function BrowserCheck()
{
    var N= navigator.appName, ua= navigator.userAgent, tem;
    var M= ua.match(/(opera|chrome|safari|firefox|msie|trident)\/?\s*(\.?\d+(\.\d+)*)/i);
    if(M && (tem= ua.match(/version\/([\.\d]+)/i))!= null) {M[2]=tem[1];}
    M= M? [M[1], M[2]]: [N, navigator.appVersion,'-?'];
    return M;
}

这将返回一个数组，第一个元素是浏览器名称，第二个元素是字符串格式的完整版本号。

<script type="text/javascript">
var version = navigator.appVersion;
alert(version);
</script>

我想分享我为我必须解决的问题而编写的代码。它在大多数主流浏览器中都进行了测试，对我来说，它就像一个魅力!

似乎这段代码与其他答案非常相似，但它进行了修改，以便我可以使用它而不是我最近错过的jquery浏览器对象，当然它是上述代码的组合，从我的部分我做了一些改进:

(function($, ua){

var M = ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || [],
    tem, 
    res;

if(/trident/i.test(M[1])){
    tem = /\brv[ :]+(\d+)/g.exec(ua) || [];
    res = 'IE ' + (tem[1] || '');
}
else if(M[1] === 'Chrome'){
    tem = ua.match(/\b(OPR|Edge)\/(\d+)/);
    if(tem != null) 
        res = tem.slice(1).join(' ').replace('OPR', 'Opera');
    else
        res = [M[1], M[2]];
}
else {
    M = M[2]? [M[1], M[2]] : [navigator.appName, navigator.appVersion, '-?'];
    if((tem = ua.match(/version\/(\d+)/i)) != null) M = M.splice(1, 1, tem[1]);
    res = M;
}

res = typeof res === 'string'? res.split(' ') : res;

$.browser = {
    name: res[0],
    version: res[1],
    msie: /msie|ie/i.test(res[0]),
    firefox: /firefox/i.test(res[0]),
    opera: /opera/i.test(res[0]),
    chrome: /chrome/i.test(res[0]),
    edge: /edge/i.test(res[0])
}

})(typeof jQuery != 'undefined'? jQuery : window.$, navigator.userAgent);

 console.log($.browser.name, $.browser.version, $.browser.msie); 
// if IE 11 output is: IE 11 true

这里有更好的兼容性@kennebec snippet; 将返回浏览器名称和版本(返回72而不是72.0.3626.96)。

在Safari, Chrome, Opera, Firefox, IE, Edge, UCBrowser上测试，也在移动设备上测试。

function browser() {
    var userAgent = navigator.userAgent,
        match = userAgent.match(/(opera|chrome|crios|safari|ucbrowser|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || [],
        result = {},
        tem;

    if (/trident/i.test(match[1])) {
        tem = /\brv[ :]+(\d+)/g.exec(userAgent) || [];
        result.name = "Internet Explorer";
    } else if (match[1] === "Chrome") {
        tem = userAgent.match(/\b(OPR|Edge)\/(\d+)/);

        if (tem && tem[1]) {
            result.name = tem[0].indexOf("Edge") === 0 ? "Edge" : "Opera";
        }
    }
    if (!result.name) {
        tem = userAgent.match(/version\/(\d+)/i); // iOS support
        result.name = match[0].replace(/\/.*/, "");

        if (result.name.indexOf("MSIE") === 0) {
            result.name = "Internet Explorer";
        }
        if (userAgent.match("CriOS")) {
            result.name = "Chrome";
        }

    }
    if (tem && tem.length) {
        match[match.length - 1] = tem[tem.length - 1];
    }

    result.version = Number(match[match.length - 1]);

    return result;
}

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

// In Opera, the true version is after "Opera" or after "Version"

if ((verOffset=nAgt.indexOf("Opera"))!=-1) {
 browserName = "Opera";
 fullVersion = nAgt.substring(verOffset+6);
 if ((verOffset=nAgt.indexOf("Version"))!=-1)
   fullVersion = nAgt.substring(verOffset+8);
}
// In MSIE, the true version is after "MSIE" in userAgent

else if ((verOffset=nAgt.indexOf("MSIE"))!=-1) {
 browserName = "Microsoft Internet Explorer";
 fullVersion = nAgt.substring(verOffset+5);
}
// In Chrome, the true version is after "Chrome"

else if ((verOffset=nAgt.indexOf("Chrome"))!=-1) {
 browserName = "Chrome";
 fullVersion = nAgt.substring(verOffset+7);
}
// In Safari, the true version is after "Safari" or after "Version"

else if ((verOffset=nAgt.indexOf("Safari"))!=-1) {
 browserName = "Safari";
 fullVersion = nAgt.substring(verOffset+7);
 if ((verOffset=nAgt.indexOf("Version"))!=-1)
   fullVersion = nAgt.substring(verOffset+8);
}
// In Firefox, the true version is after "Firefox"

else if ((verOffset=nAgt.indexOf("Firefox"))!=-1) {
 browserName = "Firefox";
 fullVersion = nAgt.substring(verOffset+8);
}
// In most other browsers, "name/version" is at the end of userAgent

else if ( (nameOffset=nAgt.lastIndexOf(' ')+1) <
          (verOffset=nAgt.lastIndexOf('/')) )
{
 browserName = nAgt.substring(nameOffset,verOffset);
 fullVersion = nAgt.substring(verOffset+1);
 if (browserName.toLowerCase()==browserName.toUpperCase()) {
  browserName = navigator.appName;
 }
}

// trim the fullVersion string at semicolon/space if present

if ((ix=fullVersion.indexOf(";"))!=-1)
   fullVersion=fullVersion.substring(0,ix);
if ((ix=fullVersion.indexOf(" "))!=-1)
   fullVersion=fullVersion.substring(0,ix);

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

document.write(''
 +'Browser name  = '+browserName+'<br>'
 +'Full version  = '+fullVersion+'<br>'
 +'Major version = '+majorVersion+'<br>'
 +'navigator.appName = '+navigator.appName+'<br>'
 +'navigator.userAgent = '+navigator.userAgent+'<br>'
)

看这里的演示..http://jsfiddle.net/hw4jM/3/

jQuery可以很好地处理这个问题(jQuery.browser)

var ua = $.browser;
if ( ua.mozilla && ua.version.slice(0,3) == "1.9" ) {
    alert( "Do stuff for firefox 3" );
}

编辑:正如Joshua在他的评论下面所写的，jQuery。jQuery自1.9版起不再支持browser属性(详情请参阅jQuery 1.9发布说明)。 jQuery开发团队建议使用更完整的方法，例如使用Modernizr库调整UI。