Element UI el-tree组件自定义复选框：如何实现第一个复选框的反选及父子节点联动？

handleSelectInvert() {
  if (this.treeData && this.treeData.length > 0) {
    const firstNode = this.treeData[0];
    firstNode.scanCheck = !firstNode.scanCheck;
    this.updateCheckStatus(firstNode); // 递归更新状态
  }
},

updateCheckStatus(node) {
  // 递归更新子节点
  if (node.children) {
    node.children.forEach(child => {
      child.scanCheck = node.scanCheck;
      this.updateCheckStatus(child);
    });
  }
  // 更新父节点状态 (根据实际需求调整)
  if (node.parent) {
    const parent = this.findNode(node.parent, this.treeData); // 查找父节点
    if (parent) {
      this.updateParentCheckStatus(parent);
    }
  }
},

findNode(nodeId, data) {
  // 递归查找节点
  for (let i = 0; i < data.length; i++) {
    if (data[i].id === nodeId) {
      return data[i];
    }
    if (data[i].children) {
      const foundNode = this.findNode(nodeId, data[i].children);
      if (foundNode) {
        return foundNode;
      }
    }
  }
  return null;
},

updateParentCheckStatus(node) {
  // 根据子节点状态更新父节点scanCheck (例如：所有子节点都选中，则父节点选中)
  const allChildrenChecked = node.children.every(child => child.scanCheck);
  node.scanCheck = allChildrenChecked;
  if (node.parent) {
    this.updateParentCheckStatus(this.findNode(node.parent, this.treeData));
  }
}