To improve maintain ability, this thesis adopted object oriented design method, the modules of the component is designed and realized in independent classes, which makes the program clear and easy to maintain.

• 然后，详细阐述了组件的各个功能模块的软件设计思想和具体实现：为了提高组件的可维护性，引入了面向对象的设计方法，对组件中各功能模块以独立的类的形式进行设计和实现，使程序结构清晰便于维护和升级。