There are several things to consider on mobile devices compared to computers. There is no hover function, for example, so all features that realy on that won't work on mobiles. Then there are screen dimensions and font sizes to consider. In my framework different font faces and sizes are selected according to the device, browser and platform detected. It's lots of little things that you need to be aware of, really.
I didn't want to teach jQuery or other frameworks that are more advanced, instead I provide a simple, procedural (rather than object oriented) JavaScript framework to make things easy for people new to JavaScript, and who just simply want stuff to work quickly.