用JS写出星空
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>星空效果_www.jb51.net</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<style type="text/css">
<!--
body{
margin:0px;
padding:0px;
}
body,td{
font-size:9pt;
}
.star{
position:absolute;
width:1px;
height:1px;
font-size:0px;
background-color:#ffffff;
}
-->
</style>
<script type="text/javascript">
<!--
try{
var winSize = {
width:document.documentElement.clientWidth,
height:document.documentElement.clientHeight
}
var MooSky = function(options){
this.options = options;
this.stars = new Array();
this.show = function(){
for(var i=0;i<this.options.num;i++){
var newStar = new MooStar({
container : this.options.container
});
newStar.fly();
this.stars[i] = newStar;
}
}
}
var MooStar = function(options){
this.options = options;
if(!!this.options.container){
this.container = document.getElementById(this.options.container);
}else{
this.container = document.body;
}
this.baseSpeed = 10;
var o = this;
this.speed = Math.round(Math.random()*this.baseSpeed)+1;
this.dom = document.createElement(‘DIV‘);
this.dom.className = ‘star‘;
if(!!this.options.container){
var left = Math.round(Math.random()*this.container.offsetWidth-1);
var top = Math.round(Math.random()*this.container.offsetHeight-1);
this.dom.style.left = left+‘px‘;
this.dom.style.top = top+‘px‘;
this.container.appendChild(this.dom);
}else{
this.dom.style.left = Math.random()*winSize.width-1+‘px‘;
this.dom.style.top = Math.random()*winSize.height-1+‘px‘;
document.body.appendChild(this.dom);
}
}
MooStar.prototype.fly = function(){
if(this.dom.offsetLeft<0){
if(!!this.options.container){
var left = this.container.offsetWidth-1;
var top = Math.round(Math.random()*this.container.offsetHeight)-1;
this.dom.style.left = left+‘px‘;
this.dom.style.top = top+‘px‘;
}else{
this.dom.style.left = winSize.width-1+‘px‘;
this.dom.style.top = Math.random()*winSize.height-1+‘px‘;
}
}else{
var left = this.dom.offsetLeft-this.speed;
if(left<0) {
this.speed = Math.round(Math.random()*this.baseSpeed)+1;
if(!!this.options.container){
left = this.container.offsetWidth-1;
var top = Math.random()*this.container.offsetHeight-1;
this.dom.style.top = top+‘px‘;
}else{
left = winSize.width-1;
}
}
this.dom.style.left = left+‘px‘;
var self = this;
xywTimeout(function(){self.fly()},this.speed);
}
}
window.xywxff = function(){
var mooSky1 = new MooSky({
num:30,
container : ‘skyContainer1‘ //如果不声明container，则是给document.body实现
});
mooSky1.show();
var mooSky2 = new MooSky({
num:20,
container : ‘skyContainer2‘
});
mooSky2.show();
/*
//这是给body用的
var mooSky3 = new MooSky({
num:20
});
mooSky3.show();
*/
}
window.onresize = function(){
winSize = {
width:document.documentElement.clientWidth,
height:document.documentElement.clientHeight
}
}
}catch(e){
alert(e.description);
}
//-->
</script>
</head>
<body scroll=no bgcolor=#000000>
<div id=‘skyContainer1‘ style="height:100px;background-color:#222222;overflow:hidden;font-size:70px;color:#FFFF00;font-weight:bolder">ABCD</div>
<div id=‘skyContainer2‘ style="position:absolute;left:200px;top:200px;width:500px;height:100px;background-color:#222222;"></div>
</body>
</html>
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