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第210题(2020-05-11)：react 与 vue 数组中 key 的作用是什么?(阿里） #212

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qappleh opened this issue May 11, 2020 · 1 comment

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react vue 阿里

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qappleh commented May 11, 2020

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qappleh commented May 12, 2020

diff算法需要比对虚拟dom的修改，然后异步的渲染到页面中，当出现大量相同的标签时，vnode会首先判断key和标签名是否一致，如果一致再去判断子节点一致，使用key可以帮助diff算法提升判断的速度，在页面重新渲染时更快消耗更少。

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