open-flash-chart怎么不断更新数据

Question

我用ajax获得数据，然后每隔两秒去请求一次
这样写为啥不对？？
    
        <script type="text/javascript">
        function ofc_ready()
        {
            alert('ofc_ready');
            setInterval(load_1,2000);
        }
        function open_flash_chart_data()
        {
            alert( 'reading data' );
            
            $.ajax({
                   type: "POST",
                   url: "<%=request.getContextPath()%>/ShowChart",
                   success: function(msg){
                     alert( "1111Data Saved: " + msg );
                     return JSON.stringify(msg);
                   },
                   async: false
                }); 
            alert("end of reading");
            
        }
         
        function findSWF(movieName) {
          if (navigator.appName.indexOf("Microsoft")!= -1) {
            return window[movieName];
          } else {
            return document[movieName];
          }
        }
        
        function load_1()
        {
          tmp = findSWF("my_chart");
          $.ajax({
               type: "POST",
               url: "<%=request.getContextPath()%>/ShowChart",
               success: function(msg){
                 alert( "2222Data Saved: " + msg );
                 x = tmp.load( JSON.stringify(msg) );
               },
               async: false
                   
            }); 
        }
        
    </script>