<!DOCTYPE HTML>

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

 <title>navigator</title>

 <script type="text/javascript">

   function validB(){ 

     var u_agent = navigator.userAgent      ; 

     var B_name="不是想用的主流浏览器!"; 

     if(u_agent.indexOf("Firefox")>-1){ 

         B_name="Firefox"; 

     }else if(u_agent.indexOf("Chrome")>-1){ 

         B_name="Chrome"; 

     }else if(u_agent.indexOf("MSIE")>-1&&u_agent.indexOf("Trident")>-1){ 

         B_name="IE(8-10)";  

     }

         document.write("浏览器:"+B_name+"<br>");

         document.write("u_agent:"+u_agent+"<br>"); 
  } 


  document.write("Browser Name"+navigator.appName+"<br>");
         document.write("浏览器的版本和平台"+navigator.appVersion+"<br>");
         document.write("浏览器的代码名的字符串"+navigator.appCodeName+"<br>");
         document.write("浏览器的平台"+navigator.platform+"<br>");
         document.write("浏览器的头部信息"+navigator.userAgent+"<br>"); </script>

 </head>

 <body>

   <form>

      <input type="button" value="查看浏览器" οnclick="validB();"  >

   </form>

 </body>

 </html>