如何在amcharts 4中基于ajax数据改变烛台的颜色？

<script src="https://cdn.amcharts.com/lib/4/core.js"></script>
<script src="https://cdn.amcharts.com/lib/4/charts.js"></script>
<script src="https://cdn.amcharts.com/lib/4/themes/animated.js"></script>

<div id="chartdiv"></div>

// 使用ajax获取数据
$.ajax({
  url: 'your_data_url',
  method: 'GET',
  dataType: 'json',
  success: function(data) {
    // 处理数据并更新烛台的颜色
    var chart = am4core.create("chartdiv", am4charts.XYChart);
    chart.data = data;

    var series = chart.series.push(new am4charts.CandlestickSeries());
    series.dataFields.dateX = "date";
    series.dataFields.valueY = "value";
    series.dataFields.openValueY = "open";
    series.dataFields.lowValueY = "low";
    series.dataFields.highValueY = "high";
    series.simplifiedProcessing = true;
    series.riseFromOpenState = undefined;
    series.dropFromOpenState = undefined;

    // 根据数据的值来设置烛台的颜色
    series.riseFromPreviousState.properties.fill = am4core.color("#00FF00");
    series.dropFromPreviousState.properties.fill = am4core.color("#FF0000");

    chart.cursor = new am4charts.XYCursor();

    // 添加图例
    chart.legend = new am4charts.Legend();
  },
  error: function(xhr, status, error) {
    console.log(error);
  }
});