JavaScript实现多张图片无缝左右滚动原理与代码

JavaScript实现代码

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <meta http-equiv="X-UA-Compatible" content="ie=edge">
 <title>Document</title>
 <style media="screen">
  *{
   padding: 0;
   margin: 0;
  }
  ul,li {
   list-style: none;
  }
  img {
   vertical-align: top;
  }
  #box{
   width: 400px;
   height: 100px;
   margin: 100px auto;
   background-color: pink;
   position: relative;
   overflow: hidden;
  }
  #box ul {
   width: 2000px;
   position: absolute;
   left: 0;
   top: 0;
  }
  #box li {
   float: left;
  }
  .aa {
   width: 200px;
   height: 100px;
  }
  .li-1{
   background-color: #f6e659;
  }
  .li-2{
   background-color: #57fa4f;
  }
  .li-3{
   background-color: #3a8ef1;
  }
  .li-4{
   background-color: #c057f1;
  }
 </style>
</head>
<body>
 <div id="box">
  <ul>
   <li class="li-1 aa">li-1</li>
   <li class="li-2 aa">li-2</li>
   <li class="li-3 aa">li-3</li>
   <li class="li-4 aa">li-4</li>
   <li class="li-1 aa">li-5</li>
   <li class="li-2 aa">li-6</li>
  </ul>
 </div>
</body>
</html>
<script type="text/javascript">
 var box = document.getElementById("box");
 var ul = box.children[0];
 var num = 0;
 timer = setInterval(fn,10);
 function fn() {
  num--;
  num <= -800 ? num = 0 : num;
  ul.style.left = num + "px";
 }
</script>