jQuery动态随机背景滚动js代码

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以下是 jQuery动态随机背景滚动js代码的示例演示效果:

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部分效果截图:

HTML代码(index.html):

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jQuery动态随机背景滚动</title>
<link rel="stylesheet" type="text/css" media="screen" href="css/style.css" />
<script type="text/javascript" src="js/jquery-1.3.2.min.js"></script>
<script type="text/javascript" src="js/custom.js"></script>
<script type="text/javascript" src="js/pngFix.js"></script>
<script type="text/javascript">
  DD_belatedPNG.fix('.png-fix');
</script>
</head>
<body>
<div id="wrapper">
<h3>Example 1</h3>
<div id="container">
    <div id="overlay" class="png-fix">
         <div id="title">
              ooh,<br />pretty.
         </div>
    </div>
</div>
<p>Notice how the background slowly changes colour over time. Refresh the page a few times - you will see that the overlaid image moves around as well. This creates a unique effect on every page load, meaning that you will never have exactly the same design element twice. Leave us a comment to show how you have implemented this effect into your designs - we'd love to see how creative you have got!</p>
<br />
<h3>Example 2</h3>
<p>The below effect was achieved by adding a third div inside the 'id="overlay"' containing div. Giving it absolute positioning as well means you can then use a transparent png image in the foreground of this third div. Obviously, being transparent, you can see through certain areas of this .png and on to the background we have created. </p>
<br />
<a name="downloadit"></a>
<div id="container2">
    <div id="overlay2" class="png-fix">
         <div id="download">
           <a href="#" title="Download the .zip folder">
              <img src="images/example2.png" alt="Download it Image" class="png-fix" />
           </a>
         </div>
    </div>
</div>
<br />
<br />
<br />
Thanks for looking, have fun!
</div>
</body>
</html>

JS代码(custom.js):

 //##########################################################################//// Scrolling background Tutorial Code by http://www.kudoswebsolutions.com // Original Source code:http://youlove.us/ // Modified and extended by Kudos Web Solutions // copyright 2009 kudoswebsolutions.com //##########################################################################//$(function(){
	// Define the height of your two background images. //The image to scroll var backgroundheight = 2000;
	//The image to overlay var backgroundheight_two = 1000;
	// Create a random offset for both images' starting positions offset = Math.round(Math.floor(Math.random()* 2001));
	offset2 = Math.round(Math.floor(Math.random()* 1001));
	function scrollbackground(){
	//Ensure all bases are covered when defining the offset.offset = (offset < 1) ? offset + (backgroundheight - 1):offset - 1;
	// Put the background onto the required div and animate vertically$('#container').css("background-position","50% " + offset + "px");
	// Enable the function to loop when it reaches the end of the imagesetTimeout(function(){
	scrollbackground();
}
,100);
}
function scrollbackground2(){
	//Ensure all bases are covered when defining the offset.offset = (offset < 1) ? offset + (backgroundheight - 1):offset - 1;
	// Put the background onto the required div and animate vertically$('#container2').css("background-position","50% " + offset + "px");
	// Enable the function to loop when it reaches the end of the imagesetTimeout(function(){
	scrollbackground2();
}
,100);
}
// Initiate the scrollscrollbackground();
	scrollbackground2();
	// Use the offset defined earlier and apply it to the div.$('#overlay').css("background-position","50% " + offset2 + "px");
	$('#overlay2').css("background-position","50% " + offset2 + "px");
}
);

JS代码(pngFix.js):

