简易广告管理系统，用sql helper实现，repeater做数据展示-Simple advertising management system, using SQL helper, repeater data show

一个支持四则运算的简易计算器，简洁方便，绿色精巧，无病毒无广告(A simple calculator that supports four operations, simple and convenient, green, sophisticated, free of viruses, without advertising)

轮播图的增删改查，设置时间，位置，停留时间(Carousel figure crud, set the time, location, residence time)