JS判断浏览器类型

/** 
     * @param {*} 判断浏览器类型
     * @param {*} oneIE 字符串 是否为ie浏览器
    */
    myBrowser(oneIE){
        var userAgent = navigator.userAgent, //取得浏览器的userAgent字符串
        isOpera = userAgent.indexOf("Opera") > -1, //判断是否Opera浏览器
        isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1 && !isOpera, //判断是否IE11以下浏览器
        isIE11 = !!window.ActiveXObject || "ActiveXObject" in window, //判断是否IE11浏览器
        isFF = userAgent.indexOf("Firefox") > -1, //判断是否Firefox浏览器
        isSafari = userAgent.indexOf("Safari") > -1, //判断是否Safari浏览器
        isChrome = userAgent.indexOf("Chrome") > -1; //判断是否Chrome浏览器
        if(oneIE && isIE11) {
            return "IE";
        } else {
            if(isIE && !isIE11) {
                var IE5 = IE55 = IE6 = IE7 = IE8 = IE9 = IE10 = false,
                    reIE = new RegExp("MSIE (\\d+\\.\\d+);");
                reIE.test(userAgent);
                var fIEVersion = parseFloat(RegExp["$1"]),
                    IE55 = fIEVersion == 5.5,
                    IE6 = fIEVersion == 6.0,
                    IE7 = fIEVersion == 7.0,
                    IE8 = fIEVersion == 8.0,
                    IE9 = fIEVersion == 9.0,
                    IE10 = fIEVersion == 10.0;
                if(IE55) {
                    return "IE55";
                }
                if(IE6) {
                    return "IE6";
                }
                if(IE7) {
                    return "IE7";
                }
                if(IE8) {
                    return "IE8";
                }
                if(IE9) {
                    return "IE9";
                }
                if(IE10) {
                    return "IE10";
                }
            }
            if(isIE11) {
                return "IE11";
            }
        }
        //isIE end
        if(isFF) {
            return "FF";
        }
        if(isOpera) {
            return "Opera";
        }
        if(isSafari){
            return "Safari";
        }
        if(isChrome) {
            return "Chrome";
        }
    },