javascript

navigator.sayswho= (function(){
	    var ua= navigator.userAgent, tem, 
	    M= ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || [];
	    if(/trident/i.test(M[1])){
	        tem=  /\brv[ :]+(\d+)/g.exec(ua) || [];
	        return 'IE '+(tem[1] || '');
	    }
	    if(M[1]=== 'Chrome'){
	        tem= ua.match(/\b(OPR|Edge)\/(\d+)/);
	        if(tem!= null) return tem.slice(1).join(' ').replace('OPR', 'Opera');
	    }
	    M= M[2]? [M[1], M[2]]: [navigator.appName, navigator.appVersion, '-?'];
	    if((tem= ua.match(/version\/(\d+)/i))!= null) M.splice(1, 1, tem[1]);
	    return M.join(' ');
	})();

	console.log(navigator.sayswho);