https://lenmedcenter.ru/js/utils.js

1(function(window,  undefined) {
2    var util = window.util = window.util || {};
3    util.brwHelper = {
4        isIE : function ( version ) {
5            var userAgent  = navigator.userAgent.toLowerCase(),
6                ie_version = -1,
7                result 	   = false;
8
9            if ( !version ){
10                result = ( navigator.appName == 'Microsoft Internet Explorer' )?true:false;
11            } else {
12                if (navigator.appName == 'Microsoft Internet Explorer') {
13                    var re = new RegExp("msie ([0-9]{1,}[\.0-9]{0,})");
14                    if (re.exec(userAgent) != null)
15                        ie_version = parseFloat(RegExp.$1);
16                    var version_ie = (ie_version>-1)?ie_version:parseInt((userAgent.match( /.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/ ) || [0,'0'])[1]);
17                    if ( Object.prototype.toString.apply( version ) === '[object Array]' ) {
18                        result = false;
19                        for (i = 0; i < version.length; i++) {
20                            if ( version_ie ==  version[i] )  result = true;
21                        }
22                    } else {
23                        result = ( version_ie == version )?true:false;
24                    }
25                } else {
26                    result = false;
27                }
28
29            }
30            return result;
31        }
32    }
33})(window);