Javascript

js实现移动端轮播图

本文主要是介绍js实现移动端轮播图,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!

本文实例为大家分享了js实现移动端轮播图的具体代码,供大家参考,具体内容如下

这是结构

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, user-scalable=no initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <link rel="stylesheet" href="./css/jd_phnoe.css" rel="external nofollow" >
  <link rel="stylesheet" href="./css/base.css" rel="external nofollow" >
  <title>Document</title>
 
  <script src="./js/jd_phnoe.js"></script>
</head>
<body>
    <div class="jd_layout">
    <div class="jd_banner">
        <ul class="jd_bannerimg clearfix">
         <li>
          <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > <img src="./uploads/l1.jpg" alt="" /> </a>
         </li>
         <li>
          <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > <img src="./uploads/l2.jpg" alt="" /> </a>
         </li>
         <li>
          <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > <img src="./uploads/l3.jpg" alt="" /> </a>
         </li>
         <li>
          <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > <img src="./uploads/l4.jpg" alt="" /> </a>
         </li>
         <li>
          <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > <img src="./uploads/l5.jpg" alt="" /> </a>
         </li>
         <li>
          <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > <img src="./uploads/l6.jpg" alt="" /> </a>
         </li>
         <li>
          <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > <img src="./uploads/l7.jpg" alt="" /> </a>
         </li>
         <li>
          <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > <img src="./uploads/l8.jpg" alt="" /> </a>
         </li>
        </ul>
        <!-- 点标记 -->
        <ul class="jd_bannerIndicator clearfix">
         <li></li>
         <li class="active"></li>
         <li></li>
         <li></li>
         <li></li>
         <li></li>
         <li></li>
         <li></li>
        </ul>
       </div>
    </div>
</body>
</html>

这是CSS

/* 搜索部分 */
.jd_layout{
  width: 100%;
  max-width: 640px;
  min-width: 320px;
  height: auto;
  margin: 0px auto;
  background-color: #ccc;
}

/* 轮播图部分 */
.jd_banner{
  width: 100%;
  overflow: hidden;
  position: relative;
}
.jd_bannerimg{
  width: 1000%;
  position: relative;
}
.jd_bannerimg > li{
  width: 10%;
  float: left; 
}
.jd_bannerimg>li img{
  width: 100%;
  /*1.设置为块元素
  2.可以将文本的字体大小设置为0
  3.vertical-align:bottom*/
  display: block;
}
/* 点标记 */
.jd_bannerIndicator{
  position: absolute;
  left: 50%;
  bottom: 5px;
  transform: translateX(-50%);
}
.jd_bannerIndicator li{
  width: 6px;
  height: 6px;
  float: left;
  border: 1px solid #fff;
  border-radius: 50%;
  /* opacity: 0.7; */
  margin: 0 3px;
  /* cursor: pointer; */
}
.jd_bannerIndicator li:first-of-type{
  margin-left: 0px;
}
.jd_bannerIndicator >li.active{
  background-color: #fff;
}

dase

/*公共样式*/

/*1.样式重置*/
html,body,ul,li,img,a,p,div,form,input,h3{
  padding: 0;
  margin: 0;
  /*设置盒模型*/
  box-sizing: border-box;
  /*去除移动端特有的点击高亮效果*/
  -webkit-tap-highlight-color: transparent;
}
body{
  font-family: "微软雅黑",sans-serif;
  font-size: 13px;
}
a,
a:hover{
  color: #666;
  text-decoration: none;
}
ul{
  list-style: none;
}
input{
  /*1.清除文本框获取焦点时默认的边框阴影*/
  outline: none;
  /*2.去除边框*/
  border: none;
  /*3.添加边框*/
  border: 1px solid #ccc;
}

/*2.添加新的样式*/
.f_left{
  float: left;
}
.f_right{
  float: right;
}
.m_left10{
  margin-left: 10px;
}
.m_right10{
  margin-right: 10px;
}
.m_top10{
  margin-top: 10px;
}
.clearfix::before,
.clearfix::after{
  content: "";
  display: block;
  height: 0;
  line-height: 0px;
  clear: both;
  visibility: hidden;
}

