$user = new UserController; === $user=A(“User”);
$user = new UserController;
$user->fun(); === R(“User/fun”);
跨模块调用
R(“Home/User/fun”);
R(“Book://Home/User/fun”);
R函数是对A方法的封装
原文：http://www.cnblogs.com/8000cabbage/p/6253839.html
