原生js实现3D轮播图

版权声明:转载声明原作者及链接 https://blog.csdn.net/ICY___/article/details/86685345

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.onmouseenter=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.onmouseleave=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].onclick=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].onclick=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].onclick=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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转载自blog.csdn.net/ICY___/article/details/86685345