原生JS实现匀速图片轮播动画

<div class="w main clearfix"><!--主内容部分开始-->
<div class="slider"><!--轮播图部分开始-->
 <ul class="imgs" id="slider_imgs">
  <li><img src="images/slider01.jpg" id="slider1" alt=""/>
  </li>
  <li><img src="images/slider02.jpg" id="slider2" alt=""/>
  </li>
  <li><img src="images/slider03.jpg" id="slider3" alt=""/>
  </li>
  <li><img src="images/slider04.jpg" id="slider4" alt=""/>
  </li>
  <li><img src="images/slider05.jpg" id="slider5" alt=""/>
  </li>
  <li><img src="images/slider01.jpg" id="slider0" alt=""/>
  </li>
 </ul>
  <div class="arrow" id="arrow">
  <a href="javascript:;" class="arrow_1"><</a>
  <a href="javascript:;" class="arrow_2">></a>
  </div>
 </div><!--轮播图部分结束-->
 </div>

.slider ul.imgs{height:453px;width:4380px;position:absolute;}
.slider ul.imgs li{display:block; width:730px;height:453px;float:left;}
.slider .circle{position:absolute;left:50%;bottom:8px;}
.slider .circle li{cursor:pointer;float:left;width:18px;height:18px;margin:4px;background-color:#3e3e3e;border-radius: 50%;text-align: center;color:#fff;}
.slider .circle li.current{background:pink;color:white;}

/*
***obj:做动画的DOM对象
***target:对象最终运动到的目标位置（X轴）
*/
function animate(obj,target) {

//每次调用要先清定时器
  clearInterval(obj.Timer);

//根据目标位置判断移动的方向，每到目标位置步长为20，否则为-20
  var speed = target>obj.offsetLeft?20:-20;

  obj.Timer =setInterval(function () {

   var left = obj.offsetLeft;

   obj.style.left = left+speed+"px";

   var result = target-left;

//目标位置与当前位置在步长20以内，则到达目标位置
   if(Math.abs(result)<=20){

//停止运动
    clearInterval(obj.Timer);

//有20像素差距 我们直接跳转目标位置
    obj.style.left=target+ "px";

   }

  },2函数：

`这里写代码片0);

 }

function slider(){
   //焦点图信息DOM节点
   var imgs=document.getElementById("slider_imgs");
   var slides =imgs.parentNode;
   var lis =imgs.getElementsByTagName("li");
   var arrows = document.getElementById("arrow");
   var arrowLink=arrows.children;
   //创建小圆点
   var circle=document.createElement("ol");
   circle.setAttribute("class","circle");
   imgs.parentNode.appendChild(circle);

   for(var i=0,len=lis.length-1;i<len;i++){
    var li =document.createElement("li");
    li.innerHTML = i+1;
    circle.appendChild(li);
   }
   //marginLeft=-imgli(length)*olLi(width)/2
   circle.style.marginLeft = (-13*len)+"px";
   var olLis =circle.children;

   olLis[0].className="current";
   //为小圆点添加鼠标事件
   for(var i=0;i<olLis.length;i++){
  //当前小圆点索引
    olLis[i].index = i;
    olLis[i].onmouseover=function () {

     for(var j=0;j<olLis.length;j++) {
      olLis[j].className = "";
     }
     this.className="current";
     //图片切换 imgs的CSS部分加上定位
     animate(imgs,this.index*(-lis[0].offsetWidth));
   //当鼠标挪到定时器，当前播放图片与原点位置回原
     k=z=p=q=this.index;

    };


   }

//鼠标移动到轮播图，不定时播放
   slides.onmouseover=function () {
 //清除自动轮播定时器
    clearInterval(Time);
   };
//鼠标移开，自动轮播    
   slides.onmouseout=function () {
    Time =setInterval(autoPlay,1000);
   };
//定时器部分   
   var Time=null,k=0,z=0;
   Time=setInterval(autoPlay,1000);
   //自动轮播图片，定时器Time
   function autoPlay() {
    k++;
    if(k>lis.length-1){
     imgs.style.left=0;
     k=1;
    }
    animate(imgs,k*(-lis[0].offsetWidth));
    z++;
    if(z>olLis.length-1){
     z=0;
    }
    for(var j=0;j<olLis.length;j++) {
     olLis[j].className = "";
    }
    olLis[z].className="current";
   }
   var q=0;var p=0;
   arrowLink[1].onclick=function () {
    q++;
    if(q>lis.length-1){
     imgs.style.left=0;
     q=1;
    }
    p++;
    if(p>olLis.length-1){
     p=0;
    }
    for(var j=0;j<olLis.length;j++) {
     olLis[j].className = "";
    }
    olLis[p].className="current";
    animate(imgs,q*(-lis[0].offsetWidth));
   }


  }