修改layui的后台模板的左侧导航栏可以伸缩

原生的左侧导航栏代码：

<div class="layui-side layui-bg-black">
    <div class="layui-side-scroll">
      
      <ul class="layui-nav layui-nav-tree"  lay-filter="test">
        <li class="layui-nav-item layui-nav-itemed">
          <a class="" href="javascript:;">所有商品a>
          <dl class="layui-nav-child">
            <dd><a href="javascript:;">列表一a>dd>
            <dd><a href="javascript:;">列表二a>dd>
            <dd><a href="javascript:;">列表三a>dd>
            <dd><a href="">超链接a>dd>
          dl>
        li>
        <li class="layui-nav-item">
          <a href="javascript:;">解决方案a>
          <dl class="layui-nav-child">
            <dd><a href="javascript:;">列表一a>dd>
            <dd><a href="javascript:;">列表二a>dd>
            <dd><a href="">超链接a>dd>
          dl>
        li>
        <li class="layui-nav-item"><a href="">云市场a>li>
        <li class="layui-nav-item"><a href="">发布商品a>li>
      ul>
    div>
  div>

自己修改的：

<div class="layui-side layui-bg-black">
    <div class="layui-side-scroll">
        <div title="菜单缩放" class="kit-side-fold"><i class="fa fa-navicon" aria-hidden="true">i>div>
        
        <ul class="layui-nav layui-nav-tree"  lay-filter="test">
            <li class="layui-nav-item layui-nav-itemed">
                <a class="" href="javascript:;"><i class="fa fa-user-circle-o fa-lg">i> <span >生源追踪span>a>
                <dl class="layui-nav-child">
                    <dd><a href="javascript:;"><i class="fa fa-list fa-lg">i> <span >生源列表span>a>dd>
                    <dd><a href="javascript:;"><i class="fa fa-clipboard fa-lg">i> <span >学校信息span>a>dd>
                    <dd><a href="javascript:;"><i class="fa fa-file-text fa-lg">i> <span >工做计划span>a>dd>
                dl>
            li>
            <li class="layui-nav-item">
                <a href="javascript:;"><i class="fa fa-vcard fa-lg">i> <span >学员管理span>a>
                <dl class="layui-nav-child">
                    <dd><a href="javascript:;"><i class="fa fa-th-list fa-lg">i> <span >学员列表span>a>dd>
                    <dd><a href="javascript:;"><i class="fa fa-user-o fa-lg">i> <span >考勤管理span>a>dd>
                    <dd><a href="javascript:;"><i class="fa fa-send-o fa-lg">i> <span >沟通计划span>a>dd>
                    <dd><a href="javascript:;"><i class="fa fa-frown-o fa-lg">i> <span >成绩管理span>a>dd>
                dl>
            li>
            <li class="layui-nav-item">
                <a href="javascript:;"><i class="fa fa-diamond fa-lg">i> <span >管理设置span>a>
                <dl class="layui-nav-child">
                    <dd><a href="javascript:;"><i class="fa fa-address-book fa-lg">i> <span >账号管理span>a>dd>
                    <dd><a href="javascript:;"><i class="fa fa-check-square fa-lg">i> <span >授权管理span>a>dd>
                dl>
            li>
            <li class="layui-nav-item">
                <a href="javascript:;"><i class="fa fa-gear fa-lg">i> <span >系统管理span>a>
                <dl class="layui-nav-child">
                    <dd><a href="javascript:;"><i class="fa fa-window-restore fa-lg">i> <span >系统信息span>a>dd>
                    <dd><a href="javascript:;"><i class="fa fa-database fa-lg">i> <span >操作日志span>a>dd>
                dl>
            li>
        ul>
    div>
div>

JQ代码：

<script>
    //JavaScript代码区域
    layui.use('element', function(){
        var element = layui.element;

    });
    var isShow = true;  //定义一个标志位
    $('.kit-side-fold').click(function(){
        //选择出所有的span，并判断是不是hidden
        $('.layui-nav-item span').each(function(){
            if($(this).is(':hidden')){
                $(this).show();
            }else{
                $(this).hide();
            }
        });
        //判断isshow的状态
        if(isShow){
            $('.layui-side.layui-bg-black').width(60); //设置宽度
            $('.kit-side-fold i').css('margin-right', '70%');  //修改图标的位置
            //将footer和body的宽度修改
            $('.layui-body').css('left', 60+'px');
            $('.layui-footer').css('left', 60+'px');
            //将二级导航栏隐藏
            $('dd span').each(function(){
                $(this).hide();
            });
            //修改标志位
            isShow =false;
        }else{
            $('.layui-side.layui-bg-black').width(200);
            $('.kit-side-fold i').css('margin-right', '10%');
            $('.layui-body').css('left', 200+'px');
            $('.layui-footer').css('left', 200+'px');
            $('dd span').each(function(){
                $(this).show();
            });
            isShow =true;
        }
    });

script>