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纯JavaScript手写图片轮播代码

2020-11-27 来源:九壹网

废话不多说了,直接给大家贴js代码实现手写图片轮播的代码了,代码非常简单,具体代码如下所示:

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>js图片轮播切换</title>
<style type="text/css">
  .imgCon{width: 400px;height: 400px;border: 2px solid #DCDCDC;margin: 100px auto;position: relative;}
  .imgCon span{display: block;position: absolute;left: 0px;width: 100%;height: 30px;background: #808080;text-align: center;font-size: 18px;line-height: 30px;}
  .numStyle{top: 0px;}
  .textStyle{bottom: 0px;}
  .imgCon strong{font-size: 30px;color: #000000;position: absolute;top: 50%;display: block;background: gray;cursor: pointer;}
  .imgCon .prev{left: 10px;}
  .imgCon .next{left: 370px;}
  img{width:400px;height: 400px;}
</style>
</head>
<body>
  <div class="imgCon">
    <span id="numCon" class="numStyle">加载中...</span>
    <span id="textCon" class="textStyle">加载中...</span>
    <strong id="prev" class="prev"><</strong>
    <strong id="next" class="next">></strong>
    <img src="" id="imgChange"/>
  </div>
  <script type="text/javascript">
    var numCon = document.getElementById('numCon');
    var textCon = document.getElementById('textCon');
    var prev = document.getElementById('prev');
    var next = document.getElementById('next');
    var imgChange = document.getElementById('imgChange');
    var imgArr = ['img/ad1.jpg','img/ad2.jpg','img/ad3.jpg','img/ad4.jpg'];
    var imgText = ['第一张','第二张','第三张','第四张'];
    var num = 0;
    //数字 图片变化函数
    function imgTab(){
      numCon.innerHTML = num+1 + '/' + imgArr.length; //数字变化
      textCon.innerHTML = imgText[num]; //底部文字内容变化
      imgChange.src = imgArr[num]; //图片变化
    }
    imgTab();
    //下一张 按钮
    next.onclick = function(){
    num++;
    if(num == imgArr.length){
      num = 0;
    }
    imgTab();
    }
    //上一张 按钮
    prev.onclick = function(){
      num--;
    if(num == -1){
      num = imgArr.length-1;
    }
    imgTab();
    }
  </script>
</body>
</html>
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