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基于JavaScript实现带缩略图的轮播效果

高洛峰
高洛峰asal
2017-01-12 10:53:001524semak imbas

先瞄一眼js轮播效果图

基于JavaScript实现带缩略图的轮播效果

代码：

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style>
*{padding:0;margin:0;}
#content {width:400px;height:500px;margin:10px auto;position:relative;border:1px solid #000;color:red;font-size:20px;}
#title, #bottom{position:absolute;width:400px;height:30px;line-height:30px;text-align:center;font-size:20px;background:#f1f1f1;}
#bottom{bottom:0;cursor:pointer;}
#bottom span{display:inline-block;width:15px;height:15px;border-radius:15px;background:#000;text-align:center;line-height:15px;position:relative;}
#bottom span.active{background: #FFFF33;}
#bottom span div {position:absolute;width:110px;height:110px;top:-125px;left:-46px;display:none;}
#bottom span div:after{content:&#39;&#39;;position:absolute;left:49px;bottom:-12px;border-top:7px solid #fff;border-right:5px solid transparent;border-bottom:5px solid transparent;border-left:5px solid transparent;}
#bottom span img {width:100px;height:100px;border:5px solid #fff;}
#left, #right{position:absolute;width:60px;height:60px;border-radius:60px;line-height:60px;font-size:60px;background:#FFFF66;font-weight:bold;text-align:center;top:50%;margin-top:-25px;color:#fff;cursor:pointer;filter(opacity:70);opacity:0.7;}
#left:hover,#right:hover{filter(opacity:100);opacity:1;}
#left{left:0px;}
#right{right:0px;} 
#img{width:400px;height:500px;}
</style>
<script>
window.onload = function () {
  var bottom = $(&#39;bottom&#39;),title = $(&#39;title&#39;),
    img = $(&#39;img&#39;),left = $(&#39;left&#39;),right = $(&#39;right&#39;);
  var aSpan = bottom.getElementsByTagName(&#39;span&#39;);
  var aDiv = bottom.getElementsByTagName(&#39;div&#39;);
  var arr = [&#39;图片一&#39;,&#39;图片二&#39;,&#39;图片三&#39;, &#39;图片四&#39;];
  var num = 0;
  // 初始化
  picTab();
 
  // 点击下一张
  right.onclick = function () {
    if (num === aDiv.length - 1) num = -1;
    num++;
    picTab();
  }
 
  // 点击上一张
  left.onclick = function () {
    if (num === 0) num = aDiv.length;
    num--;
    picTab();
  }
 
  function picTab() {
    title.innerHTML = arr[num];
    img.src = &#39;img/&#39; + (num + 1) + &#39;.png&#39;;
    for ( var i = 0; i < aSpan.length; i++ ) {
      aSpan[i].className = &#39;&#39;;
    }
    aSpan[num].className = &#39;active&#39;;
  }
  // 鼠标移入移出显示缩略图
  for ( var i = 0; i < aSpan.length; i++ ) {
    aSpan[i].index = i;
    aSpan[i].onmouseover = function () {
      aDiv[this.index].style.display = &#39;block&#39;;
    }
    aSpan[i].onmouseout = function () {
      aDiv[this.index].style.display = &#39;none&#39;;
    }
    aSpan[i].onclick = function () {
      num = this.index;
      picTab();
    }
  }
  function $(id) { return document.getElementById(id);}
}
</script>
</head>
<body>
<div id="content">
  <div id="title">带缩略图的轮播</div>
  <div id="left"><</div>
  <div id="right">></div>
  <div id="bottom">
    <span><div><img src="img/1.png"/></div></span>
    <span><div><img src="img/2.png"/></div></span>
    <span><div><img src="img/3.png"/></div></span>
    <span><div><img src="img/4.png"/></div></span>
  </div>
  <img src="" id="img"/>
</div>
</body>
</html>

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