24mail临时邮箱现启用了百度云5秒防护，抓包后发现是有Js计算的，其中有个"jschl-answer"的值是通过JS计算出来，还有其它两个值可以通过网页源码直接获取到！我抓包抓包的算取"jschl-answer"的JS如下，不知道是否正确！
setTimeout(function(){
var s,t,o,p,b,r,e,a,k,i,n,g,f, twBEldX={"Bizy":+((!+[]+!![]+[])+(+[]))};
t = document.createElement('div');
t.innerHTML="<a href='/'>x</a>";
t = t.firstChild.href;r = t.match(/https?:\/\//)[0];
t = t.substr(r.length); t = t.substr(0,t.length-1);
a = document.getElementById('jschl-answer');
f = document.getElementById('challenge-form');
;twBEldX.Bizy+=+((+!![]+[])+(+[]));twBEldX.Bizy-=+((+!![]+[])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]));twBEldX.Bizy+=+((!+[]+!![]+!![]+!![]+[])+(!+[]+!![]+!![]));a.value = parseInt(twBEldX.Bizy, 10) + t.length; '; 121'
f.submit();
}, 4000);
twBEldX.Bizy这个东西是随机变化的，我已经算出来了，但是t.length 这个我不知道怎么来的，还有'; 121' 这个有什么用呢？
这段代码： t = document.createElement('div');
t.innerHTML="<a href='/'>x</a>";
t = t.firstChild.href;r = t.match(/https?:\/\//)[0];
t = t.substr(r.length); t = t.substr(0,t.length-1);没明白什么意思，我看了下JS基本语法还是不会，可能太笨了吧！希望大神指导一下！
整个百度云防护页面的源码如下，真心求指点！懂的大神别笑语我哈！
<!DOCTYPE HTML>
<html lang="en-US">
<head>
<meta charset="UTF-8" />
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1" />
<meta name="robots" content="noindex, nofollow" />
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1" />
<title>安全检查中...</title>
<style type="text/css">
html, body {width: 100%; height: 100%; margin: 0; padding: 0;}
body {background-color: #ffffff; font-family: Helvetica, Arial, sans-serif; font-size: 100%;}
h1 {font-size: 1.5em; color: #404040; text-align: center;}
p {font-size: 1em; color: #404040; text-align: center; margin: 10px 0 0 0;}
#spinner {margin: 0 auto 30px auto; display: block;}
.attribution {margin-top: 20px;}
</style>
<script type="text/javascript">
//<![CDATA[
(function(){
var a = function() {try{return !!window.addEventListener} catch(e) {return !1} },
b = function(b, c) {a() ? document.addEventListener("DOMContentLoaded", b, c) : document.attachEvent("onreadystatechange", b)};
b(function(){
var a = document.getElementById('yjs-content');a.style.display = 'block';
setTimeout(function(){
var s,t,o,p,b,r,e,a,k,i,n,g,f, twBEldX={"Bizy":+((!+[]+!![]+[])+(+[]))};
t = document.createElement('div');
t.innerHTML="<a href='/'>x</a>";
t = t.firstChild.href;r = t.match(/https?:\/\//)[0];
t = t.substr(r.length); t = t.substr(0,t.length-1);
a = document.getElementById('jschl-answer');
f = document.getElementById('challenge-form');
;twBEldX.Bizy+=+((+!![]+[])+(+[]));twBEldX.Bizy-=+((+!![]+[])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]));twBEldX.Bizy+=+((!+[]+!![]+!![]+!![]+[])+(!+[]+!![]+!![]));a.value = parseInt(twBEldX.Bizy, 10) + t.length; '; 121'
f.submit();
}, 4000);
}, false);
})();
//]]>
</script>
</head>
<body>
<table width="100%" height="100%" cellpadding="20">
<tr>
<td align="center" valign="middle">
<div class="yjs-browser-verification yjs-im-under-attack">
<noscript><h1 data-translate="turn_on_js" style="color:#bd2426;">请打开游览器的javascript，然后刷新游览器</h1></noscript>
<div id="yjs-content" style="display:none">
<div>
<div class="bubbles"></div>
<div class="bubbles"></div>
<div class="bubbles"></div>
</div>
<h1><span data-translate="checking_browser">浏览器安全检查中…</span> chacuo.net.</h1>
<p data-translate="process_is_automatic"></p>
<p data-translate="allow_5_secs">还剩 5 秒…</p>
</div>
<form id="challenge-form" action="xcdn-cgixlxchk_jschl" method="get">
<input type="hidden" name="jschl_vc" value="b0020cb628b4424809d98b769a3a1f15"/>
<input type="hidden" name="pass" value="1467470151.618-+6YCymk1ay"/>
<input type="hidden" id="jschl-answer" name="jschl_answer"/>
</form>
</div>
<div class="attribution"><a href="http://su.baidu.com/" target="_blank" style="font-size: 12px;">百度云加速防护中</a></div>
</td>
</tr>
</table>
</body>
</html>
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