利用xilin实验仪完成一个可以计时的数字时钟，显示范围位00.00～59.59，且该时钟应该具有暂停计时，清零灯功能。-Xilin completed experiment using a digital time clock, indicating the scope of digital 00.00 ~ 59.59, and the clock should have suspended time, Clear Lantern f