图片首尾平滑轮播(JS原生方法—节流)<原创>

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首先给出HTML代码，要注意轮播图片表(#list)末尾加上第一个图片1.jpg，在首部加上最后一个图片5.jpg。

 <!DOCTYPE html>

 <html lang="en">

 <head>

     <meta charset="UTF-8">

     <title>首尾轮播</title>

     <link rel="stylesheet" href="首尾轮播.css">

 <script src="首尾轮播.js"></script>

 </head>

 <body>

     <div id="container">

         <div id="list" style="left: -500px">

             <div><a href="#"><img src="../imgs/5.jpg" alt=""></a></div>

             <div><a href="#"><img src="../imgs/1.jpg" alt=""></a></div>

             <div><a href="#"><img src="../imgs/2.jpg" alt=""></a></div>

             <div><a href="#"><img src="../imgs/3.jpg" alt=""></a></div>

             <div><a href="#"><img src="../imgs/4.jpg" alt=""></a></div>

             <div><a href="#"><img src="../imgs/5.jpg" alt=""></a></div>

             <div><a href="#"><img src="../imgs/1.jpg" alt=""></a></div>

         </div>

         <div class="arrow" id="prev">&lt;</div>

         <div class="arrow" id="next">&gt;</div>

     </div>        

 </body>    

 </html>

接下来给出css和js代码，大家可以酌情根据图片的大小、数量、宽度，调整container、list的参数，这也是封装JS所要考虑的参数。

 *{

     margin:;

     padding:;

 }

 #container{

     height: 400px;

     width:  500px;

     margin: 0 auto;

     position: relative;

     overflow: hidden;

     border: 1px solid black;

 }

 #list>div {

     float: left;

 }

 #list{

     position: absolute;

     height: 400px;

     width:  3600px;

 }

 #list img{

     height: 400px;

     width:  500px;

 }

 .arrow {

     user-select:none;

     position: absolute;

     top:150px;

     z-index:;

     background-color: #aaa;

     height: 100px;

     width:  80px;

     cursor: pointer;

     opacity: 0.5;

     display: none;

     line-height: 100px;

     text-align: center;

     color: #222;

     font-size: 3em;

 }

 #container:hover .arrow{

     display: block;

 }

  #prev{

     left:20px;

 }

  #next{

     right: 20px;

 }

在JS中，我们可以通过改变speed变量来控制图片切换的速度....这里用的是 element.style.transition来控制的过渡效果.

 window.onload=function(){

     var container = document.getElementById('container');

     var list = document.getElementById('list');//获取图片容器

     var prev = document.getElementById('prev');//向前按钮

     var next = document.getElementById('next');//向后按钮

     var nowP = 1;    //显示位置

     var judge = null;    //执行权

     var speed = 0.1; // 切换速度  秒

     prev.onclick=function(){

         if(!judge){

              judge = setTimeout(function(){

                  if(nowP==1){setTimeout(function(){

                      list.style.transition="left 0s";

                     list.style.left = "-2500px";　

                     nowP = 5;},speed*1000);} //当到达图片表左边缘时与动画同步切换

                  list.style.transition = "left "+speed+"s";

                 move(500);

                 nowP--;

                 judge = null;

             },speed*1000);

         }

     };

     next.onclick=function(){

         if(!judge){

              judge = setTimeout(function(){

                  if(nowP==5){setTimeout(function(){

                      list.style.transition="left 0s";

                     list.style.left = "-500px";

                     nowP = 1;},speed*1000);} //当到达图片表右边缘时与动画同步切换

                 list.style.transition = "left "+speed+"s";

                 move(-500);

                 nowP++;

                 judge = null;

             },speed*1000);

         }

     };

     function move(num){

         var term = parseInt(list.style.left) + num ;

         list.style.left = term+"px";

     }

     var roll= setInterval(function(){

         next.onclick();

     },2000);

     container.onmouseenter=function(){

         clearInterval(roll);

     };

     container.onmouseleave=function()

         {

         roll=setInterval(function(){

         next.onclick();

         },2000);

     };

 };