请问这个mapping[url]该如何理解 ？？

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#1 Created at ... [Delete] [Delete and Lock User]

文章中： let mapping = require(__dirname + '/controller/' + f);

为什么会有 router.get(path, mapping[url]);

这个mapping[url]该如何理解？？

#2 Created at ... [Delete] [Delete and Lock User]

我觉得这个mapping是controller下面的f.js文件暴露的变量

#3 Created at ... [Delete] [Delete and Lock User]

获取数组中指定位置的元素qaq

#4 Created at ... [Delete] [Delete and Lock User]

不对不对，打了断点调试了一下，大概相当于 async (ctx,next) =>{ … }

#5 Created at ... [Delete] [Delete and Lock User]

以index.js为例，第一次遍历url赋值'GET /'，mapping[url]就是找到mapping里面url元素对应的内容，就是前面写的fn_index，也就是async (ctx, next) => {...}这个函数