js 控制cookie

<script type="text/javascript">
      
 
      function  SetMessage1()
      {
        if(navigator.cookieEnabled)
        {
            var where=document.referrer;
            if(where)
            {
                str="refer="+where;
            }
            str=str+":navigator="+navigator.appName;
            time=new Date();
            var timeString=time.getFullYear();
            timeString+="/"+(time.getMonth()+1)+"/"+time.getDay();
            str+=":"+timeString;
//            alert(str);        
            
        }
        
     }  
     //-----------------------------以下スタット---------------------------------
      function  setCookie(visite,date)
      {
           
           var srCookie="name=test1:visite="+visite+";expires="+date.toGMTString();
           document.cookie=srCookie;   
      }
    
     function getCookie()
     {      
        if(document.cookie)
         {
               
                var arCookie=document.cookie.split(':');
                for(var i=0;i<arCookie.length;i++)
                {
                    if(arCookie[i].indexOf("visite")!=-1)
                    {
                      
                        return arCookie[i].split('=')[1];
                    }
                }
          }
          return null;         
        
     }   
     
      var date = new Date();
        var ms =180*1000;
       date.setTime(date.getTime() + ms);             
        var  visite=getCookie();     
     
     if(visite==null)
     {
        visite=1;
        setCookie(visite,date); 
        document.write("this is the "+visite+" times come here!"); 
     }
     else
     {
        visite=parseInt(visite)+1;
        setCookie(visite,date);   
        document.write("this is the "+visite+"times come here!"); 
     }
     
     function test()
     {
         var srCookie="name=test1:visite="+visite+";expires="+date.setTime(date.getTime() - ms);
           document.cookie=srCookie; 
     }
     </script>