有时因为要从数据库中装入大量数据或者要装入大型位图而使程序界面在启动时显示的较慢，这时候可能希望在启动时给出一个快速显示的窗体，这种窗体叫做欢迎窗体。-Sometimes because of a large amount of data is loaded the or to load a large bitmap and make the program interface display slower at startup, then you may want to give a qu