JS文件被加密怎么样解请教高手
样本如上：（有于限制发帖字数只发了一点点）

OlOlll="(x)";OllOlO=" String";OlllOO="tion";OlOllO="Code(x)}";OllOOO="Char";OlllOl="func";OllllO=" l = ";OllOOl=".from";OllOll="{return";Olllll="var";eval(Olllll+OllllO+OlllOl+OlllOO+OlOlll+OllOll+OllOlO+OllOOl+OllOOO+OlOllO);eval(l(79)+l(61)+l(102)+l(117)+l(110)+l(99)+l(116)+l(105)+l(111)+l(110)+l(40)+l(109)+l(41)+l(123)+l(114)+l(101)+l(116)+l(117)+l(114)+l(110)+l(32)+l(83)+l(116)+l(114)+l(105)+l(110)+l(103)+l(46)+l(102)+l(114)+l(111)+l(109)+l(67)+l(104)+l(97)+l(114)+l(67)+l(111)+l(100)+l(101)+l(40)+l(77)+l(97)+l(116)+l(104)+l(46)+l(102)+l(108)+l(111)+l(111)+l(114)+l(40)+l(109)+l(47)+l(49)+l(48)+l(48)+l(48)+l(48)+l(41)+l(47)+l(57)+l(57)+l(41)+l(59)+l(125));eval(""+O(31681195)+O(112864837)+O(108902134)+O(99002433)+O(45544051)+O(114844687)+O(109894619)+O(99004071)+O(96037439)+O(119790314)+O(60399044)+O(108909338)+O(99996782)+O(117819775)+O(31689869)+O(67323536)+O(96039924)+O(114843518)+O(99994094)+O(39604369)+O(40596532)+O(58417443)+O(31685396)+O(12876203)+O(9907453)+O(12873649)+O(9900129)+O(31685257)+O(31687924)+O(31684067)+O(31682238)+O(112864118)+O(108908970)+O(99003278