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                `React.PureComponent`與`React.Component`完全相同,只是它為你處理了`shouldComponentUpdate()`方法。當屬性或狀態發生變化時,PureComponent 將對屬性和狀態進行**淺比較**。另一方面,一般的組件不會將當前的屬性和狀態與新的屬性和狀態進行比較。因此,在默認情況下,每當調用`shouldComponentUpdate`時,默認返回 true,所以組件都將重新渲染。 ## 參考 [react面試題](https://github.com/semlinker/reactjs-interview-questions)
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