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关于新旧节点patch问题 #6

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chenchangyuan opened this issue Mar 21, 2019 · 1 comment

chenchangyuan commented Mar 21, 2019

大佬你好，请问为何不直接将oldVNode删除，用newVNode直接替换呢

zhanyuzhang commented Apr 14, 2020

大佬你好，请问为何不直接将oldVNode删除，用newVNode直接替换呢
Vue 的 patch 过程，主要是为了最大程度的复用原先的 dom 。vnode 树和 dom 树中的节点其实是一一对应的。如果你直接删除旧的 vnode 并插入新的 vnode ，会导致 dom 树上也会删除旧的节点并插入新的节点。这就没有复用性可言了。而 dom 的操作是非常消耗性能的

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