JavaScript判断浏览器类型及版本（新增IE11）

$(function () {

var Sys = {};

var ua = navigator.userAgent.toLowerCase();

var s;

(s = ua.match(/rv:([\d.]+)\) like gecko/)) ? Sys.ie = s[1] :

(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) $('span').text('IE: ' + Sys.ie);

if (Sys.firefox) $('span').text('Firefox: ' + Sys.firefox);

if (Sys.chrome) $('span').text('Chrome: ' + Sys.chrome);

if (Sys.opera) $('span').text('Opera: ' + Sys.opera);

if (Sys.safari) $('span').text('Safari: ' + Sys.safari);

});