How does js realize the JD carousel effect?-JS Tutorial-php.cn

How does js realize the JD carousel effect?

零下一度

Release： 2017-07-02 10:22:59

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This article mainly introduces the effect of js to realize Jingdong carousel in detail. It has certain reference value. Interested friends can refer to it.

The example of this article is to share with you the js to realize Jingdong. The specific code for the carousel effect is for your reference. The specific content is as follows

<!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>
<p 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-->
  <p class="arrow">
    <span><</span>
    <span>></span>
  </p>
</p>
</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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