vue2 树形数据，最后一集添加标识

function addTreeFn(treeData, type1) {
  treeData.forEach((node) => {
    if (node.children && node.children.length > 0) {
      addTreeFn(node.children, type1)
    } else {
      node.sos = type1
    }
  })
}
   addTreeFn(this.list, '1')