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长列表虚拟滚动优化方案
处理超过 1000 条数据的大型列表渲染时的性能优化方案，包含定高和不定高两种策略。
SKILL.md
Full skill instructions
长列表虚拟滚动优化方案
当列表数据量巨大（如日志列表、审计记录，n > 1000）时，直接渲染会导致 DOM 节点过多，页面卡顿。
核心原理
只渲染当前可视区域 (Viewport) 内的元素，加上缓冲区 (Buffer) 的元素。随着滚动条滚动，动态替换 DOM 内容。
推荐方案
1. 定高列表 (Item Height Fixed)
如果每一行高度固定（例如 40px），推荐使用轻量实现。
使用方式：
<VirtualList :items="logList" :item-height="40" :container-height="400">
<template #default="{ item }">
<div class="log-item">{{ item.message }}</div>
</template>
</VirtualList>
📦 获取完整组件实现：
skill://virtual-list/assets/VirtualList.vue
2. 不定高列表 (Dynamic Height)
如果列表项高度不固定（如包含展开/收起、不同长度文本），计算逻辑会变得复杂。
推荐库: vue-virtual-scroller 的 DynamicScroller 组件。
<template>
<DynamicScroller
:items="items"
:min-item-size="54"
class="scroller"
>
<template #default="{ item, index, active }">
<DynamicScrollerItem
:item="item"
:active="active"
:size-dependencies="[
item.message,
]"
:data-index="index"
>
<div class="message">{{ item.message }}</div>
</DynamicScrollerItem>
</template>
</DynamicScroller>
</template>
注意事项
- 滚动白屏: 滚动过快时可能出现瞬间白屏，适当增加
buffer缓冲区大小。 - 搜索/筛选: 虚拟列表与搜索过滤不冲突，只需对
props.items进行 computed 过滤即可。
📦 可用资源
skill://virtual-list/assets/VirtualList.vue
根据 SKILL.md 中的 IF-THEN 规则判断是否需要加载
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