现在 3 个 ruby developer，就有 2 个是 javascript 熟手。所以多看看别人的 javascript 项目一定会开阔眼界。今天介绍的是 Mozilla 发布的 TowTruck，

TowTruck easily gives your website text and/or audio chat, presence, co-authoring, co-browsing, and is built to be extended by your website.

https://blog.mozilla.org/labs/2013/04/introducing-towtruck/

如果不想看介绍的可以看一个小视频：

http://vimeo.com/57992755

工程代码地址： https://github.com/mozilla/towtruck