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JS无缝滚动

时间：2021-07-01 10:21:17 帮助过：13人阅读

<!DOCTYPE html>
<html>
 
 <head>
  <meta charset="UTF-8">
  <title></title>
  <style type="text/css">
   ul,
   li {
    margin: 0;
    padding: 0;
    list-style-type: none;
   }
 
   img {
    height: 300px;
    width: 300px;
   }
 
   ul {
    position: absolute;
    left: 0;
    top: 0;
   }
 
   li {
    float: left;
   }
 
   #div1 {
    height: 300px;
    width: 1200px;
    background-color: red;
    margin: 100px auto;
    position: relative;
    overflow: hidden;
   }
   input{
    border: 1px solid #8A2BE2;
    height: 100px;
    width: 200px;
    font-size: 20px;
    color: white;
    background-color: #FFB6C1;
    margin-left: 100px;
   }
  </style>
 </head>
 
 <body>
  <div id="div1">
   <ul>
    <li><img src="img/014.jpg" /></li>
    <li><img src="img/017.jpg" /></li>
    <li><img src="img/018.jpg" /></li>
    <li><img src="img/019.jpg" /></li>
   </ul>
  </div>
  <input type="button" value="向左滚动" />
  <input type="button" value="向右滚动" />
 </body>
 <script type="text/javascript">
 // 实现无缝滚动，鼠标移入停止滚动，移出继续滚动，以及可以调节滚动方向效果
  var oDiv = document.getElementById("div1");
  var ul = document.getElementsByTagName("ul")[0];
  var liS = document.getElementsByTagName("li");
 
  var timer = null;
  var speed = 4;
  ul.innerHTML = ul.innerHTML + ul.innerHTML;
  ul.style.width = liS[0].offsetWidth * liS.length + "px";
 
  timer = setInterval(move, 30);
 
  oDiv.onmouseover = function() {//实现鼠标移入暂停
   clearInterval(timer);
  }
  oDiv.onmouseout = function() {//鼠标移出继续滚动
   timer = setInterval(move, 30);
 
  }
 
  move();//每次执行move()的时候都会延迟30ms，//
/在第一次的实际效果上有瑕疵，在外面调用一次move()
 
  function move() {
   if(-ul.offsetLeft > ul.offsetWidth / 2) {//左滚无缝
    ul.style.left = 0 + "px";
   }
 
   if(ul.offsetLeft > 0) {//右滚无缝
    ul.style.left = -ul.offsetWidth / 2 + "px";
   }
 
   ul.style.left = ul.offsetLeft + speed + "px";
  }

//实现通过按钮改变运动方向的功能

  var inputs = document.getElementsByTagName("input");
  inputs[0].onclick = function() {
   speed = -4;
  }
  inputs[1].onclick = function() {
   speed = 4;
  }
 </script>
 
</html>

JS无缝滚动

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