layui自定义ajax左侧三级菜单

<!-- 左侧的菜单 -->
<div class="layui-side layui-bg-black" id="admin-side">
 <div class="layui-side-scroll" id="admin-navbar-side" lay-filter="side">
  
  
 </div>
</div>

<!-- 右侧tab选项卡和内容 -->                  
<div class="layui-body" style="bottom: 0;border-left: solid 2px #1AA094;" id="admin-body">
 <div class="layui-tab admin-nav-card layui-tab-brief" lay-filter="admin-tab" lay-allowclose="true">
 <ul class="layui-tab-title"> <!-- tab选项卡标题 -->
 <li class="layui-this">
 <i class="fa fa-dashboard" aria-hidden="true"></i>
 <cite>控制面板</cite>
 </li>
 </ul>
 <div class="layui-tab-content" style="min-height: 150px; padding: 5px 0 0 0;"> <!-- tab选项卡内容 -->
 <div class="layui-tab-item layui-show">
 <iframe src="/UploadFiles/2021-04-02/main.html">

js代码：需引入 layui.all.js




var $ = layui.jquery,
 element = layui.element(),
 form = layui.form();
var html = '';
//获取菜单
$.ajax({
 url:"../manage/permissionList",
 type:"post",
 dataType:"json",
 data:{},
 success:function(data){
 var navs=data.result;
 $.each(navs,function(i,item){
 html += '<dl>';
 html += '<dt><a href="javascript:;" data-url="'+item.url+'" nav-id="'+item.id+'"><i class="'+item.icon+'"></i><cite>'+item.title+'</cite></a></dt>';
 //如果有第二级菜单
 if(item.children !== undefined && item.children.length > 0){
 $.each(item.children,function(j,item2){
  html += '<dd>';
  html += '<a href="javascript:;" data-url="'+item2.url+'" nav-id="'+item2.id+'"><i class="'+item2.icon+'"></i><cite>'+item2.title+'</cite></a>';
  //如果有三级菜单
  if(item2.children !== undefined && item2.children.length > 0){
  html += '<ul>';
  $.each(item2.children,function(k,item3){
  html += '<li>'+
   '<a href="javascript:;" data-url="'+item3.url+'" nav-id="'+item3.id+'">'+
   '<i class="'+item3.icon+'"></i>'+
   '<cite>'+item3.title+'</cite>'+
   '</a>'+
   '</li>';
  });
  html += '</ul>';
  }
  html += '</dd>';
 });
 }
 html += '</dl>';
 });
 //渲染html
 $('#admin-navbar-side').html(html); 
 }
});
 
//触发事件
var active = {
 tabAdd: function(obj){
  //新增一个Tab项
  element.tabAdd('admin-tab', {
  title: $(this).html()//用于演示
  ,content: '<iframe src="/UploadFiles/2021-04-02/'+$(this).attr('data-url')+'">

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