为啥写这篇
前几天瑞数获取到我的ip了，因为我忽略了webrtc。本文会对瑞数JS进行部分还原（没有控制流）。
拿到源码
直接从网页上拿到html和c3aqs9gktfr4.dfe1675.js，放到Hbuilder中，格式化长这个样子，切记不要删除任何东西（css和js）。搞完图片如下。
找到Eval
先别研究流程直接找到eval处，至于怎么找，你可以用rockswang大哥写的hook，也可以跟我一样打断点自己看。
你可以看到我标注出了ret，没错直接搜ret就行了，直接下断点。待执行的代码有定时器执行debugger，还有明显的debugger；
注意，我这是在不确定他是否验证了方法tostring后等于debugger的情况下直接替换（这是个错误的示范），人家有验证的。
给代执行的代码加断点。给_KaTeX parse error: Expected group after '_' at position 11: mU字符串改改，改成_̲mU=“debugger”+_$mU‘;
看eval出的代码
看图，长这个样子。是不是挺恶心的，上千行，别急。
初步还原
瑞数全局采用一个通用解密，为什么说通用凯撒解密？请看图，是不是很熟悉。
说白了就是移位，计算然后chartcode。不多说了继续看，一步步执行后你会看到这个字符串。解密后你会看到一个有554字符串的数组。
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是不是看到了本章我想提的canvas，看看下标是几，然后搜索下_KaTeX parse error: Expected group after '_' at position 28: …这个时候看一下是不是大量引用了_̲gh这个数组里面的值？大家自己写代码替换吧。咱们接着看还原后的（我直接给看我本地的有可能和上述代码不一致，勿怪）。
canvas指纹：
fonts指纹：
webrtc获取ip：
假如你不知道webrtc是个啥，请看我的测试代码。真实ip，给我安排的很明白。
最后呢，瑞数若干个版本就别想着破了，多难受。做过安卓逆向的知道有个so文件多恶心，自动化调用才是王道，当你把所有的验证点找到并hook掉，你就可以通杀瑞数。感觉对你有用，请移步微信公众号“编码天空”获取最新文章（CSDN上比较慢）。看成果图
更新速度还行，开了个单线程的爬虫去测试。代理质量高的情况下，能达到1万/每小时的抓取量。当然了你愿意加机器就是采集速度倍增。
（上图目的仅仅是为了测试而采集的裁判文书网详情页的数据，有需要捋捋思路的请关注公众号“编码天空”）