灵活使用数组制作图片切换js实现

<div id="box">1,2,3,4</div>
<input type="button" value='切换' id='input'>
<script>
 window.onload=function(){
 var oDiv=document.getElementById('box');
 var oInput=document.getElementById('input');

 oInput.onclick=function(){
  var arr=oDiv.innerHTML.split(',');
  // console.log(arr);
  arr.push(arr[0]);//将第一个加到最后，删掉第一个
  arr.shift();
  oDiv.innerHTML=arr;
 }
 }
</script>

window.onload=function(){
 var aDiv=document.getElementsByTagName('div');
 var aInput=document.getElementsByTagName('input');
 var arr=[];//创建空数组用于存放属性

 for(var i=0;i<aDiv.length;i++){
 console.dir(getStyle(aDiv[i],'left'));//获取到纯净的最终样式
 //将属性作为 符合数组 加入arr中，可用于多属性
   arr.push([getStyle(aDiv[i],'left'),getStyle(aDiv[i],'top')]);
 }
 // console.dir(arr);

 aInput[0].onclick=function(){//将第一个加到最后，删掉第一个
 arr.push(arr[0]);
 arr.shift();
 for(var i=0;i<aDiv.length;i++){//操作完数组后重新赋值
  aDiv[i].style.left=arr[i][0];
  aDiv[i].style.top=arr[i][1];
 }
 };
 aInput[1].onclick=function(){//将最后一个加到最前，删最后
 arr.unshift(arr[arr.length-1]);
 arr.pop();
 for(var i=0;i<aDiv.length;i++){
  aDiv[i].style.left=arr[i][0];
  aDiv[i].style.top=arr[i][1];
 }
 };
 function getStyle(obj,attr){//获取最终样式
 if(obj.currentStyle){
  return obj.currentStyle[attr];
 }else{
  return getComputedStyle(obj,false)[attr];
 }
 }
}

<div id="box">
 <ul>
 <li class='pos_0'><img src="images/1.png" width='300'></li>
 <li class='pos_1'><img src="images/1.jpg" width='400'></li>
 <li class='pos_2'><img src="images/2.jpg" width='500'></li>
 <li class='pos_3'><img src="images/3.jpg" width='400'></li>
 <li class='pos_4'><img src="images/1.jpg" width='300'></li>
 </ul>
 <span class='dir dirl'></span>
 <span class='dir dirr'></span>
</div>

#box{width:700px;height:300px;position:relative;margin:20px auto;text-align: center;}
#box ul{list-style: none;}
#box ul li{position:absolute;}
#box ul li.pos_0{top:50px;left:20px;z-index:1;opacity:0.5;}
#box ul li.pos_1{top:20px;left:60px;z-index:2;opacity:0.8;}
#box ul li.pos_2{top:0px;left:100px;z-index:3;opacity:1;}
#box ul li.pos_3{top:20px;left:240px;z-index:2;opacity:0.8;}
#box ul li.pos_4{top:50px;left:380px;z-index:1;opacity:0.5;}
.dir{display: inline-block;width:45px;height:100px;background:url('images/button.png') no-repeat;
position:absolute;top:60px;z-index:4;}
.dirl{background-position: 0px 0;left:40px;}
.dirr{background-position: -55px 0;right:40px;}

window.onload=function(){
 var oPre=document.getElementsByClassName('dir')[0];
 var oNext=document.getElementsByClassName('dir')[1];
 var aLi=document.getElementsByTagName('li');
 var arr=[];
 for(var i=0;i<aLi.length;i++){
 var oImg=aLi[i].getElementsByTagName('img')[0];
 // console.log(getStyle(aLi[i],'left'));
 // console.log(parseInt(getStyle(aLi[i],'opacity')*100));
 // console.log(getStyle(aLi[i],'z-index'));
 // console.log(oImg.width);
 arr.push([
  parseInt(getStyle(aLi[i],'top')),
  parseInt(getStyle(aLi[i],'opacity')*100),
  parseInt(getStyle(aLi[i],'z-index')),
  oImg.width
  ]);
 // console.log(arr[i][2]);
 }
 // console.dir(arr);
 oPre.onclick=function(){//左
 arr.push(arr[0]);
 arr.shift();
 for(var i=0;i<aLi.length;i++){

  var oImg=aLi[i].getElementsByTagName('img')[0];
  //console.log(arr[i][2]);
  startMove(aLi[i],{
  left:arr[i][0],
  top:arr[i][1],
  opacity:arr[i][2],
  });
  aLi[i].style.zIndex=arr[i][3];
  startMove(oImg,{width:arr[i][4]});
 }
 };
 oNext.onclick=function(){//右
 arr.unshift(arr[arr.length-1]);
 arr.pop();
 for(var i=0;i<aLi.length;i++){

  var oImg=aLi[i].getElementsByTagName('img')[0];

  startMove(aLi[i],{
  left:arr[i][0],
  top:arr[i][1],
  opacity:arr[i][2],
  });

  aLi[i].style.zIndex=arr[i][3];
  startMove(oImg,{width:arr[i][4]});
 }
 };
 function getStyle(obj,attr){//得到是带单位的数值
 if(obj.currentStyle){
  return obj.currentStyle[attr];
 }else{
  return getComputedStyle(obj,false)[attr];
 }
 }
}