爬虫入门到放弃系列07：js混淆、eval加密、字体加密三大反爬技术

前言

如果再说IP请求次数检测、验证码这种最常见的反爬虫技术，可能大家听得耳朵都出茧子了。当然，也有的同学写了了几天的爬虫，觉得爬虫太简单、没有啥挑战性。所以特地找了三个有一定难度的网站，希望可以有兴趣的手动实践一下。

此篇文章只作知识扩展和思路引导，其中涉及的网站反爬技术，仅做技术学习探讨。

字体加密

字体加密总结成一句话：你看到的不是你看到的。

地址

猫眼电影：https://maoyan.com/films/343568

问题还原

最近的哥斯拉大战金刚看了没啊，好看不，评分高不高，票房多少了？让我们去猫眼看一看吧。

这一看问题就来了：为什么评分和票房在源码里都是"口口"？在页面中看到的评分和票房去哪儿了？

追根溯源

话不多说，先看源码：

看完更疑问了，这个&#x又是啥？这个其实是html中的转义序列，表示后面跟着的是十六进制，处理后在控制台打印一下，如图：

这些数字和票房目前是一分钱关系都没有。那就想办法让他们有所关联。

从网页中找到了以下代码：

其实这就是在css中使用@font-face通过woff文件自定义了字体，源码中的十六进制数字必须通过这个字体映射才能正确显示。就像UTF-8和GBK的关系，编码和解码一致才不会出现乱码。

这里我将woff字体文件下载到本地并用工具打开。

从网页上看到票房是5.74亿，这里就主要关注数字5。从上图可以看出5对应的是glyph11。

使用工具将woff文件转换成xml格式：

glyph11对应的是id=11的glyph，其对应的name为uniE8CD。接着在xml中找到uniE8CD对应的十六进制：

如图，uniE8CD对应的是0xe8cd，也就是说数字5对应的是0xe8cd，正是在控制台输出的第一个数字。

eval() & JS加密

js被加密后放在eval()中执行。如果想还原js，在开发者控制台使用console.log()输出解密后的js。因为不论是eval()还是log()，js解析执行最终都依赖于浏览器内核。

地址

TV猫：https://www.tvmao.com/program/CCTV

问题还原

在频道剧集页，分为早间、午间、晚间节目。如图：

在发起请求获取频道剧集数据的时候，发现返回内容只有早间节目数据，12点以后的剧集数据获取不到。

查看网页源码：

追根溯源

我们在控制台的请求中，搜索网页中的关键字"熊熊乐园"，害，果不其然，还真搜着了。

这个响应结果是一个数组，下标0代表标志位：1代表获取到了数据，0代表没有获取到数据；下标1是数据位，对应接口的返回数据。

解析此响应结果的代码比较繁杂，需要对多余内容进行替换。

代码如下：

其实上面代码它并不重要！！接着我们顺着网线去看他的请求部分：

从请求头中可以看出，请求就一个参数p，1、2、3… 整整186位，你看这个参数它又长悠长，像那寂寥的雨巷。虽然等不来那撑着油纸伞的姑娘，但是至少可以先看看这个参数p是怎么生成的。

在搜索框搜索api和pg关键字，找到下面代码：

别管其他，带有ajax字样十有八九就是ajax请求了，参数p的值是变量a，在生成变量a的代码处设置断点，点击页面中的"查看更多"按钮触发断点，接着进入A.d()方法：

往上翻，查看js上部分：

其实到这里就已经可以结束了，你看在d()中又调用了w()，w()也调用了A中其他方法，将这个js中方法调用链搞清楚，将每个方法代码都内联起来，最后计算出参数p，就可以了。

