how to utilize the source to run cesium

I`m a rookie to the cesium. I want to develop a demo to display our lab’s map source.

The normal process is to modify the source files, and then build the source files into js library with the build.xml. However, it is difficult for me to debug the project in the client side.
I wonder that if i can use the source files directly without the build process, that means the client side will download the whole js source files. In this way, i can debug the project much easier on the client side.
If utilizing the source files is impossible, then how to debug the project?

Looking forward to your reply.