js实现京东轮播图效果

本文实例为大家分享了js实现京东轮播图效果的具体代码，供大家参考，具体内容如下

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    body,ul,li{padding:0;margin:0;}
    li{list-style-type:none;}
    .wrap{
      position:relative;
      width:480px;
      height:260px;
      margin:100px auto;
    }
    .wrap>ul>li{position:absolute;display:none;}
    /*隐藏所有的li*/
    .wrap img{width:480px;height:260px;}
    .wrap li:first-child{display:block;}/*显示第一个*/
    .arrow{
      width:480px;
      height:60px;
      position:absolute;
      top:50%;
      margin-top:-30px;
      display:none;
    }
    .arrow>span{
      font-size:24pt;
      line-height:60px;
      display:inline-block;
      width:36px;
      background-color:#CEE5E8;
      text-align:center;
      cursor:pointer;
      opacity:0.5;
      border-radius:5px;/*显示圆框*/
      -webkit-border-radius:5px;
      -moz-border-radius:5px;
      color:black;
    }
    .wrap:hover .arrow{
      display:block;
    }
    .arrow>span:last-child{
      float:right;
    }
  </style>
</head>
<body>
<div class="wrap">
  <!--图片部分-->
  <ul>
    <li>
      <a href="javascript:void(0)">
        <img src="images/1.jpg"/>
      </a>
    </li>
    <li>
      <a href="javascript:void(0)">
        <img src="images/2.jpg"/>
      </a>
    </li>
    <li>
      <a href="javascript:void(0)">
        <img src="images/3.jpg"/>
      </a>
    </li>
    <li>
      <a href="javascript:void(0)">
        <img src="images/4.jpg"/>
      </a>
    </li>
  </ul>
  <!--按钮部分-->
  <div class="arrow">
    <span><</span>
    <span>></span>
  </div>
</div>
</body>
<script src="jquery-1.12.0.min.js"></script>
<script>
  $(function(){
    var count = 0;
    function change() {
      count++;
      if( count == $(".wrap>ul>li").length){
        count = 0;
      }
      $(".wrap>ul>li").eq(count).fadeIn().siblings("li").fadeOut();
    }
    var myTimer = setInterval(change,4000);
    function reRun(){
      myTimer = setInterval(change,4000);
    }
    /*注意jquery中setInterval函数不要加引号和(),否则会报缺少对象*/
    $(".arrow>span").eq(0).click(function(){
      clearInterval(myTimer);
      /*清除计时器，目的在于不会因点击按钮时setInterval事件仍旧执行*/
      count--;
      if( count == -1){
        count = $(".wrap>ul>li").length - 1;
      }      $(".wrap>ul>li").eq(count).fadeIn().siblings("li").fadeOut();
      setTimeout(reRun,0);
      /*重新启动计时器，保证不点击按钮是能正常切换*/
    });
    $(".arrow>span").eq(1).click(function(){
      clearInterval(myTimer);
      count++;
      if( count == $(".wrap>ul>li").length){
        count = 0;
      }    $(".wrap>ul>li").eq(count).fadeIn().siblings("li").fadeOut();
      setTimeout(reRun,0);
    });
  });
</script>
</html>

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