css3实现可拖动的魔方3d效果

<div class="container">
        <div class="box defaul">
            <div class="pic"><img src="./img/cat.jpg" alt=""></div>
            <div class="pic"><img src="./img/dog.jpg" alt=""></div>
            <div class="pic"><img src="./img/elephant.jpg" alt=""></div>
            <div class="pic"><img src="./img/lion.jpg" alt=""></div>
            <div class="pic"><img src="./img/rabbit.jpg" alt=""></div>
            <div class="pic"><img src="./img/monkey.jpg" alt=""></div>
        </div>
    </div>
    <h1>点击下面的图片按钮切换</h1>
    <div class="btn">
        <input type="image" class="1" src="./img/cat.jpg">
        <input type="image" class="2" src="./img/dog.jpg">
        <input type="image" class="3" src="./img/elephant.jpg">
        <input type="image" class="4" src="./img/lion.jpg">
        <input type="image" class="5" src="./img/rabbit.jpg">
        <input type="image" class="6" src="./img/monkey.jpg">
    </div>

   * {
        margin: 0;
        padding: 0;
    }
    html,
    body {
        width: 100%;
        height: 100%;
        background: #66677c;
        text-align: center;
    }
    .container {
        width: 300px;
        height: 300px;
        margin: 50px auto 150px;
        perspective: 1200px;
    }
    .container .box {
        width: 300px;
        height: 300px;
        position: relative;
        transform-style: preserve-3d;
        transition: transform 0.5s;
    }
    .container .box .pic {
        position: absolute;
        left: 0;
        top: 0;
        width: 300px;
        height: 300px;
        box-shadow: 0px 0px 5px #fff;
    }
    .container .box .pic img {
        width: 100%;
        height: 100%;
        cursor: pointer;
    }
    .container .box .pic:nth-child(1) {
        transform: translateZ(150px);
    }
    .container .box .pic:nth-child(2) {
        transform: rotateY(-180deg) translateZ(150px);
    }
    .container .box .pic:nth-child(3) {
        transform: rotateY(90deg) translateZ(150px);
    }
    .container .box .pic:nth-child(4) {
        transform: rotateY(-90deg) translateZ(150px);
    }
    .container .box .pic:nth-child(5) {
        transform: rotateX(90deg) translateZ(150px);
    }
    .container .box .pic:nth-child(6) {
        transform: rotateX(-90deg) translateZ(150px);
    }
    h1 {
        color: #fff;
        font-size: 30px;
        margin-bottom: 30px;
    }
    .btn {
        display: grid;
        justify-content: center;
        grid-template-columns: 100px 100px 100px;
        grid-template-rows: 100px 100px;
        grid-gap: 15px;
    }
    .btn input {
        width: 100px;
        height: 100px;
        outline: none;
        border: 2px solid #fff;
    }
    .btn input:focus {
        border: 2px solid #e70;
    }
    .defaul {
        transform: translateZ(-150px) rotateX(-10deg) rotateY(15deg);
    }
    .image1 {
        transform: translateZ(-150px) rotateX(0deg) rotateY(0deg);
    }
    .image2 {
        transform: translateZ(-150px) rotateY(-180deg);
    }
    .image3 {
        transform: translateZ(-150px) rotateY(-90deg);
    }
    .image4 {
        transform: translateZ(-150px) rotateY(90deg);
    }
    .image5 {
        transform: translateZ(-150px) rotateX(-90deg);
    }
    .image6 {
        transform: translateZ(-150px) rotateX(90deg);
    }

 (function(){
        var btn = document.getElementsByClassName('btn')[0];
        var box = document.getElementsByClassName('box')[0];
        btn.addEventListener('click',function(e){
            var className = e.target.className;
            if(className !== 'btn'){
                box.style = '';
                box.classList.replace(box.classList[1],'image'+className);
            }
        })
        //鼠标拖动效果
        var xN = 10, yN = 15;
        document.addEventListener('mousedown',function(e){
            e.preventDefault();
            e.stopPropagation();
            var x = e.clientX;
            var y = e.clientY;
            document.addEventListener('mousemove',move);
            document.addEventListener('mouseup', up);
            function move(e){
                e.preventDefault();
                e.stopPropagation();
                var x1 = e.clientX;
                var y1 = e.clientY;
                xN += (x1 - x)*0.04;
                yN += (y1 - y)*0.04;
                box.style.transform = 'translateZ(-150px) rotateY(' + xN + 'deg) rotateX(' + -yN + 'deg)';
            }
            function up(){
                document.removeEventListener('mousemove', move);
            }
        })
    })()