在Express和MEAN堆栈中的路由。

I am following an on-line tutorial of implementing in MEAN. Everything looks great. Except when it comes to routes. I understand that routes need to be in a javascript files (js extension). It's okay with a small web site. But as the number of requests grow, I would like to put them in separate files. I looked up in SOF for how to include files in Javascript. It is non-trivial. Has anyone faced this issue before? Can anyone comment?I am following an on-line tutorial of implement