getOS()

getOS.js

function getOS() {
    var os = [
            ['Windows 3.11', /Win16/i],
            ['Windows 95', /(Windows 95)|(Win95)|(Windows_95)/i],
            ['Windows 98', /(Windows 98)|(Win98)/i],
            ['Windows 2000', /(Windows NT 5.0)|(Windows 2000)/i],
            ['Windows XP', /(Windows NT 5.1)|(Windows XP)/i],
            ['Windows Server 2003', /(Windows NT 5.2)/i],
            ['Windows Vista', /(Windows NT 6.0)/i],
            ['Windows 7', /(Windows NT 6.1)/i],
            ['Windows NT 4.0', /(Windows NT 4.0)|(WinNT4.0)|(WinNT)|(Windows NT)/i],
            ['Windows ME', /Windows ME/i],
            ['Windows', /Windows/i],
            ['Open BSD', /OpenBSD/i],
            ['Sun OS', /SunOS/i],
            ['Linux', /(Linux)|(X11)/i],
            ['Mac OS X Tiger', /(Mac OS X 10.4)/i],
            ['Mac OS X Leopard', /(Mac OS X 10.5)/i],
            ['Mac OS X Snow Leopard', /(Mac OS X 10.6)/i],
            ['Mac OS', /(Mac_PowerPC)|(Macintosh)/i],
            ['QNX', /QNX/i],
            ['BeOS', /BeOS/i],
            ['OS/2', /OS\/2/i],  
        ],
        ua = navigator.userAgent;
    for (var i=0, l=os.length; i<l; i++) {
        if (os[i][1].test(ua)) {
            return os[i][0];
        }
    }
    return navigator.oscpu || '';
}