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react 父函数组件更新的时候是不是子函数组件总会被执行？如果是那每次更新岂不是很消耗性能？

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react 父函数组件更新的时候是不是子函数组件总会被执行？如果是那每次更新岂不是很消耗性能？

我在练习react hooks但是每次都发现， 即使父组件里面更新的东西和子组件一点关系也没有，父组件更新了，子组件里面的东西又跟着运行了一波 ，
请问各位大佬这是正常的吗？


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正常，全量render的，在class里也一样的，如果你想子组件不更新可以使用useMemo


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