新手求助

学习了一个独立按键控制LED灯的程序，但是在按键5按下去之后松开LED灯不会熄灭？
程序如下：#include "reg51.h"
***it key1=P3^0;
***it key2=P3^1;
***it key3=P3^2;
***it key4=P3^3;
***it key5=P3^4;
void delay(unsigned int i)
{
unsigned char j;
for(i; i > 0; i--)
for(j = 100; j > 0; j--);
}
main()
{
while(1)
{
P2 = 0xff;
if(key1==0)
{
delay(5);
if(key1==0)
P2 = 0xfe;
while(!key1);
}
if(key2==0)
{
delay(5);
if(key2==0)
P2 = 0xfd;
while(!key2);
}
if(key3==0)
{
delay(5);
if(key3==0)
P2 = 0xfb;
while(!key3);
}
if(key4==0)
{
delay(5);
if(key4==0)
P2 = 0xf7;
while(!key4);
}
if(key5==0)
{
delay(5);
if(key5==0)
P2 = 0xef;
while(!key5);
}
}
}