模仿了首页大部分呈现

html代码

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <link rel="stylesheet" href="font/iconfont.css" />
    <link rel="stylesheet" href="css/common.css" />
    <link rel="stylesheet" href="css/index.css" />
    <script>
      window.onload = function () {
        let itemclassify = document.querySelector(".itemclassify");
        // console.log(itemclassify.innerHTML);
        itemclassify.addEventListener("mouseover", showList);
        itemclassify.addEventListener("mouseout", hideList);
        function showList(ev) {
          if (
            ev.target.nodeName == "SPAN" &&
            ev.target.nextElementSibling.nodeName == "UL"
          ) {
            //判断触发事件的对象是否为A标签的兄弟标签ul
            ev.target.nextElementSibling.style.display = "block";
          }
        }
        function hideList(ev) {
          if (
            ev.target.nodeName == "SPAN" &&
            ev.target.nextElementSibling.nodeName == "UL"
          ) {
            //判断触发事件的对象是否为A标签的兄弟标签ul
            ev.target.nextElementSibling.style.display = "none";
          }
        }
        let leftSideBar = document.querySelector(".leftSideBar");
        let ht = document.documentElement;
        console.log(ht.scrollTop);
        document.body.addEventListener("scroll", showMM);
        window.addEventListener("load", showMM);
        function showMM() {
          console.log(document.body.scrollTop);
          if (document.body.scrollTop >= 400) {
            leftSideBar.style.display = "block";
          } else {
            leftSideBar.style.display = "none";
          }
        }
      };
    </script>
  </head>
  <body>
    <header>
      <div class="flexDis flexJContentSb container flexAlignItemsC">
        <div>
          <span>xx市</span>  
          <span class="iconfont icon-xiala iconS"></span>
        </div>
        <div class="flexDis">
          <div>
            <span>请登入</span>
          </div>
          <div>
            <span>注册</span>
          </div>
          <div>
            <span>签到有礼</span>
          </div>
          <div>
            <span>我的订单</span>
          </div>
          <div>
            <span>我的特卖</span>
            <span class="iconfont icon-xiala iconS"></span>
          </div>
          <div>
            <span>会员俱乐部</span>
            <span class="iconfont icon-xiala iconS"></span>
          </div>
          <div>
            <span>客户服务</span>
            <span class="iconfont icon-xiala iconS"></span>
          </div>
          <div>
            <span class="iconfont icon-shouji"></span>
            <span>手机版</span>
          </div>
          <div>
            <span>更多</span>
            <span class="iconfont icon-xiala iconS"></span>
          </div>
        </div>
      </div>
    </header>
    <section class="sectcon1 flexDis container flexAlignItemsC flexJContentSb">
      <div><img src="pic/vip_logo.jpg" alt="" /></div>
      <div class="flexDis flexJContentSb" style="width: 300px;">
        <a href="#">
          <span class="iconfont icon-anquan"></span>
          <span>100%正品</span>
        </a>
        <a href="#">
          <span class="iconfont icon-smile"></span>
          <span>88元免邮</span>
        </a>
        <a href="#">
          <span class="iconfont icon-tianmaoqitiantuihuo"></span>
          <span>退换无忧</span>
        </a>
      </div>
      <div>
        <div>
          <input type="text" value="" name="search" class="search_input" /><a
            href="#"
            class="search_a"
          >
            <span class="iconfont icon-sousuo iconse"></span
          ></a>
        </div>
        <div
          class="hot-search flexDis flexJContentSb"
          style="color: gray; font-size: 0.8em;"
        >
          <span>连衣裙</span>| <span>护肤套装</span>| <span>耐克nike</span>|
          <span>女士T恤</span>| <span>女士休闲裤</span>|
