JavaScript实现的3D旋转魔方动画效果实例代码

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JS1K是JavaScript编程竞赛——参加竞赛的规则很简单，脚本必须小于1K，竞赛网站开始也只是为了娱乐，却意外地收到了很多优秀的作品。

这是2016年JS1k上传的作品，用几十行代码实现的一个3D旋转魔方：

代码如下：

function z(t, e) {
  return t? e? t.appendChild(e) : "width:"+t+"px;height:"+t+"
px;position:absolute;" : document.createElement("div")
}

function w() {
  ++t==360&&(t=0, x=++x%3)
  for (i in m) 2 == m[i][s[x]] ? m[i][u][a] = r+s[x]+"(" + t + "deg)" : 0;
  c[u][a] = r+"3d(1,1,1," + t + "deg)", 
	requestAnimationFrame(w)
}
var a = "transform",
	p = "background-color:",
	y = a+"-style:preserve-3d;",
  u = "style",
  v = "cssText",
  B = z(),
  c = z(),
  t = x = 0,
  d, e, f, g, h, k, l, m = [], n, i, r="rotate", s = ["X","Y","Z"];

B[u][v] = "perspective:900px;"+z(600)+p+"#666";
c[u][v] = y + z(240) +"top:30%;left:30%", z(B, c), z(window.b, B);

for (l = 27; l--; z(c, f)) {
  f = z(), 
  f[u][v] = y + z(240), 
  f.X = g = l % 3, 
  f.Y = h = (l - g) % 9 / 3, 
  f.Z = k = ~~(l / 9), e = z(), 
  e[u][v] = y + z(80) +a+":translate3d(" + 80 * g + "px," + 
80 * h + "px," + 80 * (k-1) + "px)";
  for (n = 6; n--; z(e, d)) 
  	d = z(), 
  	d[u][v] = y + z(72) + "border-radius:9px;border:4px solid
 #000;opacity:0.9;"+a+":"+r+"X(" + (4 > n ? 90 * n : 0) 
 + "deg)"+r+"Y(" + (4 > n ? 0 : 4 == n ? -90 : 90) + "deg)translateZ(40px);"+p+ 
  	(0==n&&2==k?"#05C":1==n&&0==h?"#FD0":
 2==n&&0==k?"#0A6":3==n&&2==h?"#FFF":4==n&&0==g?"#F60":5==n&&2==g?"#C24":"#000");
  z(f, e), m.push(f)
}

w();

知识点扩展

JS如何实现旋转的魔方，浏览器从其他标签页回来依然匀速旋转？

<!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>Document</title>
</head>

<body>
  <div class="cube" onclick="stop()">
    <div class="front">front</div>
    <div class="back">back</div>
    <div class="left">left</div>
    <div class="right">right</div>
    <div class="top">top</div>
    <div class="bottom">bottom</div>
  </div>
</body>
<style>
  .cube {
    width: 400px;
    height: 400px;
    transition: all 3s;
    margin: 300px auto;
    /* 作用于所有3d转换的子元素 设置给父级 */
    /* perspective: 1000px; */
    /* transform: rotateX(30deg) rotateY(45deg); */
    /* 平面到立方 默认值:平面flat*/
    transform-style: preserve-3d;

    position: relative;
  }

  /* div:hover {
    transform: rotateY(90deg) translateZ(-200px);
    opacity: 0.5;
  } */
  .front,
  .back,
  .left,
  .right,
  .top,
  .bottom {
    width: 100%;
    height: 100%;
    text-align: center;
    line-height: 400px;
    position: absolute;
    opacity: 0.9;
    left: 0;
    top: 0;
  }

  .front {
    background-color: palevioletred;
    background-image: url('http://img1.gtimg.com/tj/pics/hv1/117/208/2153/140051982.jpg');
    transform: translateZ(200px);
  }

  .back {
    background-color: yellow;
    transform: translateZ(-200px);
    background-image: url('https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=841408372,3004217725&fm=11&gp=0.jpg');
  }

  .left {
    background-color: pink;
    background-image: url('https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=2388632836,3966607624&fm=26&gp=0.jpg');
    transform: rotateY(90deg) translateZ(-200px)
  }

  .right {
    background-color: yellowgreen;
    background-image: url('https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=192610795,467565159&fm=26&gp=0.jpg');
    transform: rotateY(90deg) translateZ(200px)
  }

  .top {
    background-color: skyblue;
    background-image: url("https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=2936477803,4198185787&fm=15&gp=0.jpg");
    transform: rotateX(90deg) translateZ(200px)
  }

  .bottom {
    background-color: orange;
    background-image: url('http://img0.pclady.com.cn/pclady/1611/02/1612285_jyz.jpg');
    transform: rotateX(90deg) translateZ(-200px)
  }
</style>
<script>
  window.onload = function () {
    let cube = document.querySelector('.cube')
    let timer = null
    let x = 0; y = 0;
    function rotate() {
      cube.style.transform = 'rotateX(' + x + 'deg)' + '' + 'rotateY(' + y + 'deg)';
      x += 30
      y += 45
    }
    function stop() {
      clearInterval(timer)
    }
    clearInterval(timer);
    timer = setInterval(() => {
      rotate();
    }, 1000);
    // 监听是否在当前页，并置为已读
    // document.addEventListener("visibilitychange", function () {
    //   if (document.hidden) {  //不处于当前页面
    //     // do something
    //     clearInterval(timer)
    //   } else {
    //     timer;
    //   }
    // });

    var hiddenProperty = 'hidden' in document ? 'hidden' :
      'webkitHidden' in document ? 'webkitHidden' :
        'mozHidden' in document ? 'mozHidden' :
          null;
    var visibilityChangeEvent = hiddenProperty.replace(/hidden/i, 'visibilitychange');
    var onVisibilityChange = function () {
      if (!document[hiddenProperty]) {
        timer = setInterval(() => {
          rotate();
        }, 1000);
        console.log(hiddenProperty);
      } else {
        clearInterval(timer)
      }
    }
    document.addEventListener(visibilityChangeEvent, onVisibilityChange);
    // document.addEventListener("visibilitychange", function () {
    //   if (!document.hidden) {  //处于当前页面
    //     timer = setInterval(() => {
    //       rotate();
    //     }, 1000);
    //     console.log('active');
    //   } else {
    //     clearInterval(timer);
    //     console.log('hidden');
    //   }
    // });
  }
</script>

</html>

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