sanbuphy
ad95658a11
- Add NavGrid.vue and NavCard.vue components for better navigation layout - Restructure stage-0 index pages across languages into intro.md with new navigation components - Remove old stage-0 index.md files and update stage-3 pages similarly - Add new dependencies 'claude' and 'codex' to package.json - Improve code formatting in multiple Vue components for better readability - Update documentation content and structure for better user experience
523 lines
11 KiB
Vue
523 lines
11 KiB
Vue
<!--
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ReflowRepaintDemo.vue
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重排与重绘演示
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-->
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<template>
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<div class="reflow-demo">
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<div class="header">
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<div class="title">重排与重绘对比</div>
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<div class="subtitle">观察不同操作对性能的影响</div>
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</div>
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<div class="demo-container">
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<div class="canvas-area">
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<div class="box-container">
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<div
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v-for="box in boxes"
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:key="box.id"
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class="box"
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:class="box.selected ? 'selected' : ''"
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:style="getBoxStyle(box)"
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@click="selectBox(box.id)"
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>
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{{ box.id }}
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</div>
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</div>
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<div class="performance-meter">
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<div class="meter-label">性能影响</div>
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<div class="meter-bar">
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<div
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class="meter-fill"
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:class="performanceLevel.class"
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:style="{ width: performanceImpact + '%' }"
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></div>
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</div>
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<div class="meter-value" :class="performanceLevel.class">
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{{ performanceLevel.text }}
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</div>
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</div>
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<div class="stats">
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<div class="stat-item">
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<div class="stat-label">操作类型</div>
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<div class="stat-value">{{ currentOperation }}</div>
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</div>
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<div class="stat-item">
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<div class="stat-label">影响范围</div>
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<div class="stat-value">{{ affectedElements }} 个元素</div>
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</div>
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</div>
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</div>
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<div class="controls">
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<div class="control-section">
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<h4>重排操作 (Reflow)</h4>
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<p class="control-desc">改变元素尺寸或位置，触发布局计算</p>
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<button @click="changeWidth" class="btn reflow">改变宽度</button>
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<button @click="changePosition" class="btn reflow">改变位置</button>
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<button @click="addBox" class="btn reflow">添加元素</button>
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</div>
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<div class="control-section">
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<h4>重绘操作 (Repaint)</h4>
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<p class="control-desc">只改变外观，不触发布局</p>
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<button @click="changeColor" class="btn repaint">改变颜色</button>
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<button @click="changeBackground" class="btn repaint">
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改变背景
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</button>
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<button @click="toggleBorder" class="btn repaint">切换边框</button>
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</div>
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<div class="control-section">
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<h4>合成操作 (Composite)</h4>
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<p class="control-desc">只触发合成，性能最佳</p>
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<button @click="transformTranslate" class="btn composite">
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Transform 位移
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</button>
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<button @click="transformRotate" class="btn composite">
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Transform 旋转
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</button>
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<button @click="changeOpacity" class="btn composite">
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改变透明度
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</button>
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</div>
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</div>
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</div>
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<div class="info-section">
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<div class="info-card">
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<h4>什么是重排 (Reflow)？</h4>
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<p>
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当元素的位置、尺寸发生变化时，浏览器需要重新计算布局，这个过程叫重排。重排开销最大，因为要重新计算所有受影响元素的位置。
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</p>
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</div>
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<div class="info-card">
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<h4>什么是重绘 (Repaint)？</h4>
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<p>
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当元素的外观（颜色、背景）发生变化，但位置不变时，浏览器只需要重新绘制像素，这个过程叫重绘。比重排快，但仍有开销。
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</p>
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</div>
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<div class="info-card">
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<h4>什么是合成 (Composite)？</h4>
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<p>
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使用 transform 和 opacity
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等属性，浏览器可以在合成层上完成变化，完全不触发布局和绘制。性能最佳，推荐优先使用。
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</p>
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</div>
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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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const boxes = ref([
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{
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id: 1,
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x: 0,
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y: 0,
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width: 80,
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height: 80,
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color: '#3b82f6',
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bg: '#dbeafe',
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rotation: 0,
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opacity: 1,
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border: false,
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selected: false
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},
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{
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id: 2,
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x: 100,
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y: 0,
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width: 80,
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height: 80,
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color: '#8b5cf6',
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bg: '#ede9fe',
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rotation: 0,
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opacity: 1,
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border: false,
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selected: false
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},
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{
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id: 3,
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x: 0,
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y: 100,
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width: 80,
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height: 80,
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color: '#ec4899',
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bg: '#fce7f3',
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rotation: 0,
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opacity: 1,
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border: false,
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selected: false
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}
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])
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const currentOperation = ref('无')
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const performanceImpact = ref(0)
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const affectedElements = ref(0)
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const performanceLevel = computed(() => {
