问题
I can find documentation for their super class JApplication, but I can't find documentation for either of these classes?
回答1:
I don't know where there is any online documentation but I can tell you where they are defined:
JSite: [site root]/includes/application.php
JAdministrator: [site root]/administrator/includes/application.php
回答2:
http://api.joomla.org/Joomla-Framework/Application/JApplication.html - but you have probably seen it already.
Most of the publicly available documentation is very poor, but I found this book useful: Mastering Joomla! 1.5 Extension and Framework Development
回答3:
Actually Joomla has always some changes in joomla-API in each version so, it's depends on version what is the flow of document reference.
I use joomla 2.5 here i'm sharing a link plz follow if you get an idea. http://doc.joomladev.eu/api25/
Find this class in: libraries/joomla/application/application.php
other classes also found in libraries folder.
来源：https://stackoverflow.com/questions/2604889/jsite-jadministrator-in-joomla