Proleps

I started learning javascript and web development a while a go. I decided to learn javascript without any frameworks or libraries so I would properly learn the basics.

So far I haven't really felt the need to use frameworks or libraries. I've been close to using JQuery but I've able to avoid it until now. But even if I end up using JQuery, it is just a library and not a framework.

What do frameworks like Backbone.js, and ember.js have to offer? These frameworks offer functionality at the cost of adding a lot of complexity.