DOJO的xhrGET发出请求，返回时整个页面

Question

<c:forEach var="item" items="${TjobMeteoForecastData}"> 
   <%
       String callback = request.getParameter("callback");
       String result= "";
       if(callback != null){
            if(callback.equalsIgnoreCase("acc_level") ){
     //         && callback.equalsIgnoreCase("${item.wrfactorName}")){
                response.setContentType("text/html; charset=UTF-8");
                result = "${item.wrinterpPolygon}";
       }
       response.getWriter().write(result);
       return ;
       }
    %>
    ${item.wrfactorName}  ${item.wrstartTime} 
</c:forEach>