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if (performanceImpact.value <= 33) {
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return { class: 'good', text: '低' }
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} else if (performanceImpact.value <= 66) {
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return { class: 'medium', text: '中' }
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} else {
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return { class: 'high', text: '高' }
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}
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})
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function getBoxStyle(box) {
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return {
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left: box.x + 'px',
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top: box.y + 'px',
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width: box.width + 'px',
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height: box.height + 'px',
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backgroundColor: box.bg,
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borderColor: box.color,
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borderWidth: box.border ? '3px' : '0px',
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color: box.color,
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transform: `rotate(${box.rotation}deg)`,
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opacity: box.opacity
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}
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}
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function selectBox(id) {
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boxes.value.forEach((b) => (b.selected = b.id === id))
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}
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function updateMetrics(operation, impact, affected) {
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currentOperation.value = operation
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performanceImpact.value = impact
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affectedElements.value = affected
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}
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function changeWidth() {
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boxes.value.forEach((box) => {
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box.width = 60 + Math.random() * 60
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})
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updateMetrics('改变宽度', 90, boxes.value.length)
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}
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function changePosition() {
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boxes.value.forEach((box) => {
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box.x = Math.random() * 150
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box.y = Math.random() * 150
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})
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updateMetrics('改变位置', 85, boxes.value.length)
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}
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function addBox() {
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const newId = boxes.value.length + 1
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boxes.value.push({
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id: newId,
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x: Math.random() * 100,
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y: Math.random() * 100,
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width: 80,
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height: 80,
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color: '#10b981',
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bg: '#d1fae5',
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rotation: 0,
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opacity: 1,
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border: false,
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selected: false
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})
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updateMetrics('添加元素', 95, boxes.value.length)
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}
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function changeColor() {
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const colors = ['#3b82f6', '#8b5cf6', '#ec4899', '#10b981', '#f59e0b']
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boxes.value.forEach((box) => {
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box.color = colors[Math.floor(Math.random() * colors.length)]
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})
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updateMetrics('改变颜色', 50, boxes.value.length)
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}
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function changeBackground() {
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const bgs = ['#dbeafe', '#ede9fe', '#fce7f3', '#d1fae5', '#fef3c7']
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boxes.value.forEach((box) => {
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box.bg = bgs[Math.floor(Math.random() * bgs.length)]
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})
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updateMetrics('改变背景', 45, boxes.value.length)
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}
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function toggleBorder() {
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boxes.value.forEach((box) => {
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box.border = !box.border
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})
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updateMetrics('切换边框', 55, boxes.value.length)
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}
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function transformTranslate() {
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boxes.value.forEach((box) => {
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box.x += Math.random() * 20 - 10
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})
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updateMetrics('Transform 位移', 10, boxes.value.length)
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}
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function transformRotate() {
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boxes.value.forEach((box) => {
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box.rotation += Math.random() * 30 - 15
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})
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updateMetrics('Transform 旋转', 10, boxes.value.length)
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}
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function changeOpacity() {
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boxes.value.forEach((box) => {
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box.opacity = 0.5 + Math.random() * 0.5
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})
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updateMetrics('改变透明度', 10, boxes.value.length)
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}
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</script>
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<style scoped>
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.reflow-demo {
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border: 1px solid var(--vp-c-divider);
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background: var(--vp-c-bg-soft);
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border-radius: 12px;
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padding: 1.5rem;
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margin: 1.5rem 0;
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font-family: var(--vp-font-family-base);
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}
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.header {
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margin-bottom: 1.5rem;
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}
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.title {
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font-weight: 700;
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font-size: 1.05rem;
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}
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.subtitle {
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color: var(--vp-c-text-2);
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font-size: 0.9rem;
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margin-top: 0.3rem;
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}
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.demo-container {
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display: grid;
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grid-template-columns: 1fr 300px;
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gap: 1.5rem;
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margin-bottom: 1.5rem;
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}
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@media (max-width: 768px) {
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.demo-container {
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grid-template-columns: 1fr;
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}
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}
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.canvas-area {
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background: var(--vp-c-bg);
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border: 1px solid var(--vp-c-divider);
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border-radius: 10px;
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padding: 1.5rem;
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}
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.box-container {
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position: relative;
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height: 250px;
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margin-bottom: 1.5rem;
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border: 2px dashed var(--vp-c-divider);
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border-radius: 8px;
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}
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.box {
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position: absolute;
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display: flex;
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align-items: center;
