用 Vue.js 递归组件实现可折叠的树形菜单(demo)

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

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
  },
  ponents: {
   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',
   puted: {
    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',
   puted: {
    indent() {
     return { transform: `translate(${this.depth  50}px)` }
    }
   },
   methods: {
    toggleChildren() {
     this.showChildren = !this.showChildren;
    }
   }
  }
 </script>