在网站制作中我们经常遇到需要在网站上添加一些漂浮广告，但是一般只能添加一个，继续添加的话就会彼此冲突，导致脚本报错，失去效果。
为了方便大家借鉴学习，我提供一个用JS实现的方法，解决了这个问题。
这个方法兼容ie内核、火狐、Google Chrome等主流浏览器。
代码如下：
<!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>网站建设</title>
<meta http-equiv="Content-Type" content="text/html;charset=gb2312" />
<script type="text/javascript">
<!--
function addEvent(obj,evtType,func,cap){
cap=cap||false;
if(obj.addEventListener){
obj.addEventListener(evtType,func,cap);
return true;
}else if(obj.attachEvent){
if(cap){
obj.setCapture();
return true;
}else{
return obj.attachEvent("on" + evtType,func);
}
}else{
return false;
}
}
function getPageScroll(){
var xScroll,yScroll;
if (self.pageXOffset) {
xScroll = self.pageXOffset;
} else if (document.documentElement && document.documentElement.scrollLeft){
xScroll = document.documentElement.scrollLeft;
} else if (document.body) {
xScroll = document.body.scrollLeft;
}
if (self.pageYOffset) {
yScroll = self.pageYOffset;
} else if (document.documentElement && document.documentElement.scrollTop){
yScroll = document.documentElement.scrollTop;
} else if (document.body) {
yScroll = document.body.scrollTop;
}
arrayPageScroll = new Array(xScroll,yScroll);
return arrayPageScroll;
}
function GetPageSize(){
var xScroll, yScroll;
if (window.innerHeight && window.scrollMaxY) {
xScroll = document.body.scrollWidth;
yScroll = window.innerHeight + window.scrollMaxY;
} else if (document.body.scrollHeight > document.body.offsetHeight){
xScroll = document.body.scrollWidth;
yScroll = document.body.scrollHeight;
} else {
xScroll = document.body.offsetWidth;
yScroll = document.body.offsetHeight;
}
var windowWidth, windowHeight;
if (self.innerHeight) {
windowWidth = self.innerWidth;
windowHeight = self.innerHeight;
} else if (document.documentElement && document.documentElement.clientHeight) {
windowWidth = document.documentElement.clientWidth;
windowHeight = document.documentElement.clientHeight;
} else if (document.body) {
windowWidth = document.body.clientWidth;
windowHeight = document.body.clientHeight;
}
if(yScroll < windowHeight){
pageHeight = windowHeight;
} else {
pageHeight = yScroll;
}
if(xScroll < windowWidth){
pageWidth = windowWidth;
} else {
pageWidth = xScroll;
}
arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight)
return arrayPageSize;
}
var AdMoveConfig=new Object();
AdMoveConfig.IsInitialized=false;
AdMoveConfig.ScrollX=0;
AdMoveConfig.ScrollY=0;
AdMoveConfig.MoveWidth=0;
AdMoveConfig.MoveHeight=0;
AdMoveConfig.Resize=function(){
var winsize=GetPageSize();
AdMoveConfig.MoveWidth=winsize[2];
AdMoveConfig.MoveHeight=winsize[3];
AdMoveConfig.Scroll();
}
AdMoveConfig.Scroll=function(){
var winscroll=getPageScroll();
AdMoveConfig.ScrollX=winscroll[0];
AdMoveConfig.ScrollY=winscroll[1];
}
addEvent(window,"resize",AdMoveConfig.Resize);
addEvent(window,"scroll",AdMoveConfig.Scroll);
function AdMove(id){
if(!AdMoveConfig.IsInitialized){
AdMoveConfig.Resize();
AdMoveConfig.IsInitialized=true;
}
var obj=document.getElementById(id);
obj.style.position="absolute";
var W=AdMoveConfig.MoveWidth-obj.offsetWidth;
var H=AdMoveConfig.MoveHeight-obj.offsetHeight;
var x = W*Math.random(),y = H*Math.random();
var rad=(Math.random()+1)*Math.PI/6;
var kx=Math.sin(rad),ky=Math.cos(rad);
var dirx = (Math.random()<0.5?1:-1), diry = (Math.random()<0.5?1:-1);
var step = 1;
var interval;
this.SetLocation=function(vx,vy){x=vx;y=vy;}
this.SetDirection=function(vx,vy){dirx=vx;diry=vy;}
obj.CustomMethod=function(){
obj.style.left = (x + AdMoveConfig.ScrollX) + "px";
obj.style.top = (y + AdMoveConfig.ScrollY) + "px";
rad=(Math.random()+1)*Math.PI/6;
W=AdMoveConfig.MoveWidth-obj.offsetWidth;
H=AdMoveConfig.MoveHeight-obj.offsetHeight;
x = x + step*kx*dirx;
if (x < 0){dirx = 1;x = 0;kx=Math.sin(rad);ky=Math.cos(rad);}
if (x > W){dirx = -1;x = W;kx=Math.sin(rad);ky=Math.cos(rad);}
y = y + step*ky*diry;
if (y < 0){diry = 1;y = 0;kx=Math.sin(rad);ky=Math.cos(rad);}
if (y > H){diry = -1;y = H;kx=Math.sin(rad);ky=Math.cos(rad);}
}
this.Run=function(){
var delay = 10;
interval=setInterval(obj.CustomMethod,delay);
obj.onmouseover=function(){clearInterval(interval);}
obj.onmouseout=function(){interval=setInterval(obj.CustomMethod, delay);}
}
}
//-->
</script>
</head>
<body>
<div id="gg1" style="width:100px;height:100px;background-color:red;color:yellow">
<a href="http://www.787866.com/">网站制作</a>
</div>
<div id="gg2" style="width:100px;height:100px;background-color:blue;color:yellow">
<a href="http://www.eforces.cn/">软件开发</a>
</div>
<div id="gg3" style="width:100px;height:100px;background-color:green;color:yellow">
<a href="http://dl.eforces.cn/">大连网站制作</a>
</div>
<script type="text/javascript">
<!--
var ad1=new AdMove("gg1");
ad1.Run();
var ad2=new AdMove("gg2");
ad2.Run();
var ad3=new AdMove("gg3");
ad3.Run();
//-->
</script>
</body>
</html>
