在vis-network中，如何在选中或鼠标悬停时禁用颜色更改

// 创建vis-network实例
var container = document.getElementById('network');
var data = {
  nodes: [
    { id: 1, label: 'Node 1' },
    { id: 2, label: 'Node 2' },
    { id: 3, label: 'Node 3' }
  ],
  edges: [
    { from: 1, to: 2 },
    { from: 1, to: 3 }
  ]
};
var options = {};
var network = new vis.Network(container, data, options);

// 添加事件监听器
network.on('selectNode', function(event) {
  var selectedNodeId = event.nodes[0];
  
  // 判断是否需要禁用颜色更改
  if (selectedNodeId === 1) {
    return; // 禁用颜色更改
  }
  
  // 修改节点颜色
  var node = network.body.nodes[selectedNodeId];
  node.setOptions({ color: { background: 'red' } });
});

network.on('hoverNode', function(event) {
  var hoverNodeId = event.node;
  
  // 判断是否需要禁用颜色更改
  if (hoverNodeId === 1) {
    return; // 禁用颜色更改
  }
  
  // 修改节点颜色
  var node = network.body.nodes[hoverNodeId];
  node.setOptions({ color: { background: 'blue' } });
});