amcharts访问XY系列图表中的数据

var chart = am4core.create("chartdiv", am4charts.XYChart);

chart.data = [{
  "category": "Category 1",
  "value": 10
}, {
  "category": "Category 2",
  "value": 20
}, {
  "category": "Category 3",
  "value": 15
}];

var series = chart.series.push(new am4charts.XYSeries());

series.dataFields.categoryX = "category";
series.dataFields.valueY = "value";