纯JS判断各种浏览器类型及版本.

if (!document.all) {
alert('IE11+ or not IE');
}

if (document.all && document.addEventListener && window.atob) {
alert('IE10');
}

if (document.all && document.addEventListener && !window.atob) {
alert('IE9');
}

if (document.all && document.querySelector && !document.addEventListener) {
alert('IE8');
}

if (document.all && window.XMLHttpRequest && !document.querySelector) {
alert('IE7');
}

if (document.all && document.compatMode && !window.XMLHttpRequest) {
alert('IE6');
}

var  browser = {};
var  userAgent = navigator.userAgent.toLowerCase();
var  s;
(s = userAgent.match(/msie ([\d.]+)/)) ? browser.ie = s[1] :
(s = userAgent.match(/firefox\/([\d.]+)/)) ? browser.firefox = s[1] :
(s = userAgent.match(/chrome\/([\d.]+)/)) ? browser.chrome = s[1] :
(s = userAgent.match(/opera.([\d.]+)/)) ? browser.opera = s[1] :
(s = userAgent.match(/version\/([\d.]+).*safari/)) ? browser.safari = s[1] : 0;
var  version;
if  (browser.ie) {
version ='ie'+ browser.ie;
} else if  (browser.firefox) {
version = 'firefox '  + browser.firefox;
} else if  (browser.chrome) {
version = 'chrome '  + browser.chrome;
} else if  (browser.opera) {
version = 'opera '  + browser.opera;
} else if  (browser.safari) {
version = 'safari '  + browser.safari;
} else {
version = '未知浏览器' ;
}
return  version;