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准备好需要用到的图标。

新建html文档。

书写hmtl代码。

<div class="nav">

  <div class="nav-top">

    <div id="mini" style="border-bottom:1px solid rgba(255,255,255,.1)"><img src="images/mini.png" ></div>

  </div>

  <ul>

    <li class="nav-item"> <a href="javascript:;"><i class="my-icon nav-icon icon_1"></i><span>网站配置</span><i class="my-icon nav-more"></i></a>

      <ul>

        <li><a href="javascript:;"><span>网站设置</span></a></li>

        <li><a href="javascript:;"><span>友情链接</span></a></li>

        <li><a href="javascript:;"><span>分类管理</span></a></li>

        <li><a href="javascript:;"><span>系统日志</span></a></li>

      </ul>

    </li>

    <li class="nav-item"> <a href="javascript:;"><i class="my-icon nav-icon icon_2"></i><span>文章管理</span><i class="my-icon nav-more"></i></a>

      <ul>

        <li><a href="javascript:;"><span>站内新闻</span></a></li>

        <li><a href="javascript:;"><span>站内公告</span></a></li>

        <li><a href="javascript:;"><span>登录日志</span></a></li>

      </ul>

    </li>

    <li class="nav-item"> <a href="javascript:;"><i class="my-icon nav-icon icon_3"></i><span>订单管理</span><i class="my-icon nav-more"></i></a>

      <ul>

        <li><a href="javascript:;"><span>订单列表</span></a></li>

        <li><a href="javascript:;"><span>打个酱油</span></a></li>

        <li><a href="javascript:;"><span>也打酱油</span></a></li>

      </ul>

    </li>

  </ul>

</div>

书写css代码。

*,body, html {height: 100%;background: #E2E2E2}

body, ul { margin: 0; padding: 0 }

body { font: 14px "微软雅黑", "宋体", "Arial Narrow", HELVETICA; -webkit-text-size-adjust: 100%; }

li { list-style: none }

a { text-decoration: none; }

.nav { width: 220px; height: 100%; background: #263238; transition: all .3s; }

.nav a { display: block; overflow: hidden; padding-left: 20px; line-height: 46px; max-height: 46px; color: #ABB1B7; transition: all .3s; }

.nav a span { margin-left: 30px; }

.nav-item { position: relative; }

.nav-item.nav-show { border-bottom: none; }

.nav-item ul { display: none; background: rgba(0,0,0,.1); }

.nav-item.nav-show ul { display: block; }

.nav-item>a:before { content: ""; position: absolute; left: 0px; width: 2px; height: 46px; background: #34A0CE; opacity: 0; transition: all .3s; }

.nav .nav-icon { font-size: 20px; position: absolute; margin-left: -1px; }

.icon_1::after { content: "\e62b"; }

.icon_2::after { content: "\e669"; }

.icon_3::after { content: "\e61d"; }

.nav-more { float: right; margin-right: 20px; font-size: 12px; transition: transform .3s; }

.nav-more::after { content: "\e621"; }

.nav-show .nav-more { transform: rotate(90deg); }

.nav-show, .nav-item>a:hover { color: #FFF; background: rgba(0,0,0,.1); }

.nav-show>a:before, .nav-item>a:hover:before { opacity: 1; }

.nav-item li:hover a { color: #FFF; background: rgba(0, 0, 0,.1); }

.nav-mini.nav { width: 60px; }

.nav-mini.nav .nav-item>a span { display: none; }

.nav-mini.nav .nav-more { margin-right: -20px; }

.nav-mini.nav .nav-item ul { position: absolute; top: 0px; left: 60px; width: 180px; z-index: 99; background: #3C474C; overflow: hidden; }

.nav-mini.nav .nav-item:hover { background: rgba(255,255,255,.1); }

.nav-mini.nav .nav-item:hover .nav-item a { color: #FFF; }

.nav-mini.nav .nav-item:hover a:before { opacity: 1; }

.nav-mini.nav .nav-item:hover ul { display: block; }

书写并添加js代码。

<script src="js/jquery.min.js"></script>

<script>

$(function(){

    $('.nav-item>a').on('click',function(){

        if (!$('.nav').hasClass('nav-mini')) {

            if ($(this).next().css('display') == "none") {

                //展开未展开

                $('.nav-item').children('ul').slideUp(300);

                $(this).next('ul').slideDown(300);

                $(this).parent('li').addClass('nav-show').siblings('li').removeClass('nav-show');

            }else{

                //收缩已展开

                $(this).next('ul').slideUp(300);

                $('.nav-item.nav-show').removeClass('nav-show');

            }

        }

    });

    //nav-mini切换

    $('#mini').on('click',function(){

        if (!$('.nav').hasClass('nav-mini')) {

            $('.nav-item.nav-show').removeClass('nav-show');

            $('.nav-item').children('ul').removeAttr('style');

            $('.nav').addClass('nav-mini');

        }else{

            $('.nav').removeClass('nav-mini');

        }

    });

});

</script>

代码整体结构。

查看效果。