值得注意的是： 大多数 Web 框架（如 Express、Koa）都提供了错误捕获中间件机制，而一个典型错误就是把错误处理代码写在这个中间件里。 这样做的问题在于，中间件只能覆盖"请求上下文"中的错误，无法复用同一套处理器去应对定时任务、消息队列订阅者、未捕获异常等其他场景的错误。

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