如何在amcharts v4中单击时突出显示单个条形图

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

// 创建柱状图实例
var chart = am4core.create("chartdiv", am4charts.XYChart);

// 设置数据源
chart.data = [{
  "category": "类别1",
  "value": 100
}, {
  "category": "类别2",
  "value": 200
}, {
  "category": "类别3",
  "value": 150
}];

// 创建类别轴
var categoryAxis = chart.xAxes.push(new am4charts.CategoryAxis());
categoryAxis.dataFields.category = "category";

// 创建值轴
var valueAxis = chart.yAxes.push(new am4charts.ValueAxis());

// 创建柱状图系列
var series = chart.series.push(new am4charts.ColumnSeries());
series.dataFields.valueY = "value";
series.dataFields.categoryX = "category";
series.columns.template.tooltipText = "{categoryX}: [bold]{valueY}[/]";

// 设置点击事件
series.columns.template.events.on("hit", function(ev) {
  // 清除之前的高亮状态
  chart.series.each(function(item) {
    item.columns.template.setState("default");
  });
  
  // 设置当前点击的柱状图为高亮状态
  ev.target.setState("active");
});

// 销毁图表实例
chart.dispose();