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justify-content: center;
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font-weight: 700;
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font-size: 1.2rem;
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border-radius: 8px;
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cursor: pointer;
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transition: all 0.3s ease;
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user-select: none;
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}
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.box:hover {
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box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
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}
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.box.selected {
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box-shadow: 0 0 0 3px var(--vp-c-brand);
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}
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.performance-meter {
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margin-bottom: 1rem;
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}
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.meter-label {
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font-size: 0.85rem;
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color: var(--vp-c-text-2);
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margin-bottom: 0.5rem;
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}
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.meter-bar {
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height: 12px;
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background: var(--vp-c-bg-soft);
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border-radius: 6px;
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overflow: hidden;
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margin-bottom: 0.5rem;
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}
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.meter-fill {
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height: 100%;
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transition: all 0.5s ease;
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border-radius: 6px;
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}
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.meter-fill.good {
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background: linear-gradient(90deg, #22c55e, #14b8a6);
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}
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.meter-fill.medium {
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background: linear-gradient(90deg, #f59e0b, #f97316);
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}
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.meter-fill.high {
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background: linear-gradient(90deg, #ef4444, #dc2626);
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}
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.meter-value {
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font-size: 0.9rem;
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font-weight: 600;
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text-align: right;
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}
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.meter-value.good {
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color: #22c55e;
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}
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.meter-value.medium {
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color: #f59e0b;
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}
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.meter-value.high {
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color: #ef4444;
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}
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.stats {
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display: flex;
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gap: 1rem;
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}
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.stat-item {
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flex: 1;
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background: var(--vp-c-bg-soft);
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border-radius: 8px;
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padding: 0.8rem;
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}
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.stat-label {
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font-size: 0.75rem;
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color: var(--vp-c-text-2);
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margin-bottom: 0.3rem;
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}
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.stat-value {
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font-size: 0.95rem;
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font-weight: 600;
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color: var(--vp-c-text-1);
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}
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.controls {
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display: flex;
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flex-direction: column;
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gap: 1rem;
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}
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.control-section {
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background: var(--vp-c-bg);
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border: 1px solid var(--vp-c-divider);
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border-radius: 8px;
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padding: 1rem;
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}
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.control-section h4 {
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font-size: 0.9rem;
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font-weight: 600;
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margin-bottom: 0.3rem;
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color: var(--vp-c-text-1);
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}
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.control-desc {
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font-size: 0.75rem;
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color: var(--vp-c-text-2);
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margin-bottom: 0.8rem;
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}
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.btn {
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display: block;
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width: 100%;
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padding: 0.6rem;
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margin-bottom: 0.5rem;
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border: none;
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border-radius: 6px;
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font-size: 0.85rem;
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font-weight: 500;
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cursor: pointer;
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transition: all 0.2s;
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color: #fff;
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}
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.btn:last-child {
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margin-bottom: 0;
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}
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.btn.reflow {
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background: linear-gradient(135deg, #ef4444, #dc2626);
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}
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.btn.reflow:hover {
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background: linear-gradient(135deg, #dc2626, #b91c1c);
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}
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.btn.repaint {
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background: linear-gradient(135deg, #f59e0b, #f97316);
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}
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.btn.repaint:hover {
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background: linear-gradient(135deg, #f97316, #ea580c);
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}
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.btn.composite {
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background: linear-gradient(135deg, #22c55e, #14b8a6);
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}
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.btn.composite:hover {
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background: linear-gradient(135deg, #14b8a6, #0d9488);
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}
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.info-section {
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display: grid;
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grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
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gap: 1rem;
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}
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.info-card {
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background: var(--vp-c-bg);
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border: 1px solid var(--vp-c-divider);
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border-radius: 8px;
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padding: 1rem;
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}
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.info-card h4 {
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font-size: 0.9rem;
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font-weight: 600;
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margin-bottom: 0.5rem;
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color: var(--vp-c-text-1);
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}
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.info-card p {
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font-size: 0.85rem;
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color: var(--vp-c-text-2);
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line-height: 1.6;
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margin: 0;
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}
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</style>
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