基于javascript实现移动端轮播图效果

<!-- 结构 -->
 <!-- li*6>a[href=#]>img[src=./images/$.jpg] -->
 <div class="box">
  <ul>
   <!-- 为了无缝连接，我们在图片这里前后增加了2个图片 -->
   <li>
    <a href="#" ><img src="./images/6.jpg" alt=""></a>
   </li>
   <li>
    <a href="#" ><img src="./images/1.jpg" alt=""></a>
   </li>
   <li>
    <a href="#" ><img src="./images/2.jpg" alt=""></a>
   </li>
   <li>
    <a href="#" ><img src="./images/3.jpg" alt=""></a>
   </li>
   <li>
    <a href="#" ><img src="./images/4.jpg" alt=""></a>
   </li>
   <li>
    <a href="#" ><img src="./images/5.jpg" alt=""></a>
   </li>
   <li>
    <a href="#" ><img src="./images/6.jpg" alt=""></a>
   </li>
   <li>
    <a href="#" ><img src="./images/1.jpg" alt=""></a>
   </li>
  </ul>
</div>

 * {
   margin: 0;
   padding: 0;
  }
  
  ul {
   list-style: none;
  }
  
  .box {
   width: 100%;
   overflow: hidden;
  }
  
  ul {
   /* 把li变成8张之后，需要，把ul的宽度变宽 */
   width: 800%;
   /* transition: all 1s; */
  }
  
  li {
   float: left;
   width: 12.5%;
  }
  
  img {
   width: 100%;
  }

//获取DOM
 var box = $(".box");
 var img = $("ul img");
 var ul = $("ul");
 var imgWidth = img.width();

 var index = 1;
 var right = index * imgWidth;
 ul.css("transform", `translateX(-${right}px)`);
 setTimeout(function() {
  ul.css("transition", "all 500ms");
 }, 100);

 //往左滑，坐标在增大
 box.on("swipeLeft", function() {
  index++;
  // if (index == img.length) {
  //  index = 0;
  // }
  var left = index * imgWidth;
  ul.css("transform", `translateX(-${left}px)`);
 });
 //往左滑，坐标在增大
 box.on("swipeRight", function() {
  index--;
  // if (index == -1) {
  //  index = img.length - 1;
  // }
  var right = index * imgWidth;
  ul.css("transform", `translateX(-${right}px)`);
 });

 //过渡结束之后时进行
 ul.on("transitionend", function() {
  //1.判读 index
  //往左面滑(滑倒倒数第一张的时候，其实显示的已经是用户想看的第一张)
  if (index == img.length - 1) {

   index = 1;
   //index修改完毕之后需要重新执行一遍
   var right = index * imgWidth;
   ul.css("transform", `translateX(-${right}px)`);

   //2.取消过渡效果
   ul.css("transition", "none");
   //3.已经判断完毕了，重新打开过渡效果
   //这里设置一个1毫秒的延迟，否则会一起进行
   setTimeout(function() {
    ul.css("transition", "all 500ms");
   }, 1);
  }

  //1.判读 index
  //往右面滑(滑倒index为0的时候，显示的是客户想看的第6张图)
  if (index == 0) {
   //2.取消过渡效果
   ul.css("transition", "none");
   index = img.length - 2;
   //index修改完毕之后需要重新执行一遍
   var left = index * imgWidth;
   ul.css("transform", `translateX(-${left}px)`);
   //延迟开启过渡效果
   setTimeout(function() {
    ul.css("transition", "all 500ms");
   }, 1)
  }
 })