jQuery插件
jQuery.extend 函数详解
http://www.cnblogs.com/RascallySnake/archive/2010/05/07/1729563.html
jQuery中$.fn的用法示例介绍
http://www.jb51.net/article/42816.htm
jQuery(function(){});与(function(){})(jQuery);的区别
http://blog.sina.com.cn/s/blog_667a8c2f0100yk7d.html
Jquery的$命名冲突:
http://www.cnblogs.com/RascallySnake/archive/2010/05/07/1729417.html