Comments (1)
Henry-Diasa
commented on July 20, 2024
Diff算法就是为了找不同然后执行更新的操作，严格的比较两棵树的时间复杂度是O(n ^ 3)
diff的时候涉及到一些优化，降低到O(n)
- 只同层级比较，不跨层比较
- tag不同则删除重建（不比较内部的细节）
- 子节点通过key区分
React - 仅右移
新节点和旧节点比较时，老节点仅右移（新的索引大于老的索引）
Vue2 - 双端比较
注意四个指针，分别前后比较，交叉比较。
Vue3 - 最长递增子序列
例如 [3, 5, 7, 1, 2, 8] 最长递增 [3, 5, 7, 8] (也可以看看leetcode里面的算法)
比较过程首先和vue2一样 前后和交叉比较, 最终的索引所构成的最长递增子序列是 [2, 3, 4] 所以这三个节点就不需要改变了。最大程度减少dom的操作
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