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原生js实现3D轮播图

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3D轮播图是我做过复杂的图片轮播了,由于是利用坐标,层级之间的关系,所以实现起来原理比较简单但是bug巨多,在推推拖拖了好久后,下定决心重新整理成博客,与大家分享!

首先分析一下3D图片轮播的功能需求:

和其它图片轮播大体一致,无非就是点击按钮向左、右翻页,点击下方提示位置小点切换到小点表示对的位置页(我是真的不知道那个小点叫什么名字,大家将就着听吧)

上代码:

基本代码:

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <meta http-equiv="X-UA-Compatible" content="ie=edge">
 <title>立体轮播图</title>
 <style>
 .block{
 position: relative;
 width: 900px;
 height: 370px;
 margin: 0 auto;
 overflow: hidden;
 }
 .imgae_div{
 position: relative;
 width: 900px;
 height: 300px;
 }
 .imgae_div>div{
 position: absolute;
 width: 400px;
 height: 200px;
 transition: all 1s linear;
 
 }
 .imgae_div img{
 width: 400px;
 height: 200px;
 }
 .imgae_div>div:nth-child(1){
 top: 150px;
 left: 250px;
 z-index: 6;
 }
 .imgae_div>div:nth-child(2){
 top: 100px;
 left: 0px;
 z-index: 5;
 }
 .imgae_div>div:nth-child(3){
 top: 50px;
 left: 0px;
 z-index: 4;
 }
 .imgae_div>div:nth-child(4){
 top: 0px;
 left: 250px;
 z-index: 3;
 }
 .imgae_div>div:nth-child(5){
 top: 50px;
 left: 500px;
 z-index: 4;
 }
 .imgae_div>div:nth-child(6){
 top: 100px;
 left: 500px;
 z-index: 5;
 }
 .btn{
 width: 900px;
 height: 40px;
 position: absolute;
 top: 155px;
 z-index: 999;
 overflow: hidden;
 }
 .btn>span:nth-child(1){
 width: 30px;
 background-color: rgba(164, 150, 243, 0.336);
 display: block;
 float: left;
 text-align: center;
 line-height: 40px;
 margin-left: -30px;
 cursor: pointer;
 opacity: 0;
 transition: all 0.5s linear;
 }
 .btn>span:nth-child(2){
 width: 30px;
 background-color: rgba(164, 150, 243, 0.336);
 display: block;
 float: right;
 text-align: center;
 line-height: 40px;
 margin-right: -30px;
 cursor: pointer;
 opacity: 0;
 transition: all 0.5s linear;
 }
 .marright{
 margin-right: 0px !important;
 opacity: 1 !important;
 }
 .marleft{
 margin-left: 0px !important;
 opacity: 1 !important;
 }
 .point{
 width: 108px;
 height: 14px;
 position: absolute;
 bottom: 0;
 left: 396px;
 z-index: 10;
 
 }
 .point>div{
 width: 14px;
 height: 14px;
 border-radius: 50%;
 background-color: white;
 float: left;
 margin: 0 2px;
 border: 2px solid black;
 box-sizing: border-box;
 }
 </style>
</head>
<body>
 <div class="block">
 <div class="imgae_div">
 <div><img src="./img/111.jpg" alt=""></div>
 <div><img src="./img/222.jpg" alt=""></div>
 <div><img src="./img/333.jpg" alt=""></div>
 <div><img src="./img/444.jpg" alt=""></div>
 <div><img src="./img/555.jpg" alt=""></div>
 <div><img src="./img/666.jpg" alt=""></div>
 </div>
 <div class="btn">
 <span><</span>
 <span>></span>
 </div>
 <div class="point">
 <div></div>
 <div></div>
 <div></div>
 <div></div>
 <div></div>
 <div></div>
 </div>
 </div>
 <script src="./js/index.js"></script>
</body>
</html>

js代码:

