#include<reg51.h> void delay(unsigned int xms){ //ÑÓʱº¯Êý unsigned int i, j; for(i=0; i<xms; ++i) for(j=0; j<110; ++j); } void main(){ while(1) { while(P0==0xFE) { P2=0xFE; delay(200); P2=0xFD; delay(200); P2=0xFB; delay(200); P2=0xF7; delay(200); P2=0xEF; delay(200); P2=0xDF; delay(200); P2=0xBF; delay(200); P2=0x7F; delay(200); } while(P0==0xFD) { P2=0xFE; delay(200); P2=0xFD; delay(200); P2=0xFC; delay(200); P2=0xFB; delay(200); P2=0xEA; delay(200); P2=0xDF; delay(200); P2=0xBE; delay(200); P2=0x7D; delay(200); } while(P0==0xFB) { P2=0xFA; delay(200); P2=0xF4; delay(200); P2=0xF6; delay(200); P2=0xF7; delay(200); P2=0xA4; delay(200); P2=0x56; delay(200); P2=0x47; delay(200); P2=0x7F; delay(200); } while(P0==0xF7) { P2=0xFE; delay(50); P2=0xFD; delay(50); P2=0xFB; delay(50); P2=0xF7; delay(50); P2=0xEF; delay(50); P2=0xDF; delay(50); P2=0xBF; delay(50); P2=0x7F; delay(50); } while(P0==0xEF) { P2=0xFE; delay(50); P2=0xFD; delay(50); P2=0xFC; delay(50); P2=0xFB; delay(50); P2=0xEA; delay(50); P2=0xDF; delay(50); P2=0xBE; delay(50); P2=0x7D; delay(50); } while(P0==0xDF) { P2=0xFF; delay(500); P2=0x00; delay(500); } while(P0==0xBF) { P2=0xEA; delay(200); P2=0xDF; delay(200); P2=0xBD; delay(200); P2=0x7E; delay(200); } while(P0==0x7F) { P2=0xFF; delay(500); } } }

这段代码看起来是在控制 LED 灯的亮灭，但是代码结构比较混乱，建议可以进行如下的优化：

1. 引入宏定义，将常数定义为宏进行使用，方便后续修改和维护。
2. 将 LED 灯控制的代码封装成一个函数，方便后续调用和维护。
3. 使用 switch-case 语句替换多个嵌套的 while 循环，提高代码可读性和可维护性。

下面是优化后的代码，供您参考：

#include <reg51.h>

#define DELAY_TIME 200
#define SHORT_DELAY_TIME 50
#define LONG_DELAY_TIME 500

void delay(unsigned int xms) {
    unsigned int i, j;
    for (i = 0; i < xms; ++i) {
        for (j = 0; j < 110; ++j);
    }
}

void controlLED(unsigned char value) {
    switch (value) {
        case 0xFE:
            P2 = 0xFE;
            delay(DELAY_TIME);
            P2 = 0xFD;
            delay(DELAY_TIME);
            P2 = 0xFB;
            delay(DELAY_TIME);
            P2 = 0xF7;
            delay(DELAY_TIME);
            P2 = 0xEF;
            delay(DELAY_TIME);
            P2 = 0xDF;
            delay(DELAY_TIME);
            P2 = 0xBF;
            delay(DELAY_TIME);
            P2 = 0x7F;
            delay(DELAY_TIME);
            break;
        case 0xFD:
            P2 = 0xFE;
            delay(DELAY_TIME);
            P2 = 0xFD;
            delay(DELAY_TIME);
            P2 = 0xFC;
            delay(DELAY_TIME);
            P2 = 0xFB;
            delay(DELAY_TIME);
            P2 = 0xEA;
            delay(DELAY_TIME);
            P2 = 0xDF;
            delay(DELAY_TIME);
            P2 = 0xBE;
            delay(DELAY_TIME);
            P2 = 0x7D;
            delay(DELAY_TIME);
            break;
        case 0xFB:
            P2 = 0xFA;
            delay(DELAY_TIME);
            P2 = 0xF4;
            delay(DELAY_TIME);
            P2 = 0xF6;
            delay(DELAY_TIME);
            P2 = 0xF7;
            delay(DELAY_TIME);
            P2 = 0xA4;
            delay(DELAY_TIME);
            P2 = 0x56;
            delay(DELAY_TIME);
            P2 = 0x47;
            delay(DELAY_TIME);
            P2 = 0x7F;
            delay(DELAY_TIME);
            break;
        case 0xF7:
            P2 = 0xFE;
            delay(SHORT_DELAY_TIME);
            P2 = 0xFD;
            delay(SHORT_DELAY_TIME);
            P2 = 0xFB;
            delay(SHORT_DELAY_TIME);
            P2 = 0xF7;
            delay(SHORT_DELAY_TIME);
            P2 = 0xEF;
            delay(SHORT_DELAY_TIME);
            P2 = 0xDF;
            delay(SHORT_DELAY_TIME);
            P2 = 0xBF;
            delay(SHORT_DELAY_TIME);
            P2 = 0x7F;
            delay(SHORT_DELAY_TIME);
            break;
        case 0xEF:
            P2 = 0xFE;
            delay(SHORT_DELAY_TIME);
            P2 = 0xFD;
            delay(SHORT_DELAY_TIME);
            P2 = 0xFC;
            delay(SHORT_DELAY_TIME);
            P2 = 0xFB;
            delay(SHORT_DELAY_TIME);
            P2 = 0xEA;
            delay(SHORT_DELAY_TIME);
            P2 = 0xDF;
            delay(SHORT_DELAY_TIME);
            P2 = 0xBE;
            delay(SHORT_DELAY_TIME);
            P2 = 0x7D;
            delay(SHORT_DELAY_TIME);
            break;
        case 0xDF:
            P2 = 0xFF;
            delay(LONG_DELAY_TIME);
            P2 = 0x00;
            delay(LONG_DELAY_TIME);
            break;
        case 0xBF:
            P2 = 0xEA;
            delay(DELAY_TIME);
            P2 = 0xDF;
            delay(DELAY_TIME);
            P2 = 0xBD;
            delay(DELAY_TIME);
            P2 = 0x7E;
            delay(DELAY_TIME);
            break;
        case 0x7F:
            P2 = 0xFF;
            delay(LONG_DELAY_TIME);
            break;
        default:
            break;
    }
}

void main() {
    while (1) {
        unsigned char value = P0;
        controlLED(value);
    }
}