Node.js - 如何在我的本地计算机上设置服务器并允许某人访问它（用于测试）

I am writing a node.js app and need to get a friend to help test it for me(at a different location). Can I set something up on my local machine to allow him to access it? I tried Googling but found little help.I am writing a node.js app and need to get a fr