amchart4正在跳过数据中的列

let data = [
  { date: new Date(2021, 0, 1), value1: 10, value2: 20 },
  { date: new Date(2021, 0, 2), value1: 15, value2: 25 },
  // 确保所有列都有数据
];

let data = [
  { date: new Date(2021, 0, 1), value1: 10, value2: 20 },
  { date: new Date(2021, 0, 2), value1: 15, value2: null }, // value2 缺失
];

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

let dateAxis = chart.xAxes.push(new am4charts.DateAxis());
let valueAxis = chart.yAxes.push(new am4charts.ValueAxis());

let series1 = chart.series.push(new am4charts.LineSeries());
series1.dataFields.dateX = "date";
series1.dataFields.valueY = "value1";
series1.strokeWidth = 2;
series1.minBulletDistance = 10;

let series2 = chart.series.push(new am4charts.LineSeries());
series2.dataFields.dateX = "date";
series2.dataFields.valueY = "value2";
series2.strokeWidth = 2;
series2.minBulletDistance = 10;

let dataSet = new am4core.DataSet();
dataSet.data = data;
dataSet.fieldMappings = [
  { fromField: "value1", toField: "value1" },
  { fromField: "value2", toField: "value2" }
];
chart.data = dataSet.data;