本文实例讲述了js实现漂浮广告的方法。分享给大家供大家参考。具体如下：
具体代码如下：
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<script type="text/javascript" src="moveobj.js"> </script>
<script type="text/javascript">
var flyimage1, flyimage2, flyimage3
function pagestart(){
flyimage1=new Chip("flyimage1",47,68);
flyimage2=new Chip("flyimage2",47,68);
flyimage3=new Chip("flyimage3",47,68);
movechip("flyimage1");
movechip("flyimage2");
movechip("flyimage3");
}
if (window.addEventListener)
window.addEventListener("load", pagestart, false)
else if (window.attachEvent)
window.attachEvent("onload", pagestart)
else if (document.getElementById)
window.onload=pagestart
</script>
</head>
<body>
<DIV ID="flyimage1" STYLE="position:absolute; left: -500px; width:47; height:68;">
<A><IMG SRC="img/1.gif" BORDER=0></a>
</DIV>
<DIV ID="flyimage2" STYLE="position:absolute; left: -500px; width:47; height:68;">
<A><IMG SRC="img/2.gif" BORDER=0></a>
</DIV>
<DIV ID="flyimage3" STYLE="position:absolute; left: -500px; width:47; height:68;">
<A><IMG SRC="img/3.gif" BORDER=0></a>
</DIV>
</body>
</html>
moveobj.js：
var vmin=2;
var vmax=5;
var vr=2;
var timer1;
function iecompattest(){
return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body
}
function Chip(chipname,width,height){
this.named=chipname;
this.vx=vmin+vmax*Math.random();
this.vy=vmin+vmax*Math.random();
this.w=width+20;
this.h=height;
this.xx=0;
this.yy=0;
this.timer1=null;
}
function movechip(chipname){
if (document.getElementById){
eval("chip="+chipname);
if (window.innerWidth || window.opera){
pageX=window.pageXOffset;
pageW=window.innerWidth-40;
pageY=window.pageYOffset;
pageH=window.innerHeight-20;
}
else if (document.body){
pageX=iecompattest().scrollLeft;
pageW=iecompattest().offsetWidth-40;
pageY=iecompattest().scrollTop;
pageH=iecompattest().offsetHeight-20;
}
chip.xx=chip.xx+chip.vx;
chip.yy=chip.yy+chip.vy;
chip.vx+=vr*(Math.random()-0.5);
chip.vy+=vr*(Math.random()-0.5);
if(chip.vx>(vmax+vmin)) chip.vx=(vmax+vmin)*2-chip.vx;
if(chip.vx<(-vmax-vmin)) chip.vx=(-vmax-vmin)*2-chip.vx;
if(chip.vy>(vmax+vmin)) chip.vy=(vmax+vmin)*2-chip.vy;
if(chip.vy<(-vmax-vmin)) chip.vy=(-vmax-vmin)*2-chip.vy;
if(chip.xx<=pageX){
chip.xx=pageX;
chip.vx=vmin+vmax*Math.random();
}
if(chip.xx>=pageX+pageW-chip.w){
chip.xx=pageX+pageW-chip.w;
chip.vx=-vmin-vmax*Math.random();
}
if(chip.yy<=pageY)
{chip.yy=pageY;
chip.vy=vmin+vmax*Math.random();
}
if(chip.yy>=pageY+pageH-chip.h)
{chip.yy=pageY+pageH-chip.h;
chip.vy=-vmin-vmax*Math.random();
}
document.getElementById(chip.named).style.left=chip.xx+"px";
document.getElementById(chip.named).style.top=chip.yy+"px";
chip.timer1=setTimeout("movechip('"+chip.named+"')",100);
}
}
运行效果图：
此特效包含的文件：
希望本文所述对大家的javascript程序设计有所帮助。
