CrossApp中，整个工程的入口函数是AppDelegate，在AppDelegate中屏蔽了多平台之间的区别，从而实现了跨平台。
言归正传，CrossApp中修改默认打开的Window的方法和Cocos2d-x中是相似的，但是对于没有学习过Cocos2d-x的朋友，还是需要介绍一下。
首先，需要修改一下AppDelegate.cpp中所导入的头文件：
[cpp] view plain copy
#include "AppDelegate.h"
#include "RootWindow.h"
上边是修改之前的，将下边的RootWindow.h改成我们自己window的头文件 在这里我自己写的窗口的头文件是" MainMenuWindow.h"
修改后：
[cpp] view plain copy
#include "AppDelegate.h"
#include "MainMenuWindow.h"
接下来修改一下 bool AppDelegate ::applicationDidFinishLaunching()函数中的实现，这个函数是在程序载入完毕之后执行的。
没修改前：
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