Js无刷新添加新层，拖动DIV层可互换位置的JavaScript实现

答案：<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>Js无刷新添加新层</title>
<style>
body {margin:0px;padding:0px;font-size:12px;text-align:center;}
body > div {text-align:center; margin-right:auto; margin-left:auto;} 
.content{width:900px;}
.content .left{
    float:left;
    width:20%;
    border:1px solid #0066CC;
    margin:3px;
}
.content .center{float:left;border:1px solid #FF0000;margin:3px;width:57%}
.content .right{float:right;width:20%;border:1px solid #FF0000;margin:3px}
.mo{height:auto;border:1px solid #CCC;margin:3px;background:#FFF}
.mo h1{background:#ECF9FF;height:18px;padding:3px;cursor:move}
.closediv{cursor:default;}
.minusspan{cursor:default;}
.mo .nr{height:80px;border:1px solid #F3F3F3;margin:2px}
h1{margin:0px;padding:0px;text-align:left;font-size:12px}
.dragging {
    FILTER: progid:DXImageTransform.Microsoft.Alpha(opacity=60); opacity: 0.6; moz-opacity: 0.6
}
</style>
<script language="javascript">
var dragobj={}
window.onerror=function(){return false}
var domid=12
function on_ini(){
    String.prototype.inc=function(s){return this.indexOf(s)>-1?true:false}
    var agent=navigator.userAgent
    window.isOpr=agent.inc("Opera")
    window.isIE=agent.inc("IE") && !isOpr
    window.isMoz=agent.inc("Mozilla") && !isOpr && !isIE
    if(isMoz){
        Event.prototype.__defineGetter__("x",function(){return this.clientX+2})
        Event.prototype.__defineGetter__("y",function(){return this.clientY+2})
    }
    basic_ini()
}
function basic_ini(){
    window.$=function(obj){return typeof(obj)=="string"?document.getElementById(obj):obj}
    window.oDel=function(obj){if($(obj)!=null){$(obj).parentNode.removeChild($(obj))}}
}
window.oDel=function(obj){if($(obj)!=null){$(obj).parentNode.removeChild($(obj))}}
window.onload=function(){
    on_ini()
    var o=document.getElementsByTagName("h1")
    for(var i=0;i<o.length;i++){
        o[i].onmousedown=addevent;
        //添加折叠和关闭按钮
        var tt = document.createElement("div");
        tt.style.cssText = "float:left";
        
        var span = document.createElement("span");
        span.innerHTML = "--"+o[i].innerHTML;
        span.style.cssText = "cursor:default;";
        span.onmousedown = minusDiv;
        tt.appendChild(span);
        
