JS如何实现竖屏轮播图

<div class="banner-box">
      <div class="bannerbox">
        <div class="banner">
          <a class="a-img-ban"> <img class="img-ban" src="./img/640 (4).jpg" alt="终于等到你还好我没放弃"
              title="终于等到你还好我没放弃">
          </a>
          <a class="a-img-ban"> <img class="img-ban" src="./img/640 (18).jpg" alt="关注我们"> </a>
          <a class="a-img-ban"> <img class="img-ban" src="./img/640 (19).jpg" alt="在最好的年纪遇到你,才算没有辜负自己"> </a>
          <a class="a-img-ban"> <img class="img-ban" src="./img/640 (5).jpg" alt="终于等到你吧"> </a>
          <a class="a-img-ban"> <img class="img-ban" src="./img/640 (14).jpg" alt="终于等到你吧"> </a>
          <a class="a-img-ban"> <img class="img-ban" src="./img/640 (15).jpg" alt="终于等到你吧"> </a>
          <a class="a-img-ban"> <img class="img-ban" src="./img/640 (16).jpg" alt="终于等到你吧"> </a>
          <a class="a-img-ban"> <img class="img-ban" src="./img/640 (17).jpg" alt="终于等到你吧"> </a>
          <ul>
            <li class="li-img"><img src="./img/640 (4).jpg" alt="终于等到你还好我没放弃"></li>
            <li class="li-img"><img src="./img/640 (18).jpg" alt="关注我们"></li>
            <li class="li-img"><img src="./img/640 (19).jpg" alt="在最好的年纪遇到你,才算没有辜负自己"></li>
            <li class="li-img"><img src="./img/640 (5).jpg" alt="终于等到你吧"></li>
            <li class="li-img"><img src="./img/640 (14).jpg" alt="终于等到你吧"></li>
            <li class="li-img"><img src="./img/640 (15).jpg" alt="终于等到你吧"></li>
            <li class="li-img"><img src="./img/640 (16).jpg" alt="终于等到你吧"></li>
            <li class="li-img"><img src="./img/640 (17).jpg" alt="终于等到你吧"></li>
          </ul>
        </div>
      </div>
    </div>

  * {
        margin: 0;
        padding: 0;
      }
      ul,
      li {
        list-style: none;
      }
      /* 首页轮播图 banner-box*/
      .banner-box {
        width: 100%;
        display: inline-block;
        padding: 10px;
      }
      .bannerbox {
        width: 600px;
        height: 500px;
        margin: 0 auto;
      }
      .banner {
        width: 600px;
        height: 500px;
        float: left;
        position: relative;
      }
      .banner .a-img-ban {
        position: absolute;
        top: 0;
        left: 0;
        display: block;
        z-index: 9;
        width: 555px;
        height: 500px;
        opacity: 0;
        -webkit-transition: opacity .5s linear 0s;
        -moz-transition: opacity .5s linear 0s;
        -ms-transition: opacity .5s linear 0s;
        -o-transition: opacity .5s linear 0s;
        transition: opacity .5s linear 0s
      }
      .banner .a-img-ban .img-ban {
        width: 555px;
        height: 500px;
        position: absolute;
        z-index: 9;
      }
      .banner .img-ban-curr {
        opacity: 1;
        z-index: 10
      }
      .banner ul {
        width: 300px;
        float: right;
      }
      .banner ul li {
        width: 54%;
        padding: 8px;
        background: #eee;
        margin-bottom: 5px;
        height: 90px;
        cursor: pointer;
        -webkit-transition: background-color .3s linear 0s;
        -moz-transition: background-color .3s linear 0s;
        -ms-transition: background-color .3s linear 0s;
        -o-transition: background-color .3s linear 0s;
        transition: background-color .3s linear 0s;
      }
      .banner ul li.curr {
        background: #f0d0a9;
      }
      .banner ul li img {
        width: 80%;
        display: block;
        height: 100%;
      }
ul,
      li {
        list-style: none;
      }
      /* 首页轮播图 banner-box*/
      .banner-box {
        width: 100%;
        display: inline-block;
        padding: 10px;
      }
      .bannerbox {
        width: 1050px;
        height: 440px;
        margin: 0 auto;
      }
      .banner {
        width: 1050px;
        height: 440px;
        float: left;
        position: relative;
      }
      .banner .a-img-ban {
        position: absolute;
        top: 0;
        left: 0;
        display: block;
        z-index: 9;
        width: 555px;
        height: 440px;
        opacity: 0;
        -webkit-transition: opacity .5s linear 0s;
        -moz-transition: opacity .5s linear 0s;
        -ms-transition: opacity .5s linear 0s;
        -o-transition: opacity .5s linear 0s;
        transition: opacity .5s linear 0s
      }
      .banner .a-img-ban .img-ban {
        width: 555px;
        height: 440px;
        position: absolute;
        z-index: 9;
      }
      .banner .img-ban-curr {
        opacity: 1;
        z-index: 10
      }
      .banner ul {
        width: 300px;
        float: right;
      }
      .banner ul li {
        width: 54%;
        padding: 8px;
        background: #eee;
        margin-bottom: 5px;
        height: 90px;
        cursor: pointer;
        -webkit-transition: background-color .3s linear 0s;
        -moz-transition: background-color .3s linear 0s;
        -ms-transition: background-color .3s linear 0s;
        -o-transition: background-color .3s linear 0s;
        transition: background-color .3s linear 0s;
      }
      .banner ul li.curr {
        background: #f0d0a9;
      }
      .banner ul li img {
        width: 100%;
        display: block;
        height: 100%;
      }

  <script>
      $(function() {
        $(".a-img-ban").eq(0).addClass('img-ban-curr');
        $(".li-img").eq(0).addClass('curr');
        var n = 0;
        setInterval(function() {
          if (n >= $('.li-img').length) {
            n = 0;
          }
          $(".a-img-ban").eq(n).addClass('img-ban-curr').siblings('.a-img-ban').removeClass(
            'img-ban-curr');
          $(".li-img").eq(n).addClass('curr').siblings('.li-img').removeClass('curr');
          n++;
        }, 2000)
        $('.li-img').click(function() {
          var num = $(".li-img").index(this);
          $(".a-img-ban").eq(num).addClass('img-ban-curr').siblings('.a-img-ban').removeClass(
            'img-ban-curr');
          $(this).addClass('curr').siblings(".li-img").removeClass('curr');
          n = num;
        });
      });
    </script>