Javascript教程_小巧的随屏滚动源码教程
重新修正
1.滚动时抖动的问题，主要体现在ff3.6上
2.加入了ie6下的固定
3.分成了两个块，xhtml,html解析
4.随着屏幕大小而变动
兼容ie6 7 8
ff3.5 3.6
chrome 4.1.2
safari
xhtml1.0解析
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk" />
<title>Untitled Document</title>
<style>
html,body{
padding:0;
margin:0;
}
</style>
</head>
<body>
<div id="aa" style="width:100px;height:100px;background:#c0c0c0;" >我在随平滚</div>
<div id="bb" style="width:100px;height:100px;background:#c0c0c0;" >我静止不动</div>
<div style="width:100%;height:1500px;background:#000"></div>
<div style="width:100%;height:1500px;background:green"></div>
<div style="width:100%;height:1500px;background:red"></div>
</body>
</html>
<script>
function scrollx(p){
var d = document,dd = d.documentElement,db = d.body,w = window,o = d.getElementById(p.id),ie6 = /msie 6/i.test(navigator.userAgent),style,timer;
if(o){
o.style.cssText +=";position:"+(p.f&&!ie6?'fixed':'absolute')+";"+(p.l==undefined?'right:0;':'left:'+p.l+'px;')+(p.t!=undefined?'top:'+p.t+'px':'bottom:0');
if(p.f&&ie6){
o.style.cssText +=';left:expression(documentElement.scrollLeft + '+(p.l==undefined?dd.clientWidth-o.offsetWidth:p.l)+' + "px");top:expression(documentElement.scrollTop +'+(p.t==undefined?dd.clientHeight-o.offsetHeight:p.t)+'+ "px" );';
dd.style.cssText +=';background-image: url(about:blank);background-attachment:fixed;';
}else{
if(!p.f){
w.onresize = w.onscroll = function(){
clearInterval(timer);
timer = setInterval(function(){
//双选择为了修复chrome 下xhtml解析时dd.scrollTop为 0
var st = (dd.scrollTop||db.scrollTop),c;
c = st - o.offsetTop + (p.t!=undefined?p.t:(w.innerHeight||dd.clientHeight)-o.offsetHeight);
if(c!=0){
o.style.top = o.offsetTop + Math.ceil(Math.abs(c)/10)*(c<0?-1:1) + 'px';
}else{
clearInterval(timer);
}
},10)
}
}
}
}
}
scrollx({
id:'aa'
})
scrollx({
id:'bb',
l:0,
t:200,
f:1
})
/*
id 你要滚动的内容的id
l 横坐标的位置 不写为紧贴右边
t 你要放在页面的那个位置默认是贴着底边 0是贴着顶边
f 1表示固定 不写或者0表示滚动
*/
</script>
html4.01解析
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk" />
<title>Untitled Document</title>
<style>
html,body{
padding:0;
margin:0;
}
</style>
</head>
<body>
<div id="aa" style="width:100px;height:100px;background:#c0c0c0;" >我在随平滚</div>
<div id="bb" style="width:100px;height:100px;background:#c0c0c0;" >我静止不动</div>
<div style="width:100%;height:1500px;background:#000"></div>
<div style="width:100%;height:1500px;background:green"></div>
<div style="width:100%;height:1500px;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,timer;
if(o){
//ie8下position:fixed下top left失效
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(){
clearInterval(timer);
timer = 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(timer);
}
},10)
}
}
}
}
}
scroll({
id:'aa'
})
scroll({
id:'bb',
l:0,
t:200,
f:1
})
/*
id 你要滚动的内容的id
l 横坐标的位置 不写为紧贴右边
t 你要放在页面的那个位置默认是贴着底边 0是贴着顶边
f 1表示固定 不写或者0表示滚动
*/
</script>
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