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useState使用更新函数方式更新数据不生效的问题 #162

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ckinmind opened this issue Aug 14, 2020 · 0 comments

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ckinmind commented Aug 14, 2020

问题描述

使用useState的更新函数去更新值，拿到最新的值之后，操作然后返回这个值，结果发现不更新，值是个二维数组，操作是删除其中的某一个数据

问题解决

官方文档里写了一段话React 使用 Object.is 比较算法来比较 state, 这意味着useState是通过判断比较前后值是否是同一个对象来决定是否更新，而如果只是个二位数组或者对象，直接在原数据上操作，并且返回原数据，则比较的是同一个对象，当然就不更新了，所以react提倡state使用immutable数据

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ckinmind added the Hooks相关 label

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