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<!DOCTYPE html>
<html>
<head>
<meta charset=’utf-8′>
<title>虫洞</title>
<script>
!function (E) {
z = 0;
E.prototype.css = function () {
if (arguments.length == 1) {
if (typeof arguments[0] == ‘string’) return this.style[arguments[0]];
if (typeof arguments[0] == ‘object’) {
for (i in arguments[0]) {
this.style[i] = arguments[0][i]
}
return this
}
} else if (arguments.length == 2) {
this.style[arguments[0]] = arguments[1];
return this;
}
}
E.prototype.attr = function () {
if (arguments.length == 1) {
if (typeof arguments[0] == ‘string’) return this.getAttribute(arguments[0]);
if (typeof arguments[0] == ‘object’) {
for (i in arguments[0]) {
this.setAttribute(i, arguments[0][i])
}
return this;
}
} else if (arguments.length == 2) {
this.setAttribute(arguments[0], arguments[1]);
return this;
}
}
E.prototype.hasClass = function () {
return new RegExp(‘(^|\\s+)’ + arguments[0] + ‘(\\s+|$)’).test(this.attr(‘class’))
}
E.prototype.removeClass = function () {
if (!this.hasClass(arguments[0])) return this;
return this.attr(‘class’, this.attr(‘class’) ? this.attr(‘class’).replace(new RegExp(‘(^|\\s+)’ + arguments[0] + ‘(\\s+|$)’), ‘ ‘).replace(/(^\s*)|(\s*$)/g, “”) : ”)
}
E.prototype.addClass = function () {
if (this.hasClass(arguments[0])) return this;
return this.attr(‘class’, this.attr(‘class’) ? this.attr(‘class’).replace(/\s*$/, ‘ ‘ + arguments[0]).replace(/(^\s*)|(\s*$)/g, “”) : arguments[0])
}
E.prototype.toggleClass = function () {
return this.hasClass(arguments[0]) ? this.removeClass(arguments[0]) : this.addClass(arguments[0]);
}
E.prototype.appendTo = function () {
arguments[0].appendChild(this);
return this
}
E.prototype.append = function () {
this.appendChild(arguments[0]);
return this
}
E.prototype.on = function () {
var that = this;
var events = arguments[0].split(‘ ‘);
var handler = arguments[1];
events.forEach(function (event) {
that.addEventListener(event, handler);
});
return this;
}
E.prototype.html = function () {
if (arguments.length == 0) {
return this.innerHTML
} else if (arguments.length == 1) {
this.innerHTML = arguments[0];
return this;
}
}
E.prototype.click = function () {
var evt = document.createEvent(“HTMLEvents”);
evt.initEvent(“click”, false, false);
this.dispatchEvent(evt);
return this;
}
E.prototype.remove = function () {
this.parentElement.removeChild(this);
}
E.prototype.moveTo = function (pos, callback) {
var oThis = this.css(‘z-index’, z++);
clearInterval(this.timer);
this.timer = setInterval(doMove, 30);
function doMove() {
var bEnd = true,
cTop = parseInt(oThis.css(‘top’)),
cLeft = parseInt(oThis.css(‘left’));
var tSpeed = (pos.top – cTop) / 20,
lSpeed = (pos.left – cLeft) / 20;
tSpeed = tSpeed > 0 ? Math.ceil(tSpeed) : Math.floor(tSpeed);
lSpeed = lSpeed > 0 ? Math.ceil(lSpeed) : Math.floor(lSpeed);
pos.left == cLeft || (bEnd = false, oThis.css(‘left’, (parseInt(oThis.css(‘left’)) + lSpeed) + ‘px’));
if (bEnd) {
clearInterval(oThis.timer);
callback && callback();
}
}
return this;
}
E.prototype.fallDown = function (pos, speed, onMove, onStop) {
var oThis = this.css(‘z-index’, z++);
times = arguments.callee.times = arguments.callee.times || 0;
var cPos = pos.cPos;
var Gm = speed.v0 * speed.v0 * getR(pos, cPos);
clearInterval(this.timer);
this.timer = setInterval(doMove, 30);
function doMove() {
var r = getR(cPos, pos);
a = Gm / (r * r);
var g = {
v: a * (pos.top – cPos.top) / r,
h: a * (pos.left – cPos.left) / r
}
speed.v += g.v;
speed.h += g.h;
tPos = {
top: cPos.top + speed.v,
left: cPos.left + speed.h
}
if (getR(cPos, tPos) > getR(cPos, pos) / 8 || getR(cPos, pos) < 50) {
oThis.css({
top: pos.top + ‘px’,
left: pos.left + ‘px’
});
clearInterval(oThis.timer);
onStop && onStop();
return;
} else {
cPos = tPos;
oThis.css({
top: cPos.top + ‘px’,
left: cPos.left + ‘px’
});
}
// onMove && onMove(10);
times++;
// Gm ++;
}
}
getR = function (pos1, pos2) {
return Math.sqrt(Math.pow(pos1.top – pos2.top, 2) + Math.pow(pos1.left – pos2.left, 2));
}
}(window.Element);
</script>
</head>
<style>
.star {
position: fixed;
width: 10px;
height: 10px;
background: rgba(0, 0, 0, .5);
border-radius: 50%;
}
</style>
<body style=”overflow:hidden;position:fixed;top:0;left:0;bottom:0;right:0;”>
<div id=”wormhole” style=”position:fixed;width:100px;height:100px;background: #000;box-shadow: 1px 1px 50px 50px #000;border-radius:50%;”></div>
<script>
var stars = [],
len = /Mobile/.test(navigator.userAgent) ? 250 : 1000,
speed = 50,
w = document.documentElement.clientWidth,
h = document.documentElement.clientHeight;
wormhole.css({
top: h / 2 – 50 + ‘px’,
left: w / 2 – 50 + ‘px’
});
galaxy(len);
function galaxy(n) {
while (n– > 0) {
!function () {
var star = document.createElement(‘div’);
var tR = Math.random(),
lR = Math.random();
var cPos = { top: tR * h, left: lR * w }
var pos = { top: h / 2, left: w / 2, cPos: cPos };
var r = getR(cPos, pos);
var v0 = Math.sqrt(1 / r) * speed;
var hSpeed = ((pos.top – cPos.top) / r) * v0;
var vSpeed = (-(pos.left – cPos.left) / r) * v0;
stars.push(star);
star.no = stars.length – 1;
star.ghosts = [];
star.css({
top: cPos.top + ‘px’,
left: cPos.left + ‘px’
})
.addClass(‘star’)
.appendTo(document.body)
.fallDown(
pos,
{ h: hSpeed, v: vSpeed, v0: v0 },
function (x) {
var div = document.createElement(‘div’);
star.ghosts.push(div);
while (star.ghosts.length && star.ghosts.length > x) star.ghosts.shift().remove();
div.addClass(‘star’).attr(‘style’, star.attr(‘style’)).appendTo(document.body);
},
function () {
while (star.ghosts.length) star.ghosts.pop().remove();
stars.splice(star.no, 1);
star.remove();
galaxy(len – stars.length);
}
);
}()
}
}
</script>
</body>
</html>
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