用户代理字符串

safari: 2003年，Apple公司发布自己的Web浏览器，名字为Safari。safari的呈现引擎叫WebKit,是Linux平台中Konqueror浏览器的呈现引擎KHTML的一个分支。几年后，WebKit独立出来专注于呈现引擎的开发
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/604.5.6 (KHTML, like Gecko) Version/11.0.3 Safari/604.5.6

chrome: 谷歌公司的Chrome浏览器以WebKit作为呈现引擎，但使用了不同的JS引擎
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

识别代码

  1. var client = function() {
  2.     // 呈现引擎
  3.     var engine = {
  4.         ie: 0,
  5.         gecko: 0,
  6.         webkit: 0,
  7.         khtml: 0,
  8.         opera: 0,
  9.         // 完整的版本号
  10.         ver: null
  11.     };
  12.     // 浏览器
  13.     var browser = {
  14.         ie: 0,
  15.         firefox: 0,
  16.         safari: 0,
  17.         konq: 0,
  18.         opera: 0,
  19.         chrome: 0,
  20.         ver: null
  21.     };
  22.     // 平台、设备和操作系统
  23.     var system = {
  24.         win: false,
  25.         mac: false,
  26.         xll: false,    // unix
  27.         // 移动设备
  28.         iphone: false,
  29.         ipod: false,
  30.         ipad: false,
  31.         ios: false,
  32.         android: false,
  33.         nokiaN: false,
  34.         winMobile: false,
  36.         // 游戏系统
  37.         wii: false,
  38.         ps: false
  39.     };
  40.     // 检查呈现引擎和浏览器
  41.     var ua = navigator.userAgent;
  42.     if(window.opera){
  43.         engine.ver = browser.ver = window.opera.version();
  44.         engine.opera = browser.opera = parseFloat(engine.ver);
  45.     } else if (/AppleWebKit\/(\S+)/.test(ua)){
  46.         engine.ver = RegExp["$1"];
  47.         engine.webkit = parseFloat(engine.ver);
  49.         // 确定是Chrome还是Safari
  50.         if(/Chrome\/(\S+)/.test(ua)){
  51.             browser.ver = RegExp["$1"];
  52.             browser.chrome = parseFloat(browser.ver);
  53.         }else if (/Version\/(\S+)/.test(ua)){
  54.             browser.ver = RegExp["$1"];
  55.             browser.safari = parseFloat(browser.ver);
  56.         }else {
  57.             // 近似地确定版本号
  58.             var safariVersion = 1;
  59.             if(engine.webkit < 100){
  60.                 safariVersion = 1;
  61.             }else if(engine.webkit < 312){
  62.                 safariVersion = 1.2;
  63.             }else if(engine.webkit < 412){
  64.                 safariVersion = 1.3;
  65.             }else{
  66.                 safariVersion = 2;
  67.             }
  69.             browser.safari = browser.ver = safariVersion;
  70.         }
  71.     } else if (/KHTML\/(\S+)/.test(ua) || /Konqueror\/([^;]+)/.test(ua)) {
  72.         engine.ver = browser.ver = RegExp["$1"];
  73.         engine.khtml = browser.konq = parseFloat(engine.ver);
  74.     } else if(/rv:{[^\)]+}\) Gecko\/\d{8}/.test(ua))  {
  75.         engine.ver = RegExp["$1"];
  76.         engine.gecko = parseFloat(engine.ver);
  78.         // 确定是不是Firefox
  79.         if(/Firefox\/(\S+)/.test(ua)){
  80.             browser.ver = RegExp["$1"];
  81.             browser.firefox = parseFloat(browser.ver);
  82.         }
  83.     }else if(/MSIE ([^;]+)/.test(ua)){
  84.         engine.ver = browser.ver = RegExp["$1"];
  85.         engine.ver = browser.ie = parseFloat(engine.ver);
  86.     }
  88.     // 检测浏览器
  89.     browser.ie = engine.ie;
  90.     browser.opera = engine.opera;
  92.     // 检测平台
  93.     var p = navigator.platform;
  94.     system.win = p.indexOf("Win") == 0;
  95.     system.mac = p.indexOf("Mac") == 0;
  96.     system.xll = (p == "Xll") || (p.indexOf("Linux") == 0);
  97.     // 检测Windows操作系统
  98.     if(system.win){
  99.         if(/Win(?:dows )?([^do]{2})\s?(\d+\.\d+)?/.test(ua)){
  100.             if(RegExp["$1"] == "NT"){
  101.                 switch(RegExp["$2"]){
  102.                     case "5.0":
  103.                         system.win = "2000";
  104.                         break;
  105.                     case "5.1":
  106.                         system.win = "XP";
  107.                         break;
  108.                     case "6.0":
  109.                         system.win = "Vista";
  110.                         break;
  111.                     case "6.1":
  112.                         system.win = "7";
  113.                         break;
  114.                     default:
  115.                         system.win = "NT";
  116.                         break;
  117.                 }
  118.             } else if (RegExp["$1"] == "9x"){
  119.                 system.win = "ME";
  120.             } else {
  121.                 system.win = RegExp["$1"];
  122.             }
  123.         }
  124.     }
  126.     // 移动设备
  127.     system.iphone = ua.indexOf("iphone") > -1;
  128.     system.ipod = ua.indexOf("ipod") > -1;
  129.     system.ipad = ua.indexOf("ipad") > -1;
  130.     system.nokiaN = ua.indexOf("NokiaN") > -1;
  132.     // window mobile
  133.     if(system.win == "CE"){
  134.         system.winMobile = system.win;
  135.     } else if (system.win == "Ph"){
  136.         if(/Window Phone OS (\d+.\d+)/.test(ua)){
  137.             system.win = "Phone";
  138.             system.winMobile = parseFloat(RegExp["$1"]);
  139.         }
  140.     }
  142.     // 检查IOS版本
  143.     if (system.mac && ua.indexOf("Mobile") > -1) {
  144.         if (/CPU (?:iPhone)?OS (\d+_\d+)/.test(ua)) {
  145.             system.ios = parseFloat(RegExp.$1.replace("_", "."));
  146.         } else {
  147.             system.ios = 2;    // 因为没有办法确定到底是什么版本，所以设置为更早的版本比较稳妥
  148.         }
  149.     }
  151.     // 检查Android版本
  152.     if (/Andriod (\d+\.\d+)/.test(ua)) {
  153.         system.andriod = parseFloat(RegExp.$1);
  154.     }
  156.     // 游戏系统
  157.     system.wii = ua.indexOf("Wii") > -1;
  158.     system.ps = /playstation/i.test(ua);
  160.     return {
  161.         engine: engine,
  162.         browser: browser,
  163.         system: system
  164.     };
  165. }();