js如何判断IE浏览器的版本包括IE11

IE浏览器真是个坑：从ie6以及以前IE版本，简直就是垃圾，不按照Mozilla国际组织的标准来，乱搞。搞得兼容性很差：

 

<script type="text/javascript">

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();

function uaMatch(ua){

 var match = rMsie.exec(ua);

 if(match != null){

 return { browser : "IE", version : match[2] || "0" };

 }

 var match = rFirefox.exec(ua);

 if (match != null) {

 return { browser : match[1] || "", version : match[2] || "0" };

 }

 var match = rOpera.exec(ua);

 if (match != null) {

 return { browser : match[1] || "", version : match[2] || "0" };

 }

 var match = rChrome.exec(ua);

 if (match != null) {

 return { browser : match[1] || "", version : match[2] || "0" };

 }

 var match = rSafari.exec(ua);

 if (match != null) {

 return { browser : match[2] || "", version : match[1] || "0" };

 }

 if (match != null) {

 return { browser : "", version : "0" };

 }

}

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

if (browserMatch.browser){

 browser = browserMatch.browser;

 version = browserMatch.version;

}

document.write(browser+version); 

</script>

 

我这里有个最简单的：