要将AmCharts的柱状图方向相反，可以使用以下代码示例：

HTML:

JavaScript:

// 创建图表实例
var chart = am4core.create("chartdiv", am4charts.XYChart);

// 将柱状图方向设置为相反
chart.reverseCategories = true;

// 添加数据
chart.data = [{
  "category": "A",
  "value": 10
}, {
  "category": "B",
  "value": 20
}, {
  "category": "C",
  "value": 15
}];

// 创建类目轴
var categoryAxis = chart.xAxes.push(new am4charts.CategoryAxis());
categoryAxis.dataFields.category = "category";
categoryAxis.renderer.grid.template.location = 0;

// 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.name = "Value";
series.columns.template.tooltipText = "{categoryX}: [bold]{valueY}[/]";

// 添加柱状图的列模板
var columnTemplate = series.columns.template;
columnTemplate.strokeWidth = 2;
columnTemplate.strokeOpacity = 1;

// 渲染图表
chart.render();

通过将chart.reverseCategories属性设置为true，可以实现柱状图方向相反的效果。