FLEX 基础教程代码实例，比较初级好用的代码，很适合初学者-FLEX basic tutorial code examples to compare the primary user-friendly code, it is suitable for beginners

活动：应用程序中的单个屏幕提供用户界面。 对于一个应用程序来说可以有若干个活动，启动是提供给用户的活动叫做主要活动。 -Activities: The application provides a single-screen user interface. For an application, it can have several activities, start-up is provided to the user activity is called the primary a

用户管理系统 系统层次： common -> Get Connection -> UserInfo(id,name,pass,email,power) DAO ->userDAO(注册、删除、查询等功能) Service ->userService(调用DAO中的方法) VIEW ->普通用户界面，管理员界面，超级用户界面 数据库表：userinfo 序列:seq_user

Opencv中比较初级的特征提取，主要包括特征点的提取，方便初级使用者学习使用-Comparative Opencv primary feature extraction, feature point extraction including easy to learn to use the primary user