完整的用户代理字符串检测脚本

 //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
            }
            ;

        }();