JavaScript检测浏览器类型及版本

<script type="text/javascript">
        function getBroswer(){
            var os = navigator.platform;
            var userAgent = navigator.userAgent;
            var info = "";
            var tempArray = "";
            //判断浏览器版本
            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.toLowerCase().indexOf("edge") > -1 && !isIE; //判断是否IE的Edge浏览器
            var isIE11 = (userAgent.toLowerCase().indexOf("trident") > -1 && userAgent.indexOf("rv") > -1);

            if (/[Ff]irefox(\/\d+\.\d+)/.test(userAgent)) {
                tempArray = /([Ff]irefox)\/(\d+\.\d+)/.exec(userAgent);
                info += tempArray[1] + tempArray[2];
            } else if (isIE) {

                var version = "";
                var reIE = new RegExp("MSIE (\\d+\\.\\d+);");
                reIE.test(userAgent);
                var fIEVersion = parseFloat(RegExp["$1"]);
                if (fIEVersion == 7)
                { version = "IE7"; }
                else if (fIEVersion == 8)
                { version = "IE8"; }
                else if (fIEVersion == 9)
                { version = "IE9"; }
                else if (fIEVersion == 10)
                { version = "IE10"; }
                else
                { version = "0" }

                info += version;

            } else if (isEdge) {
                info += "Edge";
            } else if (isIE11) {
                info += "IE11";
            } else if (/[Cc]hrome\/\d+/.test(userAgent)) {
                tempArray = /([Cc]hrome)\/(\d+)/.exec(userAgent);
                info += tempArray[1] + tempArray[2];
            } else if (/[Vv]ersion\/\d+\.\d+\.\d+(\.\d)* *[Ss]afari/.test(userAgent)) {
                tempArray = /[Vv]ersion\/(\d+\.\d+\.\d+)(\.\d)* *([Ss]afari)/.exec(userAgent);
                info += tempArray[3] + tempArray[1];
            } else if (/[Oo]pera.+[Vv]ersion\/\d+\.\d+/.test(userAgent)) {
                tempArray = /([Oo]pera).+[Vv]ersion\/(\d+)\.\d+/.exec(userAgent);
                info += tempArray[1] + tempArray[2];
            } else {
                info += "unknown";
            }
           return info;
        }
        alert(getBroswer());
    </script>