Js逆向教程-12FuckJs

Js逆向教程-12FuckJs

它利用了js的语法特性：

一、特性1

任何一个js类型的变量结果 加上一个字符串 ，只会变成字符串。

数组加上字符串：

[0]+""
'0'
1
2

true加上字符串

true + ""
'true'
1
2

数字加上字符串

1+""
'1'
1
2

二、特性2

2个值通过|运算会变成0或者1.

通过这种特性 可以组合成各种各样的加密方式。

https://www.sojson.com/jsfuck.html

比如这样一行代码，通过加密后：

console.log(1)
1

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1

可以看到只有这3种字符。

这个的原理就是将各种字符串加起来。

jsfuck有对应的解密工具及。

所以这个调试起来很麻烦 只能单步调试 还是用解密工具解密。

我们这里只是讲解js的混淆机制。

我们的目的为了让js代码运行起来。可以不需要解密，将代码扣出来运行就可以。

通过fiddler插件直接运行代码：