JS仿京东移动端手指拨动切换轮播图效果

  <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);
 })
}