需求

一个页面，要显示商品分类，同时每个分类下面还拥有若干子类，子类也可以有子类。
要实现全选单选，子类被逐个全选父类也要标记选中。
第一反应就是树形结构，和递归调用。曾经在做WPF时记得有现成的组件，也学着写过对应的后台。这次我要自己写一个前端的组件了。
这只是我自己花了点时间写的一个vue组件，尚可优化及拓展。仅此与大家分享一下。

效果

实现

<template>
  <div id="TreeMenu">
    <div v-for="(node, index) in nodes" :class="{'TreeMenu-row-border-bottom': !depth}">
      <div class="TreeMenu-row">
        <img class="TreeMenu-row-selectimg" src="../assets/img/MembersPriceActivity/selected.png" @click="selectNode(0,node)" v-show="node.IsSelected"/>
        <img class="TreeMenu-row-selectimg" src="../assets/img/MembersPriceActivity/select.png" @click="selectNode(1,node)" v-show="!node.IsSelected"/>
        <div class="TreeMenu-row-firstdiv" :class="{'TreeMenu-row-border-bottom': node.ChildTypeList&&node.IsExpanded }"  @click="expandNode(!node.IsExpanded,node)">
          <label v-text="node.Name"></label>
          <img class="TreeMenu-row-arrowimg" src="../assets/img/MembersPriceActivity/top.png" v-if="node.ChildTypeList" v-show="!node.IsExpanded">
          <img class="TreeMenu-row-arrowimg" src="../assets/img/MembersPriceActivity/down.png" v-if="node.ChildTypeList" v-show="node.IsExpanded">
        </div>
        <TreeMenu :nodes="node.ChildTypeList" :fatherIndex="index" :depth="depth+1" v-on:selectFatherNode="selectFatherNode" v-if="node.ChildTypeList" v-show="!node.IsExpanded"></TreeMenu>
      </div>
    </div>
  </div>
</template>

<script>
  export default{
    name: 'TreeMenu',
    data () {
      return {
        goodstype: {
          ID: '',
          ParentID: '',
          Name: '',
          Code: '',
          Level: 0,
          ImgUrl: null,
          ChildTypeList: []
        }
      }
    },
    props: {
      nodes: {
        type: Array,
        default: () => {
          return []
        }
      },
      fatherIndex: {
        type: Number,
        default: 0
      },
      depth: {
        type: Number,
        default: 0
      }
    },
    watch: {},
    created () {},
    mounted () {},
    destroyed () {},
    methods: {
      // 选中/取消 当前节点
      selectNode (choice, node) {
        node.IsSelected = choice
        this.selectChildrenNode(choice, node.ChildTypeList || [])
        this.$emit('selectFatherNode', choice, this.fatherIndex, this.nodes.every((node) => { return node.IsSelected === choice }))
      },
      // 子节点修改选中状态
      selectChildrenNode (choice, nodes, self) {
        let _self = self || this
        nodes.forEach((node) => { node.IsSelected = choice; _self.selectChildrenNode(choice, node.ChildTypeList || [], _self) })
      },
      // 作为父级节点检查是否需要修改选中状态(仅用于子节点调用)
      selectFatherNode (choice, index, childrenState) {
        if (choice) {
          // 若其[Index]节点下子节点均为被选中状态，该[Index]节点就应该被选中
          if (childrenState) {
            this.nodes[index].IsSelected = choice
            this.$emit('selectFatherNode', choice, this.fatherIndex, this.nodes.every((node) => { return node.IsSelected === choice }))
          }
        } else {
          // 若其[Index]节点下子节点有未被选中状态的，该[Index]节点就应该未选中
          this.nodes[index].IsSelected = choice
          this.$emit('selectFatherNode', choice, this.fatherIndex, false)
        }
      },
      // 展开/收起 当前节点
      expandNode (choice, node) {
        node.IsExpanded = choice
        if (!choice) {
          this.expandChildrenNode(choice, node.ChildTypeList)
        }
      },
      // 子节点收起
      expandChildrenNode (choice, nodes, self) {
        let _self = self || this
        nodes.forEach((node) => { node.IsExpanded = choice; _self.expandChildrenNode(choice, node.ChildTypeList || [], _self) })
      }
    }
  }
</script>

<style lang="scss" scoped>
  #TreeMenu {
    .TreeMenu-row{
      margin-left: 30px;
      font-size: 15px;
      padding: 12px 0 0 0;
    }
    .TreeMenu-row-firstdiv{
      height: 32px;
      margin-left: 30px;
    }
    .TreeMenu-row-arrowimg{
      float: right;
      margin-right: 15px;
      width: 13px;
    }
    .TreeMenu-row-selectimg{
      float: left;
      width: 18px;
      vertical-align: text-bottom;
    }
    .TreeMenu-row-border-bottom{
      border-bottom: solid 1px #e6e6e6;
    }
    .TreeMenu-row-border-top{
      border-top: solid 1px #e6e6e6;
    }
  }
</style>

createtime：2018-12-02