看到「12 Days of HaXmas: Improvements to jsobfu」這篇文章裡提到 JSObfu 這個工具...
文章裡的範例：
$ echo "console.log('Hello World')" | jsobfu
window[(function () { var E="ole",d="ons",f="c"; return f+d+E })()][(String.fromChar
Code(108,111,0147))](String.fromCharCode(0x48,0x65,0154,0154,111,32,0127,0x6f,114,01
54,0x64));
如果要他滾三次，就變成：
$ echo "console.log('Hello World')" | jsobfu 3
window[(function(){var T=String[(String.fromCharCode(102,114,0x6f,109,0x43,104,97,0x
72,0x43,0157,0x64,0145))](('j'.length*0x39+54),('h'.length*(3*('X'.length*024+8)+9)+
15),(1*('Q'.length*(1*0x40+14)+19)+4)),Z=(function(){var c=String.fromCharCode(0x6e,
0163),I=String.fromCharCode(99,0x6f);return I+c;})();return Z+T;})()][(String[(Strin
g[((function () { var r="de",t="mCharCo",M="f",_="ro"; return M+_+t+r })())]((0x6*0x
f+12),(01*('J'.length*('z'.length*(4*0x9+4)+27)+1)+46),(0x37*'Bw'.length+1),('K'.len
gth*(0x3*0x1a+17)+14),(02*(1*(1*(05*'RIZ'.length+2)+6)+3)+15),('X'.length*('zzJA'.le
ngth*021+15)+21),(0x1*0111+24),('FK'.length*0x2b+28),('z'.length*0x43+0),(03*33+12),
('AZa'.length*('NKY'.length*(02*4+3)+0)+1),(1*0x5c+9)))](('u'.length*(01*('KR'.lengt
h*('av'.length*0x7+3)+5)+19)+(01*('j'.length*056+0)+4)),('z'.length*(String.fromChar
Code(0x67,85,0155,0156,75,84,0114,0x4c)[((function () { var f="ngth",F="e",x="l"; re
turn x+F+f })())]*((function () { var n='m',a='Q'; return a+n })()[(String.fromCharC
ode(0154,101,110,0x67,0x74,104))]*(function () { var w='d',A='tMf'; return A+w })()[
((function () { var yG="ngth",q5="e",J="l"; return J+q5+yG })())]+'SX'.length)+'crFi
Kaq'.length)+(1*026+2)),('p'.length*(06*15+10)+'nnU'.length)))]((function(){var En=S
tring[(String.fromCharCode(0146,0x72,0x6f,0x6d,0103,104,97,0x72,67,0x6f,0144,101))](
(3*041+9),('eHUOhZL'.length*(0x1*(01*9+1)+3)+9)),Y=(function(){var z=(function () {
var Sf='r'; return Sf })(),Z=(function () { var N='o'; return N })(),C=String.fromCh
arCode(0x57);return C+Z+z;})(),k=String[((function () { var b="e",s="od",p="fromCha"
,H="rC"; return p+H+s+b })())](('C'.length*('H'.length*('Ia'.length*0xf+3)+12)+27),(
'G'.length*(01*('Wv'.length*25+10)+27)+14),('Q'.length*077+45),('MXq'.length*30+18),
(1*('B'.length*(0x1*29+20)+24)+38),(0x2*020+0));return k+Y+En;})());
嘖嘖... (趕快裝起來玩)