js

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

//轮播图
function banner(){
   /*1.设置修改轮播图的页面结构
  * a.在开始位置添加原始的最后一张图片
  * b.在结束位置添加原始的第一张图片*/
  /*1.1.获取轮播图结构*/
  var banner=document.querySelector(".jd_banner");
  /*1.2.获取图片容器*/
  var imgBox=banner.querySelector("ul:first-of-type");
  //1.3 获取第一张图片
  var first=imgBox.querySelector("li:first-of-type");
  //1.4获取最后一张图
  var last=imgBox.querySelector("li:last-of-type");
  // console.log(first);
  // console.log(last);
  //克隆添加图片
   /*1.5.在首尾插入两张图片  cloneNode:复制一个dom元素*/
  imgBox.appendChild(first.cloneNode(true));
  /*1.6insertBefore(需要插入的dom元素,位置)*/
  imgBox.insertBefore(last.cloneNode(true),imgBox.firstChild);
  //获取对应的样式
  //2.1获取li的位置
  var lis=imgBox.querySelectorAll("li");
  /*2.2 获取li元素的数量*/
  var count=lis.length;
  /*2.3.获取banner的宽度*/
  var bannerWidth=banner.offsetWidth;
  /*2.4 设置图片盒子的宽度*/
  imgBox.style.width=count*bannerWidth+"px";
  /*2.5 设置每一个li(图片)元素的宽度*/
  for(var i=0; i < lis.length;i++){
    lis[i].style.width=bannerWidth+"px";
  }
  /*定义图片索引:图片已经有一个宽度的默认偏移*/
  var index=1;
  /*3.设置默认的偏移*/
  imgBox.style.left=-bannerWidth+"px";
   /*4.当屏幕变化的时候,重新计算宽度*/
   window.onresize=function(){
     bannerWidth=banner.offsetWidth+"px";
     imgBox.style.width=count*bannerWidth+"px";
     for(var i = 0; i < lis.length;i++){
       lis[i].style.width=bannerWidth+"px";
     }
     imgBox.style.left=-index*bannerWidth+"px";
   }
   //自动轮播
   var timerId;
   var strtime=function(){
     timerId=setInterval(function(){
      index++;
      //添加过度效果
      imgBox.style.transition="left 0.5s ease-in-out"
      //设置偏移量
      imgBox.style.left=(-index*bannerWidth)+"px";
      setTimeout(function(){
        //当走到最后一张时候,我就让他等于最后一张
        if(index==count-1){
          index=1;
          // 清除过度效果
          imgBox.style.transition="none";
          /*偏移到指定的位置*/
           imgBox.style.left=(-index*bannerWidth)+"px";
        }
      },500)
     },1500)
   }
   //自动播放调用
   strtime();
   //实现手动轮播
   var startX,moveX,distanceX;
   /*为图片添加触摸事件--触摸开始*/ 
   var isEnd = true; 
   imgBox.addEventListener("touchstart",function(e){
     //停止定时器
    clearInterval(timerId);
    //console.log(e);
    startX=e.targetTouches[0].clientX;  
   });
   //为图片添加触摸过程,滑动图片
   imgBox.addEventListener("touchmove",function(e){
   if(isEnd==true){
       //console.log(123);
     
     /*记录手指在滑动过程中的位置*/
    moveX=e.targetTouches[0].clientX;
    /*计算坐标的差异*/
    distanceX=moveX-startX;
    //清除过度效果
    imgBox.style.transition="none";
    //基于之前轮播图偏移的位置
    imgBox.style.left=(-index*bannerWidth + distanceX)+"px";
   }
   })
   /*添加触摸结束事件*/
   imgBox.addEventListener("touchend",function(e){
     //获取滑动距离,判断是否超过100px
     isEnd=false;
     if(Math.abs(distanceX) > 50){
       //判断滑动方向
       if(distanceX > 0){//上一张
        index--;
       }else{//下一张
         index++;
       }
       //过度效果
       imgBox.style.transition="left 0.5s ease-in-out";
       //偏移位置
       imgBox.style.left=-index*bannerWidth+"px";
     }else if(Math.abs(distanceX) > 0){//回弹效果
       //过度效果
       imgBox.style.transition="left 0.5s ease-in-out";
       //偏移位置
       imgBox.style.left=-index*bannerWidth+"px";
     }
      /*将上一次move所产生的数据重置为0*/
    startX=0;
    moveX=0;
    distanceX=0;
    
   });
   /*webkitTransitionEnd:可以监听当前元素的过渡效果执行完毕,当一个元素的过渡效果执行完毕的时候,会触发这个事件*/
   imgBox.addEventListener("webkitTransitionEnd",function(){
     console.log(index,33333);
     
    /*如果到了最后一张(count-1),回到索引1*/
    /*如果到了第一张(0),回到索引count-2*/
    if(index==count-1){
      index=1;
      imgBox.style.transition="none";
      imgBox.style.left=-index*bannerWidth+"px";
    }else if(index==0){
      index=count-2;
      imgBox.style.transition="none";
      imgBox.style.left=-index*bannerWidth+"px";
    }
    yuandian(index);
    setTimeout(function () {
      isEnd=true;
      clearInterval(timerId);
      strtime();
     },100)
   });

  // //圆点排他
  var yuandian=function (index) {
    //先找到所有的li 进行遍历移除所有样式,为自己加上样式
    var lis=banner.querySelector("ul:last-of-type").querySelectorAll("li");
    for(var i = 0; i < lis.length; i++){
      lis[i].classList.remove("active");
    }
    lis[index-1].classList.add("active");
   }
   

}

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