(* ￣)(￣▽￣*)ゞ

chart.setTransparent(true);

例子：

<script>
    var chart = new FusionCharts("js/FUSIONCHARTS.COM/FusionMapsXT/Maps/FCMap_China2.swf?r=" + new Date().getTime() , "ChartId"+ new Date().getTime() , "100%","100%");
    chart.setDataURL(dataPath);
    chart.setTransparent(true);
    //chart.updateChartURL(dataPath);
    chart.render(elementID);
</script>

注意，相应的xml文件要设