服务器返回以逗号隔开的字符，动态…

 function themeFCYResult()  { 
       if  ((request.readyState == 4) && 
              (request.status == 200))  {  
              alert(request.responseText);
    var dis=request.responseText;
    var tra=document.getElementByIdx_x("comment_retweet1");
       var arr=dis.split(","); 
                for(var i=0;i
                    var newoption = document.createElement_x("OPTION");     
                    tra.options.add(newoption); 
                    newoption.innerText=arr[i]; 
                    newoption.value=i+1; 
                }
     }
     }
      //发送请求,绑定回调方法 
      function themeFCYRequest() {
          //创建XMLHTTPRequest对象
          alert("cy");
           var d= Math.random().toString();
          // var time =document.getElementByIdx_x('timeA').innerText;
          // var username = document.getElementByIdx_x('nameA').innerText;
          getRequestObject();
          //绑定回调方法
          request.onreadystatechange=themeFCYResult; 
          //发送请求
          request.open("POST", "servlet/QueryThemeServlet?d="+d, true) ;  
          request.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
          request.send(null);
        }
       
        function optionClick(){//获得当前选中的option的值
        var select = document.getElementByIdx_x("comment_retweet1");
        var index = select.selectedIndex;
        var text = select.options[index].text;
        document.getElementByIdx_x("tranIp").value=text;
        alert(document.getElementByIdx_x("tranIp").value);
    }