JS逆向 | JSF*ck，这个看着头大的加密其实很简单

又到练手的时间了，今天聊一下 JSFuck 

我遇到过有两款网站用的就是 JSFuck 加密的，这个转换风格第一次遇到的时候内心OS就和这个名字一样。

大家先看看下面的图，一句简单的 hello world 就可以转化为近 5w 字符，看着就头大：

JSFuck是什么？

在讲解决方案之前，我们先来聊聊 JSFuck 是啥？

下面这个网站是 JSFuck 的官网：

http://www.jsfuck.com/

我们可以使用它对我们原有的 JS 代码进行编码风格上的转换。

JSFuck 是使用 [、]、(、)、! 和 + 六种字符来表示原有的字符的，就像下面这样的对应关系：

false       =>  ![]true        =>  !![]undefined   =>  [][[]]NaN         =>  +[![]]0           =>  +[]1           =>  +!+[]2           =>  !+[]+!+[]10          =>  [+!+[]]+[+[]]Array       =>  []Number      =>  +[]String      =>  []+[]Boolean     =>  ![]

当然还有更多的对应关系没有列出来，但是这并不重要，我们只需要知道 JSFuck 为啥长这样就可以了，更多知识可以加群讨论，接下来我们实战走一波，直接上解决方案。

如何在实战中处理 JSFuck?

JSFuck 的处理方法有以下几种：

document.write(xxx)alert(xxx)console.log(xxx)

这里的 xxx 指的就是 JSFuck 的内容，我们拿个例子测试一下。

这里本来想拿某文书网的 JSFuck 实战的，但是自从某文书网下了瑞数之后，整个网站频繁瘫痪，正常访问都是 502 。

所以这里用另一个例子演示一下：

复制 JSFuck ，打开 开发者模式，切换至 Console 选项卡，输入下面的内容并执行：

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执行结果如下：

这里看到提示Cannot read property 'attr' of null 

不管他，我们注意到右手边的vm87:1, 点进去看看：

这里就是浏览器为我们还原的代码了，用其他的方法也是同样的效果。

本文完。

欢迎大家提供更多 JSFuck 的案例，本文测试的 JS 已经上传至 Github , 后台回复

「 js逆向 」

即可获取地址