绘制vis.js网络时保持两个节点相邻

// 创建节点和边的数据集
var nodes = new vis.DataSet([
  { id: 1, label: 'Node 1' },
  { id: 2, label: 'Node 2' },
  { id: 3, label: 'Node 3' },
]);

var edges = new vis.DataSet([
  { id: 1, from: 1, to: 2 },
  { id: 2, from: 2, to: 3 },
]);

// 创建网络图实例
var container = document.getElementById('network');
var data = { nodes: nodes, edges: edges };
var options = {};
var network = new vis.Network(container, data, options);

// 创建布局实例
var layout = new vis.NetworkLayout(network, nodes);

// 计算节点位置
layout.start();

// 保持两个节点相邻
nodes.forEach(function (node) {
  var neighbors = network.getConnectedNodes(node.id);
  if (neighbors.length > 0) {
    var neighborPosition = layout.getPosition(neighbors[0]);
    layout.setPosition(node, neighborPosition);
  }
});