<script>
  
		if(navigator.userAgent.indexOf("MSIE")>0) {
			alert("ie11以下");
	   } else{
		   if (!!window.ActiveXObject || "ActiveXObject" in window){
			  alert('ie11');
		   }else{
			   if(navigator.userAgent.indexOf("Firefox")>0){
				   alert("Firefox");
			   }else if(navigator.userAgent.indexOf("Chrome")>0){
					alert("Chrome");
			   }else{
					alert("else");
			   }
		   } 
	   }
  
  
  </script>