js实现鼠标切换图片（无定时器）

时间：2021-08-13 07:36:32|栏目：JavaScript代码|点击：次

本文实例为大家分享了js实现鼠标切换图片的具体代码，供大家参考，具体内容如下

实现效果，可以利用鼠标移动在对应的小点点上，或者点击左右两侧的箭头切换图片，并在图片的上方显示出图片的页数，下方显示出对应图片的标题。

全部代码如下：

<!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>图片切换</title>
  <style>
    .picture {
      position: relative;
      width: 500px;
      height: 333px;
      margin: 0 auto;
      border: 2px solid rgb(231, 127, 217);
      overflow: hidden;
    }

    .radius {
      width: 100%;
      height: 10px;
      position: absolute;
      bottom: 30px;
      text-align: center;
    }

    .pg {     //图片上方页码
      position: absolute;
      margin: 0;
      width: 100%;
      height: 20px;
      background-color: rgba(0, 0, 0, .4);
      text-align: center;
      font-size: 16px;
      font-weight: 600;
      color: #fff;
    }

    .title {
      position: absolute;
      width: 100%;
      bottom: 0px;
      text-align: center;
      font-size: 16px;
      font-weight: 600;
      color: rgb(21, 223, 72);
    }

    span {
      display: inline-block;
      border: 10px solid #fdfdfd;
      border-radius: 50%;
    }

    .active {
      border: 10px solid #656466;
    }

    /* 左右箭头 */
    .arrowhead-left,
    .arrowhead-right {
      position: absolute;
      width: 41px;
      height: 69px;
      font-size: 30px;
      line-height: 70px;
      text-align: center;
      color: #D6D8D4;
      background-color: rgba(0,0,0,.3);
    }

    .arrowhead-left {
      left: 0;
      top: 40%;
    }

    .arrowhead-right {
      right: 0;
      top: 40%;
    }
  </style>
</head>

<body>
  <div class="picture">
    <!-- 图片页码 -->
    <p class="pg">封面</p>
    <img src="./image/d8.jpeg" alt="">

    <!-- 小圆点点 -->
    <p class="radius"></p>
    <!-- 图片的下面标题 -->
    <p class="title">标题</p>

    <!-- 左右箭头 -->
    <div class="arrowhead-left" id="al"> < </div> 
    <div class="arrowhead-right" id="ar"> > </div>
  </div>

  <script>
    var address = ["./image/d1.jpeg", "./image/d2.jpeg", "./image/d3.jpeg", "./image/d4.jpeg", "./image/d5.jpeg", "./image/d7.jpeg"];
    // var imgs = document.getElementsByTagName("img");
    var imgs = document.querySelector("img");
    var len = address.length;
    var str = "";
    var pp = document.getElementsByTagName("p");//获取的是一个集合
    // var pp = document.querySelector("p");  //获取的是一个元素
    var al = document.getElementById("al");
    var ar = document.getElementById("ar");
    //添加span标签
    for (i = 0; i < len; i++) {
      str += ' <span></span>'
    }
    console.log(str);
    console.log(pp);
    pp[1].innerHTML = str;
    var spans = pp[1].getElementsByTagName('span');
    spans[0].className = 'active';

    for (i = 0; i < len; i++) {
      spans[i].index = i;
      spans[i].onmouseover = function () {  //所有圆点的类为空
        for (i = 0; i < len; i++) {
          spans[i].className = "";
        }
        this.className = 'active';      //给点击的span（圆点）添加类名
        imgs.src = address[this.index];  
        pp[0].innerHTML = [this.index + 1] + "/6";
        pp[2].innerHTML = "风光" + [this.index + 1];

      }
    }
    var n = 0 ;
    ar.onclick = function () {

      for (i = 0; i < len; i++) {
        spans[i].className = "";
      }

      spans[n].className = "active";
      imgs.src = address[n];
      pp[0].innerHTML = (n+1) + "/6";
      pp[2].innerHTML = "风光" +(n+1);
      if (n<5) {
        n++; 
      }
      else {
       n=0;
      }
    }
    al.onclick = function () {

     for (i = 0; i < len; i++) {
       spans[i].className = "";
     }
     
     spans[n].className = "active";
     imgs.src = address[n];
     pp[0].innerHTML = (n+1) + "/6";
     pp[2].innerHTML = "风光" +(n+1);
     if (n>0) {
       n--; 
     }
     else {}
      n=(len-1);
     }
     }
  </script>
</body>

</html>

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