浏览器useragent

var ua = window.navigator.userAgent;

edge ：Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36 Edge/17.17134

Chrome：Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.119 Safari/537.36

Opera（高版本）：Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36 OPR/58.0.3135.118

fixfox：Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:65.0) Gecko/20100101 Firefox/65.0

ie11：Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; .NET4.0C; .NET4.0E; .NET CLR 2.0.50727; .NET CLR 3.0.30729; .NET CLR 3.5.30729; rv:11.0) like Gecko （兼容模式得出的）

ie10：Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 10.0; WOW64; Trident/7.0; .NET4.0C; .NET4.0E; .NET CLR 2.0.50727; .NET CLR 3.0.30729; .NET CLR 3.5.30729)  （兼容模式得出的）

ie8：Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; WOW64; Trident/4.0)

ie ua 参考：https://docs.microsoft.com/en-us/previous-versions/windows/internet-explorer/ie-developer/compatibility/ms537503(v=vs.85)

Android 微信浏览器：Mozilla/5.0 (Linux; Android 8.0.0; STF-AL00 Build/HUAWEISTF-AL00; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/66.0.3359.126 MQQBrowser/6.2 TBS/044504 Mobile Safari/537.36 MMWEBID/6992 MicroMessenger/7.0.3.1400(0x2700033A) Process/tools NetType/WIFI Language/zh_CN

Android QQ浏览器：Mozilla/5.0 (Linux; Android 8.0; STF-AL00 Build/HUAWEISTF-AL00; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/57.0.2987.132 MQQBrowser/6.2 TBS/044468 Mobile Safari/537.36 V1_AND_SQ_7.7.0_882_YYB_D QQ/7.7.0.3640 NetType/WIFI WebP/0.3.0 Pixel/1080

Android 华为浏览器：Mozilla/5.0 (Linux; U; Android 8.0.0zh-cn; STF-AL00 Build/HUAWEISTF-AL00) AppleWebKit/537.36 (KHTML, like Gecko)Version/4.0 Chrome/57.0.2987.132 MQQBrowser/8.1 Mobile Safari/537.36

iOS 微信浏览器：Mozilla/5.0 (iPhone; CPU iPhone OS 12_1_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/16C101 MicroMessenger/7.0.0(0x17000024) NetType/WIFI Language/zh_CN

iOS Safari：Mozilla/5.0 (iPhone; CPU iPhone OS 12_1_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0 Mobile/15E148 Safari/604.1

在Chrome（28及往后版本）、Opera（15及往后版本）和Yandex浏览器中使用blink内核，但在user-agent上却没有体现（仍然写的appleWebkit）。这也是为了兼容性，web开发者都习惯了将webkit作为兼容性最好的内核， 为了更好地浏览器体验，就沿用了webkit字段

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
        edge:0,
        ie: 0,
        firefox: 0,
        safari: 0,
        konq: 0,
        opera: 0,
        chrome: 0,

        //具体的版本号
        ver: null
    };

    //平台、设备和操作系统
    var system = {

        win: false,
        mac: false,
        x11: false,    //unix(包含各种Linux）

        //移动设备
        iphone: false,
        ipod: false,
        ipad: false,
        ios: false,
        android: false,
        nokiaN: false,
        winMobile: false,

        //游戏系统
        wii: 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Edge,Opera, Chrome 还是 Safari
        if (/Edge\/(\S+)/.test(ua)){

            browser.ver = RegExp["$1"];
            browser.edge = parseFloat(browser.ver);
        }else if (/OPR\/(\S+)/.test(ua)){   //opera浏览器后来使用blink引擎

            browser.ver = RegExp["$1"];
            browser.opera = parseFloat(browser.ver);
        }else 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 {

            //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);

    }else if(/Trident/.test(ua)){

        engine.ver = browser.ver = "11.0";
        engine.ie = browser.ie = 11;

    }

    //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.x11 = (p == "X11") || (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;

                    case "6.2":
                        system.win = "8";
                        break;

                    case "6.3":
                        system.win = "8.1";
                        break;

                    case "10.0":
                        system.win = "10.0";
                        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;

    //windows 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.wii = ua.indexOf("Wii") > -1;
    system.ps = /playstation/i.test(ua);

    //返回这些对象
    return {
        engine:     engine,
        browser:    browser,
        system:     system
    };
}();

console.log(navigator.userAgent);
console.log(client);