<ul class='banner_imgs clearfix'>
     <li class='f_l'>
      <a href="#"><img src="image/l8.jpg" alt="" /></a>
     </li>
     <li class='f_l'>
      <a href="#"><img src="image/l1.jpg" alt="" /></a>
     </li>
     <li class='f_l'>
      <a href="#"><img src="image/l2.jpg" alt="" /></a>
     </li>
     <li class='f_l'>
      <a href="#"><img src="image/l3.jpg" alt="" /></a>
     </li>
     <li class='f_l'>
      <a href="#"><img src="image/l4.jpg" alt="" /></a>
     </li>
     <li class='f_l'>
      <a href="#"><img src="image/l5.jpg" alt="" /></a>
     </li>
     <li class='f_l'>
      <a href="#"><img src="image/l6.jpg" alt="" /></a>
     </li>
     <li class='f_l'>
      <a href="#"><img src="image/l7.jpg" alt="" /></a>
     </li>
     <li class='f_l'>
      <a href="#"><img src="image/l8.jpg" alt="" /></a>
     </li>
     <li class='f_l'>
      <a href="#"><img src="image/l1.jpg" alt="" /></a>
     </li>
    </ul>
    <!-- 轮播图的 索引 -->
    <ul class="banner_index clearfix">
     <li class="current"></li>
     <li></li>
     <li></li>
     <li></li>
     <li></li>
     <li></li>
     <li></li>
     <li></li>
    </ul>

.jd_banner .banner_imgs {
 /* 10倍屏幕宽度 */
 width: 1000%;
}
.jd_banner .banner_imgs li {
 /* 一倍的屏幕宽度 */
 width: 10%;
}
.jd_banner .banner_imgs li a {
 display: block;
 width: 100%;
}
.jd_banner .banner_imgs li a img {
 display: block;
 width: 100%;
}
.jd_banner .banner_index {
 position: absolute;
 bottom: 15px;
 left: 50%;
 margin-left: -64px;
}
.jd_banner .banner_index li {
 float: left;
 width: 6px;
 height: 6px;
 border: 1px solid white;
 border-radius: 50%;
 margin: 0 5px;
}
.jd_banner .banner_index li.current {
 background-color: #fff;
}

window.onload = function() {
 slide();
}

function slide() {
 var bannerImgs = document.querySelector(".banner_imgs");
 var Indexs = document.querySelectorAll(".banner_index li");
 var imgLis = document.querySelectorAll(".banner_imgs li");

 //屏幕宽度
 var screenWidth = document.body.offsetWidth;
 var index = 1;

 //默认显示的应该是第二张图片
 bannerImgs.style.transform = "translateX(" + screenWidth * index * -1 + "px)";

 //添加过渡效果
 function setTransition() {
  bannerImgs.style.webkitTransition = "all .2s";
  bannerImgs.style.transition = "all .2s";
 }

 //清除过渡效果
 function clearTransition() {
  bannerImgs.style.webkitTransition = "none";
  bannerImgs.style.transition = "none";
 }

 //设置移动距离
 function setTranslateX(distance) {
  bannerImgs.style.webkitTransform = "translateX(" + distance + "px)";
  bannerImgs.style.transform = "translateX(" + distance + "px)";
 }

 //控制小圆点
 function setPoint() {
  for (var i = 0; i < Indexs.length; i++) {
   Indexs[i].className = "";
  }
  Indexs[index - 1].className = "current";
 }

 //设置定时器
 var timer = setInterval(function() {
  index++;
  setTransition();
  setTranslateX(screenWidth * index * -1);
 }, 1000);

 //添加过渡动画结束事件
 bannerImgs.addEventListener("transitionend", function() {
  if (index > 8) {
   index = 1;
  } else if (index < 1) {
   index = 8;
  }
  clearTransition();
  setTranslateX(screenWidth * index * -1);
  setPoint();
 })


 //添加touch事件
 var startX = 0;
 var moveX = 0;
 var isMove = false;

 bannerImgs.addEventListener("touchstart", function(event) {
  isMove = false;
  clearInterval(timer);
  startX = event.touches[0].clientX;
 })

 bannerImgs.addEventListener("touchmove", function(event) {
  isMove = true;
  moveX = event.touches[0].clientX - startX;
  setTranslateX(moveX + index * screenWidth * -1);
 })

 bannerImgs.addEventListener("touchend", function(event) {
  if(isMove && Math.abs(moveX) > screenWidth/3){
   if (moveX < 0) {
    index++;
   } else if (moveX > 0) {
    index--;
   }
  }
  setTransition();
  setTranslateX(index * screenWidth * -1);
  timer = setInterval(function() {
   index++;
   setTransition();
   setTranslateX(screenWidth * index * -1);
  }, 1000);
 })
}