缓冲展开/关闭层_层和布局特效

CSS+JS控制一个层的展开和关闭，带缓冲动画效果，代码段含有两个示例，一个是固定高度展开，一个是根据内容的高度自动展开，比较实用。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-CN" lang="zh-CN">
<head>
<title>缓冲展开/关闭层</title>
<meta http-equiv="Content-Type" mrc="text/html; charset=gb2312">
<script type="text/javascript">
function Scroll(obj, h, s){
    var h = h || 200;
    var s = s || 1.2;
    var obj = typeof(obj)=="string"?document.getElementById(obj):obj;
    if(obj == undefined){return false;}
    var status = obj.getAttribute("status")==null;
    var oh = parseInt(obj.offsetHeight);
    obj.style.height = oh;
    obj.style.display = "block";
	obj.style.overflow = "hidden";
    if(obj.getAttribute("oldHeight") == null){
        obj.setAttribute("oldHeight", oh);
    }else{
        var oldH = Math.ceil(obj.getAttribute("oldHeight"));
    }
    var reSet = function(){
        if(status){
            if(oh < h){
                oh = Math.ceil(h-(h-oh)/s);
                obj.style.height = oh+"px";
            }else{
                obj.setAttribute("status",false);
                window.clearInterval(IntervalId);
            }
        }else{
            obj.style.height = oldH+"px";
            obj.removeAttribute("status");
            window.clearInterval(IntervalId);
        }
    }
    var IntervalId = window.setInterval(reSet,10);
	return status;
}
window.onload= function(){
    var $ = function(id){return document.getElementById(id)};
    $('menu').onclick = function(){
        Scroll('menu',this.scrollHeight,1.2);
    }
    $('test').onclick = function(){
        Scroll('test',300,1.2);
    }
}
</script>
</head>
<body>
<div id="test" style="border:1px solid #f00;width:200px;padding:6px;">展开指定高度:300px；</div>
<div id="menu" style="position:absolute;;padding:6px;top:10px;left: 380px;border:1px solid #ccc;width:200px;height:16px;text-align:center;cursor:pointer;overflow:hidden;">
根据内容高度展开<br />
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</div>
</body>
</html>

所属频道：层和布局特效/更新时间：2012-12-04

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