JavaScript实现简单图片轮播效果

时间:2020-05-16 lettle_redhat 人气:0
本文实例为大家分享了js实现简单图片轮播的具体代码，最终实现效果图
代码块
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title></title>
     <style>
    * {
      margin: 0;
      padding: 0
    }

    ul {
      list-style: none
    }

    img {
      vertical-align: top
    }

    .box {
      width: 490px;
      height: 170px;
      margin: 100px auto;
      padding: 5px;
      border: 1px solid #ccc;
    }

    .inner {
      width: 490px;
      height: 170px;
      background-color: pink;
      overflow: hidden;
      position: relative;
    }

    .inner ul {
      width: 1000%;
      position: absolute;
      top: 0;
      left: 0;
    }

    .inner li {
      float: left;
    }

    .square {
      position: absolute;
      right: 10px;
      bottom: 10px;
    }

    .square span {
      display: inline-block;
      width: 16px;
      height: 16px;
      background-color: #fff;
      text-align: center;
      line-height: 16px;
      cursor: pointer;
    }

    .square span.current {
      background-color: orangered;
      color: #fff;
    }
  </style>
  </head>
  <body>
    <div class="box" id="box">
      <div class="inner">
        <ul>
          <li><a href="#"><img src="images/01.jpg" /></a></li>
          <li><a href="#"><img src="images/02.jpg" /></a></li>
          <li><a href="#"><img src="images/03.jpg" /></a></li>
          <li><a href="#"><img src="images/04.jpg" /></a></li>
          <li><a href="#"><img src="images/05.jpg" /></a></li>
        </ul>
        <div class="square">
          <span class="current">1</span>
          <span>2</span>
          <span>3</span>
          <span>4</span>
          <span>5</span>
        </div>
      </div>
    </div>


  <script type="text/javascript">
    //鼠标经过按钮 按钮排他
    var box = document.getElementById("box");
    var inner = box.children[0];      //获取box下的第一个元素，也就是inner
    var ul = inner.children[0];       //获取inner下的ul
    var squareList = inner.children[1];   //获取inner下的第二个元素
    var squares = squareList.children;   //获取所有的按钮
    var imgWidth = inner.offsetWidth;
//   alert(imgWidth);
    //给每个按钮注册鼠标经过事件
    for(var i=0; i<squares.length; i++){
      squares[i].index = i;      //把索引保存在自定义属性中
      squares[i].onmouseover = function(){  //鼠标经过事件
        //排他 干掉所有人 
        for(var j=0; j<squares.length; j++){
          squares[j].className = "";
        }
        //留下我自己
        this.className = "current";
        //以动画的方式把ul移动到指定的位置
        //目标 和当前按钮索引有关，和图片宽度有关 而且是负数
        var target = -this.index * imgWidth;  //获取到索引
        animate(ul,target);
      }
    }


    function animate(obj, target) {
      clearInterval(obj.timer);
      obj.timer = setInterval(function () {
        var step = 20;
        var step = obj.offsetLeft < target ? step : -step;
        if (Math.abs(obj.offsetLeft - target) > Math.abs(step)) {
          obj.style.left = obj.offsetLeft + step + "px";
        } else {
          obj.style.left = target + "px";
          clearInterval(obj.timer);
        }
      }, 15)
    }


  </script>



  </body>
</html>
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