#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
uint i,j; //切记此处不能用uchar
sbit led1=P1^0;
void sleep() //延时1秒
{
for(i=1000;i>0;i--)
{
for(j=110;j>0;j--)
{
}
}
void main()
{
while(1)
{
led1=0;
sleep();
led1=1;
sleep();
}
}