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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