/**
 * Author: laixiangran.
 * Created by laixiangran on 2015/12/02.
 * 检测访问网页的浏览器呈现引擎、平台、Windows操作系统、移动设备和游戏系统
 * ********************************************************************
 * 各版本浏览器在windows10.0下的用户代理字符串：
 * Google Chrome 45.0.2454.85 —— "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.85 Safari/537.36"
 * Opera 31.0.1889.174 —— "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.155 Safari/537.36 OPR/31.0.1889.174"
 * Microsoft Edge —— "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.10240"
 * Firefox 40.0.3 —— "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0"
 * Internet Explorer 11+ —— "Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; .NET4.0C; .NET4.0E; .NET CLR 2.0.50727; .NET CLR 3.0.30729; .NET CLR 3.5.30729; rv:11.0) like Gecko"
 * Internet Explorer 10- —— "Mozilla/5.0 (compatible; MSIE x.0; Windows NT 10.0; WOW64; Trident/8.0; .NET4.0C; .NET4.0E; .NET CLR 2.0.50727; .NET CLR 3.0.30729; .NET CLR 3.5.30729)"
 */
(function(){

  window.iClient = {};

  //呈现引擎信息
  var engine = {
    //呈现引擎
    ie: 0,
    gecko: 0,
    webkit: 0,
    khtml: 0,
    opera:0,
    //具体版本号
    ver: null
  };

  var browser = {
    //浏览器
    ie: 0,
    edge: 0,
    firefox: 0,
    safari: 0,
    konq: 0,
    opera: 0,
    chrome: 0,
    //具体版本号
    ver: null
  };

  //平台、设备和操作系统
  var system = {
    win: false,
    mac: false,
    unix: false,

    //移动设备
    iphone: false,
    ipod: false,
    ipad: false,
    ios: false,
    android: false,
    nokiaN: false,
    winMobile: false,

    //游戏系统
    wii: false, //任天堂
    ps: false  //Playstation3
  };

  //获取浏览器的用户代理字符串
  var ua = window.navigator.userAgent;

  //检测呈现引擎和浏览器
  //检测Presto内核的Opera浏览器
  if(window.opera){
    engine.ver = browser.ver = window.opera.version();
    engine.opera = browser.opera = parseFloat(engine.ver);
  }
  //检测WebKit 用代理字符串中的"AppleWebKit"进行检测
  else if(/AppleWebKit\/(\S+)/.test(ua)){
    engine.ver = RegExp["$1"];
    engine.webkit = parseFloat(engine.ver);
    //确定Microsoft Edge
    if(/Edge\/(\S+)/.test(ua)){
      browser.ver = RegExp["$1"];
      browser.edge = parseFloat(browser.ver);
    }
    //确定WebKit内核Opera
    else if(/OPR\/(\S+)/.test(ua)){
      browser.ver = RegExp["$1"];
      browser.opera = parseFloat(browser.ver);
    }
    //确定Chrome
    else if(/Chrome\/(\S+)/.test(ua)){
      browser.ver = RegExp["$1"];
      browser.chrome = parseFloat(browser.ver);
    }
    //确定Safari
    else if(/Version\/(\S+)/.test(ua)){
      browser.ver = RegExp["$1"];
      browser.safari = parseFloat(browser.ver);
    }else{
      //近似的确定版本号
      var safariVersion = 1;
      if(engine.webkit < 100){
        safariVersion = 1;
      }else if(engine.webkit <312){
        safariVersion = 1.2;
      }else if(engine.webkit < 412){
        safariVersion = 1.3;
      }else{
        safariVersion = 2;
      }
      browser.ver = browser.safari = safariVersion;
    }
  }
  //检测KHTML 用于Konqueror3.1及更早版本中不包含KHTML的版本，故而就要使用Konqueror的版本来代替
  else if(/KHTML\/(\S+)/.test(ua) || /Konqueror\/(\S+)/.test(ua)){
    engine.ver = browser.ver = RegExp["$1"];
    engine.khtml = browser.konq = parseFloat(engine.ver);s
  }
  //检测Gecko 其版本号在字符串"rv:"的后面
  else if(/rv:([^\)]+)\) Gecko\/\d{8}/.test(ua)){
    engine.ver = RegExp["$1"];
    engine.gecko = parseFloat(engine.ver);
    //确定Firefox
    if(/Firefox\/(\S+)/.test(ua)){
      browser.ver = RegExp["$1"];
      browser.firefox = parseFloat(browser.ver);
    }
  }
  //检测IE
  else if(/MSIE ([^;]+)/.test(ua) || /rv:([^\)]+)\) like Gecko/.test(ua)){
    engine.ver = browser.ver = RegExp["$1"];
    engine.ie = browser.ie = parseFloat(engine.ver);
  }

  //获取平台或者操作系统信息,可能的值：win32、win64、MacPPC、MacIntel、Xll、Linux i686
  var p = window.navigator.platform;

  //检测平台
  system.win = p.indexOf("Win") == 0;
  system.mac = p.indexOf("Mac") == 0;
  system.unix = (p == "Xll'") || (p.indexOf("Linux") == 0);

  //检测Windows操作系统
  if(system.win){
    if(/Win("$1"] == "NT"){
        switch(RegExp["$2"]){
          case "5.0":
            system.win = "2000";
            break;
          case "5.1":
            system.win = "XP";
            break;
          case "6.0":
            system.win = "Vista";
            break;
          case "7":
            system.win = "7";
            break;
          case "8":
            system.win = "8";
            break;
          case "8.1":
            system.win = "8.1";
            break;
          case "10.0":
            system.win = "10.0";
            break;
          default:
            system.win = "NT";
            break;
        }
      }
    }
  }

  //移动设备
  system.iphone = ua.indexOf("iPhone") > -1;
  system.ipod = ua.indexOf("iPod") > -1;
  system.ipad = ua.indexOf("iPad") > -1;
  system.nokiaN = ua.indexOf("NokiaN") > -1;

  //window mobile
  if(system.win == "CE"){
    system.winMobile = system.win;
  }else if(system.win == "Ph"){
    if(/Windows Phone OS (\d+.\d+)/.test(ua)){
      system.win = "Phone";
      system.winMobile = parseFloat(RegExp["$1"]);
    }
  }

  //检测iOS版本
  if(system.mac && ua.indexOf("Mobile") > -1){
    if(/CPU ("$1"].replace("_","."));
    }else{
      system.ios = 2; //不能真正检测出来，所以只能猜测
    }
  }

  //检测安卓版本
  if(/Android (\d+.\d+)/.test(ua)){
    system.android = parseFloat(RegExp["$1"]);
  }

  //检测游戏系统
  system.wii = ua.indexOf("wii") > -1;
  system.ps = /playstation/i.test(ua);

  window.iClient.engine = engine;
  window.iClient.browser = browser;
  window.iClient.system = system;
})();

<html>
<head>
<title>判断操作系统</title>
<script type="text/javascript">
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"); 
if (isMac) return "Mac"; 
var isUnix = (navigator.platform == "X11") && !isWin && !isMac; 
if (isUnix) return "Unix"; 
var isLinux = (String(navigator.platform).indexOf("Linux") > -1); 

var bIsAndroid = sUserAgent.toLowerCase().match(/android/i) == "android";
if (isLinux) {
if(bIsAndroid) return "Android";
else return "Linux"; 
}
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"; 
} 
return "other"; 
} 
document.writeln("您的操作系统是：" + detectOS()); 
alert(detectOS());
</script>
</head>
<body>
</body>
</html>