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React Native #45

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TokenYangForever opened this issue Jun 12, 2018 · 0 comments
Open

React Native #45

TokenYangForever opened this issue Jun 12, 2018 · 0 comments

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@TokenYangForever
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TokenYangForever commented Jun 12, 2018 •
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fbjs

pureComponent

  • 一个组件前后接收相同的state和props，得到相同的渲染结果，那么就可以继承pureComponent。state/props是否相同，会通过fbjs/lib/shallowEqual函数来进行比较，这是一个浅比较的过程(所以应该只针对state/props比较简单且层级较低的情况，复杂结构就比较不出来了)。
  • 使用pureComponent时，如果组件的 props 和 state 都没发生改变， render 方法就不会触发，省去 Virtual DOM 的生成和比对过程，达到提升性能的目的。
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