amCharts4 -如何在强制定向树中设置节点之间的单个链接/边的样式？

// 引入amCharts4库
import * as am4core from "@amcharts/amcharts4/core";
import * as am4plugins_forceDirected from "@amcharts/amcharts4/plugins/forceDirected";

// 创建强制定向树图表对象
let chart = am4core.create("chartdiv", am4plugins_forceDirected.ForceDirectedTree);

// 创建节点样式
let nodeTemplate = chart.nodes.template;
nodeTemplate.width = 20;
nodeTemplate.height = 20;
nodeTemplate.fill = am4core.color("#1f77b4");

// 创建链接/边的样式
let linkTemplate = chart.links.template;
linkTemplate.strokeWidth = 2;
linkTemplate.stroke = am4core.color("#ccc");

// 获取节点之间的链接/边
let link = chart.links.getIndex(0); // 假设获取第一个链接/边

// 设置链接/边的样式
link.strokeWidth = 4;
link.stroke = am4core.color("#ff0000");