js判断浏览器类型

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<script type="text/javascript">
function browserinfo(){
        var Browser_Name=navigator.appName;
        var Browser_Version=parseFloat(navigator.appVersion);
        var Browser_Agent=navigator.userAgent;
        var Actual_Version,Actual_Name;
        var is_IE=(Browser_Name=="Microsoft Internet Explorer");//判读是否为ie浏览器
        var is_NN=(Browser_Name=="Netscape");//判断是否为netscape浏览器
var is_op=(Browser_Name=="Opera");//判断是否为Opera浏览器
                if(is_NN){
            //upper 5.0 need to be process,lower 5.0 return directly
            if(Browser_Version>=5.0){
   if(Browser_Agent.indexOf("Netscape")!=-1){
        var Split_Sign=Browser_Agent.lastIndexOf("/");
                 var Version=Browser_Agent.lastIndexOf(" ");
     var Bname=Browser_Agent.substring(0,Split_Sign);
     var Split_sign2=Bname.lastIndexOf(" ");
                 Actual_Version=Browser_Agent.substring(Split_Sign+1,Browser_Agent.length);
                 Actual_Name=Bname.substring(Split_sign2+1,Bname.length);

   }
   if(Browser_Agent.indexOf("Firefox")!=-1){
        var Split_Sign=Browser_Agent.lastIndexOf("/");
                 var Version=Browser_Agent.lastIndexOf(" ");
                 Actual_Version=Browser_Agent.substring(Split_Sign+1,Browser_Agent.length);
                 Actual_Name=Browser_Agent.substring(Version+1,Split_Sign);

   }
   if(Browser_Agent.indexOf("Safari")!=-1){
   if(Browser_Agent.indexOf("Chrome")!=-1){
   var Split_Sign=Browser_Agent.lastIndexOf(" ");
                var Version=Browser_Agent.substring(0,Split_Sign);;
             var Split_Sign2=Version.lastIndexOf("/");
                var Bname=Version.lastIndexOf(" ");
                 Actual_Version=Version.substring(Split_Sign2+1,Version.length);
                 Actual_Name=Version.substring(Bname+1,Split_Sign2);
   }
   else{
       var Split_Sign=Browser_Agent.lastIndexOf("/");
                var Version=Browser_Agent.substring(0,Split_Sign);;
             var Split_Sign2=Version.lastIndexOf("/");
                var Bname=Browser_Agent.lastIndexOf(" ");
                 Actual_Version=Browser_Agent.substring(Split_Sign2+1,Bname);
                 Actual_Name=Browser_Agent.substring(Bname+1,Split_Sign);

   }
   }



             }
            else{
                 Actual_Version=Browser_Version;
                 Actual_Name=Browser_Name;
             }
         }
        else if(is_IE){
            var Version_Start=Browser_Agent.indexOf("MSIE");
            var Version_End=Browser_Agent.indexOf(";",Version_Start);
             Actual_Version=Browser_Agent.substring(Version_Start+5,Version_End)
             Actual_Name=Browser_Name;

            if(Browser_Agent.indexOf("Maxthon")!=-1||Browser_Agent.indexOf("MAXTHON")!=-1){
   var mv=Browser_Agent.lastIndexOf(" ");
   var mv1=Browser_Agent.substring(mv,Browser_Agent.length-1);
            mv1="遨游版本:"+mv1;
        Actual_Name+="(Maxthon)";
     Actual_Version+=mv1;
             }

         }
   else if(Browser_Agent.indexOf("Opera")!=-1){
                 Actual_Name="Opera";
                var tempstart=Browser_Agent.indexOf("Opera");
                var tempend=Browser_Agent.length;
                 Actual_Version=Browser_Version;
             }
        else{
             Actual_Name="Unknown Navigator"
             Actual_Version="Unknown Version"
         }
        /*------------------------------------------------------------------------------
         --Your Can Create new properties of navigator(Acutal_Name and Actual_Version) --
         --Userage:                                                                     --
         --1,Call This Function.                                                        --
         --2,use the property Like This:navigator.Actual_Name/navigator.Actual_Version;--
         ------------------------------------------------------------------------------*/
         navigator.Actual_Name=Actual_Name;
         navigator.Actual_Version=Actual_Version;

        /*---------------------------------------------------------------------------
         --Or Made this a Class.                                                     --
         --Userage:                                                                  --
         --1,Create a instance of this object like this:var browser=new browserinfo;--
         --2,user this instance:browser.Version/browser.Name;                        --
         ---------------------------------------------------------------------------*/
        this.Name=Actual_Name;
        this.Version=Actual_Version;
     }
   browserinfo();

    document.write("你使用的浏览器是:"+navigator.userAgent);
document.write("<br>");
     document.write("你使用的浏览器是:"+navigator.Actual_Name+",版本号:"+navigator.Actual_Version);

</script>
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