how to use Backbone.js, but in the NO-RESTful way?

I'm now a front-end developer, and I have a project which is fine to use BackboneJS, and the server-side is written by others. Is there anyone who can tell me how to override delete, update, add, and so on in a not-RESTful way? The server-side's URL may be like this:

• add: www.domain.com/addBookById
• remove: www.domain.com/removeBookById

Thanks a lot!!