JS实现图片切换特效

时间:2021-04-02 人气:0

知识点：

1.window.onload网页全部加载完后再执行
2.获取元素设置属性
3.临界情况判断

运行效果：

点击上一张下一章切换图片

代码：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<style>
  #box{
    width: 1200px;
    margin: 0 auto;
  }
</style>
<body>
  <div id="box">
    <img id="icon" src="images/阿鲁1.gif" alt="">
    <p></p>
    <button id="prep">上一张</button>
    <button id="next">下一张</button>
  </div>
<script>
  window.onload = function (ev) {
    // 1. 获取标签
    var prep = document.getElementById('prep');
    var next = document.getElementById('next');
    var icon = document.getElementById('icon');
    // 2. 点击
    var currentIndex = 1, minIndex=1, maxIndex=10;
    prep.onclick = function (ev1) {
      if (currentIndex === minIndex){
        currentIndex = maxIndex;
      }else{
        currentIndex--;
      }
      icon.setAttribute('src','images/阿鲁'+ currentIndex +'.gif');
    };
    next.onclick = function (ev1) {
      if (currentIndex === maxIndex){
        currentIndex = minIndex;
      }else {
        currentIndex++;
      }
      icon.setAttribute('src','images/阿鲁'+ currentIndex +'.gif');
    }
  }
</script>
</body>
</html>

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