本节分享一个js 左右悬浮广告的代码。
1，js代码
文件名：ad_left_right.js
<script language="javascript"> //左右悬浮广告 //by www.jb200.com 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(); </script>
2，html代码部分
<html> <head> <title>左右悬浮广告的代码-www.jb200.com</title> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> </head> <body> <p> </p> 说明：为达到满意的测试效果（左右悬浮广告），这里的段落，请大家自行添加。 <p> <script language=JavaScript src="js/ad-left_right.js"></script> </p> </body> </html>