}
</button>
</div>
<div class="demo-header">
<span class="icon">🕸</span>
<span class="title">依赖图谱</span>
<span class="subtitle">模块依赖关系可视化</span>
</div>
<div class="graph-container" ref="graphContainer">
<svg
class="graph-svg"
:viewBox="`0 0 ${width} ${height}`"
@wheel.prevent="handleZoom"
@mousedown="startDrag"
@mousemove="handleDrag"
@mouseup="endDrag"
@mouseleave="endDrag"
>
<!-- 网格背景 -->
<div class="graph-container">
<svg class="graph-svg" viewBox="0 0 500 300">
<defs>
<pattern
id="grid"
width="40"
height="40"
patternUnits="userSpaceOnUse"
>
<path
d="M 40 0 L 0 0 0 40"
fill="none"
stroke="var(--vp-c-divider)"
stroke-width="0.5"
/>
</pattern>
<!-- 箭头标记 -->
<marker
id="arrowhead"
markerWidth="10"
markerHeight="7"
refX="20"
refY="3.5"
orient="auto"
>
<polygon
points="0 0, 10 3.5, 0 7"
fill="var(--vp-c-text-3)"
/>
</marker>
<!-- 高亮箭头 -->
<marker
id="arrowhead-highlight"
markerWidth="10"
markerHeight="7"
refX="20"
refY="3.5"
orient="auto"
>
<polygon
points="0 0, 10 3.5, 0 7"
fill="var(--vp-c-brand)"
/>
<marker id="arrow" markerWidth="8" markerHeight="6" refX="18" refY="3" orient="auto">
<polygon points="0 0, 8 3, 0 6" fill="var(--vp-c-text-3)" />
</marker>
</defs>
<rect width="100%" height="100%" fill="url(#grid)" />
<line v-for="edge in edges" :key="edge.id"
:x1="getNode(edge.source).x" :y1="getNode(edge.source).y"
:x2="getNode(edge.target).x" :y2="getNode(edge.target).y"
stroke="var(--vp-c-text-3)" stroke-width="1.5" marker-end="url(#arrow)"
/>
<!-- 连线 -->
<g class="edges">
<line
v-for="edge in edges"
:key="`${edge.source}-${edge.target}`"
:x1="getNode(edge.source).x"
:y1="getNode(edge.source).y"
:x2="getNode(edge.target).x"
:y2="getNode(edge.target).y"
:stroke="edge.highlighted ? 'var(--vp-c-brand)' : 'var(--vp-c-text-3)'"
:stroke-width="edge.highlighted ? 3 : 1.5"
:marker-end="edge.highlighted ? 'url(#arrowhead-highlight)' : 'url(#arrowhead)'"
class="edge-line"
/>
</g>
<!-- 节点 -->
<g class="nodes">
<g
v-for="node in nodes"
:key="node.id"
:transform="`translate(${node.x}, ${node.y})`"
class="node"
:class="{
selected: selectedNode === node.id,
highlighted: node.highlighted,
entry: node.type === 'entry'
}"
@mouseenter="highlightNode(node.id)"
@mouseleave="unhighlightNode"
@click="selectNode(node.id)"
>
<!-- 节点外圈 -->
<circle
:r="node.size + 4"
:fill="node.color"
opacity="0.2"
class="node-glow"
/>
<!-- 节点主体 -->
<circle
:r="node.size"
:fill="node.color"
stroke="white"
stroke-width="2"
class="node-circle"
/>
<!-- 节点图标 -->
<text
y="4"
text-anchor="middle"
fill="white"
font-size="14"
class="node-icon"
>
{{ node.icon }}
</text>
<!-- 节点标签 -->
<text
:y="node.size + 18"
text-anchor="middle"
:fill="selectedNode === node.id ? 'var(--vp-c-brand)' : 'var(--vp-c-text-1)'"
font-size="11"
font-weight="500"
class="node-label"
>
{{ node.name }}
</text>
</g>
<g v-for="node in nodes" :key="node.id" :transform="`translate(${node.x}, ${node.y})`">
<circle :r="node.r" :fill="node.color" stroke="white" stroke-width="2" />
<text y="4" text-anchor="middle" fill="white" font-size="12">{{ node.icon }}</text>
