Javascript实现检测客户端类型代码封包

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

(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(?:dows )?([^do]{2})s?(d+.d+)?/.test(ua)){
      if(RegExp["$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 (?:iPhone )?OS (d+.d+)/.test(ua)){
      system.ios = parseFloat(RegExp["$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;
})();

再给大家一个简单点的实例：判断windows、linux、android