那么，说好的eval呢，说好的加密的js呢？

少侠莫慌，这就带您继续看下去。如果你仔细看，你就会发现上面的js的文件名是匿名/临时的，所以说这不是网站原有的js文件，而是浏览器内核解析后的js。

那该怎么找到原来的js文件？

不知少侠可知搜索功能，你看上面的js中有keyStr这个关键字，咱不妨搜索一波。

这不，如图，eval()有了，加密js也有了，拷贝成文本如下：

eval(function(h, b, i, d, g, f) {g = function(a) {return (a < b ? "" : g(parseInt(a / b))) + ((a = a % b) > 35 ? String.fromCharCode(a + 29) : a.toString(36))};if (!"".replace(/^/, String)) {while (i--) {f[g(i)] = d[i] || g(i)}d = [function(a) {return f[a]}];g = function() {return "\\w+"};i = 1}while (i--) {if (d[i]) {h = h.replace(new RegExp("\\b" + g(i) + "\\b","g"), d[i])}}return h
}('5 A={z:"1o+/=",1b:"1l=1k",J:j(a){5 b="";5 c,L,M,14,16,O,N;5 i=0;a=A.1g(a);1t(i<a.R){c=a.S(i++);L=a.S(i++);M=a.S(i++);14=c>>2;16=((c&3)<<4)|(L>>4);O=((L&15)<<2)|(M>>6);N=M&Q;9(1f(L)){O=N=18}K 9(1f(M)){N=18}b=b+y.z.C(14)+y.z.C(16)+y.z.C(O)+y.z.C(N)}8 b},H:j(a){a=a.1G();5 b=\'\';Z(5 i=0;i<a.R;i++){b+=y.1b[a.C(i)]}Z(5 i=0;i<a.R;i++){b+=y.z[a.C(i)]}8 b},1g:j(a){a=a.1B(/\\r\\n/g,"\\n");5 b="";Z(5 n=0;n<a.R;n++){5 c=a.S(n);9(c<P){b+=I.G(c)}K 9((c>1x)&&(c<1w)){b+=I.G((c>>6)|1q);b+=I.G((c&Q)|P)}K{b+=I.G((c>>12)|1p);b+=I.G(((c>>6)&Q)|P);b+=I.G((c&Q)|P)}}8 b},E:j(a){$(\':U[V="19"]\',a).10(A.J(\'l\'+$(".19",a).10()+\'o\'))},B:j(a){5 b=(1c 1d()).1i();9(a!=m)8 A.J(a+\'|\'+b);K 8 A.J(\'\'+b)},e:j(u){5 x=1;5 f=$(\'T\').13();5 a=f.W("U[11=\'1j\']");9(a!=m){x=2}K 9(u!=m){x=u}9(f==m)8 x;8 f.D(\'a\')},c:j(e){5 v;5 f=$(\'T\').13();9(f==m)8"";5 s=f.W("*[17=\'1m\']");9(s==m){v=f.W("U[11=\'1n\']");9(v==m)8"";v=e}v=s.D(\'Y\');8 v},d:j(p,h){5 v=A.w(h);5 a=$("1r.1s");5 x=a||p;9(a!=m){x=h||$("s.1h")}x=A.c();5 b=1c 1d();5 c=b.1u();5 d=b.1v();5 i=d==0?7:d;i=i*i;5 F=y.z.C(i);8 F+A.J(x+"|"+A.e(p))+v},w:j(v){5 t=$("1y");5 a="|";9(t==m){X="/"}K{X=v}5 r=A.J(a+k(X));8 r},s:j(a,b){5 c=y.z.C(1z);8 A.J(c+a)}};5 k=j(a){5 f=$(\'T\').13();9(f==m)8"";5 b=f.D(\'Y\');9(b==m)f.D(\'Y\',a);8 f.D(\'q\')};$(j(){5 b=$(\'<U 17="1A" V="1a"/>\');b.10(A.B());$(\'T[V="1C"]\').1D(b);$(\'a[11^="1E"]\').1F(j(){5 a=$(y).D("1e")+"&1a="+1H(A.B());$(y).D("1e",a)})});', 62, 106, "|||||var|||return|if||||||||||function|||undefined||||||||||||this|_keyStr|||charAt|attr|||fromCharCode||String||else|chr2|chr3|enc4|enc3|128|63|length|charCodeAt|form|input|name|find|tl|id|for|val|class||first|enc1||enc2|type|64|ed|ek|_keyStr2|new|Date|href|isNaN|_C|fix1|getTime|baidu|DVGO|KQMFS|submit|qq|ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789|224|192|div|fix|while|getUTCDate|getDay|2048|127|head|37|hidden|replace|frmlogin|append|by|each|toString|encodeURIComponent".split("|"), 0, {}))

在控制台中将eval()中的加密js使用console.log()打印出来，结果和之前的匿名js一样。

如图：

setCookie & 混淆加密

其实setCookie是一个js混淆加密，但是我之所以叫他setCookie，是因为它的代码起点和核心围绕着一个setCookie函数。

地址

智联招聘：https://jobs.zhaopin.com/beijing

问题还原

当对上面网址发起请求，发现返回的网页内容是一堆看不懂的"乱码"。

如图：

这里我把响应内容复制了出来，供大家阅读。

<html><script src="//aeu.alicdn.com/waf/antidomxss.js"></script><script>
var arg1='7CF8FE6084F244597FE93D42AFEB6C2ED7029D82';
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function reload(x) {setCookie("acw_sc__v2", x);document.location.reload();}
</script></html>

追根溯源

这个是不是看起来比eval()还要头大一些，密密麻麻的都是16进制数。别慌，让我来给他美化一波！！

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}()) {document[_0x55f3('0x33', 'V%YR')](_0x55f3('0x34', 'yApz'), l, ![]);
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}function reload(x) {setCookie("acw_sc__v2", x);document.location.reload();
} < /script></html >

上面是格式后的js。为什么叫混淆函数，一是使用了十六进制数混淆，二是有用的代码的确不多。我们从最后两个函数看起，一个是reload(x)，一个是setCookie()。

reload()调用setCookie(),生成key=acw_sc__v2，value=x的cookie，然后通过document.location.reload()来刷新网页。那么关键来了，到底是谁生成x并调用的reload()？

我们搜索上面的代码，发现了以下三行核心代码：

var _0x23a392 = arg1[_0x55f3('0x19', 'Pg54')]();
arg2 = _0x23a392[_0x55f3('0x1b', 'z5O&')](_0x5e8b26);
setTimeout('reload(arg2)', 0x2);

这三行代码中arg1是个字符串，_0x55f3是个方法名，arg2就是cookie中的value，理清之间的调用关系计算出arg2。

这个混淆js是非常有意思的，涉及的js基础知识比较多，想要搞定主要还是依赖于debug和控制台。

结语

本文主要以技术介绍为主，也不难看出，做爬虫还是需要有一丢丢丢前端功底的。如果你问我，既不想搞懂还想解决js加密行不行啊？我只想告诉你：程序员不能说不行。方法是有的，但是终究需要依赖第三方服务或者插件。

当然，很多网站都会有自己独特的js加密方式，反爬技术的花样也是层出不穷。有兴趣的也可以一起探讨学习。

爬虫基础篇完结于此。开始着手准备爬虫框架scrapy系列的写作了，期待下一次相遇。

95后小程序员，写的都是日常工作中的亲身实践，置身于初学者的角度从0写到1，保证能够真正让大家看懂。

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