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Implementing JD.com-like image carousel effect based on JavaScript_javascript skills

WBOY
WBOYOriginal
2016-05-16 15:33:191356browse

js implements JD.com imitation picture carousel effect. When the mouse is moved over the window, the timer is stopped. When the mouse leaves the window, the timer is started. When the mouse is moved over the tab, the timer is stopped and manual switching is performed. By defining the timer encapsulation function run, encapsulates the function changeOption to achieve this effect. The code is simple and easy to understand. Friends who need it can just copy and transfer it. 

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <style type="text/css">
    *{margin:0;padding:0;list-style:none;}
    a{text-decoration: none;color: #fff;}
    #flash{width: 730px;height: 454px;margin: 100px auto;position: relative;cursor: pointer;}
    #pic li{position: absolute;top: 0;left: 0;z-index: 1;display: none;}
    #num{position: absolute;left: 40%;bottom: 10px;z-index: 2;cursor:default;}
    #num li{float: left;width: 20px;height: 20px;border-radius: 50%;background: #666;margin: 3px;line-height: 20px;text-align: center;color: #fff;cursor: pointer;}
    #num li.active{background: #f00;}
    .arrow{height: 60px;width: 30px;line-height: 60px;text-align: center;display: block;position: absolute;top:45%;z-index: 3;display: none;}
    .arrow:hover{background: rgba(0,0,0,0.7);}
    #flash:hover .arrow{display: block;}
    #left{left: 2%;}
    #right{right: 2%;}
  </style>
  <script type="text/javascript">
    function $(id) {
      return typeof id==='string'&#63;document.getElementById(id):id;
    }
    window.onload=function(){
      var index=0;
      var timer=null;
      var pic=$("pic").getElementsByTagName("li");
      var num=$("num").getElementsByTagName("li");
      var flash=$("flash");
      var left=$("left");
      var right=$("right");
      //单击左箭头
      left.onclick=function(){
        index--;
        if (index<0) {index=num.length-1};
        changeOption(index);
      }
      //单击右箭头
      right.onclick=function(){
        index++;
        if (index>=num.length) {index=0};
        changeOption(index);
      }      
      //鼠标划在窗口上面，停止计时器
      flash.onmouseover=function(){
        clearInterval(timer);
      }
      //鼠标离开窗口，开启计时器
      flash.onmouseout=function(){
        timer=setInterval(run,2000)
      }
      //鼠标划在页签上面，停止计时器，手动切换
      for(var i=0;i<num.length;i++){
        num[i].id=i;
        num[i].onmouseover=function(){
          clearInterval(timer);
          changeOption(this.id);
        }
      }    
      //定义计时器
      timer=setInterval(run,2000)
      //封装函数run
      function run(){
        index++;
        if (index>=num.length) {index=0};
        changeOption(index);
      }
      //封装函数changeOption
      function changeOption(curindex){
        console.log(index)
        for(var j=0;j<num.length;j++){
          pic[j].style.display="none";
          num[j].className="";
        }
        pic[curindex].style.display="block";
        num[curindex].className="active";
        index=curindex;
      }
    }
  </script>
</head>
<body>
  <div id="flash">
    <ul id="pic">
      <li style="display:block"><img src="http://img13.360buyimg.com/da/jfs/t2242/262/578407619/87636/4ffe0c5/56187ed2Nfed9a5b3.jpg" alt=""></li>
      <li><img src="http://img13.360buyimg.com/da/jfs/t2143/111/577347825/96150/e27180bd/561889b3N42ee62b5.jpg" alt=""></li>
      <li><img src="http://img20.360buyimg.com/da/jfs/t1825/234/1750370913/97529/b9229832/560b5ad3N054605f7.jpg" alt=""></li>
      <li><img src="http://img10.360buyimg.com/da/jfs/t2026/215/573306345/95654/a0211937/5618a735N1b3d8423.jpg" alt=""></li>
      <li><img src="http://img20.360buyimg.com/da/jfs/t2065/362/579832759/78899/6f349917/5618c680N3752bacc.jpg" alt=""></li>
      <li><img src="http://img10.360buyimg.com/da/jfs/t2023/45/384256123/101565/9b6e5daf/5604bdceN8c7d2ccf.jpg" alt=""></li>
    </ul>
    <ol id="num">
      <li class="active">1</li>
      <li>2</li>
      <li>3</li>
      <li>4</li>
      <li>5</li>
      <li>6</li>
    </ol>
    <a href="javascript:;" class="arrow" id="left"><</a>
    <a href="javascript:;" class="arrow" id="right">></a> 
  </div>
</body>
</html>

Isn’t the above code very simple? Based on javascript, the imitation Jindong picture carousel effect was successfully created. Due to time reasons, I did not show you the renderings, so please forgive me.

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