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为什么vue react 中列表渲染用加 key #1

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w990752800 opened this issue Apr 2, 2020 · 0 comments

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w990752800 commented Apr 2, 2020

通过key比较两个节点是否相同，相同就复用，不同就重现渲染
不加key 性能会更好，不加key 就不会销毁dom，只是替换里面的值，但是这样就不能区分组件的状态

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