浅记koa的洋葱模型实现
Home Page: https://github.com/koajs/compose
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新手上路，麻烦大佬帮个忙解释下。我自己实践了下，不会错乱。
单个请求中间件执行顺序可以理解
koa2底层还是调用node自带的http， creatServer的回调方法，参数有req和res。
并发请求来到服务器时，先到http.createServer(this.callback())，然后每个请求分别走自己的callback()，互不干扰且是异步的。并发请求导致各自callback()都在运行，每个callback()都在打印日志，感觉会乱。
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