要使AmCharts4的numberFormatter百分比起作用，您可以按照以下步骤进行操作：

步骤1：导入必要的库

import * as am4core from "@amcharts/amcharts4/core";
import * as am4charts from "@amcharts/amcharts4/charts";
import am4themes_animated from "@amcharts/amcharts4/themes/animated";

步骤2：初始化AmCharts

am4core.useTheme(am4themes_animated);
am4core.options.autoSetClassName = true;

步骤3：创建图表实例

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

步骤4：创建数据序列

let series = chart.series.push(new am4charts.ColumnSeries());
series.dataFields.valueY = "value";
series.dataFields.categoryX = "category";

步骤5：创建百分比格式化器

let numberFormatter = new am4core.NumberFormatter();
numberFormatter.numberFormat = "#.#'%'";
series.numberFormatter = numberFormatter;

以上代码演示了如何使用AmCharts4的numberFormatter来将数据格式化为百分比。您可以根据自己的需求进行修改和扩展。请确保已将AmCharts库正确引入，并将代码放置在适当的位置。