<text :y="node.r + 14" text-anchor="middle" fill="var(--vp-c-text-1)" font-size="10">{{ node.name }}</text>
</g>
</svg>
<!-- 缩放控制 -->
<div class="zoom-controls">
<button class="zoom-btn" @click="zoomIn">+</button>
<span class="zoom-level">{{ Math.round(zoom * 100) }}%</span>
<button class="zoom-btn" @click="zoomOut">-</button>
</div>
</div>
<!-- 节点详情面板 -->
<div v-if="selectedNodeData" class="node-details">
<div class="detail-header">
<span
class="detail-icon"
:style="{ background: selectedNodeData.color }"
>{{ selectedNodeData.icon }}</span>
<div class="detail-title-wrap">
<span class="detail-title">{{ selectedNodeData.name }}</span>
<span class="detail-type">{{ selectedNodeData.type === 'entry' ? '入口文件' : '模块' }}</span>
</div>
<button class="close-btn" @click="selectedNode = null">×</button>
</div>
<div class="detail-content">
<div class="detail-section">
<h4>📦 依赖信息</h4>
<div class="deps-info">
<div class="deps-count">
<span class="count-label">引入:</span>
<span class="count-value">{{ selectedNodeData.dependencies?.length || 0 }} 个模块</span>
</div>
<div class="deps-count">
<span class="count-label">被引用:</span>
<span class="count-value">{{ getIncomingDeps(selectedNodeData.id).length }} 个模块</span>
</div>
</div>
</div>
<div class="detail-section" v-if="selectedNodeData.dependencies?.length">
<h4>🔗 引用的模块</h4>
<div class="deps-list">
<span
v-for="depId in selectedNodeData.dependencies"
:key="depId"
class="dep-tag"
:style="{ background: getNode(depId)?.color || 'var(--vp-c-brand)' }"
@click="selectNode(depId)"
>
{{ getNode(depId)?.name || depId }}
</span>
</div>
</div>
<div class="detail-section">
<h4>📊 模块大小</h4>
<div class="size-bar">
<div
class="size-fill"
:style="{
width: `${Math.min((selectedNodeData.size || 0) / 10, 100)}%`,
background: selectedNodeData.color
}"
></div>
<span class="size-text">{{ selectedNodeData.size || 0 }} KB</span>
</div>
</div>
</div>
<div class="legend">
<div class="legend-item"><span class="dot entry"></span>入口文件</div>
<div class="legend-item"><span class="dot module"></span>模块</div>
<div class="legend-item"><span class="arrow"></span>依赖关系</div>
</div>
<div class="info-box">
<p>
<span class="icon">💡</span>
<strong>依赖图谱的作用</strong>
就像地图一样依赖图谱帮助你理解项目中的模块是如何相互关联的
你可以快速找到某个模块被哪些地方引用或者发现循环依赖等问题
在大型项目中良好的依赖结构是维护性的关键
</p>
<span class="icon">💡</span>
<strong>依赖图谱的作用</strong>就像地图一样帮助你理解模块之间是如何相互引用的main.js 引用了 utilscomponentsapi components 又引用了 utils这就是依赖链
</div>
</div>
</template>
<script setup>
import { ref, computed, onMounted, onUnmounted } from 'vue'
import { ref } from 'vue'
const width = 600
const height = 400
const currentView = ref('radar')
const highlightedTool = ref(null)
const selectedNode = ref(null)
const zoom = ref(1)
const isDragging = ref(false)
const dragStart = ref({ x: 0, y: 0 })
const panOffset = ref({ x: 0, y: 0 })
const currentLayout = ref('force')
const isAnimating = ref(true)
// 模拟项目依赖数据
const nodes = ref([
{ id: 'main', name: 'main.js', type: 'entry', size: 5, icon: '🚀', color: '#646cff', x: 300, y: 200, dependencies: ['utils', 'components', 'api'] },
