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wd40

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清滑大学(清华大学)开源镜像愚人节彩蛋指南

// repository documentation

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# WD-40彩蛋（
每年4月1日 mirrors.tuna.tsinghua.edu.cn 都会有一个点击后元素浮动的彩蛋，  
并且会发一条这样的公告 https://mirrors.tuna.tsinghua.edu.cn/news/april-fool-wandering-mirrors/  
本仓库可以让你在你的网站实现同款效果  
依赖jQuery和matter.js，想必jquery你应该已经有了

只需要在页面的最后`</body>`前加入以下代码，即可实现这样的效果
```
<script src="//cdn.jsdelivr.net/npm/matter-js@0.19.0"></script>
<script>"use strict"; function findNearestBlock(e) { for (var t = !0; t;) { var r = e; if (t = !1, null === r || r === document.body) return null; var n = getComputedStyle(r); if ("svg" !== r.tagName && "inline" !== n.display) return r; e = r.parentNode, t = !0, n = undefined } } function bootstrap() { function e() { var e = 1e4, t = Matter.Bodies.rectangle(window.innerWidth / 2 + window.scrollX, -e / 2 + window.scrollY, window.innerWidth + 2 * e, e, { isStatic: !0, restitution: .8 }), r = Matter.Bodies.rectangle(window.innerWidth / 2 + window.scrollX, window.innerHeight + e / 2 + window.scrollY, window.innerWidth + 2 * e, e, { isStatic: !0, restitution: .8 }), n = Matter.Bodies.rectangle(-e / 2 + window.scrollX, window.innerHeight / 2 + window.scrollY, e, window.innerHeight + 2 * e, { isStatic: !0, restitution: .8 }), i = Matter.Bodies.rectangle(window.innerWidth + e / 2 + window.scrollX, window.innerHeight / 2 + window.scrollY, e, window.innerHeight + 2 * e, { isStatic: !0, restitution: .8 }); W && Matter.Composite.remove(engine.world, W), W = Matter.Composite.create(), Matter.Composite.add(W, [t, r, n, i]), Matter.Composite.add(engine.world, W) } function I(e) { var t = Math.min(e - q, 100); q = e; var r = window.scrollX, n = window.scrollY; if (k + 100 < e) { W && Matter.Composite.translate(W, { x: r - V, y: n - N }), V = r, N = n; var i = window.screenX - R, o = window.screenY - T, a = !0, l = !1, d = undefined; try { for (var s, w = engine.world.bodies[Symbol.iterator](); !(a = (s = w.next()).done); a = !0) { (m = s.value) !== W && Matter.Body.translate(m, { x: -i, y: -o }) } } catch (H) { l = !0, d = H } finally { try { !a && w["return"] && w["return"]() } finally { if (l) throw d } } R = window.screenX, T = window.screenY } Matter.Engine.update(engine, t); var c = Matter.Composite.allBodies(engine.world), u = !0, f = !1, y = undefined; try { for (var v, g = c[Symbol.iterator](); !(u = (v = g.next()).done); u = !0) { var m, p = (m = v.value).id, h = P.get(p); if (h) { var M = _slicedToArray(h, 3), x = M[0], b = M[1], S = M[2]; if (x && x.offsetParent) { var B = x.offsetParent.getBoundingClientRect(), C = B.top, X = B.left + x.offsetLeft + b / 2, Y = C + x.offsetTop + S / 2, A = m.position.x - r, E = m.position.y - n, L = m.angle; x.style.transform = "translate(" + (A - X) + "px, " + (E - Y) + "px) rotate(" + L + "rad)" } else P["delete"](p), Matter.Composite.remove(engine.world, m) } } } catch (H) { f = !0, y = H } finally { try { !u && g["return"] && g["return"]() } finally { if (f) throw y } } requestAnimationFrame(I) } engine = Matter.Engine.create({ gravity: { x: 0, y: -.1 } }); var P = new Map, W = null; e(), window.addEventListener("resize", e); var t = document.createElement("div"); t.style.position = "fixed", t.style.left = 