自己开发的电子时钟小程序，通过数码管显示时间，key1和key2控制校时校分，key3切换时钟模式和闹钟模式，切换到闹钟模式再按key1和key2即可设定闹钟时间。key4控制开启/关闭闹钟。有整点报时功能。(Self developed electronic clock applet, through the digital tube display time, key1 and key2 control time correction, Key3 switch clock mode and