仅用[]()+!等符号就足以实现几乎任意Javascript代码

(NaN+[]["filter"])[11],
! window["atob"]("If")[0],
" ("").fontcolor()[12],
# window["atob"]("0iN")[1],
$ window["atob"]("0iT")[1],
% window["atob"]("0iW")[1],
& window["atob"]("0ia")[1],
window["atob"]("0if")[1],
( (false+[]["filter"])[20],
) (false+[]["filter"])[21],
* window["atob"]("0ir")[1],
+ window["atob"]("0it")[1],
, window["atob"]("0iy")[1],
- (NaN+window["Date"]())[31],
. window["atob"]("1i4")[1],
/ (true+("")["sub"]())[10],
0-9 ignored*/ ,,,,,,,,,,
: window["Date"]()[21],
; window["atob"]("O0")[0],
< ("")["sub"]()[0],
= ("").fontcolor()[11],
> ("")["sub"]()[10],
? window["atob"]("0j9")[1],
@ window["atob"]("00A")[1],
A (+[]+[]["constructor"])[10],
B (+[]+(false)["constructor"])[10],
C window["atob"]("00N")[1],
D window["btoa"](00)[1],
E window["btoa"](01)[2],
F (0+[]["filter"]["constructor"])[10],
G window["btoa"]("0f")[1],
H window["btoa"]("0t")[1],
I ("Infinity")[0],
J window["atob"]("00r")[1],
K window["btoa"]("(")[0],
L window["btoa"]("/")[0],
M window["btoa"](0)[0],
N ("NaN")[0],
O window["btoa"](8)[0],
P window["btoa"]("<")[0],
Q window["btoa"]("a")[1],
R window["atob"]("01I")[1],
S window["btoa"]("I")[0],
T window["btoa"]("N")[0],
U window["atob"]("01W")[1],
V window["atob"]("01a")[1],
W (true+window)[12],
X window["atob"]("01i")[1],
Y window["btoa"]("a")[0],
Z window["btoa"]("f")[0],
[ (undefined+[]["filter"])[33],
\ window["atob"]("01y")[1],
] (true+[]["filter"])[40],
^ window["atob"](014)[1],
_ window["atob"](018)[1],
` window["atob"]("02A")[1],
a ("false")[1],
b (window+[])[2],
c ([]["filter"]+[])[3],
d ("undefined")[2],
e ("true")[3],
f ("false")[0],
g ([]+("")["constructor"])[14],
h window["atob"]("aN")[0],
i ([false]+undefined)[10],
j (window+[])[3],
k window["atob"]("a0")[0],
l ("false")[2],
m (Number+[])[11],
n ("undefined")[1],
o (true+[]["filter"])[10],
p window["atob"]("cN")[0],
q window["atob"]("cf")[0],
r ("true")[1],
s ("false")[3],
t ("true")[0],
u ("undefined")[0],
v (0+[]["filter"])[30],
w ([]["sort"]["call"]()+[])[13],
x window["atob"]("eN")[0],
y (NaN+[Infinity])[10],
z window["atob"]("et")[0],
{ (NaN+[]["filter"])[21],
| window["atob"]("03y")[1],
} (NaN+[]["filter"])[41],
' window["atob"](234)[1]