div滚动与控制
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk" />
<title>随屏滚动 - Liehuo.net</title>
<style>
html,body{
padding:0;
margin:0;
}
</style>
</head>
<body>
<div id="aa" style="width:200px;height:200px;background:#c0c0c0;" >我跟随屏幕滚动</div>
<div id="bb" style="width:200px;height:200px;background:#c0c0c0;" >我是固定不会动</div>
<div style="width:100%;height:500px;background:#000"></div>
<div style="width:100%;height:500px;background:green"></div>
<div style="width:100%;height:500px;background:red"></div>
</body>
</html>
<script>
function scroll(p){
var d = document,dd = d.documentElement,db = d.body,w = window,o = d.getElementById(p.id),ie = /msie/i.test(navigator.userAgent),style;
if(o){
o.style.cssText +=";position:"+(p.f&&!ie?'fixed':'absolute')+";"+(p.l==undefined?'right:0;':'left:'+p.l+'px;')+(p.t!=undefined?'top:'+p.t+'px':'bottom:0');
if(p.f&&ie){
o.style.cssText +=';left:expression(body.scrollLeft + '+(p.l==undefined?db.clientWidth-o.offsetWidth:p.l)+' + "px");top:expression(body.scrollTop +'+(p.t==undefined?db.clientHeight-o.offsetHeight:p.t)+'+ "px" );'
db.style.cssText +=";background-image:url(about:blank);background-attachment:fixed;"
}else{
if(!p.f){
w.onresize = w.onscroll = function(){
var timer,timer1;
return function(){
if(timer)
clearTimeout(timer);
timer = setTimeout(function(){
timer1 = setInterval(function(){
var st = db.scrollTop,c;
c = st - o.offsetTop + (p.t!=undefined?p.t:(w.innerHeight||db.clientHeight)-o.offsetHeight);
if(c!=0){
o.style.top = o.offsetTop + Math.ceil(Math.abs(c)/10)*(c<0?-1:1) + 'px';
}else{
clearInterval(timer1);
}
},10)
},100)//控制滚动的频率越大频率越慢
}
}()
}
}
}
}
scroll({
id:'aa'
})
scroll({
id:'bb',
l:0,
t:200,
f:1
})
</script><br />