/*** DD_belatedPNG:Adds IE6 support:PNG images for CSS background-image and HTML <IMG/>.* Author:Drew Diller* Email:drew.diller@gmail.com* URL:http://www.dillerdesign.com/experiment/DD_belatedPNG/* Version:0.0.8a* Licensed under the MIT License:http://dillerdesign.com/experiment/DD_belatedPNG/#license** Example usage:* DD_belatedPNG.fix('.png_bg');
	// argument is a CSS selector* DD_belatedPNG.fixPng( someNode );
	// argument is an HTMLDomElement**/
var DD_belatedPNG={
	ns:"DD_belatedPNG",imgSize:{
}
,delay:10,nodesFixed:0,createVmlNameSpace:function(){
	if(document.namespaces&&!document.namespaces[this.ns]){
	document.namespaces.add(this.ns,"urn:schemas-microsoft-com:vml")}
}
,createVmlStyleSheet:function(){
	var b,a;
	b=document.createElement("style");
	b.setAttribute("media","screen");
	document.documentElement.firstChild.insertBefore(b,document.documentElement.firstChild.firstChild);
	if(b.styleSheet){
	b=b.styleSheet;
	b.addRule(this.ns+"\\:*","{
	behavior:url(#default#VML)}
");
	b.addRule(this.ns+"\\:shape","position:absolute;
	");
	b.addRule("img."+this.ns+"_sizeFinder","behavior:none;
	border:none;
	position:absolute;
	z-index:-1;
	top:-10000px;
	visibility:hidden;
	");
	this.screenStyleSheet=b;
	a=document.createElement("style");
	a.setAttribute("media","print");
	document.documentElement.firstChild.insertBefore(a,document.documentElement.firstChild.firstChild);
	a=a.styleSheet;
	a.addRule(this.ns+"\\:*","{
	display:none !important;
}
");
	a.addRule("img."+this.ns+"_sizeFinder","{
	display:none !important;
}
")}
}
,readPropertyChange:function(){
	var b,c,a;
	b=event.srcElement;
	if(!b.vmlInitiated){
	return}
if(event.propertyName.search("background")!=-1||event.propertyName.search("border")!=-1){
	DD_belatedPNG.applyVML(b)}
if(event.propertyName=="style.display"){
	c=(b.currentStyle.display=="none")?"none":"block";
	for(a in b.vml){
	if(b.vml.hasOwnProperty(a)){
	b.vml[a].shape.style.display=c}
}
}
if(event.propertyName.search("filter")!=-1){
	DD_belatedPNG.vmlOpacity(b)}
}
,vmlOpacity:function(b){
	if(b.currentStyle.filter.search("lpha")!=-1){
	var a=b.currentStyle.filter;
	a=parseInt(a.substring(a.lastIndexOf("=")+1,a.lastIndexOf(")")),10)/100;
	b.vml.color.shape.style.filter=b.currentStyle.filter;
	b.vml.image.fill.opacity=a}
}
,handlePseudoHover:function(a){
	setTimeout(function(){
	DD_belatedPNG.applyVML(a)}
,1)}
,fix:function(a){
	if(this.screenStyleSheet){
	var c,b;
	c=a.split(",");
	for(b=0;
	b<c.length;
	b++){
	this.screenStyleSheet.addRule(c[b],"behavior:expression(DD_belatedPNG.fixPng(this))")}
}
}
,applyVML:function(a){
	a.runtimeStyle.cssText="";
	this.vmlFill(a);
	this.vmlOffsets(a);
	this.vmlOpacity(a);
	if(a.isImg){
	this.copyImageBorders(a)}
}
,attachHandlers:function(i){
	var d,c,g,e,b,f;
	d=this;
	c={
	resize:"vmlOffsets",move:"vmlOffsets"}
;
	if(i.nodeName=="A"){
	e={
	mouseleave:"handlePseudoHover",mouseenter:"handlePseudoHover",focus:"handlePseudoHover",blur:"handlePseudoHover"}
;
	for(b in e){
	if(e.hasOwnProperty(b)){
	c[b]=e[b]}
}
}
for(f in c){
	if(c.hasOwnProperty(f)){
	g=function(){
	d[c[f]](i)}
;
	i.attachEvent("on"+f,g)}
}
i.attachEvent("onpropertychange",this.readPropertyChange)}
,giveLayout:function(a){
	a.style.zoom=1;
	if(a.currentStyle.position=="static"){
	a.style.position="relative"}
}
,copyImageBorders:function(b){
	var c,a;
	c={
	borderStyle:true,borderWidth:true,borderColor:true}
;
	for(a in c){
	if(c.hasOwnProperty(a)){
	b.vml.color.shape.style[a]=b.currentStyle[a]}
}
}
,vmlFill:function(e){
	if(!e.currentStyle){
	return}
else{
	var d,f,g,b,a,c;
	d=e.currentStyle}
for(b in e.vml){
	if(e.vml.hasOwnProperty(b)){
	e.vml[b].shape.style.zIndex=d.zIndex}
}
e.runtimeStyle.backgroundColor="";
	e.runtimeStyle.backgroundImage="";
	f=true;