          <span>手机</span>
        </div>
      </div>
      <div class="spackage">
        <span class="iconfont icon-gouwudai gggwdsize"></span>
        <span>购物袋</span>
        <span class="spackagenum">0</span>
      </div>
    </section>
    <nav class="flexDis container flexJContentSb flexAlignItemsC">
      <div class="itemclassify">
        <span class="iconfont icon-fenlei"></span>
        <span>商品分类</span>
        <ul class="itemclassifyList">
          <li>女装/男装/内衣</li>
          <li>女鞋/男鞋/箱包</li>
          <li>运动户外</li>
          <li>家电数码</li>
          <li>居家用品</li>
          <li>母婴童装</li>
          <li>手表配饰</li>
        </ul>
      </div>
      <div
        class="flexDis flexJContentSb"
        style="width: 800px; font-size: 1.2em;"
      >
        <span>首页</span>
        <span>端午特卖</span>
        <span>最后疯抢</span>
        <span>唯品快抢</span>
        <span>女装</span>
        <span>母婴</span>
        <span>家电</span>
        <span>国际</span>
        <span>美妆</span>
        <span>鞋包</span>
        <span>男装</span>
      </div>
      <div style="font-size: 1.2em;">
        <span>更多</span>
        <span class="iconfont icon-down"></span>
      </div>
    </nav>
    <section class="lunbotu">
      <div class="inner">
        <img src="pic/bac3.jpg" alt="" />
        <img src="pic/bac2.jpg" alt="" />
        <div class="lunboContent flexDis flexJContentSa">
          <span>端午特卖 亿元补贴</span>|
          <span>阿迪达斯VIP大牌日 全场低至2折</span>|
          <span>欧莱雅VIP大牌日 逆时瓶买1享4</span>|
          <span>假期宅家攻略</span>
        </div>
        <div class="before-after flexDis flexJContentSb">
          <span class="iconfont icon-zuo"></span>
          <span class="iconfont icon-xiangyou"></span>
        </div>
      </div>
    </section>
    <div class="rightSideBar">
      <ul class="flexDis flexDirV flexJContentFS">
        <li class="flexDis flexDirV">
          <span class="iconfont icon-sun iconRB"></span>
          <span style="width: 16px;">账号</span>
        </li>
        <li class="flexDis flexDirV">
          <span class="iconfont icon-Handshake iconRB"></span>
          <span style="width: 16px;">购物袋</span>
        </li>
        <li>
          <span class="iconfont icon-smile iconRB"> </span>
        </li>
        <li>
          <span class="iconfont icon-smile iconRB"></span>
        </li>
        <li>
          <span class="iconfont icon-smile iconRB"></span>
        </li>
        <li>
          <span class="iconfont icon-smile iconRB"></span>
        </li>
      </ul>
    </div>
    <div class="leftSideBar">
      <ul class="flexDis  flexDirV">
        <li style="background-color: rgb(241,1,128); border-radius: 2px;">
          精选
        </li>
        <li>
          <span class="iconfont icon-smile"></span>
          <span>女装</span>
        </li>
        <li>
          <span class="iconfont icon-smile"></span>
          <span>鞋包</span>
        </li>
        <li>
          <span class="iconfont icon-smile"></span>
          <span>男装</span>
        </li>
        <li>
          <span class="iconfont icon-smile"></span>
          <span>运动</span>
        </li>
        <li>
          <span class="iconfont icon-smile"></span>
          <span>女装</span>
        </li>
        <li>
          <span class="iconfont icon-smile"></span>
          <span>鞋包</span>
        </li>
        <li>
          <span class="iconfont icon-smile"></span>
          <span>男装</span>
        </li>
        <li>
          <span class="iconfont icon-smile"></span>
          <span>运动</span>
        </li>
        <li>
          <span class="iconfont icon-smile"></span>
          <span>男装</span>
        </li>
        <li>
          <span class="iconfont icon-smile"></span>
          <span>运动</span>
        </li>
      </ul>
    </div>
    <section class="container" style="margin-top: 100px; margin-bottom: 20px;">
