模仿koajs的middware设计思想实现异步任务链式处理 | 流云诸葛

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https://blog.liuyunzhuge.com/2020/06/11/%E6%A8%A1%E4%BB%BFkoajs%E7%9A%84middware%E8%AE%BE%E8%AE%A1%E6%80%9D%E6%83%B3%E5%AE%9E%E7%8E%B0%E5%BC%82%E6%AD%A5%E4%BB%BB%E5%8A%A1%E9%93%BE%E5%BC%8F%E5%A4%84%E7%90%86/