// 简单说一下我是怎么想的:1.分步实现,先实现图片自己动,在加其它的功能
// 2.每实现一个功能要立马去测bug,因为放到后面就越难找了。
// 3.轮播向左,向右是两个互相联系的方法,需要找到彼此的关系
var imgae_div = document.getElementsByClassName('imgae_div')[0];
var imgae_div_child = imgae_div.children;
var btn=document.getElementsByClassName('btn')[0];
var block=document.getElementsByClassName('block')[0];
var new_point = document.getElementsByClassName("point")[0].children;
new_point[0].style.backgroundColor = "#000000";
// 利用函数的封装 ps:图片轮播离不开计时器,且个人觉得用setIntervar比较多
img_work();
function img_work() {
 time = setInterval(function () {
 img_workfirst('left', 0);//两个参数,判断向左还是向右轮播,索引
 }, 1500);
}
// console.log(point.child);
function img_workfirst(left_right, cindex) {
 // 这里面首先说一下css中写好的默认层关系:从第1张到第6张为别为 6 5 4 3 4 5,和页面的布局有关
 var firstpage = {//当前页的各种属性
 // getComputedStyle()获取css属性
 left: window.getComputedStyle(imgae_div_child[cindex]).left,
 top: window.getComputedStyle(imgae_div_child[cindex]).top,
 zIndex: window.getComputedStyle(imgae_div_child[cindex]).zIndex,
 backcolor: window.getComputedStyle(new_point[cindex]).backgroundColor
 };
 if (left_right == 'left') {
 // 向左轮播为默认轮播
 for (var i = 0; i < imgae_div_child.length; i++) {
 // for循环遍历所有元素
 if (i == imgae_div_child.length - 1) {
 // 当前页的下一张为 最后一张(位置都是动态切换的)
 imgae_div_child[i].style.left = firstpage.left;
 imgae_div_child[i].style.top = firstpage.top;
 imgae_div_child[i].style.zIndex = firstpage.zIndex;
 new_point[i].style.backgroundColor = firstpage.backcolor;
 } 
 else {
 // 其它页对应为它前面元素的属性
 imgae_div_child[i].style.left = window.getComputedStyle(imgae_div_child[i + 1]).left;
 imgae_div_child[i].style.top = window.getComputedStyle(imgae_div_child[i + 1]).top;
 imgae_div_child[i].style.zIndex = window.getComputedStyle(imgae_div_child[i + 1]).zIndex;
 new_point[i].style.backgroundColor = window.getComputedStyle(new_point[i + 1]).backgroundColor;
 
 }
 }
 }
 // 向右轮播,借助向左轮播分析
 else {
 for (var i = imgae_div_child.length - 1; i >= 0; i--) {
 if (i == 0) {
 imgae_div_child[i].style.left = firstpage.left;
 imgae_div_child[i].style.top = firstpage.top;
 imgae_div_child[i].style.zIndex = firstpage.zIndex;
 new_point[i].style.backgroundColor = firstpage.backcolor;
 
 }
 else {
 imgae_div_child[i].style.left = window.getComputedStyle(imgae_div_child[i - 1]).left;
 imgae_div_child[i].style.top = window.getComputedStyle(imgae_div_child[i - 1]).top;
 imgae_div_child[i].style.zIndex = window.getComputedStyle(imgae_div_child[i - 1]).zIndex;
 new_point[i].style.backgroundColor = window.getComputedStyle(new_point[i - 1]).backgroundColor;
 
 
 }
 }
 }
 firstpage = null;
 // 将表示当前页的数据清空,防止bug(因为当前页也是动态变化的,需要动态创建)
}
// console.log(new_point);
 
// 消除一些bug
window.onblur = function () {//窗口失焦时,计时器停止
 clearInterval(time);
}
window.onfocus = function () {
 img_work();//获焦时开启计时器
}
document.onselectstart = function () {//禁止用户复制
 return false;
}
block.οnmοuseenter=function(){//鼠标进入轮播图时,两个按钮滑动出来
 clearInterval(time);
 btn.children[1].className='marright';
 btn.children[0].className='marleft';
}
block.οnmοuseleave=function(){//离开时和平时隐藏
 img_work();
 btn.children[1].className='';
 btn.children[0].className='';
 for (var k = 0; k < imgae_div_child.length; k++) {
 imgae_div_child[k].style.transitionDuration = "0.5s";
 }
}
// 对应的左右按钮的点击事件
btn.children[0].οnclick=function(event){
 if(event.detail==1){//用于控制鼠标的连击,但是效果对于故意测试来说还是有所缺陷 下同
 img_workfirst('left',0);
 }
}
btn.children[1].οnclick=function(event){
 if(event.detail==1){
 img_workfirst('right',imgae_div_child.length-1);
 }
}
 
 
// point的事件
for(var i=0;i<new_point.length;i++){
 new_point[i].index=i;
 new_point[i].οnclick=function(){
 for(var k=0;k<imgae_div_child.length;k++){
 imgae_div_child[k].style.transitionDuration='0.1s';//动画完成
 } 
 var oldindex=0;
 for(var k=0;k<new_point.length;k++){
 if(new_point[k].style.backgroundColor== 'rgb(0, 0, 0)'){//格式必须统一
 oldindex=new_point[k].index;
 }
 }
 var num =0;//判断计算转动次数
 if(this.index>oldindex){//所需页在当前页的左(左右相对于下方点来说)
 num=this.index-oldindex;
 var timego=setInterval(function(){
 num--;
 if(num<0){
 clearInterval(timego);
 }
 else{
 img_workfirst('right',5)//因为方向变了,所以下一页就为当前页的上一页,也就是cindex为5
 }
 },100);//动画时间缩短,优化体验
 }
 else{//所需页在当前页的左(左右相对于下方点来说)
 num=Math.abs(this.index-oldindex);
 var timego=setInterval(function(){
 num--;
 if(num<0){
 clearInterval(timego);
 }
 else{
 img_workfirst('left',0)
 }
 },100);
 }
}
}

关于出现的bug的一些总结:

1、注意左右的区分与联系
2、注意连续点击的bug
3、注意切换窗口,切换页面,最小化等这些切换的bug
4、注意代码格式,在js中写css样式时,要注意格式

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