#include "REGX52.h" void delay(unsigned int us) { while(us--) { } } void main() { while(1) { if(P3_0==0) { delay(500); while(P3_0==0); delay(500); while(1) { P2_0=0; delay(5000); P2_0=1; delay(5000); if(P3_1==0) { break; } } } } } 求大佬指点改进，刚开始学习51单片机，这是我自己写的按键控制LED 闪烁，按键控制LED熄灭