<template>
 <div class="org-tree-node">
 <div class="org-tree-node-label">{{data.label}}</div>
  <div class="org-tree-node-children" v-if="data.children">
  <org-tree-node v-for="node in data.children" :data="node" :key="data.id"></org-tree-node>
 </div>
 </div>
</template>
<script>
 export default {
 name: 'OrgTreeNode',
 props: {
  data: Object
 }
 }
</script>
<style>
 /* ... */
</style>

<template>
 <div class="org-tree-node">
 <div class="org-tree-node-label">
  <slot>{{data.label}}</slot>
 </div> 
 <div class="org-tree-node-children" v-if="data.children">
  <org-tree-node v-for="node in data.children" :data="node" :key="data.id"></org-tree-node>
 </div>
 </div>
</template>
<script>
 export default {
 name: 'OrgTreeNode',
 props: {
  data: Object
 }
 }
</script>
<style>
 /* ... */
</style>

export const render = (h, context) => {
 const {props} = context
 return renderNode(h, props.data, context)
}

export const renderNode = (h, data, context) => {
 const {props} = context
 const childNodes = []
 childNodes.push(renderLabel(h, data, context))
 if (props.data.children && props.data.children.length) {
 childNodes.push(renderChildren(h, props.data.children, context))
 }
 return h('div', {
 domProps: {
 className: 'org-tree-node'
 }
 }, childNodes)
}

export const renderLabel = (h, data, context) => {
 const {props} = context
 const renderContent = props.renderContent
 const childNodes = []
 // 节点label定制，由调用者传入的renderContent实现
 if (typeof renderContent === 'function') {
 let vnode = renderContent(h, props.data)
 vnode && childNodes.push(vnode)
 } else {
 childNodes.push(props.data.label)
 }
 return h('div', {
 domProps: {
 className: 'org-tree-node-label'
 }
 }, childNodes)
}

export const renderChildren = (h, list, context) => {
 if (Array.isArray(list) && list.length) {
 const children = list.map(item => {
 return renderNode(h, item, context)
 })
 return h('div', {
 domProps: {
 className: 'org-tree-node-children'
 }
 }, children)
 }
 return ''
}

<template>
 <!-- ... -->
</template>
<script>
 import render from './node.js'
 export default {
 name: 'OrgTree',
 components: {
  OrgTreeNode: {
  render,
  // 定义函数式组件
  functional: true
  }
 }
 }
</script>