摘要： 基本框架图：单例代码（经常要用到）：public class FlickrModelLocator implements IModelLocator｛　　private static var _instance:FlickrModelLocator;　public function FlickrModelLocator(enforcer:ModelSingletonEnforcer)　{　　if(enforcer==null)　　{　　　　throw new Error("You can only have one flickrModelLocator");　　}}public static 阅读全文