https://www.metcaseusa.com/assets/js/browser.js

1function get_browser(){
2	var ua=navigator.userAgent,tem,M=ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || [];
3	if(/trident/i.test(M[1])){
4		tem=/\brv[ :]+(\d+)/g.exec(ua) || [];
5		return {name:'IE',version:(tem[1]||'')};
6	}
7	if(M[1]==='Chrome'){
8		tem=ua.match(/\bOPR\/(\d+)/)
9		if(tem!=null)   {return {name:'Opera', version:tem[1]};}
10	}
11	M=M[2]? [M[1], M[2]]: [navigator.appName, navigator.appVersion, '-?'];
12	if((tem=ua.match(/version\/(\d+)/i))!=null) {M.splice(1,1,tem[1]);}
13	return {
14		name: M[0],
15		version: M[1]
16	};
17}