javascript高级程序设计 --- 浏览器检测、操作系统检测、浏览器内核检测

JavaScript 包含一个名为 Navigator 的对象，它就可以完成上述的任务。

Navigator 包含了有关访问者浏览器的信息，包括浏览器类型、版本等等

Navigator 对象

JavaScript Navigator 对象包含了有关访问者浏览器的所有信息。

接下来我们学习 Navigator 对象的两个属性userAgent、platform。

下面给出一个实例加以说明，client模块。通用模块。

var client = function() {

    //渲染模式
    var engine = {
        ie: 0,
        gecko: 0,
        webkit: 0,
        khtml: 0,
        opera: 0,

        //complete version
        ver: null
    };

    //浏览器类型
    var browser = {

        //browsers
        ie: 0,
        firefox: 0,
        safari: 0,
        konq: 0,
        opera: 0,
        chrome: 0,

        //specific version
        ver: null
    };


    //操作系统类型
    var system = {
        win: false,
        mac: false,
        x11: false,

        //mobile devices
        iphone: false,
        ipod: false,
        ipad: false,
        ios: false,
        android: false,
        nokiaN: false,
        winMobile: false,

        //游戏机
        wii: false,
        ps: false
    };

    //侦测浏览器渲染模式及类型
    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);

        //是否是Chrome
        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);

        //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;


    //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);

    //侦测操作系统
    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;

    //winphohe
    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"]);
        }
    }


    //苹果系列
    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; //can't really detect - so guess
        }
    }

    //andriod设备
    if (/Android (d+.d+)/.test(ua)) {
        system.android = parseFloat(RegExp.$1);
    }

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

    //返回对象
    return {
        engine: engine,
        browser: browser,
        system: system
    };

}();

如何调用：

<!DOCTYPE html>
<html>
<head>
    <title>User-agent Detection Example</title>
    <script type="text/javascript" src="client.js"></script>
    </head>
<body>  
    <h2>Rendering Engines</h2>
    <ul>
        <li>client.engine.ie = <script>document.write(client.engine.ie);</script></li>
        <li>client.engine.webkit = <script>document.write(client.engine.webkit);</script></li>
        <li>client.engine.gecko = <script>document.write(client.engine.gecko);</script></li>
        <li>client.engine.khtml = <script>document.write(client.engine.khtml);</script></li>
        <li>client.engine.opera = <script>document.write(client.engine.opera);</script></li>
        <li>client.engine.ver = <script>document.write(client.engine.ver);</script></li>

    </ul>
    <h2>Browsers</h2>
    <ul>
        <li>client.browser.ie = <script>document.write(client.browser.ie);</script></li>
        <li>client.browser.safari = <script>document.write(client.browser.safari);</script></li>
        <li>client.browser.firefox = <script>document.write(client.browser.firefox);</script></li>
        <li>client.browser.konq = <script>document.write(client.browser.konq);</script></li>
        <li>client.browser.opera = <script>document.write(client.browser.opera);</script></li>
        <li>client.browser.chrome = <script>document.write(client.browser.chrome);</script></li>
        <li>client.browser.ver = <script>document.write(client.browser.ver);</script></li>
    </ul>
    
    <h2>System</h2>
    <ul>
        <li>client.system.win = <script>document.write(client.system.win);</script></li>
        <li>client.system.mac = <script>document.write(client.system.mac);</script></li>
        <li>client.system.x11 = <script>document.write(client.system.x11);</script></li>
        <li>client.system.iphone = <script>document.write(client.system.iphone);</script></li>
        <li>client.system.ipod = <script>document.write(client.system.ipod);</script></li>
        <li>client.system.ipad = <script>document.write(client.system.ipad);</script></li>
        <li>client.system.ios = <script>document.write(client.system.ios);</script></li>
        <li>client.system.android = <script>document.write(client.system.android);</script></li>
        <li>client.system.nokiaN = <script>document.write(client.system.nokiaN);</script></li>
        <li>client.system.winMobile = <script>document.write(client.system.winMobile);</script></li>
        <li>client.system.wii = <script>document.write(client.system.wii);</script></li>
        <li>client.system.ps = <script>document.write(client.system.ps);</script></li>    
    </ul>    
</body>
</html>

客户端显示如下：