Vue递归实现树形菜单方法实例

const routes = [
 {
 name: 'home',
 path: '/home',
 meta: { text: '首页' }
 },
 {
 name: 'inner',
 path: '/inner',
 meta: { text: '内部平台' },
 children: [
  {
  name: 'oa',
  path: 'oa',
  meta: { text: 'OA' }
  },
  {
  name: 'jira',
  path: 'jira',
  meta: { text: 'Jira' }
  },
  {
  name: 'wiki',
  path: 'wiki',
  meta: { text: 'Wiki' }
  },
  {
  name: 'caiwu',
  path: 'caiwu',
  meta: { text: '财务' },
  children: [
   {
   name: 'chailv',
   path: 'chailv',
   meta: { text: '差旅' }
   },
   {
   name: 'richang',
   path: 'richang',
   meta: { text: '日常' },
   children: [
    {
    name: 'taxi',
    path: 'taxi',
    meta: { text: '交通' }
    },
    {
    name: 'tel',
    path: 'tel',
    meta: { text: '通信' }
    }
   ]
   }
  ]
  }
 ]
 },
 {
 name: 'sec',
 path: '/sec',
 meta: { text: '审核' },
 children: [
  {
  name: 'acl',
  path: '/acl',
  meta: { text: 'ACL' }
  }
 ]
 }
]

render (r) {
 return r(
  'el-menu',
  {
  props: {
   backgroundColor: "#545c64",
   textColor: "#fff",
   activeTextColor: "#ffd04b"
  },
  on: {
   select: this.onSelect
  }
  },
  this.elements(this.routes, r)
 )
 }

elements (routes, r) {
  return routes
  .map(route => {
   if (!route.paths) route.paths = []
   if (route.children && route.children.length) {
   return r(
    'el-submenu',
    {
    props: {
     index: route.name
    }
    },
    [
    r(
     'span',
     {
     slot: 'title'
     },
     [
     route.meta.text
     ]
    ),
    this.elements(route.children, r)
    ]
   )
   } else if (route.path) {
   return r(
    'el-menu-item',
    {
    props: {
     index: route.name
    }
    },
    [
    route.meta.text
    ]
   )
   } else {
   return null
   }
  })
  .filter(item => item)
 }