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使用js写个3d banner

2022-07-22 10:52:00 【checkMa】

要点

3d轮播简单写法也比较简单，控制3d效果有三个重要的属性，分别是scaleY (控制3d y轴缩放)，z-index (控制层级)，left(定位)；还有个transition(主要是设置动画时间等效果)；后面请看效果图及代码

图片

在这里插入图片描述

代码

<!DOCTYPE html>
<html>

<head>
	<meta charset="utf-8">
	<title></title>
	<style> .banner-box {
      width: 400px; height: 200px; margin: 0 auto; border: 1px solid #ccc; position: relative; } .banner-box div {
      width: 200px; height: 150px; position: absolute; top: 25px; transition: .5s; cursor: pointer; } .banner-box div:nth-child(1) {
      /* left: 0px; z-index: 1; */ background-color: #00FFFF; /* transform: scale3d(1,.8,1); */ } .banner-box div:nth-child(2) {
      /* left: 50px; z-index: 2; */ background-color: #CCCCCC; /* transform: scale3d(1,.9,1); */ } .banner-box div:nth-child(3) {
      /* left: 100px; z-index: 3; */ background-color: red; /* transform: scale3d(1,1,1); */ } .banner-box div:nth-child(4) {
      /* left: 150px; z-index: 2; */ background-color: black; /* transform: scale3d(1,.9,1); */ } .banner-box div:nth-child(5) {
      /* left: 200px; z-index: 1; */ background-color: gold; /* transform: scale3d(1,.8,1); */ } .banner-box span {
      width: 20px; height: 40px; line-height: 40px; position: absolute; top: 80px; font-size: 20px; background: rgba(0, 0, 0, 0.2); text-align: center; color: #fff; z-index: 10; cursor: pointer; -webkit-user-select:none ; } .banner-box .left {
      left: 0; } .banner-box .right {
      right: 0; } </style>
</head>

<body>
	<div class="banner-box" id="banner-box">
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<div></div>
		<span class="left"> &lt;</span>
		<span class="right"> &gt; </span>
	</div>
	<script type="text/javascript"> var list = [ "left: 0px; z-index: 1; transform: scale3d(1,.8,1);", "left: 50px; z-index: 2; transform: scale3d(1,.9,1);", "left: 100px; z-index: 3; transform: scale3d(1,1,1);", "left: 150px; z-index: 2; transform: scale3d(1,.9,1);", "left: 200px; z-index: 1; transform: scale3d(1,.8,1);" ]; var divList = document.querySelectorAll(".banner-box>div"); function setListPop() {
      // 弹出数组最后一个值，从头进入 var item = list.pop(); list.unshift(item); } function setListShift() {
      // 弹出数组第一个值，从进入 var item = list.shift(); list.push(item); } function setStyle() {
      for (let i = 0; i < divList.length; i++) {
      divList[i].style = list[i]; } } setStyle(); var bannerBox = document.getElementById("banner-box"); var stop = false; // 定时器 var timer = setInterval(function () {
      if (stop) {
      return; } setListShift(); setStyle(); }, 2000) // 鼠标悬停 bannerBox.onmouseenter = function () {
      stop = true; } bannerBox.onmouseleave = function () {
      stop = false; } // 添加单个div点击事件 for (let i = 0; i < divList.length; i++) {
      divList[i].onclick = function (event) {
      console.log(event) let e = event.target; let left = parseFloat(e.style.left); let len = 0; switch (left) {
      case 0: len = 3; break; case 50: len = 4; break; case 150: len = 1; break; case 200: len = 2; break; } for (let x = 0; x < len; x++) {
      setListPop(); } setStyle(); } } // 两侧点击 document.querySelector("#banner-box .left").onclick = function () {
      setListPop(); setStyle(); }; document.querySelector("#banner-box .right").onclick = function () {
      setListShift(); setStyle(); }; </script>
</body>

</html>