//完整的用户代理字符串检测脚本
      var client = function () {

          //呈现引擎
          var engine = {
              ie: 0,
              gecko: 0,
              webkit: 0,
              khtml: 0,
              opera: 0,
              //完整的版本号
              ver: null
          };


          //浏览器
          var browser = {
              //主要浏览器
              ie: 0,
              firefox: 0,
              safari: 0,
              konq: 0,
              opera: 0,
              chrome: 0,
              //具体的版本号
              ver: null
          };


          //平台,设备的操作系统
          var system = {
              win: false,
              mac: false,
              xll: false,
              //移动设备
              iphone: false,
              ipod: false,
              ipad: false,
              ios: false,
              android: false,
              nokiaN: false,
              winMobile: false,
              //游戏系统
              will: false,
              ps: false
          };

          //检测呈现引擎和浏览器
          var ua = navigator.userAgent;
          if (window.opera) {
              engine.ver = browser.ver = window.opera.version();
              engine.opera = browser.opera = parseFloat(engine.ver);
          } else if (/AppleWebKit\/(\S+)/.test(ua)) {
              engine.ver = RegExp.$1;
              engine.webkit = parseFloat(engine.ver);
              //确定是chrome还是Safari
              if (/Chrome\/(\S+)/.test(ua)) {
                  browser.ver = RegExp.$1;
                  browser.chrome = parseFloat(browser.ver);
              } else {
                  //近似地确定版本号
                  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.safari = browser.ver = safariVersion;
              }
          } else if (/KHTML\/(\S+)/.test(ua) || /Konqueror\/([^;]+)/.test(ua)) {
              engine.ver = browser.ver = RegExp.$1;
              engine.khtml = browser.konq = parseFloat(engine.ver);
          } else if (/rv:([^\)]+)\) Gecko\/\d{8}/.test(ua)) {
              engine.ver = RegExp.$1;
              engine.gecko = parseFloat(engine.ver);
              //确定是不是firefox
              if (/Firefox\/(\S+)/.test(ua)) {
                  browser.ver = RegExp.$1;
                  browser.firefox = parseFloat(browser.ver);
              }
          } else if (/MSIE ([^;]+)/.test(ua)) {
              engine.ver = browser.ver = RegExp.$1;
              engine.ie = browser.ie = parseFloat(engine.ver);
          }
//检测浏览器
          browser.ie = engine.ie;
          browser.opera = engine.opera;

          //检测平台
          var p = navigator.platform;
          system.win = p.indexOf("Win") == 0;
          system.mac = p.indexOf("Mac") == 0;
          system.xll = (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 "6.1":
                              system.win = "7";
                              break;
                          default :
                              system.win = "NT";
                              break;
                      }
                  } else if (RegExp.$1 == "9x") {
                      system.win = "ME";
                  } else {
                      system.win = RegExp.$1;
                  }
              }
          }

          //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;
          //windos 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Android版本
          if (/Android (\d+\. \d+)/.test(ua)) {
              system.android = parseFloat(RegExp.$1);
          }
          //游戏系统
          system.will = ua.indexOf("Wii") > -1;
          system.ps = /playstation/i.test(ua);
          //返回这些对象
          return {
                engine:engine,
                browser:browser,
                system:system
            };
      }();

使用：

Paste_Image.png