0, t.style.top = 0, t.style.width = "100vw", t.style.height = "100vh", t.style["pointer-events"] = "none", document.body.appendChild(t); var q = performance.now(), V = window.scrollX, N = window.scrollY, R = window.screenX, T = window.screenY, k = q; requestAnimationFrame(I), document.body.addEventListener("click", function (e) { var t = findNearestBlock(e.target); if (t.classList.contains("meow-floating")) return !0; if (t.querySelector(".meow-floating")) return !0; e.preventDefault(), e.stopImmediatePropagation(); var r = t.getBoundingClientRect(), n = r.top, i = r.left, o = r.width, a = r.height; if (600 < a) return !0; var l = window.scrollX + i, d = window.scrollY + n, s = Matter.Bodies.rectangle(l + o / 2, d + a / 2, o, a, { restitution: .8 }), w = s.id, c = 2 * Math.random() - 1, u = 2 * Math.random() - 1, f = .02 * Math.random() - .01; Matter.Body.setVelocity(s, { x: c, y: u }), Matter.Body.setAngularVelocity(s, f), t.style.setProperty("--real-width", o + "px"), t.style.setProperty("--real-height", a + "px"), t.classList.add("meow-floating"); var y = t.querySelectorAll("a[data-toggle=popover]"), v = !0, g = !1, m = undefined; try { for (var p, h = y[Symbol.iterator](); !(v = (p = h.next()).done); v = !0) { p.value.addEventListener("mouseover", function (e) { e.stopImmediatePropagation() }, !0) } } catch (X) { g = !0, m = X } finally { try { !v && h["return"] && h["return"]() } finally { if (g) throw m } } var M = t.querySelectorAll(".popover"), x = !0, b = !1, S = undefined; try { for (var B, C = M[Symbol.iterator](); !(x = (B = C.next()).done); x = !0) { B.value.remove() } } catch (X) { b = !0, S = X } finally { try { !x && C["return"] && C["return"]() } finally { if (b) throw S } } return P.set(w, [t, o, a]), Matter.Composite.add(engine.world, s), !1 }, !0) } var _slicedToArray = function () { function r(e, t) { var r = [], n = !0, i = !1, o = undefined; try { for (var a, l = e[Symbol.iterator](); !(n = (a = l.next()).done) && (r.push(a.value), !t || r.length !== t); n = !0); } catch (d) { i = !0, o = d } finally { try { !n && l["return"] && l["return"]() } finally { if (i) throw o } } return r } return function (e, t) { if (Array.isArray(e)) return e; if (Symbol.iterator in Object(e)) return r(e, t); throw new TypeError("Invalid attempt to destructure non-iterable instance") } }(), Matter = window.Matter, engine = null; window.addEventListener("devicemotion", function (e) { if (engine) { if (e.accelerationIncludingGravity) { var t = e.accelerationIncludingGravity.x, r = e.accelerationIncludingGravity.y; if (null === t || null === r) return; var n = Matter.Vector.create(2e-4 * t, 2e-4 * -r), i = Matter.Vector.magnitude(n), o = Matter.Vector.normalise(n); engine.gravity.x = o.x, engine.gravity.y = o.y, engine.gravity.scale = i } if (e.rotationRate) { var a = e.rotationRate.gamma; if (null === a) return; var l = window.innerWidth / 2 + window.scrollX, d = window.innerHeight / 2 + window.scrollY, s = !0, w = !1, c = undefined; try { for (var u, f = engine.world.bodies[Symbol.iterator](); !(s = (u = f.next()).done); s = !0) { var y = u.value; Matter.Body.rotate(y, 2e-4 * a, { x: l, y: d }) } } catch (v) { w = !0, c = v } finally { try { !s && f["return"] && f["return"]() } finally { if (w) throw c } } } } }), document.body.onload = bootstrap;</script>
```

