amcharts -在类别之间添加刻度

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

// 创建类别轴
var categoryAxis = chart.xAxes.push(new am4charts.CategoryAxis());
categoryAxis.dataFields.category = "category";
categoryAxis.renderer.grid.template.location = 0;
categoryAxis.renderer.grid.template.stroke = am4core.color("#000");
categoryAxis.renderer.grid.template.strokeOpacity = 0.1;
categoryAxis.renderer.minGridDistance = 30;
categoryAxis.renderer.labels.template.rotation = -90;

// 设置刻度线的位置为"middle"
categoryAxis.renderer.grid.template.location = 0.5;

// 创建值轴和柱状图系列
var valueAxis = chart.yAxes.push(new am4charts.ValueAxis());
var series = chart.series.push(new am4charts.ColumnSeries());
series.dataFields.categoryX = "category";
series.dataFields.valueY = "value";
series.columns.template.width = am4core.percent(80);

// 添加数据
chart.data = [{
  "category": "类别1",
  "value": 100
}, {
  "category": "类别2",
  "value": 200
}, {
  "category": "类别3",
  "value": 300
}, {
  "category": "类别4",
  "value": 400
}];

// 刷新图表
chart.invalidateData();