HTML

<div class="tab">
    <div class="tab-nav">
      <h3>每日特价</h3>
      <ul>
        <li><a class="active" href="javascript:;">精选</a></li>
        <li><a href="javascript:;">美食</a></li>
        <li><a href="javascript:;">百货</a></li>
        <li><a href="javascript:;">个护</a></li>
        <li><a href="javascript:;">预告</a></li>
      </ul>
    </div>
    <div class="tab-content">
      <div class="item active"><img src="./images/tab00.png" alt="" /></div>
      <div class="item"><img src="./images/tab01.png" alt="" /></div>
      <div class="item"><img src="./images/tab02.png" alt="" /></div>
      <div class="item"><img src="./images/tab03.png" alt="" /></div>
      <div class="item"><img src="./images/tab04.png" alt="" /></div>
    </div>
  </div>

CSS

 * {
      margin: 0;
      padding: 0;
    }

    .tab {
      width: 590px;
      height: 340px;
      margin: 20px;
      border: 1px solid #e4e4e4;
    }

    .tab-nav {
      width: 100%;
      height: 60px;
      line-height: 60px;
      display: flex;
      justify-content: space-between;
    }

    .tab-nav h3 {
      font-size: 24px;
      font-weight: normal;
      margin-left: 20px;
    }

    .tab-nav ul {
      list-style: none;
      display: flex;
      justify-content: flex-end;
    }

    .tab-nav ul li {
      margin: 0 20px;
      font-size: 14px;
    }

    .tab-nav ul li a {
      text-decoration: none;
      border-bottom: 2px solid transparent;
      color: #333;
    }

    .tab-nav ul li a.active {
      border-color: #e1251b;
      color: #e1251b;
    }

    .tab-content {
      padding: 0 16px;
    }

    .tab-content .item {
      display: none;
    }

    .tab-content .item.active {
      display: block;
    }

JS

//获取所有的链接并利用循环绑定事件
const as = document.querySelectorAll('.tab-nav a')
  for(let i = 0;i< as.length;i++){
    as[i].addEventListener('mouseenter',function(){
    //把有active类的给他去掉
      document.querySelector('.tab-nav .active').classList.remove('active')
    //给自己加上active
      this.classList.add('active')

      document.querySelector('.tab-content .active').classList.remove('active')
      document.querySelector(`.tab-content .item:nth-child(${i + 1})`).classList.add('active')
    })
  }