CSS如何实现底部tapbar栏功能

现在许多移动手机端都有底部tab栏切换的功能，最近恰巧也做到类似的功能，废话不多说，直接上代码。

先看效果图

css样式

*{
           margin: 0;
           padding: 0;
           text-decoration: none;
           list-style: none;

       }
       .foot {
           width: 100%;
           height: 68px;
           background: #FFFFFF;
           position: fixed;
           bottom: 0;
           display: flex;
           justify-content: space-around;
           z-index: 999;
           /*line-height: 20px;*/
       }

       .foot li {
           height: 100%;
       }

       .foot li a {
           display: block;
           width: 100%;
           height: 100%;
           /* color: #979797;*/
       }

       .foot li a img {
           /*display: block;*/
           width: 26px;
           height: 26px;
           margin-top: 10px;
       }

       .foot li a p {
           font-size: 12px;
           width: 100%;
           text-align: center;
           /* color: #979797;*/
           margin-top: 7px;
       }
       .botm-title{
           color: #979797;
       }

       .actives {
           color: #5C91FA;
       }
       .xz-img{
           text-align: center;
       }

页面代码

<%--底部tapbar--%>
   <ul class="foot">
       <li class="Imgbox" img="/images/tuiJianCus/index-wxz-icon.png" data-img="/images/tuiJianCus/index-xz-icon.png">
           <a rel="nofollow noopener noreferrer" href="/views/tuiJianCus/index.jsp">
               <div class="xz-img">
                   <img src="/images/tuiJianCus/index-wxz-icon.png" />
               </div>

               <p class="botm-title">首页推荐</p>
           </a>
       </li>
       <li class="Imgbox" img="/images/tuiJianCus/tuijiang-wxz-icon.png" data-img="/images/tuiJianCus/tuijiang-xz-icon.png">
           <a rel="nofollow noopener noreferrer" href="/views/tuiJianCus/tuijian_speed.jsp">
               <div class="xz-img">
                   <img src="/images/tuiJianCus/tuijiang-xz-icon.png" />
               </div>

               <p class="botm-title actives ">我的推荐</p>
           </a>
       </li>
       <li class="Imgbox" img="/images/tuiJianCus/my-wxz-icon.png" data-img="/images/tuiJianCus/my-xz-icon.png">
           <a rel="nofollow noopener noreferrer" href="/views/tuiJianCus/usercenter.jsp">
               <div class="xz-img">
                   <img src="/images/tuiJianCus/my-wxz-icon.png" />
               </div>

               <p class="botm-title ">我的福利</p>
           </a>
       </li>
   </ul>

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