{ id: 'utils', name: 'utils.js', type: 'module', size: 12, icon: '🛠️', color: '#ff6b6b', x: 150, y: 100, dependencies: ['helpers'] },
{ id: 'components', name: 'components/', type: 'module', size: 45, icon: '🧩', color: '#4ecdc4', x: 450, y: 120, dependencies: ['utils', 'hooks'] },
{ id: 'api', name: 'api.js', type: 'module', size: 8, icon: '🔌', color: '#ffe66d', x: 200, y: 300, dependencies: ['config'] },
{ id: 'helpers', name: 'helpers.js', type: 'module', size: 6, icon: '🔧', color: '#a8e6cf', x: 80, y: 50, dependencies: [] },
{ id: 'hooks', name: 'hooks.js', type: 'module', size: 15, icon: '', color: '#ff8b94', x: 520, y: 200, dependencies: ['utils'] },
{ id: 'config', name: 'config.js', type: 'module', size: 3, icon: '⚙️', color: '#c7ceea', x: 120, y: 350, dependencies: [] }
{ id: 'main', name: 'main.js', icon: '🚀', color: '#646cff', r: 22, x: 250, y: 60 },
{ id: 'utils', name: 'utils.js', icon: '🛠️', color: '#ff6b6b', r: 18, x: 100, y: 150 },
{ id: 'components', name: 'components/', icon: '🧩', color: '#4ecdc4', r: 20, x: 250, y: 150 },
{ id: 'api', name: 'api.js', icon: '🔌', color: '#ffe66d', r: 18, x: 400, y: 150 },
{ id: 'hooks', name: 'hooks.js', icon: '', color: '#ff8b94', r: 16, x: 180, y: 240 },
{ id: 'config', name: 'config.js', icon: '⚙️', color: '#c7ceea', r: 14, x: 320, y: 240 }
])
const edges = computed(() => {
const edgeList = []
nodes.value.forEach(node => {
if (node.dependencies) {
node.dependencies.forEach(depId => {
edgeList.push({
source: node.id,
target: depId,
highlighted: false
})
})
}
})
return edgeList
})
const selectedNodeData = computed(() => {
if (!selectedNode.value) return null
return nodes.value.find(n => n.id === selectedNode.value)
})
const edges = ref([
{ id: 1, source: 'main', target: 'utils' },
{ id: 2, source: 'main', target: 'components' },
{ id: 3, source: 'main', target: 'api' },
{ id: 4, source: 'components', target: 'utils' },
{ id: 5, source: 'components', target: 'hooks' },
{ id: 6, source: 'api', target: 'config' }
])
const getNode = (id) => nodes.value.find(n => n.id === id)
const getIncomingDeps = (nodeId) => {
return nodes.value.filter(n => n.dependencies?.includes(nodeId))
}
const selectNode = (id) => {
selectedNode.value = id
// 高亮相关边
edges.value.forEach(edge => {
edge.highlighted = edge.source === id || edge.target === id
})
}
const highlightNode = (id) => {
// 悬停效果
}
const unhighlightNode = () => {
// 清除悬停效果
}
const zoomIn = () => {
zoom.value = Math.min(zoom.value * 1.2, 3)
}
const zoomOut = () => {
zoom.value = Math.max(zoom.value / 1.2, 0.3)
}
const handleZoom = (e) => {
const delta = e.deltaY > 0 ? 0.9 : 1.1
zoom.value = Math.max(0.3, Math.min(3, zoom.value * delta))
}
const startDrag = (e) => {
isDragging.value = true
dragStart.value = { x: e.clientX - panOffset.value.x, y: e.clientY - panOffset.value.y }
}
const handleDrag = (e) => {
if (!isDragging.value) return
panOffset.value = {
x: e.clientX - dragStart.value.x,
y: e.clientY - dragStart.value.y
