各位来帮帮忙看一下#include<reg51.h>unsigned char times;sbit key=P1^0;sbit led=P1^4;void delay(unsigned char a){unsigned char i,j;for(i=0;i<a;i++)for(j=0;j<120;j++);}main(){led=1;while(1){if(key==0){while(key==0);times++;times%=3;}switch(times){case 0:led=1;break;case 1:led=0;break;case 2:led=~led;delay(100);break;default:break;}}}这个代码修改哪里可以变成按三次点亮 再按五次熄灭 返回按三次点亮持续循环？修改哪里呢各位老哥们求解答