js源码--拖动div进行布局

<style>
*{font-size:12px}
.dragTable{
font-size:12px;
border-top:1px solid #3366cc;
margin-bottom: 10px;
width:100%;
background-color:#FFFFFF;
}
td{vertical-align:top;}
.dragTR{
cursor:move;
color:#7787cc;
background-color:#e5eef9;
height:20px;
padding-left:5px;
font-weight:bold;
}
</style>
<script language="javascript">
var dragged;
window.onload=init;
function init(){//初始化
for(var i=0;i<parentTable.cells.length;i++){
var subTables=parentTable.cells[i].getElementsByTagName("table");
for(var j=0;j<subTables.length;j++){
if(subTables[j].className!="dragTable")break;
subTables[j].rows[0].className="dragTR";
subTables[j].rows[0].attachEvent("onmousedown",dragStart);
}
}
document.onmousemove=draging;
document.onmouseup=dragEnd;
}

function dragStart(){
ao=event.srcElement;
if((ao.tagName=="TD")||(ao.tagName=="TR")){
ao=ao.offsetParent;
ao.style.zIndex=100;
}else
return;
dragged=true;
tdiv=document.createElement("div");
tdiv.innerHTML=ao.outerHTML;
ao.style.border="1px dashed red";
tdiv.style.display="block";
tdiv.style.position="absolute";
tdiv.style.filter="alpha(opacity=70)";
tdiv.style.cursor="move";
tdiv.style.border="1px solid #000000";
tdiv.style.width=ao.offsetWidth;
tdiv.style.height=ao.offsetHeight;
tdiv.style.top=getInfo(ao).top;
tdiv.style.left=getInfo(ao).left;
document.body.appendChild(tdiv);
lastX=event.clientX;
lastY=event.clientY;
lastLeft=tdiv.style.left;
lastTop=tdiv.style.top;
}

function getInfo(o){//取得坐标
var to=new Object();
to.left=to.right=to.top=to.bottom=0;
var twidth=o.offsetWidth;
var theight=o.offsetHeight;
while(o!=document.body){
to.left+=o.offsetLeft;
to.top+=o.offsetTop;
o=o.offsetParent;
}
to.right=to.left+twidth;
to.bottom=to.top+theight;
return to;
}
//返回一个对象

function draging(){//重要:判断MOUSE的位置
if(!dragged||ao==null)return;
var tX=event.clientX;
var tY=event.clientY;
tdiv.style.left=parseInt(lastLeft)+tX-lastX;
tdiv.style.top=parseInt(lastTop)+tY-lastY;
for(var i=0;i<parentTable.cells.length;i++){
var parentCell=getInfo(parentTable.cells[i]);
if(tX>=parentCell.left&&tX<=parentCell.right&&tY>=parentCell.top&&tY<=parentCell.bottom){
var subTables=parentTable.cells[i].getElementsByTagName("table");
if(subTables.length==0){
if(tX>=parentCell.left&&tX<=parentCell.right&&tY>=parentCell.top&&tY<=parentCell.bottom){
parentTable.cells[i].appendChild(ao);
}
break;
}
for(var j=0;j<subTables.length;j++){
var subTable=getInfo(subTables[j]);
if(tX>=subTable.left&&tX<=subTable.right&&tY>=subTable.top&&tY<=subTable.bottom){
parentTable.cells[i].insertBefore(ao,subTables[j]);
break;
}else{
parentTable.cells[i].appendChild(ao);
}
}
}
}
}

function dragEnd(){
if(!dragged)return;
dragged=false;
mm=repos(150,15);
ao.style.borderWidth="0px";
ao.style.borderTop="1px solid #3366cc";
tdiv.style.borderWidth="0px";
ao.style.zIndex=1;
}

function repos(aa,ab){
var f=tdiv.filters.alpha.opacity;
var tl=parseInt(getInfo(tdiv).left);
var tt=parseInt(getInfo(tdiv).top);
var kl=(tl-getInfo(ao).left)/ab;
var kt=(tt-getInfo(ao).top)/ab;
var kf=f/ab;
return setInterval(function(){if(ab<1){
clearInterval(mm);
tdiv.removeNode(true);
ao=null;
return;
}
ab--;
tl-=kl;
tt-=kt;
f-=kf;
tdiv.style.left=parseInt(tl)+"px";
tdiv.style.top=parseInt(tt)+"px";
tdiv.filters.alpha.opacity=f;
}
,aa/ab)
}

