原生JS实现层叠轮播图

时间：2021-05-25

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>wtf</title></head><body> <div class="container"> <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> </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>

精彩专题分享：jQuery图片轮播 JavaScript图片轮播 Bootstrap图片轮播

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