      <img src="pic/banner1.jpg" alt="" />
    </section>
    <section class="container" style="width: 100%;">
      <div style="text-align: center; margin: 20px;">
        <img src="pic/banner2.jpg" alt="" />
      </div>
      <div class="flexDis flexJContentC">
        <img src="pic/banner3.jpg" alt="" />
        <img src="pic/banner4.jpg" alt="" />
        <img src="pic/banner5.jpg" alt="" />
      </div>
    </section>
    <footer class="container footerBorder" style="margin-top: 50px;padd">
      <div class="flexDis flexJContentSa">
        <div class="flexDis flexDirV">
          <span class="circle">
            <span class="iconfont icon-anquan circleSize1"></span>
          </span>
          <span style="color: gray; padding: 5px;" >全球领先</span>
        </div>                
        <div class="flexDis flexDirV">
          <span class="circle">
            <span class="iconfont icon-anquan circleSize1"></span>
          </span>
          <span style="color: gray; padding: 5px;" >全球领先</span>
        </div>                
        <div class="flexDis flexDirV">
          <span class="circle">
            <span class="iconfont icon-anquan circleSize1"></span>
          </span>
          <span style="color: gray; padding: 5px;" >全球领先</span>
        </div>                
        <div class="flexDis flexDirV">
          <span class="circle">
            <span class="iconfont icon-anquan circleSize1"></span>
          </span>
          <span style="color: gray; padding: 5px;" >全球领先</span>
        </div>                
        <div class="flexDis flexDirV">
          <span class="circle">
            <span class="iconfont icon-anquan circleSize1"></span>
          </span>
          <span style="color: gray; padding: 5px;" >全球领先</span>
        </div>                
        <div class="flexDis flexDirV">
          <span class="circle">
            <span class="iconfont icon-anquan circleSize1"></span>
          </span>
          <span style="color: gray; padding: 5px;" >全球领先</span>
        </div>                
        <div class="flexDis flexDirV">
          <span class="circle">
            <span class="iconfont icon-anquan circleSize1"></span>
          </span>
          <span style="color: gray; padding: 5px;" >全球领先</span>
        </div>                
        <div class="flexDis flexDirV">
          <span class="circle">
            <span class="iconfont icon-anquan circleSize1"></span>
          </span>
          <span style="color: gray; padding: 5px;" >全球领先</span>
        </div>                
      </div>
      <div class="flexDis flexJContentSe flexAlignItemsC" style="font-size: 10px; margin-top: 20px;">
        <div class="rightBorder">
          <span>服务保障</span>
          <ul>
            <li><a href="">正品保证</a></li>
            <li><a href="">7天无理由放心退</a></li>
            <li><a href="">7x15小时客户服务</a></li>
            <li><a href="">7天无理由随心换</a></li>
            <li><a href=""></a></li>
            <li><a href=""></a></li>
          </ul>
        </div>
        <div class="rightBorder">
          <span>服务保障</span>
          <ul>
            <li><a href="">正品保证</a></li>
            <li><a href="">7天无理由放心退</a></li>
            <li><a href="">7x15小时客户服务</a></li>
            <li><a href="">7天无理由随心换</a></li>
            <li><a href=""></a></li>
            <li><a href=""></a></li>
          </ul>
        </div>
        <div class="rightBorder">
          <span>服务保障</span>
          <ul>
            <li><a href="">正品保证</a></li>
            <li><a href="">7天无理由放心退</a></li>
            <li><a href="">7x15小时客户服务</a></li>
            <li><a href="">7天无理由随心换</a></li>
            <li><a href=""></a></li>
            <li><a href=""></a></li>
          </ul>
        </div>
        <div class="rightBorder"> 
          <span>服务保障</span>
          <ul>
