브라우저 확인

function getWebBrowserName() {
            var agt = navigator.userAgent.toLowerCase();
 
            if (agt.indexOf("edge") != -1) {
                return "Edge";
            } else if (agt.indexOf("chrome") != -1) {
                return "Chrome";
            } else if (agt.indexOf("opera") != -1) {
                return "Opera";
            } else if (agt.indexOf("firefox") != -1) {
                return "FireFox";
            } else if (agt.indexOf("msie") != -1 || agt.indexOf("trident") != -1) {
                return "Internet Explorer";
            } else if (agt.indexOf("netscape") != -1) {
                return "Netscape";
            } else {
                return "Unknown";
            }
        }
 
document.write("<h1>" + getWebBrowserName() + "</h1>");