一、主要运用element封装的控件并封装成组件运用，如图所示

代码如图所示：

下面是子组件的代码：

<template> <ul class="l_tree"> <li class="l_tree_branch" v-for="item in model" :key="item.id"> <div class="l_tree_click"> <button type="button" class="l_tree_children_btn" v-if="item.children" @click="toggle(item)">{{ !item.show ? '-' : '+' }}</button> <span class="l_folder" @click="clickSize(item.id)" :class="current === item.id ? 'current' : 'currentSize'">{{ item.name }}</span> </div> <ew-tree v-show="!item.show" :model="item.children" :current="current" @change="changeCurrent"></ew-tree> </li> </ul></template><script>export default { name: 'EwTree', props: { model: { type: Array, default() { return [] } }, current: { type: String, default: '' } }, methods: { toggle(item) { console.log(item) var idx = this.model.indexOf(item) this.$set(this.model[idx], 'show', !item.show) }, clickSize(id) { console.log(1, id) this.$emit('change', id) }, changeCurrent(id) { this.clickSize(id) } }, mounted() { }}</script><style lang="less" scoped>*{ box-sizing: border-box; margin: 0;padding: 0;}*:before,*:after{ box-sizing: border-box;}ul,li { list-style: none;}.current{ color: #e9c309 !important}.l_tree_container { width: 100%; height: 100%; box-shadow: 0 0 3px #ccc; margin: 13px; position: relative;}.l_tree { width: calc(100%); padding-left: 15px;}.l_tree_branch { width: 100%; height: 100%; display: block; padding: 13px; position: relative;}.l_tree_branch .l_tree_children_btn { width: 12px; height: 12px; background-color: #515a68; font-size: 8px; text-align: center; color: #bbbec1; outline: none; border: 0; cursor: pointer; border: 1px solid #bbbec1; line-height: 11px; margin-left: 5px;}ul.l_tree:before { content: ''; border-left: 1px dashed #999999; height: calc(100% - 24px); position: absolute; left: 10px; top: 0px;}.l_tree,.l_tree_branch { position: relative;}.l_tree_branch::after { content: ''; width: 18px; height: 0; border-bottom: 1px dashed #bbbec1; position: absolute; right: calc(100% - 10px); top: 24px; left: -5px;}.l_tree_container>.l_tree::before,.l_tree_container>.l_tree>.l_tree_branch::after { display: none;}.l_folder { font-size:11px; margin-left: 5px; display: inline; color: #bbbec1; cursor: pointer;}</style>

主要难点是：current传值问题，所以current绑定在父组件

父组件中的值和方法：

当然在运行npm时是需要安装npm install ewtree -S,实现组件化

最终效果如下：

总结

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