为什么这个能出来 hello world 呢？

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World

hello

出来

呢

7 replies • 2017-08-29 09:16:23 +08:00

coderluan

Aug 28, 2017

这个就是一堆 0 和 1，一堆 0 和 1 能出 hello world 你应该知道的。

yufz

Aug 28, 2017

JSFuck

zj299792458

Aug 28, 2017 via iPhone

这啥语言

misaka20038numbe

Aug 28, 2017

(!![]+[])[+!![]] = ('true')[1] = r
([][[]]+[])[!+[]+!![]+!![]] = ('undefined')[3] = e
([]+[]['sort']['constructor']('return location')()) = 'https://www.v2ex.com/t/386264#reply3'
[]['sort']['constructor']('return escape')()('[') = %5B
[]['sort']['constructor']('return unescape')()('%77') = 'w'
其他同理
([]+[]['sort']['constructor']('return location')())[0]+'ello '+[]['sort']['constructor']('return unescape')()('%77')+'orld'+[]['sort']['constructor']('return unescape')()('%21')
=
([]+[]['sort']['constructor']('return location')())[0]+'ello '+'w'+'orld'+'!'
=
'h'+'ello '+'w'+'orld'+'!'

jevirs

Aug 28, 2017

[] == ![]
// true

因缺斯汀

TakWolf

Aug 28, 2017

http://www.jsfuck.com/

zael

Aug 29, 2017

@TakWolf
@jinyang656 还有这样的网站，挺好玩的，不过

```
false => ![]
true => !![]
undefined => [][[]]
NaN => +[![]]
0 => +[]
1 => +!+[]
2 => !+[]+!+[]
10 => [+!+[]]+[+[]]
Array => []
Number => +[]
String => []+[]
Boolean => ![]
Function => []["filter"]
eval => []["filter"]["constructor"]( CODE )()
window => []["filter"]["constructor"]("return this")()
```

这东西为啥浏览器会认呢？