效果：
多广告不冲突、随滚动条移动（一直显示在可视区域）。
floatAD.js
/**
* 漂浮广告，兼容IE
* 用法：<div id="gg1" style="width:100px;height:100px;background-color:red;color:yellow"> 广告1 </div>
* <script type="text/javascript">var ad1=new AdMove("gg1");ad1.Run();</script>
* 整理：13:12 2013年7月4日 星期四
*/
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);
}
}
}
// end 13:11 2013年7月4日 星期四
＜完＞