}
}
const endDrag = () => {
isDragging.value = false
}
const resetGraph = () => {
zoom.value = 1
panOffset.value = { x: 0, y: 0 }
selectedNode.value = null
// 重置节点位置
nodes.value.forEach((node, i) => {
const angle = (i / nodes.value.length) * 2 * Math.PI
node.x = 300 + 150 * Math.cos(angle)
node.y = 200 + 100 * Math.sin(angle)
})
}
const toggleAnimation = () => {
isAnimating.value = !isAnimating.value
}
const toggleScenario = (id) => {
expandedScenario.value = expandedScenario.value === id ? null : id
}
// 简化的力导向布局模拟
let animationFrame
const simulateForceLayout = () => {
if (!isAnimating.value) return
const centerX = width / 2
const centerY = height / 2
const k = 50 // 弹簧常数
const repulsion = 500 // 斥力
nodes.value.forEach((node, i) => {
let fx = 0, fy = 0
// 向中心的引力
fx += (centerX - node.x) * 0.01
fy += (centerY - node.y) * 0.01
// 节点间的斥力
nodes.value.forEach((other, j) => {
if (i === j) return
const dx = node.x - other.x
const dy = node.y - other.y
const dist = Math.sqrt(dx * dx + dy * dy) || 1
const force = repulsion / (dist * dist)
fx += (dx / dist) * force
fy += (dy / dist) * force
})
// 依赖的弹簧力
if (node.dependencies) {
node.dependencies.forEach(depId => {
const target = nodes.value.find(n => n.id === depId)
if (target) {
const dx = target.x - node.x
const dy = target.y - node.y
const dist = Math.sqrt(dx * dx + dy * dy) || 1
const force = (dist - k) * 0.01
fx += (dx / dist) * force
fy += (dy / dist) * force
}
})
}
// 应用力
node.x += fx * 0.1
node.y += fy * 0.1
// 边界限制
node.x = Math.max(30, Math.min(width - 30, node.x))
node.y = Math.max(30, Math.min(height - 30, node.y))
})
animationFrame = requestAnimationFrame(simulateForceLayout)
}
onMounted(() => {
simulateForceLayout()
})
onUnmounted(() => {
if (animationFrame) {
cancelAnimationFrame(animationFrame)
}
})
// 场景推荐数据
const expandedScenario = ref(null)
const scenarios = [
{
id: 'spa',
icon: '🚀',
name: '中小型 SPA 项目',
shortDesc: '单页应用,快速开发',
bestChoice: 'vite',
bestReason: 'Vite 的极速冷启动和热更新让开发体验极佳,配置简单,是中小型项目的首选。',
alternative: 'webpack',
altReason: '如果需要大量自定义配置或依赖特定的 webpack loaderwebpack 仍然是可靠的选择。'
},
{
id: 'library',
icon: '📚',
name: 'JavaScript 库/组件库',
shortDesc: '打包发布 npm 包',
bestChoice: 'rollup',
bestReason: 'Rollup 生成的代码最干净,Tree Shaking 效果最好,非常适合打包 JavaScript 库。',
alternative: 'vite',
altReason: 'Vite 使用 Rollup 进行生产构建,同时提供更好的开发体验,也是现代库开发的好选择。'
},
{
id: 'enterprise',
icon: '🏢',
name: '大型企业级应用',
shortDesc: '复杂业务,多人协作',
bestChoice: 'webpack',
bestReason: 'Webpack 生态最成熟,loader 和 plugin 最丰富,能应对各种复杂场景和定制化需求。',
alternative: 'vite',
altReason: '如果团队追求更好的开发体验,且项目不需要太多自定义构建逻辑,Vite 也是值得考虑的选项。'
},
{
id: 'ssg',
icon: '📝',
name: '静态站点生成 (SSG)',
shortDesc: '文档站、博客、营销页',
bestChoice: 'vite',
bestReason: 'VitePress、Astro 等现代 SSG 工具都基于 Vite,开发体验好,构建速度快。',
alternative: 'rollup',
altReason: '一些轻量级 SSG 工具直接使用 Rollup,如果对产物体积要求极高可以考虑。'
}
]
const getTool = (id) => bundlers.find(b => b.id === id)
// 简化的布局切换
watch(currentLayout, (newLayout) => {
// 重置节点位置以演示不同布局
nodes.value.forEach((node, i) => {
if (newLayout === 'circular') {
