http://www.javascript-source.com/
混淆前
复制 
保存//detect which browser is used
var detect = navigator.userAgent.toLowerCase();
var OS,browser,version,total,thestring;
if (checkIt('konqueror'))
{
browser = "Konqueror";
OS = "Linux";
}
else if (checkIt('opera')) browser = "Opera"
else if (checkIt('msie')) browser = "Internet Explorer"
else if (!checkIt('compatible'))
{
browser = "Netscape Navigator"
version = detect.charAt(8);
}
else browser = "An unknown browser";
//version of browser
if (!version) version = detect.charAt(place + thestring.length);
//client OS
if (!OS)
{
if (checkIt('linux')) OS = "Linux";
else if (checkIt('x11')) OS = "Unix";
else if (checkIt('mac')) OS = "Mac"
else if (checkIt('win')) OS = "Windows"
else OS = "an unknown operating system";
}
//check the string
function checkIt(string)
{
place = detect.indexOf(string) + 1;
thestring = string;
return place;
}
混淆后:
复制 保存var e=navigator.userAgent.toLowerCase();var f,b,c,total,d;if(a('konqueror')){b="Konqueror";f="Linux";};else if(a('opera'))b="Opera";else if(a('msie'))b="Internet Explorer";else if(!a('compatible')){b="Netscape Navigator";c=e.charAt(8);};else b="An unknown browser";if(!c)c=e.charAt(g+d.length);if(!f){if(a('linux'))f="Linux";else if(a('x11'))f="Unix";else if(a('mac'))f="Mac";else if(a('win'))f="Windows";else f="an unknown operating system";};function a(string){g=e.indexOf(string)+1;d=string;return g;};