由于做项目的需要，把一个线性数组转成树形数组，在网上查了很多文章，觉得他们写的太复杂了，于是自己写了一个，在折腾了一下午终于把它写出来啦（激动.gif），用两个filter过滤器就搞定了，代码简洁明了，数据结构小白都能看懂。
js代码：把扁平数据转成树形数据
function setTreeData(source){
let cloneData = JSON.parse(JSON.stringify(source)) // 对源数据深度克隆
return cloneData.filter(father=>{ // 循环所有项，并添加children属性
let branchArr = cloneData.filter(child=> father.id == child.parentId); // 返回每一项的子级数组
branchArr.length>0 "htmlcode">
function treeData(source, id, parentId, children){
let cloneData = JSON.parse(JSON.stringify(source))
return cloneData.filter(father=>{
let branchArr = cloneData.filter(child => father[id] == child[parentId]);
branchArr.length>0 "text-align: center">
vue组件：
<template>
<el-tree
:data="treeData"
:props="defaultProps"
accordion
@node-click="handleNodeClick">
</el-tree>
</template>
<script>
export default {
name: "Test",
data(){
return {
data : [
{id:1,parentId:0,name:"一级菜单A",rank:1},
{id:2,parentId:0,name:"一级菜单B",rank:1},
{id:3,parentId:0,name:"一级菜单C",rank:1},
{id:4,parentId:1,name:"二级菜单A-A",rank:2},
{id:5,parentId:1,name:"二级菜单A-B",rank:2},
{id:6,parentId:2,name:"二级菜单B-A",rank:2},
{id:7,parentId:4,name:"三级菜单A-A-A",rank:3},
{id:8,parentId:7,name:"四级菜单A-A-A-A",rank:4},
{id:9,parentId:8,name:"五级菜单A-A-A-A-A",rank:5},
{id:10,parentId:9,name:"六级菜单A-A-A-A-A-A",rank:6},
{id:11,parentId:10,name:"七级菜单A-A-A-A-A-A-A",rank:7},
{id:12,parentId:11,name:"八级菜单A-A-A-A-A-A-A-A",rank:8},
{id:13,parentId:12,name:"九级菜单A-A-A-A-A-A-A-A-A",rank:9},
{id:14,parentId:13,name:"十级菜单A-A-A-A-A-A-A-A-A-A",rank:10},
],
defaultProps: {
children: 'children',
label: 'name'
}
}
},
computed:{
treeData(){
let cloneData = JSON.parse(JSON.stringify(this.data)) // 对源数据深度克隆
return cloneData.filter(father=>{
let branchArr = cloneData.filter(child=>father.id == child.parentId) //返回每一项的子级数组
branchArr.length>0 "_blank" href="https://github.com/KBeginner/Coder/blob/v2018/JavaScript/js%E6%A0%91%E5%BD%A2%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84/Test.html" rel="external nofollow" >Demo
树形数据转成扁平数据，请查看这篇文章：js实现树形数据转成扁平数据