const angle = (i / nodes.value.length) * 2 * Math.PI
node.x = 300 + 150 * Math.cos(angle)
node.y = 200 + 120 * Math.sin(angle)
} else if (newLayout === 'hierarchical') {
const level = node.type === 'entry' ? 0 : node.dependencies?.length > 2 ? 1 : 2
const siblings = nodes.value.filter(n => {
const nl = n.type === 'entry' ? 0 : n.dependencies?.length > 2 ? 1 : 2
return nl === level
})
const index = siblings.indexOf(node)
const total = siblings.length
node.x = 100 + (index + 1) * (400 / (total + 1))
node.y = 80 + level * 120
}
})
})
</script>
<style scoped>
.dependency-graph-demo {
border: 1px solid var(--vp-c-divider);
border-radius: 8px;
background-color: var(--vp-c-bg-soft);
background: var(--vp-c-bg-soft);
padding: 1rem;
margin: 1rem 0;
font-family: var(--vp-font-family-mono);
}
.control-panel {
display: flex;
flex-wrap: wrap;
justify-content: space-between;
align-items: center;
margin-bottom: 1rem;
background: var(--vp-c-bg);
padding: 0.75rem;
border-radius: 6px;
border: 1px solid var(--vp-c-divider);
gap: 1rem;
}
.title-section {
.demo-header {
display: flex;
align-items: center;
gap: 0.5rem;
margin-bottom: 1rem;
}
.title-section .icon {
font-size: 1.5rem;
}
.title-section .title {
font-weight: bold;
font-size: 1.1rem;
}
.title-section .subtitle {
color: var(--vp-c-text-2);
font-size: 0.85rem;
margin-left: 0.5rem;
}
.controls {
display: flex;
align-items: center;
gap: 0.75rem;
flex-wrap: wrap;
}
.layout-control {
display: flex;
align-items: center;
gap: 0.3rem;
font-size: 0.85rem;
}
.layout-control select {
padding: 0.25rem 0.5rem;
border-radius: 4px;
border: 1px solid var(--vp-c-divider);
background: var(--vp-c-bg);
font-size: 0.85rem;
}
.control-btn {
padding: 0.35rem 0.75rem;
border-radius: 4px;
background-color: var(--vp-c-brand);
color: white;
font-size: 0.8rem;
border: none;
cursor: pointer;
transition: opacity 0.2s;
}
.control-btn.outline {
background-color: transparent;
border: 1px solid var(--vp-c-divider);
color: var(--vp-c-text-1);
}
.control-btn:hover {
opacity: 0.85;
}
.demo-header .icon { font-size: 1.25rem; }
.demo-header .title { font-weight: bold; font-size: 1rem; }
.demo-header .subtitle { color: var(--vp-c-text-2); font-size: 0.85rem; margin-left: 0.5rem; }
.graph-container {
position: relative;
background: var(--vp-c-bg);
border-radius: 8px;
border-radius: 6px;
border: 1px solid var(--vp-c-divider);
height: 400px;
overflow: hidden;
}
.graph-svg {
width: 100%;
height: 100%;
cursor: grab;
height: auto;
}
.graph-svg:active {
cursor: grabbing;
}
.edge-line {
transition: all 0.3s ease;
}
.node {
cursor: pointer;
transition: all 0.3s ease;
}
.node:hover {
transform: scale(1.1);
}
.node.selected .node-circle {
stroke: var(--vp-c-brand);
stroke-width: 4;
}
.node.highlighted .node-glow {
opacity: 0.5;
}
.node-glow {
transition: opacity 0.3s ease;
}
.zoom-controls {
position: absolute;
bottom: 10px;
right: 10px;
.legend {
display: flex;
align-items: center;
gap: 0.25rem;
background: var(--vp-c-bg);
border-radius: 4px;
padding: 0.25rem;
