fusioncharts，反复创建，内存不断增加

 $(function(){
    var revenueChart;
    fun();
    setInterval(fun,1000);
});
function fun(){
    //revenueChart.removeChild();
    $("#chartContainer").html("");
    $("#chartobject-1").css("display","none");
    $("#chartobject-1").remove();
    $(".fusioncharts-smartlabel-container").html("");
    $(".fusioncharts-smartlabel-container").remove();
    revenueChart =null;
    delete revenueChart;
    //CollectGarbage();

  FusionCharts.ready(function(){
    revenueChart = new FusionCharts({
        "type": "mscolumn2d",
        "renderAt": "chartContainer",
        "width": "1000",
        "height": "500",
        "dataFormat": "json",
        "dataSource":  {
        "chart": {
            "bgAlpha": "100",
            "theme": "my",
            "placeValuesInside": "0",
            "outCnvBaseFontSize": "14",
            "rotateValues": "0"
        },
        "categories": [
            {
                "category": [
                    {
                        "label": "Jan"
                    },
                    {
                        "label": "Feb"
                    },
                    {
                        "label": "Mar"
                    },
                    {
                        "label": "Sep"
                    },
                    {
                        "label": "Oct"
                    }
                ]
            }
        ],
        "dataset": [
            {
                "data": [
                    {
                        "value": "22400"
                    },
                    {
                        "value": "24800"
                    },
                    {
                        "value": "21800"
                    },
                    {
                        "value": "23700"
                    },
                    {
                        "value": "25900"
                    }
                ]
            },
            {
                "data": [
                    {
                        "value": "10000"
                    },
                    {
                        "value": "11500"
                    },
                    {
                        "value": "12500"
                    },
                    {
                        "value": "21700"
                    },
                    {
                        "value": "21900"
                    }
                ]
            }
        ]
    }
  });
revenueChart.render();
})
}

fusioncharts不是有setDataURL用于设置加载不同数据源，干嘛要不断的重新生产fusioncharts

 var chartObj = getChartFromId("chart1Id");
chartObj.setDataURL("nd.xml");