            <li><a href="">正品保证</a></li>
            <li><a href="">7天无理由放心退</a></li>
            <li><a href="">7x15小时客户服务</a></li>
            <li><a href="">7天无理由随心换</a></li>
            <li><a href=""></a></li>
            <li><a href=""></a></li>
          </ul>
        </div>
        <div class="rightBorder">
          <span>服务保障</span>
          <ul>
            <li><a href="">正品保证</a></li>
            <li><a href="">7天无理由放心退</a></li>
            <li><a href="">7x15小时客户服务</a></li>
            <li><a href="">7天无理由随心换</a></li>
            <li><a href=""></a></li>
            <li><a href=""></a></li>
          </ul>
        </div>
        <div class="flexDis flexDirV flexAlignItemsC">
          <span>唯品会APP二维码</span>
          <img src="pic/二维码.JPG" alt="">
          <span>下载唯品会移动APP</span>
        </div>
      </div>
      <div > 
        <div  class="flexDis flexJContentC about" >
          <span>关于我们</span>|
          <span>About Us</span>|
          <span>Investor Relations</span>|
          <span>媒体报道</span>|
          <span>品牌招商</span>|
          <span>隐私条款</span>|
          <span>唯品诚聘</span>|
          <span>唯品卡</span>|
          <span>联系我们</span>
        </div >
        <div class="relativeItem">
<p>Copyright © 2008-2020 vip.com，All Rights Reserved  使用本网站即表示接受 唯品会用户协议。版权所有 广州唯品会电子商务有限公司</p>
<p>粤公网安备 44010302111111号    粤ICP备08114786号 增值业务经营许可证：粤B2-20170777 网络文化经营许可证：粤网文〔2018〕5030-1743号</p>
<p>经营主体证照   风险监测信息   互联网药品信息服务资格证书：（粤）-经营性-2018-0271 网络食品交易第三方平台备案凭证：粤B2-20170777 医疗器械网络交易服务第三方平台备案</p>
<p>凭证：（粤）网械平台备字[2019]第00001号</p>
        </div>
      </div>
    </footer>
  </body>
</html>

CSS代码（首页部分）

header > div > div:nth-child(2) > div {
  /* border: 1px solid green; */
  padding: 0 10px;
}
/* 设置头部背景和字体 */
header {
  height: 30px;
  background-color: lightgray;
}
header > div {
  /* background-color: lightgray; */
  height: 100%;
}
/* 设置搜索框的边框颜色，以及其后图标的背景色 */
.search_input {
  /* background-color: tomato; */
  border: 1px solid tomato;
  /* display: inline-block; */
  height: 45px;
  width: 400px;
  margin: 0;
  font-size: 25px;
}
.search_a {
  display: inline-block;
  border: rgb(241,1,128);
  color: white;
  background-color:rgb(241,1,128);
  height: 45px;
  width: 50px;
  text-align: center;
  vertical-align: top;
  margin: 0;
}
.iconse {
  line-height: 45px;
  font-size: 25px;
}
/* 设置搜索区域 */
.sectcon1 {
  height: 150px;
  /* border: 1px solid red; */
}
/* 设置购物袋 */
.spackage {
  /* margin-left: -100px; */
  border: 1px solid lightgray;
  height: 45px;
  line-height: 40px;
  width: 120px;
  text-align: center;
  border-radius: 5px;
  background-color: lightsteelblue;
  margin-bottom: 20px;
}
.gggwdsize {
  font-size: 25px; */
}
.spackagenum{
    display: inline-block;
    background-color:rgb(241,1,128);
    height: 20px;
    width: 30px;
    border-radius: 5px;
    color: white;
    vertical-align: text-bottom;
    font-size: 20px;
    line-height: 20px;
}
/* 商品分类样式设置 */
.itemclassify{
    background-color: rgb(241,1,128);
    padding: 10px 30px;
    color: white;
    font-size: large;
    position: relative;
}
/* 商品分类下拉列表 */
.itemclassifyList{
  position: absolute;
  top: 40px;
  left: 0;
  z-index: 1;
  display: none;
  ;
  width: 100%;
  background-color: rgb(241,1,128);
  /* display: none; */
}
.itemclassifyList >li{
  text-align: center;
  height: 50px;
  font-size: 15px;
  line-height: 50px;
}
/* 轮播途背景设置 */
.lunbotu{
    background-image: url("pic/bac1.jpg");
    height: 400px;
    width: 100%;
    border: 1px solid white;
    margin: 20px;
    background-color: lightblue;
    background-repeat: no-repeat;
    background-size: cover;
}
/* 轮播图内框设置 ，开启相对定位*/
.inner{
    height: 100%;
    width: 75%;
    background-color: white;
    border-top: 1px solid white;
    background-origin: border-box;
    margin-left:  auto ;
    margin-right: auto;
    margin-top: 35px;