如果你的网站使用php，那么只需要在最后`</body>`前加入以下代码，即可在每年的每年4月1日加载这个彩蛋
```
<?php if (date('md')=='0401'): ?>
<script src="//cdn.jsdelivr.net/npm/matter-js@0.19.0"></script>
<script>"use strict"; function findNearestBlock(e) { for (var t = !0; t;) { var r = e; if (t = !1, null === r || r === document.body) return null; var n = getComputedStyle(r); if ("svg" !== r.tagName && "inline" !== n.display) return r; e = r.parentNode, t = !0, n = undefined } } function bootstrap() { function e() { var e = 1e4, t = Matter.Bodies.rectangle(window.innerWidth / 2 + window.scrollX, -e / 2 + window.scrollY, window.innerWidth + 2 * e, e, { isStatic: !0, restitution: .8 }), r = Matter.Bodies.rectangle(window.innerWidth / 2 + window.scrollX, window.innerHeight + e / 2 + window.scrollY, window.innerWidth + 2 * e, e, { isStatic: !0, restitution: .8 }), n = Matter.Bodies.rectangle(-e / 2 + window.scrollX, window.innerHeight / 2 + window.scrollY, e, window.innerHeight + 2 * e, { isStatic: !0, restitution: .8 }), i = Matter.Bodies.rectangle(window.innerWidth + e / 2 + window.scrollX, window.innerHeight / 2 + window.scrollY, e, window.innerHeight + 2 * e, { isStatic: !0, restitution: .8 }); W && Matter.Composite.remove(engine.world, W), W = Matter.Composite.create(), Matter.Composite.add(W, [t, r, n, i]), Matter.Composite.add(engine.world, W) } function I(e) { var t = Math.min(e - q, 100); q = e; var r = window.scrollX, n = window.scrollY; if (k + 100 < e) { W && Matter.Composite.translate(W, { x: r - V, y: n - N }), V = r, N = n; var i = window.screenX - R, o = window.screenY - T, a = !0, l = !1, d = undefined; try { for (var s, w = engine.world.bodies[Symbol.iterator](); !(a = (s = w.next()).done); a = !0) { (m = s.value) !== W && Matter.Body.translate(m, { x: -i, y: -o }) } } catch (H) { l = !0, d = H } finally { try { !a && w["return"] && w["return"]() } finally { if (l) throw d } } R = window.screenX, T = window.screenY } Matter.Engine.update(engine, t); var c = Matter.Composite.allBodies(engine.world), u = !0, f = !1, y = undefined; try { for (var v, g = c[Symbol.iterator](); !(u = (v = g.next()).done); u = !0) { var m, p = (m = v.value).id, h = P.get(p); if (h) { var M = _slicedToArray(h, 3), x = M[0], b = M[1], S = M[2]; if (x && x.offsetParent) { var B = x.offsetParent.getBoundingClientRect(), C = B.top, X = B.left + x.offsetLeft + b / 2, Y = C + x.offsetTop + S / 2, A = m.position.x - r, E = m.position.y - n, L = m.angle; x.style.transform = "translate(" + (A - X) + "px, " + (E - Y) + "px) rotate(" + L + "rad)" } else P["delete"](p), Matter.Composite.remove(engine.world, m) } } } catch (H) { f = !0, y = H } finally { try { !u && g["return"] && g["return"]() } finally { if (f) throw y } } requestAnimationFrame(I) } engine = Matter.Engine.create({ gravity: { x: 0, y: -.1 } }); var P = new Map, W = null; e(), window.addEventListener("resize", e); var t = document.createElement("div"); t.style.position = "fixed", t.style.left = 0, t.style.top = 0, t.style.width = "100vw", t.style.height = "100vh", t.style["pointer-events"] = "none", document.body.appendChild(t); var q = performance.now(), V = window.scrollX, N = window.scrollY, R = window.screenX, T = window.screenY, k = q; requestAnimationFrame(I), document.body.addEventListener("click", function (e) { var t = findNearestBlock(e.target); if (t.classList.contains("meow-floating")) return !0; if (t.querySelector(".meow-floating")) return !0; e.preventDefault(), e.stopImmediatePropagation(); var r = t.getBoundingClientRect(), n = r.top, i = r.left, o = r.width, a = r.height; if (600 < a) return !0; var l = window.scrollX + i, d = window.scrollY + n, s = Matter.Bodies.rectangle(l + o / 2, d + a / 2, o, a, { restitution: .8 }), w = s.id, c = 2 * Math.random() - 1, u = 2 * Math.random() - 1, f = .02 * Math.random() - .01; Matter.Body.setVelocity(s, { x: c, y: u }), Matter.Body.setAngularVelocity(s, f), t.style.setProperty("--real-width", o + "px"), t.style.setProperty("--real-height", a + "px"), t.classList.add("meow-floating"); var y = t.querySelectorAll("a[data-toggle=popover]"), v = !0, g = !1, m = undefined; try { for (var p, h = y[Symbol.iterator](); !(v = (p = h.next()).done); v = !0) { p.value.addEventListener("mouseover", function (e) { e.stopImmediatePropagation() }, !0) } } catch (X) { g = !0, m = X } finally { try { !v && h["return"] && h["return"]() } finally { if (g) throw m } } var M = t.querySelectorAll(".popover"), x = !0, b = !1, S = undefined; try { for (var B, C = M[Symbol.iterator](); !(x = (B = C.next()).done); x = !0) { B.value.remove() } } catch (X) { b = !0, S = X } finally { try { !x && C["return"] && C["return"]() } finally { if (b) throw S } } return P.set(w, [t, o, a]), Matter.Composite.add(engine.world, s), !1 }, !0) } var _slicedToArray = function () { function r(e, t) { var r = [], n = !0, i = !1, o = undefined; try { for (var a, l = e[Symbol.iterator](); !(n = (a = l.next()).done) && (r.push(a.value), !t || r.length !== t); n = !0); } catch (d) { i = !0, o = d } finally { try { !n && l["return"] && l["return"]() } finally { if (i) throw o } } return r } return function (e, t) { if (Array.isArray(e)) return e; if (Symbol.iterator in Object(e)) return r(e, t); throw new TypeError("Invalid attempt to destructure non-iterable instance") } }(), Matter = window.Matter, engine = null; window.addEventListener("devicemotion", function (e) { if (engine) { if (e.accelerationIncludingGravity) { var t = e.accelerationIncludingGravity.x, r = e.accelerationIncludingGravity.y; if (null === t || null === r) return; var n = Matter.Vector.create(2e-4 * t, 2e-4 * -r), i = Matter.Vector.magnitude(n), o = Matter.Vector.normalise(n); engine.gravity.x = o.x, engine.gravity.y = o.y, engine.gravity.scale = i } if (e.rotationRate) { var a = e.rotationRate.gamma; if (null === a) return; var l = window.innerWidth / 2 + window.scrollX, d = window.innerHeight / 2 + window.scrollY, s = !0, w = !1, c = undefined; try { for (var u, f = engine.world.bodies[Symbol.iterator](); !(s = (u = f.next()).done); s = !0) { var y = u.value; Matter.Body.rotate(y, 2e-4 * a, { x: l, y: d }) } } catch (v) { w = !0, c = v } finally { try { !s && f["return"] && f["return"]() } finally { if (w) throw c } } } } }), document.body.onload = bootstrap;</script>
<?php endif; ?>
```

wd40

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