长列表虚拟滚动优化方案

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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。

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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