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));   }  }