如何用JavaScript判断是否为IE浏览器？

isIE() {
            var ua = window.navigator.userAgent;

            var msie = ua.indexOf("MSIE ");
            if (msie > 0) {
                // IE 10 or older => return version number
                return true;
            }

            var trident = ua.indexOf("Trident/");
            if (trident > 0) {
                // IE 11 => return version number
                return true;
            }

            var edge = ua.indexOf("Edge/");
            if (edge > 0) {
                // Edge (IE 12+) => return version number
                return true;
            }

            // other browser
            return false;
        },