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react中对深层子组件进行状态更新，在diff时还会从根比较两棵完整的树吗

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react中对深层子组件进行状态更新，在diff时还会从根比较两棵完整的树吗

比如App组件是项目的根组件，它的深层里有一个子组件Dog状态更新了。此时做diff比较时，是用新旧APP组件比较两棵完整的大树，还是只diff比较Dog下的树？


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