http://www.javascript-source.com/
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//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:
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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;};