js左右悬浮广告(兼容谷歌)的实例代码
本节内容：
左右悬浮广告代码
1，js代码部分
var delta=0.8;
var collection;
var closeB=false;
function floaters() {
this.items = [];
this.addItem = function(id,x,y,content)
{
document.write('<DIV id='+id+' style="Z-INDEX: 10; POSITION: absolute; width:80px; height:60px;left:'+(typeof(x)=='string'?eval_r(x):x)+';top:'+(typeof(y)=='string'?eval_r(y):y)+'">'+content+'</DIV>');
var newItem = {};
newItem.object = document.getElementByIdx_x(id);
newItem.x = x;
newItem.y = y;
this.items[this.items.length] = newItem;
}
this.play = function()
{
collection = this.items
setInterval('play()',30);
}
}
function play()
{
if(screen.width<=800 || closeB)
{
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_r(collection[i].x):collection[i].x);
var followObj_y = (typeof(collection[i].y)=='string'?eval_r(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 = '';
}
}
function closeBanner()//隐藏悬浮层
{
closeB=true;
return;
}
var theFloaters = new floaters();
theFloaters.addItem('followDiv1',0,10,'<div style="width:20px; height:200px; background:red"></div><br/><span style="width:20px; height:10px" onclick="closeBanner()">隐藏</span>');
theFloaters.addItem('followDiv2',"document.body.clientWidth-20",10,'<div style="width:20px; height:200px; background:red"></div>><br/><span style="width:20px; height:10px" onclick="closeBanner()">隐藏</span>');
theFloaters.play();
2，html部分
<head>
<title>左右悬浮广告 - www.jiaochengji.com</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
<p> </p>
<p> </p>
教程集提示：此处可以多放置一些段落与内容，以方便测试悬浮广告的效果。
<p>
<script language=JavaScript src="js/ad-02.js"></script>
</p>
</body>
</html>
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