js获取浏览器类型

function add(){

            var userAgent = navigator.userAgent,   

            rMsie = /(msie\s|trident.*rv:)([\w.]+)/,   

            rFirefox = /(firefox)\/([\w.]+)/,   

            rOpera = /(opera).+version\/([\w.]+)/,   

            rChrome = /(chrome)\/([\w.]+)/,   

            rSafari = /version\/([\w.]+).*(safari)/;  

            var browser;  

            var version;  

            var ua = userAgent.toLowerCase();  

            var stu_name;

            function uaMatch(ua) {  

                var match = rMsie.exec(ua);  

                if (match != null) {  

                    alert("IE");

                    stu_name = $("#stu_name").text().split("\n"); 

                    alert(stu_name);
　　　　　　　　　　　　

var Sys = {};
var ua = navigator.userAgent.toLowerCase();
var s;
(s = ua.match(/msie ([\d.]+)/)) ? Sys.ie = s[1] :
(s = ua.match(/firefox\/([\d.]+)/)) ? Sys.firefox = s[1] :
(s = ua.match(/chrome\/([\d.]+)/)) ? Sys.chrome = s[1] :
(s = ua.match(/opera.([\d.]+)/)) ? Sys.opera = s[1] :
(s = ua.match(/version\/([\d.]+).*safari/)) ? Sys.safari = s[1] : 0;
if(Sys.ie == '8.0'){
alert("ie8");
}

                }  

                var match = rFirefox.exec(ua);  

                if (match != null) {  

                    alert("rFirefox");

                    stu_name = $("#stu_name").val().split("\n"); 

                    alert(stu_name);

                }  

                var match = rOpera.exec(ua);  

                if (match != null) {  

                    alert("rOpera");

                    stu_name = $("#stu_name").val().split("\n"); 

                    alert(stu_name);

                }  

                var match = rChrome.exec(ua);  

                if (match != null) {  

                    alert("rChrome");

                    stu_name = $("#stu_name").val().split("\n"); 

                    alert(stu_name);

                }  

                var match = rSafari.exec(ua);

                if (match != null) {

                    alert("rSafari");

                    stu_name = $("#stu_name").val().split("\n"); 

                    alert(stu_name);

                }  

                if (match != null) {

                    alert("null");

                    stu_name = $("#stu_name").val().split("\n"); 

                    alert(stu_name);

                }  

            }  

            var browserMatch = uaMatch(userAgent.toLowerCase());  

}