Javascript教程_小巧的随屏滚动源码教程_Javascript教程_H5之家

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" "">
<html xmlns="">
<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>