无刷新添加一个新的DIV层，并可实现的该层的拖动，鼠标拖动层可移动位置，将JS部分另存为一个新文件，用到的时候从外部引入，这个拖动层代码很流行，GG和YAHOO等大网站经常可以看到这种效果。
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>DIV层拖动，动态增加新层的JavaScript</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"> <div class=content> <div class=left id=dom0> <div class=mo id=m0> <h1>dom0</h1> <div></div> </div> <div class=mo id=m1> <h1>dom1</h1><div></div> </div> <div class=mo id=m2><h1>dom2</h1><div></div></div> <div class=mo id=m3><h1>dom3</h1><div></div></div> </div> <div class=center id=dom1> <div class=mo id=m4><h1>dom4</h1><div></div></div> <div class=mo id=m5><h1>dom5</h1><div></div></div> </div> <div class=right id=dom2> <div class=mo id=m8><h1>dom8</h1><div></div></div> <div class=mo id=m9><h1>dom9</h1><div></div></div> </div> </div> </body> </html>