A1为字符串 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"=MID($A$1,INT(RAND()*25+1),1)&MID($A$1,INT(RAND()*25+1),1)&MID($A$1,INT(RAND()*25+1),1)&MID($A$1,INT(RAND()*25+1),1)&MID($A$1,INT(RAND()*25+1),1)&MID($A$1,INT(RAND()*25+1),1)
