function IEVersion() {

            var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串

            var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1; //判断是否IE<11浏览器

            var isEdge = userAgent.indexOf("Edge") > -1 && !isIE; //判断是否IE的Edge浏览器

            var isIE11 = userAgent.indexOf('Trident') > -1 && userAgent.indexOf("rv:11.0") > -1;

            if (isIE) {

                var reIE = new RegExp("MSIE (\\d+\\.\\d+);");

                reIE.test(userAgent);

                var fIEVersion = parseFloat(RegExp["$1"]);

                if (fIEVersion == 7) {

                    return 7;

                } else if (fIEVersion == 8) {

                    return 8;

                } else if (fIEVersion == 9) {

                    return 9;

                } else if (fIEVersion == 10) {

                    return 10;

                } else {

                    return 6;//IE版本<=7

                }

            } else if (isEdge) {

                return 'edge';//edge

            } else if (isIE11) {

                return 11; //IE11

            } else {

                return -1;//不是ie浏览器

            }

        };