JL获取浏览器类型

function getIEBrowers(){
		
		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 || userAgent.indexOf("rv:11") > -1; //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)   
	      {  
	          if(userAgent.indexOf("rv:11") > -1){
	              return "IE11";
	          }
	          if(userAgent.indexOf("rv:12") > -1){ //这一段还没验证
	              return "IE12";
	          }
	           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 if(fIEVersion == 12){ 
	        	   return "IE12";
	        	}
	           else{ 
	        	   return "0"
	        	}//IE版本过低  
	       }//isIE end  
	       if (isFF) {
	    	   return "Firefox";
	        }  
	       if (isOpera) {
	    	   return "Opera";
	    	}  
	       if (isSafari) {
	    	   return "Safari";
	       }  
	       if (isChrome) {
	    	   return "Chrome";
	       }  
	       if (isEdge) {
	    	   return "Edge";
	       }  
		
	}