? | Charset ===+========= l | abcdefghijklmnopqrstuvwxyz (26个小写字母) u | ABCDEFGHIJKLMNOPQRSTUVWXYZ (26个大写字母) d | 0123456789 (0-9数字)446515184 h | 0123456789abcdef (数字和小写字母) H | 0123456789ABCDEF(数字和大写字母) s | !"#$%&'()*+,-./:;<=>?@[]^_`{|}~ (特殊字符) a | ?l?u?d?s (键盘上所有可见的字符) b | 0x00 - 0xff(可能是用来匹配像空格这样密码的)