"Dojo: The Definitive Guide"

Even bad products can have good books written about them

There are mediocre JavaScript libraries and there are some really bad ones as well and each has its followers who disregard all of the flaws in the library because it makes what they are trying to do easier. There are also books available that describe how to use the various libraries and the quality of the book can be much better than the quality of the library that it describes.

Dojo: The Definitive Guide