html5跟随鼠标炫酷动画欢迎页hovertreewelcome

 var Stats = function() { var e = Date.now(), t = e, i = 0, n = 1 / 0, r = 0, s = 0, o = 1 / 0, a = 0, l = 0, h = 0, c = document.createElement("div"); c.id = "stats", c.addEventListener("mousedown", function(e) { e.preventDefault(), v(++h % 2) }, !1), c.style.cssText = "width:80px;opacity:0.9;cursor:pointer"; var u = document.createElement("div"); u.id = "fps", u.style.cssText = "padding:0 0 3px 3px;text-align:left;background-color:#002", c.appendChild(u); var d = document.createElement("div"); d.id = "fpsText", d.style.cssText = "color:#0ff;font-family:Helvetica,Arial,sans-serif;font-size:9px;font-weight:bold;line-height:15px", d.innerHTML = "FPS", u.appendChild(d); var p = document.createElement("div"); for (p.id = "fpsGraph", p.style.cssText = "position:relative;width:74px;height:30px;background-color:#0ff", u.appendChild( p); 74 > p.children.length;) { var f = document.createElement("span"); f.style.cssText = "width:1px;height:30px;float:left;background-color:#113", p.appendChild(f) } var m = document.createElement("div"); m.id = "ms", m.style.cssText = "padding:0 0 3px 3px;text-align:left;background-color:#020;display:none", c.appendChild( m); var g = document.createElement("div"); g.id = "msText", g.style.cssText = "color:#0f0;font-family:Helvetica,Arial,sans-serif;font-size:9px;font-weight:bold;line-height:15px", g.innerHTML = "MS", m.appendChild(g); var y = document.createElement("div"); for (y.id = "msGraph", y.style.cssText = "position:relative;width:74px;height:30px;background-color:#0f0", m.appendChild( y); 74 > y.children.length;) { var f = document.createElement("span"); f.style.cssText = "width:1px;height:30px;float:left;background-color:#131", y.appendChild(f) } var v = function(e) { switch (h = e) { case 0: u.style.display = "block", m.style.display = "none"; break; case 1: u.style.display = "none", m.style.display = "block" } }, b = function(e, t) { var i = e.appendChild(e.firstChild); i.style.height = t + "px" }; return { REVISION: 11, domElement: c, setMode: v, begin: function() { e = Date.now() }, end: function() { var h = Date.now(); return i = h - e, n = Math.min(n, i), r = Math.max(r, i), g.textContent = i + " MS (" + n + "-" + r + ")", b(y, Math.min(30, 30 - 30 * (i / 200))), l++, h > t + 1e3 && (s = Math.round(1e3 * l / (h - t)), o = Math.min(o, s), a = Math.max(a, s), d.textContent = s + " FPS (" + o + "-" + a + ")", b(p, Math.min(30, 30 - 30 * (s / 100))), t = h, l = 0), h }, update: function() { e = this.end() } } };