Redux要求reducer必须是纯函数，禁止修改原状态。使用push等突变方法会破坏纯函数原则，导致浅比较失效、UI不更新、时间旅行调试失灵。正确做法是返回新数组（如[...state, item]）以确保引用变化和状态隔离。本文详解纯函数约束、Redux状态检测机制及不可变更新的实现方式。

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