完成的功能是将未组合BCD码转换为二进制码，因为未组合BCD码每字节只存放一位BCD数，高半字节为0。所以低位主要采用十位乘10再加上个位的方法，具体通过左移来实现，最后将低位转换结果加上高位实现最终转换。-Complete the function is not BCD code into binary code, because without the combination of BCD codes per byte store only a BCD number, high byte is 0.So low mainly adopts ten bits by 10 plus method on a specific implementation, through the left shift, the low conversion results with high ultimate conversion