CSS3超酷粒子效果进度条js代码

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以下是 CSS3超酷粒子效果进度条js代码的示例演示效果:

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HTML代码(index.html):

<!DOCTYPE html>
<html>
<head>
  <meta charset="gb2312">
  <title>CSS3��������Ч��������</title>
  <style>
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed,
figure, figcaption, footer, header, hgroup,
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 100%;
  font: inherit;
  vertical-align: baseline;
}
/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure,
footer, header, hgroup, menu, nav, section {
  display: block;
}
body {
  line-height: 1;
}
ol, ul {
  list-style: none;
}
blockquote, q {
  quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
  content: '';
  content: none;
}
table {
  border-collapse: collapse;
  border-spacing: 0;
}
</style>

    <style>
body {
	background: #111;
}

canvas {
	background: #111;
	border: 1px solid #171717;
	display: block;
	left: 50%;
	margin: -51px 0 0 -201px;
	position: absolute;
	top: 50%;
}
</style>
</head>
<body>
<script src="js/index.js"></script>
</body>
</html>

JS代码(index.js):

/*========================================================*/
/* Light Loader/*========================================================*/
var lightLoader = function(c,cw,ch){
	var _this = this;
	this.c = c;
	this.ctx = c.getContext('2d');
	this.cw = cw;
	this.ch = ch;
	this.loaded = 0;
	this.loaderSpeed = .6;
	this.loaderHeight = 10;
	this.loaderWidth = 310;
	this.loader ={
	x:(this.cw/2) - (this.loaderWidth/2),y:(this.ch/2) - (this.loaderHeight/2)}
;
	this.particles = [];
	this.particleLift = 180;
	this.hueStart = 0this.hueEnd = 120;
	this.hue = 0;
	this.gravity = .15;
	this.particleRate = 4;
	/*========================================================*/
/* Initialize/*========================================================*/
this.init = function(){
	this.loop();
}
;
	/*========================================================*/
/* Utility Functions/*========================================================*/
this.rand = function(rMi,rMa){
	return ~~((Math.random()*(rMa-rMi+1))+rMi);
}
;
	this.hitTest = function(x1,y1,w1,h1,x2,y2,w2,h2){
	return !(x1 + w1 < x2 || x2 + w2 < x1 || y1 + h1 < y2 || y2 + h2 < y1);
}
;
	/*========================================================*/
/* Update Loader/*========================================================*/
this.updateLoader = function(){
	if(this.loaded < 100){
	this.loaded += this.loaderSpeed;
}
else{
	this.loaded = 0;
}
}
;
	/*========================================================*/
/* Render Loader/*========================================================*/
this.renderLoader = function(){
	this.ctx.fillStyle = '#000';
	this.ctx.fillRect(this.loader.x,this.loader.y,this.loaderWidth,this.loaderHeight);
	this.hue = this.hueStart + (this.loaded/100)*(this.hueEnd - this.hueStart);
	var newWidth = (this.loaded/100)*this.loaderWidth;
	this.ctx.fillStyle = 'hsla('+this.hue+',100%,40%,1)';
	this.ctx.fillRect(this.loader.x,this.loader.y,newWidth,this.loaderHeight);
	this.ctx.fillStyle = '#222';
	this.ctx.fillRect(this.loader.x,this.loader.y,newWidth,this.loaderHeight/2);
}
;
	/*========================================================*/
/* Particles/*========================================================*/
this.Particle = function(){
	this.x = _this.loader.x + ((_this.loaded/100)*_this.loaderWidth) - _this.rand(0,1);
	this.y = _this.ch/2 + _this.rand(0,_this.loaderHeight)-_this.loaderHeight/2;
	this.vx = (_this.rand(0,4)-2)/100;
	this.vy = (_this.rand(0,_this.particleLift)-_this.particleLift*2)/100;
	this.width = _this.rand(1,4)/2;
	this.height = _this.rand(1,4)/2;
	this.hue = _this.hue;
}
;
	this.Particle.prototype.update = function(i){
	this.vx += (_this.rand(0,6)-3)/100;
	this.vy += _this.gravity;
	this.x += this.vx;
	this.y += this.vy;
	if(this.y > _this.ch){
	_this.particles.splice(i,1);
}
}
;
	this.Particle.prototype.render = function(){
	_this.ctx.fillStyle = 'hsla('+this.hue+',100%,'+_this.rand(50,70)+'%,'+_this.rand(20,100)/100+')';
	_this.ctx.fillRect(this.x,this.y,this.width,this.height);
}
;
	this.createParticles = function(){
	var i = this.particleRate;
	while(i--){
	this.particles.push(new this.Particle());
}
;
}
;
	this.updateParticles = function(){
	var i = this.particles.length;
	while(i--){
	var p = this.particles[i];
	p.update(i);
}
;
}
;
	this.renderParticles = function(){
	var i = this.particles.length;
	while(i--){
	var p = this.particles[i];
	p.render();
}
;
}
;
	/*========================================================*/
/* Clear Canvas/*========================================================*/
this.clearCanvas = function(){
	this.ctx.globalCompositeOperation = 'source-over';
	this.ctx.clearRect(0,0,this.cw,this.ch);
	this.ctx.globalCompositeOperation = 'lighter';
}
;
	/*========================================================*/
/* Animation Loop/*========================================================*/
this.loop = function(){
	var loopIt = function(){
	requestAnimationFrame(loopIt,_this.c);
	_this.clearCanvas();
	_this.createParticles();
	_this.updateLoader();
	_this.updateParticles();
	_this.renderLoader();
	_this.renderParticles();
}
;
	loopIt();
}
;
}
;
	/*========================================================*/
/* Check Canvas Support/*========================================================*/
var isCanvasSupported = function(){
	var elem = document.createElement('canvas');
	return !!(elem.getContext && elem.getContext('2d'));
}
;
	/*========================================================*/
/* Setup requestAnimationFrame/*========================================================*/
var setupRAF = function(){
	var lastTime = 0;
	var vendors = ['ms','moz','webkit','o'];
	for(var x = 0;
	x < vendors.length && !window.requestAnimationFrame;
	++x){
	window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
	window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] || window[vendors[x]+'CancelRequestAnimationFrame'];
}
;
	if(!window.requestAnimationFrame){
	window.requestAnimationFrame = function(callback,element){
	var currTime = new Date().getTime();
	var timeToCall = Math.max(0,16 - (currTime - lastTime));
	var id = window.setTimeout(function(){
	callback(currTime + timeToCall);
}
,timeToCall);
	lastTime = currTime + timeToCall;
	return id;
}
;
}
;
	if (!window.cancelAnimationFrame){
	window.cancelAnimationFrame = function(id){
	clearTimeout(id);
}
;
}
;
}
;
	/*========================================================*/
/* Define Canvas and Initialize/*========================================================*/
if(isCanvasSupported){
	var c = document.createElement('canvas');
	c.width = 400;
	c.height = 100;
	var cw = c.width;
	var ch = c.height;
	document.body.appendChild(c);
	var cl = new lightLoader(c,cw,ch);
	setupRAF();
	cl.init();
}

CSS代码(style.css):

body{background:#111;}
canvas{background:#111;border:1px solid #171717;display:block;left:50%;margin:-51px 0 0 -201px;position:absolute;top:50%;}

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