有没有办法检查反应组件是否已卸载？ [英] Is there a way to check if the react component is unmounted?

问题描述

我有一个用例，我需要卸载我的反应组件。但在某些情况下，特定的反应组分不会被不同的功能所替代。
因此，我需要在卸载之前检查组件是否已安装。

I have a usecase where i need to unmount my react component. But in some cases, the particular react component is unmounted by a different function. Hence, I need to check if the component is mounted before unmounting it.

推荐答案

自 isMounted（）正在被弃用，你可以在你的组件中执行此操作：

Since isMounted() is being officially deprecated, you can do this in your component:

componentDidMount() { 
  this._ismounted = true;
}

componentWillUnmount() {
   this._ismounted = false;
}

这种维持你自己的州的模式变量在ReactJS文档中有详细说明： https ：//facebook.github.io/react/blog/2015/12/16/ismounted-antipattern.html

This pattern of maintaining your own state variable is detailed in the ReactJS documentation: https://facebook.github.io/react/blog/2015/12/16/ismounted-antipattern.html

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