function getBrowser() {
        let e = navigator.userAgent.toLowerCase();
        return 	window.ActiveXObject
                || "ActiveXObject" in window
                    ? "ie"
                    : e.indexOf("firefox") >= 0
                        ? "firefox"
                        : e.indexOf("chrome") >= 0
                            ? "chrome"
                            : e.indexOf("opera") >= 0
                                ? "opera"
                                : e.indexOf("safari") >= 0
                                    ? "safari"
                                    : "ie"
    }