JaveScript detect platform and cpu class.

platform.js

function detectOS() {
    var sUserAgent = navigator.userAgent;

    var isWin = (navigator.platform === "Win32") || (navigator.platform === "Windows");
    var isMac = (navigator.platform === "Mac68K") || (navigator.platform === "MacPPC") || (navigator.platform === "Macintosh") || (navigator.platform === "MacIntel");
    var isIpad = sUserAgent.match(/ipad/i) === "ipad";
    // var isIphoneOS = sUserAgent.match(/iphone os/i) === "iphone os";
    var isUnix = (navigator.platform === "X11") && !isWin && !isMac;
    var isLinux = (String(navigator.platform).indexOf("Linux") > -1);
    var isAndroid = sUserAgent.toLowerCase().match(/android/i) === "android";
    var isCE = sUserAgent.match(/windows ce/i) === "windows ce";
    var isWM = sUserAgent.match(/windows mobile/i) === "windows mobile";
    if (isMac) {
        return "Mac";
    }
    if (isUnix) {
        return "Unix";
    }
    if (isLinux) {
        if (isAndroid) {
            return "Android";
        } else {
            return "Linux";
        }
    }
    if (isCE || isWM) {
        return 'wm';
    }

    if (isWin) {
        var isWin2K = sUserAgent.indexOf("Windows NT 5.0") > -1 || sUserAgent.indexOf("Windows 2000") > -1;
        if (isWin2K) {
            return "Win2000";
        }
        var isWinXP = sUserAgent.indexOf("Windows NT 5.1") > -1 || sUserAgent.indexOf("Windows XP") > -1;
        if (isWinXP) {
            return "WinXP";
        }
        var isWin2003 = sUserAgent.indexOf("Windows NT 5.2") > -1 || sUserAgent.indexOf("Windows 2003") > -1;
        if (isWin2003) {
            return "Win2003";
        }
        var isWinVista = sUserAgent.indexOf("Windows NT 6.0") > -1 || sUserAgent.indexOf("Windows Vista") > -1;
        if (isWinVista) {
            return "WinVista";
        }
        var isWin7 = sUserAgent.indexOf("Windows NT 6.1") > -1 || sUserAgent.indexOf("Windows 7") > -1;
        if (isWin7) {
            return "Win7";
        }
        var isWin8 = sUserAgent.indexOf("Windows NT 6.2") > -1 || sUserAgent.indexOf("Windows 8") > -1;
        if (isWin8) {
            return "Win8";
        }
        var isWin8_1 = sUserAgent.indexOf("Windows NT 6.3") > -1 || sUserAgent.indexOf("Windows 8.1") > -1;
        if (isWin8_1) {
            return "Win8.1";
        }
        var isWin10 = sUserAgent.indexOf("Windows NT 6.4") > -1 || sUserAgent.indexOf("Windows NT 10.0") > -1 || sUserAgent.indexOf("Windows 10") > -1;
        if (isWin10) {
            return "Win10";
        }
    }
    return "other";
}
function detectCPUClass() {
   var agent = navigator.userAgent.toLowerCase();
   return (agent.indexOf("win64") >= 0 || agent.indexOf("wow64") >= 0 || agent.indexOf("x86_64") >= 0) ? "x64" : "x86";
}