</script>
<table border="0" cellpadding="0" cellspacing="10" width="100%" height=500 id="parentTable">
<tr >
<td width="25%" valgin="top">
<table border=0 class="dragTable" cellspacing="0">
<tr>
<td><b>GMAIL</b></td>
</tr>
<tr>
<td>暂时无法显示GMAIL内容</td>
<tr>
</table><table border=0 class="dragTable" cellspacing="0">
<tr>
<td>新浪体育</td>
</tr>
<tr>
<td>解剖威队独门利器FW28 2万转引擎匹配超级变速器颁奖：辛吉斯欣喜能以冠军起步<br/> 印度搭档创下纪录法新社前瞻冬奥短道速滑：中韩唱主角 美加施冷箭</td>
<tr>
</table>
<table border=0 class="dragTable" cellspacing="0" id="cc">
<tr>
<td>焦点</td>
</tr>
<tr>
<td>京广线中断4小时20临客返汉晚点 中国新闻网-湖北分社 - 所有 235 相关报道 ?哈马斯已有总理人选
解放日报报业集团 - 所有 489 相关报道 ?陈水扁是两岸关系麻烦制造者 武汉晨报 - 所有 179 相关报道 ?</td>
<tr>
</table>
</td>
<td width="25%">
<table border=0 class="dragTable" cellspacing="0" id="dd">
<tr>
<td>中关村在线</td>
</tr>
<tr>
<td>新年行情速递 双敏板卡低价推荐 终于等到了，映泰6600GT一降降一百 罗技G15游戏键盘热力促销，代购价仅529元 </td>
<tr>
</table></td>
<td width="25%">
<table border=0 class="dragTable" cellspacing="0">
<tr>
<td>网易商业</td>
</tr>
<tr>
<td>上海GDP增幅去年出现回落应对反倾销 中国鞋企联手对抗欧盟尹家绪操盘南方汽车 长安谋求曲线整体境外上市</td>
<tr>
</table><table border=0 class="dragTable" cellspacing="0">
<tr>
<td>黑可天下</td>
</tr>
<tr>
<td>上海GDP增幅去年出现回落应对反倾销 中国鞋企联手对抗欧盟尹家绪操盘南方汽车 长安谋求曲线整体境外上市</td>
<tr>
</table>
</td>
</tr>
</table>
<form name="form1" method="post" action="">
  <input type="button" name="Button" value="Button" onclick="aaa()">
</form>
<script language="javascript">
function aaa(){
parentTable.cells[0].insertBefore(document.getElementById("dd"),document.getElementById("cc"));
}
/*
# function dragEnd(){ 
# if(!dragged)return; 
# dragged=false; 
# ao.style.borderWidth="0px"; 
# ao.style.borderTop="1px solid #3366cc"; 
# tdiv.style.borderWidth="0px"; 
# ao.style.zIndex=1; 
# f=tdiv.filters.alpha.opacity; 
# tl=parseInt(getInfo(tdiv).left); 
# tt=parseInt(getInfo(tdiv).top); 
# kl=(tl-getInfo(ao).left)/15; 
# kt=(tt-getInfo(ao).top)/15; 
# kf=f/15; 
# i=0; 
# aaa(); 
# } 
# function aaa(){ 
# if(i<15){ 
# tl-=kl 
# tt-=kt 
# f-=kf 
# i++; 
# tdiv.style.left=parseInt(tl)+"px"; 
# tdiv.style.top=parseInt(tt)+"px"; 
# tdiv.filters.alpha.opacity=f; 
# setTimeout("aaa()",15) 
# } 
# else{ 
# tdiv.removeNode(true); 
# } 
# }  */
</script>