function getData()
   {
           if (window.ActiveXObject) {
             xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
         } else if (window.XMLHttpRequest) {
             xmlhttp = new XMLHttpRequest();
         }
       xmlhttp.Open("GET","Data.aspx",true);
       xmlhttp.onreadystatechange=stateChange;
       xmlhttp.Send(null);
      }
   function stateChange()
   {
      if(xmlhttp.readystate==4)
      {
         if(xmlhttp.status==200)
         {
             var data=(xmlhttp.responseText);
           
            document.getElementById("list").innerHTML=data;
 
         }

      }

   }
这代码为什么在火狐中就不能执行呢
什么也看不到,也没有错误提示
望知道者指点.