js判断操作系统类型

function getOSName() {
    var userAgent = navigator.userAgent;
    var isMac = (navigator.platform == "Mac68K") || (navigator.platform == "MacPPC") || (navigator.platform == "Macintosh") || (navigator.platform == "MacIntel");
    if (isMac) return "Mac";
    
    var isWin = (navigator.platform == "Win32") || (navigator.platform == "Windows");
    var isUnix = (navigator.platform == "X11") && !isWin && !isMac;
    if (isUnix) return "Unix";
    
    var isLinux = (String(navigator.platform).indexOf("Linux") > -1);
    if (isLinux) return "Linux";
   
    if (isWin) {
        var findFlag = userAgent.indexOf("Windows NT 5.0") > -1 || userAgent.indexOf("Windows 2000") > -1;
        if (findFlag) return "Win2000";
        var findFlag = userAgent.indexOf("Windows NT 5.1") > -1 || userAgent.indexOf("Windows XP") > -1;
        if (findFlag) return "WinXP";
        var findFlag = userAgent.indexOf("Windows NT 5.2") > -1 || userAgent.indexOf("Windows 2003") > -1;
        if (findFlag) return "Win2003";
        var findFlag= userAgent.indexOf("Windows NT 6.0") > -1 || userAgent.indexOf("Windows Vista") > -1;
        if (findFlag) return "WinVista";
        var findFlag = userAgent.indexOf("Windows NT 6.1") > -1 || userAgent.indexOf("Windows 7") > -1;
        if (findFlag) return "Win7";
        var findFlag = userAgent.indexOf("Windows NT 6.2") > -1 || userAgent.indexOf("Windows 8") > -1;
        if (findFlag) return "Win8";
        var findFlag = userAgent.indexOf("Windows NT 6.3") > -1 || userAgent.indexOf("Windows 8.1") > -1;
        if (isWifindFlagn8_1) return "Win8.1";
        var findFlag = userAgent.indexOf("Windows NT 6.4") > -1 || userAgent.indexOf("Windows 10") > -1;
        if (isWifindFlagn8_1) return "Win10";
        return 'win';
    }

    return "other";
}