JS获取树的父节点及祖先节点

主体函数

export function findAllParent (node, tree, parentNodes = [], index = 0) {
  if (!node || node.fid === 0) {
    return
  }
  findParent(node, parentNodes, tree)
  let parentNode = parentNodes[index]
  findAllParent(parentNode, tree, parentNodes, ++index)
  return parentNodes
}

function findParent (node, parentNodes, tree) {
  for (let i = 0; i < tree.length; i++) {
    let item = tree[i]
    if (item.id === node.fid) {
      parentNodes.push(item)
      return
    }
    if (item.children && item.children.length > 0) {
      findParent(node, parentNodes, item.children)
    }
  }
}

export default findAllParent

调用方式

import findParentNodes from \'./test\'
let menuTreeData = [
　　{
　　　　id: 1,
　　　　fid: 0,
　　　　name: \'1\',
　　　　children: [
          {
            id: 11,
            fid: 1,
            name: \'1-1\',
            children: [
              { id: 111, fid: 11, name: \'1-1-1\' },
              { id: 112, fid: 11, name: \'1-1-2\' }
            ]
          },
　　　　　　{ id: 12, fid: 1, name: \'1-2\' }
　　　　]
　　},
　　{ id: 2, fid: 0, name: \'2\' }
]
let nodes = []
let parentNodes = findParentNodes({ id: 112, fid: 11 }, menuTreeData, nodes)
console.error(\'tag\', nodes.map(item => item.name))
console.error(\'tag\', parentNodes.map(item => item.name))

两种方式都可以获取到祖先节点的值