JS判断浏览器

  //判断是否是IE
    function isIEs() {
        if (!!window.ActiveXObject || "ActiveXObject" in window)
            return true;
        else
            return false;
    }
    function myBrowser() {
        var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串
        var isOpera = userAgent.indexOf("Opera") > -1; //判断是否Opera浏览器
        var isIE = userAgent.indexOf("compatible") > -1
            && userAgent.indexOf("MSIE") > -1 && !isOpera; //判断是否IE浏览器
        var isEdge = userAgent.indexOf("Edge") > -1; //判断是否IE的Edge浏览器
        var isFF = userAgent.indexOf("Firefox") > -1; //判断是否Firefox浏览器
        var isSafari = userAgent.indexOf("Safari") > -1
            && userAgent.indexOf("Chrome") == -1; //判断是否Safari浏览器
        var isChrome = userAgent.indexOf("Chrome") > -1
            && userAgent.indexOf("Safari") > -1; //判断Chrome浏览器
       
        if (isIEs()) {
            if (isIE) {
                var reIE = new RegExp("MSIE (\d+\.\d+);");
                reIE.test(userAgent);
                var fIEVersion = parseFloat(RegExp["$1"]);
                if (fIEVersion == 7) {
                    return "IE7";
                } else if (fIEVersion == 8) {
                    return "IE8";
                } else if (fIEVersion == 9) {
                    return "IE9";
                } else if (fIEVersion == 10) {
                    return "IE10";
                } else {
                    return "0";
                }//IE版本过低
                return "IE";
            } else {
                if (!window.ActiveXObject && "ActiveXObject" in window) {
                    return "IE11";
                }
            }

        }

        if (isOpera) {
            return "Opera";
        }
        if (isEdge) {
            return "Edge";
        }
        if (isFF) {
            return "FF";
        }
        if (isSafari) {
            return "Safari";
        }
        if (isChrome) {
            return "Chrome";
        }

    }