轮播图水平平移-CFANZ编程社区

轮播图水平平移

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    ul,
    li {
      list-style: none;
      margin: 0;
      padding: 0;
    }

    #wrap {
      width: 450px;
      height: 84px;
      border: 1px solid #000;
      margin: 100px auto;
      position: relative;
      overflow: hidden;
    }

    .list {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0px;
    }

    .list::after {
      content: "";
      display: block;
      clear: both;
    }

    .list li {
      width: 150px;
      height: 84px;
      float: left;
    }

    .list li img {
      width: 100%;
      height: 100%;
    }
  </style>
</head>

<body>

  <div id="wrap">
    <ul class="list">
      <li><img src="./images/1.jpg" alt=""></li>
      <li><img src="./images/2.jpg" alt=""></li>
      <li><img src="./images/3.jpg" alt=""></li>
    </ul>
  </div>



  <script>

    var listEl = document.getElementsByClassName('list')[0]
    // 把list中的内容复制一份
    listEl.innerHTML += listEl.innerHTML


    // 获取li
    var lis = document.getElementsByTagName('li')
    listEl.style.width = lis[0].offsetWidth * lis.length + "px"


    setInterval(function () {
      listEl.style.left = listEl.offsetLeft - 1 + 'px'

      // 如果ul的左边距 小于 它宽度的一半 
      if (listEl.offsetLeft <= -listEl.offsetWidth / 2) {
        listEl.style.left = '0px'
      }
    }, 20)



  </script>

</body>

</html>
在这里插入图片描述
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