#include <reg51.h>sbit key=P3^3;sbit led=P0^1;unsigned char a=0;void main (){led=0;EA=1;EX0=1;IT0=1;while(1){ if(a==1) { led=1; } else { led=0; }}}void zhongduan() interrupt 0{ if(key==0) { a=1; }}我要按下去亮,但按下去没反应,求原因啊
是