javascript - 浏览器检测兼容性问题

Question

您看到的是一个脚本，它将检索浏览器名称、版本和操作系统。我前段时间把这个脚本从网上拿了下来，但直到今天，一位测试同事指出它在 IE9 中不起作用(我一直在 Chrome41 和 IE11 上开发)。我知道 IE 的标记已更改为“rv”，并且我假设 IE 的两个实例都会返回一个值，因为我在 IF 语句中具有这两个条件。但是 IE9 中根本没有返回任何详细信息。有想法吗？

JS

//Browser name & version
{
    var unknown = '-';

    //browser
    var nVer = navigator.appVersion;
    var nAgt = navigator.userAgent;
    var browser = navigator.appName;
    var version = '' + parseFloat(navigator.appVersion);
    var majorVersion = parseInt(navigator.appVersion, 10);
    var nameOffset, verOffset, ix;

    // Opera
    if ((verOffset = nAgt.indexOf('Opera')) != -1) {
        browser = 'Opera';
        version = nAgt.substring(verOffset + 6);
        if ((verOffset = nAgt.indexOf('Version')) != -1) {
            version = nAgt.substring(verOffset + 8);
        }
    }
        // MSIE
    else if ((verOffset = nAgt.indexOf('MSIE')) != -1) {
        browser = 'Microsoft Internet Explorer';
        version = nAgt.substring(verOffset + 5);
    }
        // Chrome
    else if ((verOffset = nAgt.indexOf('Chrome')) != -1) {
        browser = 'Chrome';
        version = nAgt.substring(verOffset + 7);
    }
        // Safari
    else if ((verOffset = nAgt.indexOf('Safari')) != -1) {
        browser = 'Safari';
        version = nAgt.substring(verOffset + 7);
        if ((verOffset = nAgt.indexOf('Version')) != -1) {
            version = nAgt.substring(verOffset + 8);
        }
    }
        // Firefox
    else if ((verOffset = nAgt.indexOf('Firefox')) != -1) {
        browser = 'Firefox';
        version = nAgt.substring(verOffset + 8);
    }
        // MSIE 11+
    else if (nAgt.indexOf('Trident/') != -1) {
        browser = 'Microsoft Internet Explorer';
        version = nAgt.substring(nAgt.indexOf('rv:') + 3);
    }
        // Other browsers
    else if ((nameOffset = nAgt.lastIndexOf(' ') + 1) < (verOffset = nAgt.lastIndexOf('/'))) {
        browser = nAgt.substring(nameOffset, verOffset);
        version = nAgt.substring(verOffset + 1);
        if (browser.toLowerCase() == browser.toUpperCase()) {
            browser = navigator.appName;
        }
    }
    // trim the version string
    if ((ix = version.indexOf(';')) != -1) version = version.substring(0, ix);
    if ((ix = version.indexOf(' ')) != -1) version = version.substring(0, ix);
    if ((ix = version.indexOf(')')) != -1) version = version.substring(0, ix);

    majorVersion = parseInt('' + version, 10);
    if (isNaN(majorVersion)) {
        version = '' + parseFloat(navigator.appVersion);
        majorVersion = parseInt(navigator.appVersion, 10);
    }

    // Operating System Version
    var os = unknown;
    var clientStrings = [
                { s: 'Windows 3.11', r: /Win16/ },
                { s: 'Windows 95', r: /(Windows 95|Win95|Windows_95)/ },
                { s: 'Windows ME', r: /(Win 9x 4.90|Windows ME)/ },
                { s: 'Windows 98', r: /(Windows 98|Win98)/ },
                { s: 'Windows CE', r: /Windows CE/ },
                { s: 'Windows 2000', r: /(Windows NT 5.0|Windows 2000)/ },
                { s: 'Windows XP', r: /(Windows NT 5.1|Windows XP)/ },
                { s: 'Windows Server 2003', r: /Windows NT 5.2/ },
                { s: 'Windows Vista', r: /Windows NT 6.0/ },
                { s: 'Windows 7', r: /(Windows 7|Windows NT 6.1)/ },
                { s: 'Windows 8.1', r: /(Windows 8.1|Windows NT 6.3)/ },
                { s: 'Windows 8', r: /(Windows 8|Windows NT 6.2)/ },
                { s: 'Windows NT 4.0', r: /(Windows NT 4.0|WinNT4.0|WinNT|Windows NT)/ },
                { s: 'Windows ME', r: /Windows ME/ },
                { s: 'Android', r: /Android/ },
                { s: 'Open BSD', r: /OpenBSD/ },
                { s: 'Sun OS', r: /SunOS/ },
                { s: 'Linux', r: /(Linux|X11)/ },
                { s: 'iOS', r: /(iPhone|iPad|iPod)/ },
                { s: 'Mac OS X', r: /Mac OS X/ },
                { s: 'Mac OS', r: /(MacPPC|MacIntel|Mac_PowerPC|Macintosh)/ },
                { s: 'QNX', r: /QNX/ },
                { s: 'UNIX', r: /UNIX/ },
                { s: 'BeOS', r: /BeOS/ },
                { s: 'OS/2', r: /OS\/2/ },
                { s: 'Search Bot', r: /(nuhk|Googlebot|Yammybot|Openbot|Slurp|MSNBot|Ask Jeeves\/Teoma|ia_archiver)/ }
    ];
    for (var id in clientStrings) {
        var cs = clientStrings[id];
        if (cs.r.test(nAgt)) {
            os = cs.s;
            break;
        }
    }

    var osVersion = unknown;

    if (/Windows/.test(os)) {
        osVersion = /Windows (.*)/.exec(os)[1];
        os = 'Windows';
    }

    switch (os) {
        case 'Mac OS X':
            osVersion = /Mac OS X (10[\.\_\d]+)/.exec(nAgt)[1];
            break;

        case 'Android':
            osVersion = /Android ([\.\_\d]+)/.exec(nAgt)[1];
            break;

        case 'iOS':
            osVersion = /OS (\d+)_(\d+)_?(\d+)?/.exec(nVer);
            osVersion = osVersion[1] + '.' + osVersion[2] + '.' + (osVersion[3] | 0);
            break;
    }
}

window.jscd = {
    browser: browser,
    browserVersion: version,
    os: os,
    osVersion: osVersion
};

document.getElementById("browserName").innerHTML = jscd.browser;
document.getElementById("browserVersion").innerHTML = jscd.browserVersion;
document.getElementById("os").innerHTML = "<b>" + jscd.os + "  " + jscd.osVersion + "</b>";

Answer 1

抱歉，我无法发表评论，因为我没有声誉......

可能是兼容模式的问题吗？

无论如何，你可以看看这个http://www.useragentstring.com/pages/Internet%20Explorer/可能的用户代理字符串。

当您使用IE9时，您会在哪个ELSE IF语句中输入？