import Vue from 'vue'
import App from './App'
new Vue({
 el: '#app',
 template: '<App/>',
 components: { App }
})

<template>
 <div id="app">
 <li v-for="folder in folders">
 <tree-folder v-bind:folder="folder"></tree-folder>
 </li>
 </div>
</template>
<script>
 import TreeFolder from './components/tree-folder'
 export default {
 data: function () {
 return {
 folders: [
  {
  name: 'folder1',
  children: [{
  name: 'folder1 - folder1',
  children: [{
  name: 'folder1 - folder1 - folder1'
  }]
  }, {
  name: 'folder1 - folder2',
  children: [{
  name: 'folder1 - folder2 - folder1'
  }, {
  name: 'folder1 - folder2 - folder2'
  }]
  }]
  },
  {
  name: 'folder 2',
  children: [{
  name: 'folder2 - folder1',
  children: [{
  name: 'folder2 - folder1 - folder1'
  }]
  }, {
  name: 'folder2 - folder2',
  children: [{
  name: 'folder2-content1'
  }]
  }]
  },
  {
  name: 'folder 3',
  children: [{
  name: 'folder3 - folder1',
  children: [{
  name: 'folder3 - folder1 - folder1'
  }]
  }, {
  name: 'folder3 - folder2',
  children: [{
  name: 'folder3-content1'
  }]
  }]
  }
 ]
 }
 },
 components: {
 TreeFolder
 }
 }
</script>

<template>
 <p>
 <span>{{ folder.name }}</span>
 <tree-folder-contents :children="folder.children"></tree-folder-contents>
 </p>
</template>
<script>
 // 官方文档：「在我们的例子中，将 tree-folder 组件做为切入起点。我们知道制造矛盾的是 tree-folder-contents 子组件，所以我们在 tree-folder 组件的生命周期钩子函数 beforeCreate 中去注册 tree-folder-contents 组件」
 export default {
 props: ['folder'],
 data: function () {
  return {}
 },
 beforeCreate: function () {
 // 官方文档给出的是require
 // this.$options.components.TreeFolderContents = require('./tree-folder-contents.vue')
 // 在基于vue-cli@2.8.1按照上面的写法还是会报错
 // Failed to mount component: template or render function not defined.
 // 所以我们应该改为基于es6的写法异步加载一个组件如下
  this.$options.components.TreeFolderContents = () => import('./tree-folder-contents.vue')
 }
 }
</script>

<template>
 <ul>
 <li v-for="child in children">
  <tree-folder v-if="child.children" :folder="child"></tree-folder>
  <span v-else>{{ child.name }}</span>
 </li>
 </ul>
</template>
<script>
 import TreeFolder from './tree-folder'
 export default {
 props: ['children'],
 components: {
  TreeFolder
 }
 }
</script>