16进制转10进制 参数不得含'0'～'9'、'a'～'f'、'A'～'F'之外的任意字符（首尾空格除外），否则返回0(16 hexadecimal to 10 decimal parameters, shall not contain'0'~'9','a'~'f','A'~'F' except any character (except for the front and back spaces), or else 0)