原生js轮播（仿慕课网）

效果如下：

代码如下：

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>javascript</title>
 <style>
 *{margin:0;padding:0;border:0;}
 a{text-decoration:none;color:#fff;font-size:40px;line-height:200px;display:none;text-align:center;}
 #container{width:300px;height:200px;margin:50px auto;position:relative;overflow:hidden;}
 #list{width:2100px;height:200px;position:absolute;top:0;}
 #list span{width:300px;height:200px;display:inline-block;text-align:center;font-size:22px;float:left;color:#fff;}
 .one{background:red;}
 .two{background:orange;}
 .three{background:blue;}
 .four{background:green;}
 .five{background:black;}
 #buttons{width:200px;height:30px;position:absolute;bottom:0px;left:100px;z-index:9;}
 #buttons span{display:inline-block;cursor:pointer;width:12px;height:12px;border-radius:6px;background: #2a2a2a}
 #prev{width:40px;height:200px;position:absolute;left:0px;}
 #next{width:40px;height:200px;position:absolute;right:0px;}
 #container .on{background:#fff;}
 </style>
</head>
<body>
 <div id="container">
 <div id="list" style="left:-300px">
 <span class="five">我是黑色第五张</span>
 <span class="one">我是红色第一张</span>
 <span class="two">我是黄色第二张</span>
 <span class="three">我是蓝色第三张</span>
 <span class="four">我是绿色第四张</span>
 <span class="five">我是黑色第五张</span>
 <span class="one">我是红色第一张</span>
 </div>
 <div id="buttons">
 <span class="on" index="1"></span>
 <span index="2"></span>
 <span index="3"></span>
 <span index="4"></span>
 <span index="5"></span>
 </div>
 <a id="prev" href="javascript:;" rel="external nofollow" rel="external nofollow" ><</a>
 <a id="next" href="javascript:;" rel="external nofollow" rel="external nofollow" >></a>
 </div>
 <script>
  var container = document.getElementById('container'),
   list = document.getElementById('list'),
   buttons = document.getElementById('buttons').getElementsByTagName('span'),
   prev = document.getElementById('prev'),
   next = document.getElementById('next'),
   index = 1,
   len = 5,
   interval = 3000,
   animated = false,
   timer;
  function animate(offset){
  if(offset == 0) return;
  animated = true;
  var time = 150,
  inter = 5,
  speed = offset/(time/inter),
  left = parseInt(list.style.left) + offset;
 var go = function(){
 if((speed>0 && parseInt(list.style.left)<left) || (speed<0 && parseInt(list.style.left)>left)){
  list.style.left = parseInt(list.style.left) + speed + 'px';
  setTimeout(go,inter);
 }else{
  list.style.left = left + 'px';
  if(left > -100){
  list.style.left = -300*len + 'px';
  }
  if(left < (-300*len)){
  list.style.left = '-300px'
  }
  animated = false;
 }
 }
 go();
  }
  function showButton(){
  for(var i=0 ; i<buttons.length ; i++){
  if(buttons[i].className == 'on'){
  buttons[i].className = '';
  break;
  }
  }
  buttons[index - 1].className = 'on';
  }
  function play(){
  timer = setTimeout(function(){
  next.onclick();
  play();
  },interval);
  }
  function stop(){
  clearTimeout(timer);
  }
  next.onclick = function(){
  if(animated) {
  return;
  }
  if(index == 5){
  index = 1;
  }else{
  index++;
  }
  animate(-300);
  showButton();
  }
  prev.onclick = function(){
  if(animated) {
  return;
  }
  if(index == 1){
  index = 5;
  }else{
  index--;
  }
  animate(300);
  showButton();
  }
  for (var i = 0; i < buttons.length; i++) {
    buttons[i].onclick = function () {
     if (animated) {
      return;
     }
     if(this.className == 'on') {
      return;
     }
     var myIndex = parseInt(this.getAttribute('index'));
     var offset = -300 * (myIndex - index);
     animate(offset);
     index = myIndex;
     showButton();
    }
   }
  container.onmouseover = function(){
  prev.style.display = next.style.display = 'block';
  stop();
  }
  container.onmouseout = function(){
  prev.style.display = next.style.display = 'none';
  play();
 }
  play();
 </script>
</body>
</html>

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