Safari->偏好设置->标签      勾选中间一项(新标签或新窗口打开时使其活跃)，OK！这样就好了。

在系统偏好设置--->Expose&Spaces----->Expose 自己设置 我设置为左下角为触发显示桌面  把鼠标往左下角放就OK了

ok，腾讯面试:oc单例模式  static  DataManager  * sharedDataManager  =  nil; +  (DataManager  * ) sharedManager {     @synchronized(self)  {

错误信息： 2012-07-24 10:35:19.449 appname[5892:16f0b] Unable to load persistent store at URL 'file://localhost/Users/username/Library/Application%20Support/iPhone%20Simulator/5.1/Library/Keyboard/UserD

http://blog.youkuaiyun.com/iukey/article/details/8015114