        var close = document.createElement("div");
        close.innerHTML = "X";
        close.style.cssText = "cursor:default;float:right";
        close.onmousedown = closeDiv;
        o[i].innerHTML = "";
        o[i].appendChild(tt);
        o[i].appendChild(close);
    }
}
//折叠或者显示层
function minusDiv(e)
{
    e=e||event
    var nr = this.parentNode.parentNode.nextSibling;    //取得内容层
    nr.style.display = nr.style.display==""?"none":"";
}
//移出层
function closeDiv(e)
{
    e=e||event
    var mdiv = this.parentNode.parentNode;    //取得目标层
    oDel(mdiv);
}
function addevent(e){
    if(dragobj.o!=null)
        return false
    e=e||event
    dragobj.o=this.parentNode
    dragobj.xy=getxy(dragobj.o)
    dragobj.xx=new Array((e.x-dragobj.xy[1]),(e.y-dragobj.xy[0]))
    //dragobj.o.className = 'dragging';
    dragobj.o.style.width=dragobj.xy[2]+"px"
    dragobj.o.style.height=dragobj.xy[3]+"px"
    dragobj.o.style.left=(e.x-dragobj.xx[0])+"px"
    dragobj.o.style.top=(e.y-dragobj.xx[1])+"px"
    dragobj.o.style.position="absolute"
    dragobj.o.style.filter='alpha(opacity=60)';        //添加拖动透明效果
    var om=document.createElement("div")
    dragobj.otemp=om
    om.style.width=dragobj.xy[2]+"px"
    om.style.height=dragobj.xy[3]+"px"
    om.style.border = "1px dashed red";    //ikaiser添加，实现虚线框
    dragobj.o.parentNode.insertBefore(om,dragobj.o)
    return false
}
document.onselectstart=function(){return false}
window.onfocus=function(){document.onmouseup()}
window.onblur=function(){document.onmouseup()}
document.onmouseup=function(){
    if(dragobj.o!=null){
        dragobj.o.style.width="auto"
        dragobj.o.style.height="auto"
        dragobj.otemp.parentNode.insertBefore(dragobj.o,dragobj.otemp)
        dragobj.o.style.position=""
        oDel(dragobj.otemp)
        dragobj={}
    }
}
document.onmousemove=function(e){
    e=e||event
    if(dragobj.o!=null){
        dragobj.o.style.left=(e.x-dragobj.xx[0])+"px"
        dragobj.o.style.top=(e.y-dragobj.xx[1])+"px"
        createtmpl(e, dragobj.o)    //传递当前拖动对象
    }
}
function getxy(e){
    var a=new Array()
    var t=e.offsetTop;
    var l=e.offsetLeft;
    var w=e.offsetWidth;
    var h=e.offsetHeight;
    while(e=e.offsetParent){
        t+=e.offsetTop;
        l+=e.offsetLeft;
    }
    a[0]=t;a[1]=l;a[2]=w;a[3]=h
  return a;
}
function inner(o,e){
    var a=getxy(o)
    if(e.x>a[1] && e.x<(a[1]+a[2]) && e.y>a[0] && e.y<(a[0]+a[3])){
        if(e.y<(a[0]+a[3]/2))
            return 1;
        else
            return 2;
    }else
        return 0;
}
//将当前拖动层在拖动时可变化大小，预览效果
function createtmpl(e, elm){
    for(var i=0;i<domid;i++){
        if(document.getElementById("m"+i) == null)    //已经移出的层不再遍历
            continue;
        if($("m"+i)==dragobj.o)
            continue
        var b=inner($("m"+i),e)
        if(b==0)
            continue
        dragobj.otemp.style.width=$("m"+i).offsetWidth
        elm.style.width = $("m"+i).offsetWidth;
        //1为下移，2为上移
        if(b==1){
            $("m"+i).parentNode.insertBefore(dragobj.otemp,$("m"+i))
        }else{
            if($("m"+i).nextSibling==null){
                $("m"+i).parentNode.appendChild(dragobj.otemp)
            }else{
                $("m"+i).parentNode.insertBefore(dragobj.otemp,$("m"+i).nextSibling)
            }
        }
        return
    }
    for(var j=0;j<3;j++){
        if($("dom"+j).innerHTML.inc("div")||$("dom"+j).innerHTML.inc("DIV"))
            continue
        var op=getxy($("dom"+j))
        if(e.x>(op[1]+10) && e.x<(op[1]+op[2]-10)){
            $("dom"+j).appendChild(dragobj.otemp)
            dragobj.otemp.style.width=(op[2]-10)+"px"
        }
    }
}
function add_div()
{
    var o=document.createElement("div")
    o.className="mo"
    o.id="m"+domid
    $('dom0').appendChild(o)
    o.innerHTML="<h1>dom"+domid+"</h1><div class=nr></div>"
    o.getElementsByTagName("h1")[0].onmousedown=addevent
    domid++
}
</script>
</head>
<body>
<INPUT TYPE="button" value="添加一个新的DIV层" onclick="add_div();">
<div class=content>
    <div class=left id=dom0>
        <div class=mo id=m0>
            <h1>dom0</h1>
            <div class="nr"></div>
        </div>
        <div class=mo id=m1>
            <h1>dom1</h1><div class="nr"></div>
        </div>
        <div class=mo id=m2><h1>dom2</h1><div class="nr"></div></div>
        <div class=mo id=m3><h1>dom3</h1><div class="nr"></div></div>
    </div>
    <div class=center id=dom1>
        <div class=mo id=m4><h1>dom4</h1><div class="nr"></div></div>
        <div class=mo id=m5><h1>dom5&
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