用P1口控制数码管的段码线（A~G、DP），P2口控制数码管的位选线，用动态扫描方法，崽个数码管上显示12345678-With the P1 port control segment digital tube-yard line (A ~ G, DP), P2 port control bit digital control line selection, using dynamic scanning method, young of animals displayed on a digita