【原生JS】层叠轮播图

又是轮播？没错，换个样式玩轮播。

HTML:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>before</title>
</head>
<body>
  <div class="box">
    <img class="front" src="img/A.jpg" alt="PIC">
    <img class="back" src="img/B.jpg" alt="PIC">
    <img class="active" src="img/C.jpg" alt="PIC">
    <div class="btns">
      <span class="btn">&lt;</span>
      <span class="btn">&gt;</span>
    </div>
  </div>
</body>
</html>

CSS:

  <style>
    .box {width: 1200px; height: 300px; transform-style: perserve-3d; margin: 50px auto; position: relative;}
    .box img{width:600px; position: absolute; top: 60px; transition:all .3s linear;}
    
    .box:hover .btn{opacity: 1;}

    .front {left: 0px;}
    .back {left: 600px;}   
    .active {left: 300px; transform: scale(1.5); z-index: 10;}
    
    .btns .btn {width: 60px; height: 60px; display: block; position: absolute; background-color: rgba(0,0,0,.5); font-size: 50px; font-family: "微软雅黑"; color:rgba(255,255,255,.5); line-height: 55px; text-align: center; cursor: pointer; z-index: 100; opacity: 0; transition:opacity .3s linear;} 
    .btns .btn:first-child {top: 125px;}
    .btns .btn:last-child {top: 125px; right: 0px;}
  </style>

JS:

  <script>
    onload = function(){
      var btns = document.getElementsByClassName('btn'),
          imgs = document.getElementsByClassName('box')[0].getElementsByTagName('img');

      var index = 2,
          front = 0,
          back = 0,
          offset = false,
          timer = setInterval(timer,5000);
          


      for(var i=0;i<btns.length;i++){
        (function(i){
          btns[i].onclick = function(){click(i)};
        })(i);

        btns[i].onmouseover = function(){
          offset = true;
        }
        btns[i].onmouseout = function(){
          offset = false;
        }
      }

      for(var i=0;i<imgs.length;i++){
        imgs[i].onmouseover = function(){
          offset = true;
        }
        imgs[i].onmouseout = function(){
          offset = false;
        }
      }

      function timer(){
        console.log(offset)
        if(offset){
          return;
        }
        else{
          click(1)
        }
      }

      function click(x){
        imgs[index].setAttribute('class','');
        if(x === 0){
         if(--index < 0){
            index = --imgs.length;
          }
          front = back = index;
          if(++front > --imgs.length){front = 0}
          if(--back < 0){back = --imgs.length}
          imgs[front].style.zIndex = '1';
          imgs[back].style.zIndex = '0';
        }
        else{     
          if(++index > --imgs.length){
            index = 0;        
          }
          front = back = index;
          if(++front > --imgs.length){front = 0}
          if(--back < 0){back = --imgs.length}
          imgs[front].style.zIndex = '0';
          imgs[back].style.zIndex = '1';
        }
        imgs[index].style.zIndex = '10';
        imgs[front].setAttribute('class','front')
        imgs[back].setAttribute('class','back')  
        imgs[index].setAttribute('class','active');
      }
    }
  </script>

转载请指明出处!

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原文地址：https://www.cnblogs.com/GruntFish/p/6864494.html