border: 1px solid var(--vp-c-divider);
}
.zoom-btn {
width: 24px;
height: 24px;
display: flex;
align-items: center;
justify-content: center;
border: none;
background: var(--vp-c-bg-soft);
border-radius: 3px;
cursor: pointer;
font-size: 14px;
color: var(--vp-c-text-1);
}
.zoom-btn:hover {
background: var(--vp-c-bg-alt);
}
.zoom-level {
font-size: 0.75rem;
color: var(--vp-c-text-2);
min-width: 40px;
text-align: center;
}
.node-details {
background: var(--vp-c-bg);
border-radius: 8px;
padding: 1rem;
border: 1px solid var(--vp-c-divider);
margin-bottom: 1rem;
}
.detail-header {
display: flex;
align-items: center;
gap: 0.75rem;
margin-bottom: 0.75rem;
padding-bottom: 0.5rem;
border-bottom: 1px solid var(--vp-c-divider);
}
.detail-icon {
width: 36px;
height: 36px;
border-radius: 8px;
display: flex;
align-items: center;
justify-content: center;
font-size: 1.25rem;
}
.detail-title-wrap {
flex: 1;
display: flex;
flex-direction: column;
}
.detail-title {
font-weight: bold;
font-size: 1rem;
}
.detail-type {
font-size: 0.75rem;
gap: 1.5rem;
margin-top: 0.75rem;
font-size: 0.8rem;
color: var(--vp-c-text-2);
}
.close-btn {
width: 24px;
height: 24px;
display: flex;
align-items: center;
justify-content: center;
border: none;
background: transparent;
color: var(--vp-c-text-3);
font-size: 1.25rem;
cursor: pointer;
border-radius: 4px;
.legend-item { display: flex; align-items: center; gap: 0.3rem; }
.dot {
width: 10px;
height: 10px;
border-radius: 50%;
}
.close-btn:hover {
background: var(--vp-c-bg-soft);
color: var(--vp-c-text-1);
}
.detail-content {
display: grid;
gap: 0.75rem;
}
.detail-section h4 {
font-size: 0.85rem;
margin-bottom: 0.4rem;
color: var(--vp-c-text-1);
}
.deps-info {
display: flex;
gap: 1rem;
}
.deps-count {
display: flex;
flex-direction: column;
}
.count-label {
font-size: 0.75rem;
color: var(--vp-c-text-3);
}
.count-value {
font-size: 0.9rem;
font-weight: 500;
color: var(--vp-c-text-1);
}
.deps-list {
display: flex;
flex-wrap: wrap;
gap: 0.4rem;
}
.dep-tag {
padding: 0.2rem 0.5rem;
border-radius: 4px;
color: white;
font-size: 0.75rem;
cursor: pointer;
transition: opacity 0.2s;
}
.dep-tag:hover {
opacity: 0.85;
}
.size-bar {
display: flex;
align-items: center;
gap: 0.5rem;
background: var(--vp-c-bg-soft);
border-radius: 4px;
padding: 0.25rem;
}
.size-fill {
height: 8px;
border-radius: 4px;
transition: width 0.3s ease;
min-width: 4px;
}
.size-text {
font-size: 0.75rem;
color: var(--vp-c-text-2);
min-width: 50px;
}
.dot.entry { background: #646cff; }
.dot.module { background: #4ecdc4; }
.arrow { color: var(--vp-c-text-3); }
.info-box {
background-color: var(--vp-c-bg-alt);
background: var(--vp-c-bg-alt);
padding: 0.75rem;
border-radius: 6px;
font-size: 0.85rem;
line-height: 1.4;
color: var(--vp-c-text-2);
margin-top: 0.75rem;
}
.info-box .icon {
margin-right: 0.5rem;
}
@media (max-width: 768px) {
.radar-view {
grid-template-columns: 1fr;
}
.control-panel {
flex-direction: column;
align-items: flex-start;
}
}
.info-box .icon { margin-right: 0.25rem; }
</style>