判断当前浏览器类型

 //判断当前浏览类型        function BrowserType()        {            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("Windows NT 6.1; Trident/7.0;") > -1 && !isIE; //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 (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 if(fIEVersion == 11)                { return "IE11";}                else                { return "0"}//IE版本过低            }//isIE end            if (isFF) { return "FF";}            if (isOpera) { return "Opera";}            if (isSafari) { return "Safari";}            if (isChrome) { return "Chrome";}            if (isEdge) { return "Edge";}        }        var Browser = BrowserType();        console.log("浏览器："+ Browser);