	if(d.backgroundImage!="none"||e.isImg){
	if(!e.isImg){
	e.vmlBg=d.backgroundImage;
	e.vmlBg=e.vmlBg.substr(5,e.vmlBg.lastIndexOf('")')-5)}
else{
	e.vmlBg=e.src}
g=this;
	if(!g.imgSize[e.vmlBg]){
	a=document.createElement("img");
	g.imgSize[e.vmlBg]=a;
	a.className=g.ns+"_sizeFinder";
	a.runtimeStyle.cssText="behavior:none;
	position:absolute;
	left:-10000px;
	top:-10000px;
	border:none;
	margin:0;
	padding:0;
	";
	c=function(){
	this.width=this.offsetWidth;
	this.height=this.offsetHeight;
	g.vmlOffsets(e)}
;
	a.attachEvent("onload",c);
	a.src=e.vmlBg;
	a.removeAttribute("width");
	a.removeAttribute("height");
	document.body.insertBefore(a,document.body.firstChild)}
e.vml.image.fill.src=e.vmlBg;
	f=false}
e.vml.image.fill.on=!f;
	e.vml.image.fill.color="none";
	e.vml.color.shape.style.backgroundColor=d.backgroundColor;
	e.runtimeStyle.backgroundImage="none";
	e.runtimeStyle.backgroundColor="transparent"}
,vmlOffsets:function(d){
	var h,n,a,e,g,m,f,l,j,i,k;
	h=d.currentStyle;
	n={
	W:d.clientWidth+1,H:d.clientHeight+1,w:this.imgSize[d.vmlBg].width,h:this.imgSize[d.vmlBg].height,L:d.offsetLeft,T:d.offsetTop,bLW:d.clientLeft,bTW:d.clientTop}
;
	a=(n.L+n.bLW==1)?1:0;
	e=function(b,p,q,c,s,u){
	b.coordsize=c+","+s;
	b.coordorigin=u+","+u;
	b.path="m0,0l"+c+",0l"+c+","+s+"l0,"+s+" xe";
	b.style.width=c+"px";
	b.style.height=s+"px";
	b.style.left=p+"px";
	b.style.top=q+"px"}
;
	e(d.vml.color.shape,(n.L+(d.isImg?0:n.bLW)),(n.T+(d.isImg?0:n.bTW)),(n.W-1),(n.H-1),0);
	e(d.vml.image.shape,(n.L+n.bLW),(n.T+n.bTW),(n.W),(n.H),1);
	g={
	X:0,Y:0}
;
	if(d.isImg){
	g.X=parseInt(h.paddingLeft,10)+1;
	g.Y=parseInt(h.paddingTop,10)+1}
else{
	for(j in g){
	if(g.hasOwnProperty(j)){
	this.figurePercentage(g,n,j,h["backgroundPosition"+j])}
}
}
d.vml.image.fill.position=(g.X/n.W)+","+(g.Y/n.H);
	m=h.backgroundRepeat;
	f={
	T:1,R:n.W+a,B:n.H,L:1+a}
;
	l={
	X:{
	b1:"L",b2:"R",d:"W"}
,Y:{
	b1:"T",b2:"B",d:"H"}
}
;
	if(m!="repeat"||d.isImg){
	i={
	T:(g.Y),R:(g.X+n.w),B:(g.Y+n.h),L:(g.X)}
;
	if(m.search("repeat-")!=-1){
	k=m.split("repeat-")[1].toUpperCase();
	i[l[k].b1]=1;
	i[l[k].b2]=n[l[k].d]}
if(i.B>n.H){
	i.B=n.H}
d.vml.image.shape.style.clip="rect("+i.T+"px "+(i.R+a)+"px "+i.B+"px "+(i.L+a)+"px)"}
else{
	d.vml.image.shape.style.clip="rect("+f.T+"px "+f.R+"px "+f.B+"px "+f.L+"px)"}
}
,figurePercentage:function(d,c,f,a){
	var b,e;
	e=true;
	b=(f=="X");
	switch(a){
	case"left":case"top":d[f]=0;
	break;
	case"center":d[f]=0.5;
	break;
	case"right":case"bottom":d[f]=1;
	break;
	default:if(a.search("%")!=-1){
	d[f]=parseInt(a,10)/100}
else{
	e=false}
}
d[f]=Math.ceil(e?((c[b?"W":"H"]*d[f])-(c[b?"w":"h"]*d[f])):parseInt(a,10));
	if(d[f]%2===0){
	d[f]++}
return d[f]}
,fixPng:function(c){
	c.style.behavior="none";
	var g,b,f,a,d;
	if(c.nodeName=="BODY"||c.nodeName=="TD"||c.nodeName=="TR"){
	return}
c.isImg=false;
	if(c.nodeName=="IMG"){
	if(c.src.toLowerCase().search(/\.png$/)!=-1){
	c.isImg=true;
	c.style.visibility="hidden"}
else{
	return}
}
else{
	if(c.currentStyle.backgroundImage.toLowerCase().search(".png")==-1){
	return}
}
g=DD_belatedPNG;
	c.vml={
	color:{
}
,image:{
}
}
;
	b={
	shape:{
}
,fill:{
}
}
;
	for(a in c.vml){
	if(c.vml.hasOwnProperty(a)){
	for(d in b){
	if(b.hasOwnProperty(d)){
	f=g.ns+":"+d;
	c.vml[a][d]=document.createElement(f)}
}
c.vml[a].shape.stroked=false;
	c.vml[a].shape.appendChild(c.vml[a].fill);
	c.parentNode.insertBefore(c.vml[a].shape,c)}
}
c.vml.image.shape.fillcolor="none";
	c.vml.image.fill.type="tile";
	c.vml.color.fill.on=false;
	g.attachHandlers(c);
	g.giveLayout(c);
	g.giveLayout(c.offsetParent);
	c.vmlInitiated=true;
	g.applyVML(c)}
}
;
	try{
	document.execCommand("BackgroundImageCache",false,true)}
catch(r){
}
DD_belatedPNG.createVmlNameSpace();
	DD_belatedPNG.createVmlStyleSheet();

