Vue.js递归组件构建树形菜单

Vue.component('recursive-component', {
 template: `<!--Invoking myself!-->
    <recursive-component></recursive-component>
 });

let tree = {
 label: 'root',
 nodes: [
  {
  label: 'item1',
  nodes: [
   {
   label: 'item1.1'
   },
   {
   label: 'item1.2',
   nodes: [
    {
    label: 'item1.2.1'
    }
   ]
   }
  ]
  }, 
  {
  label: 'item2' 
  }
 ]
 }

<template>
 <div class="tree-menu">
  <div>{{ label }}</div>
  <tree-menu 
  v-for="node in nodes" 
  :nodes="node.nodes"
  :label="node.label"
  >
  </tree-menu>
 </div>
 </template>
 <script>
 export default { 
  props: [ 'label', 'nodes' ],
  name: 'tree-menu'
 }
 </script>

<template>
 <div class="tree-menu">
  ...
  <!--If `nodes` is undefined this will not render-->
  <tree-menu v-for="node in nodes"></tree-menu>
 </template>

 import TreeMenu from './TreeMenu.vue'
 let tree = {
 ...
 }
 new Vue({
 el: '#app',
 data: {
  tree
 },
 components: {
  TreeMenu
 }
 })

<div id="app">
 <tree-menu :label="tree.label" :nodes="tree.nodes"></tree-menu>
 </div>

<template>
 <div class="tree-menu">
  <div :style="indent">{{ label }}</div>
  <tree-menu 
  v-for="node in nodes" 
  :nodes="node.nodes" 
  :label="node.label"
  :depth="depth + 1"
  >
  </tree-menu>
 </div>
 </template>
 <script>
 export default { 
  props: [ 'label', 'nodes', 'depth' ],
  name: 'tree-menu',
  computed: {
  indent() {
   return { transform: `translate(${this.depth * 50}px)` }
  }
  }
 }
 </script>

<div id="app">
 <tree-menu 
  :label="tree.label" 
  :nodes="tree.nodes"
  :depth="0"
 ></tree-menu>
 </div>

<template>
 <div class="tree-menu">
  <div :style="indent" @click="toggleChildren">{{ label }}</div>
  <tree-menu 
  v-if="showChildren"
  v-for="node in nodes" 
  :nodes="node.nodes" 
  :label="node.label"
  :depth="depth + 1"
  >
  </tree-menu>
 </div>
 </template>
 <script>
 export default { 
  props: [ 'label', 'nodes', 'depth' ],
  data() {
  return { showChildren: false }
  },
  name: 'tree-menu',
  computed: {
  indent() {
   return { transform: `translate(${this.depth * 50}px)` }
  }
  },
  methods: {
  toggleChildren() {
   this.showChildren = !this.showChildren;
  }
  }
 }
 </script>