用户代理检测

完整的用户代理字符串检测脚本，包括检测呈现引擎、平台、windows操作系统、移动设备和游戏系统

var client = function(){



    //rendering engines

    var engine = {            

        ie: 0,

        gecko: 0,

        webkit: 0,

        khtml: 0,

        opera: 0,



        //complete version

        ver: null  

    };

    

    //browsers

    var browser = {

        

        //browsers

        ie: 0,

        firefox: 0,

        safari: 0,

        konq: 0,

        opera: 0,

        chrome: 0,

        safari: 0,



        //specific version

        ver: null

    };



    

    //platform/device/OS

    var system = {

        win: false,

        mac: false,

        x11: false,

        

        //mobile devices

        iphone: false,

        ipod: false,

        nokiaN: false,

        winMobile: false,

        macMobile: false,

        

        //game systems

        wii: false,

        ps: false 

    };    



    //detect rendering engines/browsers

    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);

        

        //figure out if it's Chrome or Safari

        if (/Chrome\/(\S+)/.test(ua)){

            browser.ver = RegExp["$1"];

            browser.chrome = parseFloat(browser.ver);

        } else if (/Version\/(\S+)/.test(ua)){

            browser.ver = RegExp["$1"];

            browser.safari = parseFloat(browser.ver);

        } else {

            //approximate version

            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);

        

        //determine if it's 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);

    }

    

    //detect browsers

    browser.ie = engine.ie;

    browser.opera = engine.opera;

    



    //detect platform

    var p = navigator.platform;

    system.win = p.indexOf("Win") == 0;

    system.mac = p.indexOf("Mac") == 0;

    system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);



    //detect windows operating systems

    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;

                    default:

                        system.win = "NT";

                        break;                

                }                            

            } else if (RegExp["$1"] == "9x"){

                system.win = "ME";

            } else {

                system.win = RegExp["$1"];

            }

        }

    }

    

    //mobile devices

    system.iphone = ua.indexOf("iPhone") > -1;

    system.ipod = ua.indexOf("iPod") > -1;

    system.nokiaN = ua.indexOf("NokiaN") > -1;

    system.winMobile = (system.win == "CE");

    system.macMobile = (system.iphone || system.ipod);

    

    //gaming systems

    system.wii = ua.indexOf("Wii") > -1;

    system.ps = /playstation/i.test(ua);

    

    //return it

    return {

        engine:     engine,

        browser:    browser,

        system:     system        

    };



}();