javascript弹出拖动窗口

可以拖动的弹出窗口，在很多网页上都可以见到，非常的人性化，下面通过一段javascript代码就可以实现弹出拖动窗口，废话不多说了，直接贴代码了。

<!DOCTYPE html>
<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="http://www.jb51.net/" />
<title>可以拖动的弹出窗口</title>
<style type="text/css">
#popDiv
{
 position:absolute;
 visibility:hidden;
 overflow:hidden;
 border:2px solid #AEBBCA;
 background-color:#EEF1F8;
 cursor:move;
 padding:1px;
}
#popTitle
{
 background:#9DACBF;
 height:20px;
 line-height:20px;
 padding:1px;
}
#popForm
{
 padding:2px;
}
.title_left
{
 font-weight:bold;
 padding-left:5px;
 float:left;
}
.title_right
{
 float:right;
}
#popTitle .title_right a
{
 color:#000;
 text-decoration:none;
}
#popTitle .title_right a:hover
{
 text-decoration:underline;
 color:#FF0000;
}
</style>
<script>
function showPopup() //弹出层
{
 var objDiv=document.getElementById("popDiv");
 objDiv.style.top="50px";//设置弹出层距离上边界的距离
 objDiv.style.left="200px";//设置弹出层距离左边界的距离
 objDiv.style.width="300px";//设置弹出层的宽度
 objDiv.style.height="200px";//设置弹出层的高度
 objDiv.style.visibility="visible";
}
function hidePopup()//关闭层
{
 var objDiv=document.getElementById("popDiv");
 objDiv.style.visibility="hidden";
}
</script>
</head>
<body>
<div id="popDiv">
 <div id="popTitle"> <!-- 标题div -->
 <span class="title_left">修改操作</span>
 <span class="title_right" onClick="hidePopup()"><a href="#">关闭</a></span>
 </div>
 <div id="popForm"></div>
</div>
<input name="" type="button" onClick="showPopup()" value="操作" />
<script type="text/javascript">
var objDiv=document.getElementById("popDiv");
var isIE=document.all?true:false;//判断浏览器类型
document.onmousedown = function(evnt)//当鼠标左键按下后执行此函数
{
 var evnt=evnt?evnt:event;
 if(evnt.button == (document.all ? 1 : 0))
 {
 mouseD = true;//mouseD为鼠标左键状态标志，为true时表示左键被按下
 }
}
objDiv.onmousedown = function(evnt)
{
 objDrag=this;//objDrag为拖动的对象
 var evnt=evnt?evnt:event;
 if(evnt.button == (document.all?1 : 0))
 {
 mx=evnt.clientX;
 my=evnt.clientY;
 objDiv.style.left=objDiv.offsetLeft+"px";
 objDiv.style.top=objDiv.offsetTop+"px";
 if(isIE)
 {
  objDiv.setCapture();
 }
 else
 {
  window.captureEvents(Event.MOUSEMOVE);
 }
 }
}
document.onmouseup=function()
{
 mouseD=false;
 objDrag="";
 if(isIE)
 {
 objDiv.releaseCapture();
 }
 else
 {
 window.releaseEvents(objDiv.MOUSEMOVE);
 }
}
document.onmousemove=function(evnt)
{
 var evnt=evnt?evnt:event;
 if(mouseD==true&&objDrag)
 {
 var mrx=evnt.clientX-mx;
 var mry=evnt.clientY-my;
 objDiv.style.left = parseInt(objDiv.style.left) + mrx + "px";
 objDiv.style.top = parseInt(objDiv.style.top) + mry + "px";
 mx = evnt.clientX;
 my = evnt.clientY;
 }
}
</script>
</body>
</html>

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