js根据浏览器的useAgent来判断浏览器的类型

userAgent 属性是一个只读的字符串，声明了浏览器用于 HTTP 请求的用户代理头的值。

JavaScript语法：navigator.userAgent

PHP语法：$_SERVER['HTTP_USER_AGENT']

ASP语法：Request.ServerVariables("HTTP_USER_AGENT")

ASP.NET语法：HttpContext.Current.Request.UserAgent

JSP语法：request.getHeader("User-Agent")

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Chrome: (version: 50.0.2661.102 m)

js:   userAgent :Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko)Chrome/50.0.2661.102 Safari/537.36

js:   userAgent :  Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36

-------------------------------------------------------

Firefox: (version: 47.0)

jsp: userAgent : Mozilla/5.0 (Windows NT 6.1; WOW64; rv:47.0) Gecko/20100101Firefox/47.0

js:   userAgent : Mozilla/5.0 (Windows NT 6.1; WOW64; rv:47.0) Gecko/20100101Firefox/47.0

-------------------------------------------------------

Safari: (version: 5.1.7)

jsp: userAgent : Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534.57.2 (KHTML, like Gecko) Version/5.1.7Safari/534.57.2

js:   userAgent : Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/534.57.2 (KHTML, like Gecko)Version/5.1.7Safari/534.57.2

-------------------------------------------------------

IE 8:  (version: 8.0.7601.17514, update versions: 0)

jsp:  userAgent : Mozilla/4.0 (compatible;MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0)

js:   userAgent : Mozilla/4.0 (compatible;MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0)

-------------------------------------------------------

IE 11:  (version: 11.0.9600.18321 update Versions: 11.0.31)

jsp: userAgent : Mozilla/5.0 (Windows NT 6.3; WOW64;Trident/7.0; rv:11.0) like Gecko

js:   userAgent : Mozilla/5.0 (Windows NT 6.3; WOW64;Trident/7.0; .NET4.0E; .NET4.0C; .NET CLR 3.5.30729; .NET CLR 2.0.50727; .NET CLR 3.0.30729; InfoPath.3; rv:11.0) like Gecko

-------------------------------------------------------

Windows Edge:  (version: 25.10580.0.0)

jsp: userAgent : Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2486.0 Safari/537.36 Edge/13.10586

js:   userAgent : Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2486.0 Safari/537.36 Edge/13.10586

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[乐意黎 ]

接下来，如何判断浏览器的类型呢 ？

IE 浏览器 ：

JS 代码:

//返回浏览器的类型: "ie", "firefox", "chrome", "opera", "safari", "unknow"

// author: aerchi

// site:www.aerchi.com

// blog: http://blog.csdn.net/aerchi/article/details/51697592

// email: aerchi@gmail.com

// date: 2016-06-17

// update: 2016-08-11 00:56:00

// call like: getBrowser(1)

// return like "chrome/50.0.2661.102"

// call like: getBrowser()

// return like "chrome"

function getBrowser(getVersion)

{

    //注意关键字大小写

    var ua_str = navigator.userAgent.toLowerCase(), ie_Tridents, trident, match_str, ie_aer_rv, browser_chi_Type;

//判断IE 浏览器,

    //blog: http://blog.csdn.Net/aerchi/article/details/51697592

    if("ActiveXObject" in self){

        // ie_aer_rv:  指示IE 的版本.

        // It can be affected by the current document mode of IE.

        ie_aer_rv= (match_str = ua_str.match(/msie ([\d.]+)/)) ?match_str[1] :

              (match_str = ua_str.match(/rv:([\d.]+)/)) ?match_str[1] : 0;

        // ie: Indicate the really version of current IE browser.

        ie_Tridents = {"trident/7.0": 11, "trident/6.0": 10, "trident/5.0": 9, "trident/4.0": 8};

        //匹配 ie8, ie11, edge

        trident = (match_str = ua_str.match(/(trident\/[\d.]+|edge\/[\d.]+)/)) ?match_str[1] : undefined;

        browser_chi_Type = (ie_Tridents[trident] || ie_aer_rv) > 0 ? "ie" : undefined;

    }else{

        //判断 windows edge 浏览器

        // match_str[1]: 返回浏览器及版本号,如: "edge/13.10586"

        // match_str[1]: 返回版本号,如: "edge" 

        //若要返回 "edge" 请把下行的 "ie" 换成 "edge"。 注意引号及冒号是英文状态下输入的

        browser_chi_Type = (match_str = ua_str.match(/edge\/([\d.]+)/)) ? "edge" :

                    //判断firefox 浏览器

                      (match_str = ua_str.match(/firefox\/([\d.]+)/)) ? "firefox" :

                    //判断chrome 浏览器

                      (match_str = ua_str.match(/chrome\/([\d.]+)/)) ? "chrome" :

                    //判断opera 浏览器

                      (match_str = ua_str.match(/opera.([\d.]+)/)) ? "opera" :

                    //判断safari 浏览器

                      (match_str = ua_str.match(/version\/([\d.]+).*safari/)) ? "safari" : undefined;

    }

    console.log("author: aerchi, blog: http://blog.csdn.net/aerchi");    

    //返回浏览器类型和版本号

    var verNum, verStr;

    verNum = trident && ie_Tridents[trident] ? ie_Tridents[trident] : match_str[1];

    verStr = (getVersion != undefined) ? browser_chi_Type+"/"+verNum : browser_chi_Type;

    return verStr;

 }

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