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

         }

     }