    box-shadow: 0 3px 5px rgba(0,0,0,0.2);
    position:relative
    }
/* 轮播图片设置，开启绝对定位 */
  .inner > img{
    display: block;
    width: 95%;
    height: 88%;
    position: absolute;
    left: 2.5%;
    top: 4%;
  }
  /* 设置轮播图下方的文字 */
  .lunboContent{
    width: 100%;
    position: absolute;
    right: 0;
    bottom: 0;
  }
  .lunboContent > span:nth-child(1){
    border-bottom: rgb(241,1,128) solid 3px;
  }
  .lunboContent > span:hover{
    border-bottom: rgb(241,1,128) solid 3px;
  }
/* 设置轮播图片按钮 */
  .before-after{
    position: absolute;
    top: 40%;
    width: 95%;
    left: 2.5%;
  }
  .before-after  > span{
    font-size: 20px;
    line-height: 50px;
    color: lightgrey;
    height: 50px;
    width: 50px;
    background-color: rgba(17, 15, 15, 0.349);
    text-align: center;
    transition: width 2s;
  }
  .before-after  > span:nth-child(1){
    font-weight: bold;
  }
  .before-after  > span:hover{
    color: white;
    width: 100px;
  }
/* 左侧边栏设置 */
  .leftSideBar{
    display: none;
    position: fixed;
    left: 5px;
    top:200px;
    border: 1px solid lightgray;
    border-radius: 2px;
    box-shadow: 0 5px 5px rgba(0,0,0,0.2);
  }
  .leftSideBar > ul > li{
    text-align: center;
    padding: 5px;border-bottom: 1px solid rgb(161, 159, 159);
    margin: 10px;
    color: gray;
    font-size: 13px;
  }
/* 右侧边栏设置 */
  .rightSideBar{
    position: fixed;
    height: 100%;
    width: 40px;
    /* border: 1px solid red; */
    /* z-index: 1; */
    right: 17px;
    top: 0px;
  }
/* 设置高度为窗口高度 */
  .rightSideBar > ul{
    height: 100%;
  }
/*  */
  .rightSideBar > ul > li{
      /* border: 1px solid red; */
  }
  .rightSideBar > ul > li:nth-child(2){
    height: 25%;
    background-color:red;
    color: white;
    font-size: 25px;
  }
  .rightSideBar > ul > li:nth-child(1){
    height: 20%;
    background-color:black;
    color: white;
    font-size: 25px;
  }
  .rightSideBar > ul > li:nth-child(n+3) {
    height: 15%;
  }
  .rightSideBar > ul > li:nth-child(n+3) > span{
    display: block;
    height: 100%;
    line-height: 100%;
    color: white;
    background-color: black;
    text-align: center;
  }
/* 设置字体图标 */
.iconRB{
  font-size: 25px;
}
/* 页脚设置 */
.circle{
  display: inline-block;
  height: 70px;
  text-align: center;
  border-radius: 50%;
  width: 70px;
  border: rgba(17, 15, 15, 0.349) 1px solid;
}
/* 字体图标外框圆形设置 */
.circleSize1{
  font-size: 40px;
  color: gray;
  line-height: 70px;
}
.rightBorder{
  padding-right: 40px;
  border-right: 1px solid black;
  padding-left: 0px;
}
/* 页脚边框设置 */
.footerBorder{
  /* border: 1px solid red; */
  box-shadow: 0 5px 5px rgba(17, 15, 15, 0.349);
}
.about{
  font-size: 13px;
  margin: 5px auto;
  background-color: rgb(241,1,128);
  color:white;
}
.about >span{
  padding: 2px 5px;
}
.relativeItem{
  padding: 20px;
}
.relativeItem >p{
  margin: 0 auto;
  color: gray;
  font-size: 13px;
}

css代码（公共部分）

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  list-style: none;
}
/* 页面宽高设为浏览器窗口的100%，垂直方向滚动 */
html,
body {
  width: 100%;
  height: 100%;
  overflow-x: hidden;
  font-size: 16px;
}
/* 通用容器宽度 */
.container {
  width: 1200px;
  margin: 0 auto;
  /* border: 1px solid red; */
}
/* 清除a标签下划线 */
a {
  color: lightslategrey;
  text-decoration: none;
}
/* 清除button,img的边框和外轮廓线 */
button,
img {
  border: none;
  outline: none;
}
/* 启动弹性盒子 */
.flexDis {
  display: flex;
}
/* 主轴在垂直方向 */
.flexDirV {
  flex-direction: column;
}
.flexJContentFS {
  justify-content: flex-start;
}
.flexJContentC {
  justify-content: center;
}
/* 弹性盒子主轴剩余空间 */
.flexJContentSb {
  justify-content: space-between;
}
.flexJContentSe {
  justify-content: space-evenly;
}
.flexJContentSa {
  justify-content: space-around;
}
/* 弹性盒子辅助轴对齐方式 */
.flexAlignItemsC {
  align-items: center;
}
/* 调整字体图标的颜色和大小 */
.iconS {
  color: grey;
  font-size: 10px;
}