React组件销毁中清理异步操做和取消请求

问题描述: 一般是 react 组件已销毁，可是组件中一些异步操做还未结束会报以下这个错误: Warning: Can't perform a React state update on an unmounted component. This is a no-op, but it indicates a memory leak in your application. To fix, cance

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