现在很多网站广告做的如火如荼，现在我就来介绍一下常见的对联浮动广告效果的代码使用方法，介绍的这种效果，在1024*768分辨率下正常显示，在800*600的分辨率下可以自动隐藏，以免遮住页面影响访问者浏览内容，下面就是实现效果所需代码：

var delta=0.015

var collection;

function floaters() {

this.items = [];

this.addItem = function(id,x,y,content)

{

document.write('<DIV id='+id+' style="Z-INDEX: 0; POSITION: absolute; width:80px; height:60px;left:'+(typeof(x)=='string'?eval(x):x)+';top:'+(typeof(y)=='string'?eval(y):y)+'">'+content+'</DIV>');

var newItem = {};

newItem.object = document.getElementById(id);

newItem.x = x;

newItem.y = y;

this.items[this.items.length] = newItem;

}

this.play = function()

{

collection = this.items

setInterval('play()',10);

}

}

function play()

{

if(screen.width<=800)

{

for(var i=0;i<collection.length;i++)

{

collection[i].object.style.display = 'none';

}

return;

}

for(var i=0;i<collection.length;i++)

{

var followObj = collection[i].object;

var followObj_x = (typeof(collection[i].x)=='string'?eval(collection[i].x):collection[i].x);

var followObj_y = (typeof(collection[i].y)=='string'?eval(collection[i].y):collection[i].y);

if(followObj.offsetLeft!=(document.body.scrollLeft+followObj_x)) {

var dx=(document.body.scrollLeft+followObj_x-followObj.offsetLeft)*delta;

dx=(dx>0?1:-1)*Math.ceil(Math.abs(dx));

followObj.style.left=followObj.offsetLeft+dx;

}

if(followObj.offsetTop!=(document.body.scrollTop+followObj_y)) {

var dy=(document.body.scrollTop+followObj_y-followObj.offsetTop)*delta;

dy=(dy>0?1:-1)*Math.ceil(Math.abs(dy));

followObj.style.top=followObj.offsetTop+dy;

}

followObj.style.display = '';

}

}

var theFloaters = new floaters();

theFloaters.addItem('followDiv1','document.body.clientWidth-100',0,'</a><br><a href=广告链接地址 target=_blank><img src=广告图片地址 width=100 height=400 border=0></a>');

theFloaters.addItem('followDiv2',0,0,'<br><a href=广告链接地址 target=_blank><img src=广告图片地址 width=100 height=400 border=0></a>');

theFloaters.play();

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