1 #include <reg51.h>
 2 #define on 0
 3 #define off    1
 4 typedef unsigned char u8;
 5 typedef unsigned int u16; 
 6 sbit LED0=P2^0;
 7 sbit LED1=P2^1;
 8 sbit LED2=P2^2;
 9 sbit LED3=P2^3;
10 sbit LED4=P2^4;
11 sbit LED5=P2^5;
12 sbit LED6=P2^6;
13 sbit LED7=P2^7;
14 
15 void delay(u16 i)
16 {
17     while(i--);
18 }
19 
20 void main()
21 {
22     while(1)
23     {
24          LED0=on;
25          delay(1000000);
26          LED0=off;
27          LED1=on;
28          delay(1000000);
29          LED1=off;
30          LED2=on;
31          delay(1000000);
32          LED2=off;
33          LED3=on;
34          delay(1000000);
35          LED3=off;
36          LED4=on;
37          delay(1000000);
38          LED4=off;
39          LED5=on;
40          delay(1000000);
41          LED5=off;
42          LED6=on;
43          delay(1000000);
44          LED6=off;
45          LED7=on;
46          delay(1000000);
47          LED7=off;
48     }
49 }

Tips:

不过例如"LED3=off",

不能写成"P2^3=off".

必须用sbit为引脚取别名,

否则,"P2^3=1"的语句也不容易理解.