CSS代码(style.css):

body{font-family:Lucida Sans Unicode,Trebuchet MS,Verdana,Arial,Helvetica,sans-serif;font-size:12px;color:#444;}
a img{border:none;}
#wrapper{width:900px;margin:0px auto;padding:0 0 20px 0;}
h3{color:#396A88;font-size:1.6em;}
h6{color:#888;font-size:1.2em;padding:0;margin:0;font-family:georgia,Times New Roman,Times,Serif;font-style:italic;}
p{width:600px;}
#container{background:url(../images/gradient.jpg);position:relative;width:899px;height:358px;}
#overlay{position:absolute;top:0;left;0;width:899px;height:358px;background:url(../images/overlay.png);}
#container2{background:url(../images/gradient.jpg);position:relative;width:640px;height:100px;}
div#title{text-align:right;font-size:140px;font-weight:bold;font-family:Arial,Helvetica,Verdana,sans-serif;letter-spacing:-10px;color:#fff;line-height:105px;padding:110px 10px 0 0;}
#overlay2{position:absolute;top:0;left;0;width:640px;height:100px;background:url(../images/overlay.png);}
#download{position:absolute;top:0;left;0;width:640px;height:100px;}
pre{padding:20px;background:#f2f2f2;font-weight:bold;width:600px;}
div.note{padding:10px 20px 10px 20px;background:#f2f2f2;font-weight:normal;width:600px;}
div.note h3{padding:0;margin:0;color:#e00000;}
span.red{color:#e00000;}
span.grey{color:#999;}

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