原生js实现旋转木马轮播图效果

话不多说，请看代码：

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>旋转木马特效</title>
 <style type="text/css">
 *{margin: 0;padding: 0;list-style:none;}
 #demo{width:1200px;margin:100px auto 0;}
 #innerht{width:1200px;height:500px;position:relative;}
 ul li{position:absolute;top:0;left:0;z-index:1;}
 ul li img{width:100%;}
 #corrow{position:absolute;width:100%;top:50%;opacity:0;z-index:99;}
 #btn_lef,#btn_rig{position:absolute;height:112px;width:76px;top:50%;margin-top:-56px;}
 #btn_lef{left:0;}
 #btn_rig{right:0;}
 </style>
</head>
<body>
 <div id="demo">
 <div id="innerht">
  <ul>
  <li><a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="http://www.qdfuns.com/misc.php?mod=attach&genre=editor&aid=dac666f84f6ad05ec026ad655ea0f159" alt=""></a></li>
  <li><a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="http://www.qdfuns.com/misc.php?mod=attach&genre=editor&aid=89c2213f2b614db88b5724b82dafc02a" alt=""></a></li>
  <li><a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="http://www.qdfuns.com/misc.php?mod=attach&genre=editor&aid=e7969486909c076abf795995bdc3da54" alt=""></a></li>
  <li><a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="http://www.qdfuns.com/misc.php?mod=attach&genre=editor&aid=b404e53a3f4dd7e97438693e8e2d4082" alt=""></a></li>
  <li><a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="http://www.qdfuns.com/misc.php?mod=attach&genre=editor&aid=ed309dded163d172b53154b2046eb1a2" alt=""></a></li>
  </ul>
  <div id="corrow">
  <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="btn_lef"><img src="http://www.qdfuns.com/misc.php?mod=attach&genre=editor&aid=206927b03b97b194bc04cdcaf0e10a33" height="112" width="76" alt=""></a>
  <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" id="btn_rig"><img src="http://www.qdfuns.com/misc.php?mod=attach&genre=editor&aid=0e84253cccdf667e293522a0a107eeec" height="112" width="76" alt=""></a>
  </div>
 </div>
 </div>
</body>
<script type="text/javascript">
 (function(window){
 function $(id){
  return document.getElementById(id);
 };
//每张图片对应的样式
 var tempArr = [
  {
  "width":400,
  "top":20,
  "left":50,
  "opacity":0.2,
  "zIndex":2
  },
  {
  "width":600,
  "top":70,
  "left":0,
  "opacity":0.8,
  "zIndex":3
  },
  {
  "width":800,
  "top":100,
  "left":200,
  "opacity":1,
  "zIndex":4
  },
  {
  "width":600,
  "top":70,
  "left":600,
  "opacity":0.8,
  "zIndex":3
  },
  {
  "width":400,
  "top":20,
  "left":750,
  "opacity":0.2,
  "zIndex":2
  }
 ];
 // 设置限流函数
 var onOff = true ;
 // 获取对象
 var left = $("btn_lef"),right = $("btn_rig"),innerht = $("innerht"),ul = innerht.children[0],lis = ul.children,arrow = $("corrow");
 // 给每个li添加样式
 addStyle();
 // 大盒子的hover事件
 innerht.onmouseover = function(){
  animate(arrow,{"opacity":1});
 };
 innerht.onmouseout = function(){
  animate(arrow,{"opacity":0});
 };
 // 右箭头点击事件
 right.onclick = function(){
  if( onOff ){
  onOff = false;
  var atop = tempArr.shift();
  tempArr.push( atop );
  addStyle();
  };
 };
 // 左箭头点击事件
 left.onclick = function(){
  if( onOff ){
  onOff = false;
  var apop = tempArr.pop();
  tempArr.unshift( apop );
  addStyle();
  };
 };
 function addStyle(){
  for( i = 0 ; i < lis.length ; i++ ){
  animate(lis[i],tempArr[i],function(){
   onOff = true;
   console.log(onOff);
  });
  };
 };
 // 设置animate函数
 function animate(obj,json,fn){
  clearInterval(obj.timer);
  obj.timer = setInterval(function(){
  var flog = true ;
  for( k in json ){
   if( k === "zIndex" ){
   obj.style[k] = json[k];
   }else if( k === "opacity" ){
   var leader = getStyle(obj,k) * 100 ;
   var target = json[k] * 100 ;
   var step = ( target - leader ) / 10 ;
   step = step > 0 ? Math.ceil( step ) : Math.floor( step ) ;
   // 浮点数判断相等时是不准确的
   // 所以不能写leader = ( leader + step )/100;
   // 保持leader和target都是整数，便于下面判断相等
   leader = leader + step ;
   obj.style[k] = leader / 100;
   }else{
   var leader = parseInt( getStyle(obj,k) ) || 0 ;
   var target = json[k];
   var step = ( target - leader ) / 10 ;
   step = step > 0 ? Math.ceil( step ) : Math.floor( step ) ;
   leader = leader + step ;
   obj.style[k] = leader + "px";
   };
   if( leader !== target ){
   flog = false ;
   };
  };
  console.log(flog);
  if( flog ){
   clearInterval( obj.timer );
   if( fn ){
   fn();
   };
  };
  }, 15);
 };
 // 设置getStyle函数，获取计算后的样式
 function getStyle(obj,attr){
  if( window.getComputedStyle ){
  return window.getComputedStyle(obj,null)[attr];
  }else{
  return obj.currentStyle[attr];
  };
 };
 })(window)
</script>
</html>

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