JS实现页面的拖动布局

<meta http-equiv="Content-Type" content="text/html; charset=utf-8"><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 #FF0000;
        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}
      .mo .nr{height:80px;border:1px solid #F3F3F3;margin:2px}
      h1{margin:0px;padding:0px;text-align:left;font-size:12px}
    </style><script>
        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.onload=function(){
            on_ini()
            var o=document.getElementsByTagName("h1")
            for(var i=0;i<o.length;i++){
                o[i].onmousedown=addevent
            }
        }
        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.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"
            var om=document.createElement("div")
            dragobj.otemp=om
            om.style.width=dragobj.xy[2]+"px"
            om.style.height=dragobj.xy[3]+"px"
            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)
            }
        }
        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;
        }
        function createtmpl(e){
            for(var i=0;i<domid;i++){
                if($("m"+i)==dragobj.o)
                    continue
                var b=inner($("m"+i),e)
                if(b==0)
                    continue
                dragobj.otemp.style.width=$("m"+i).offsetWidth
                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
            $(&apos;dom0&apos;).appendChild(o)
            o.innerHTML="<h1>dom"+domid+"</h1><div class=nr></div>"
            o.getElementsByTagName("h1")[0].onmousedown=addevent
            domid++
        }
    </script>

      

        

          
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