程序指令　        执行后AX数据　 执行后BX数据　
mov ax,001AH      001AH          0000H
mov bx,0026H      001AH          0026H
add al,bl         0040H          0026H
add ah,bl         2640H          0026H <--- ah = 00H , al = 40H
                                            ax = 0040H
                                            bh = 00H , bl = 26H
                                            bx = 0026H
                                         执行 ah = ah + bl
                                              ah = 00H + 26H = 26H
                                         所以 ah = 26H , al = 40H
                                              ax = 2640H
                                         bx 不变
add bh,al         2640H          4026H <---这里类似

谢谢石头哥~完全明白了~3Q3Q[em1]