AS3: singleton pattern implementation code

Not much to say directly on the code:

public class ViewManager
{

        static private var instance:ViewManager;
        static public function get Instance():ViewManager
        {
            if(instance == null){
                instance = new ViewManager();
            }
            return instance;
        }
}

Code Description:

• Create a public class: ViewManager
• Declare a private static variables: instance (type is a class ViewManager)
• When you first create ViewManager of, instance == null, direct new
• After the second until, instance! = Null, direct return instance

External direct invocation:

ViewManager.Instance.aa();