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JS实现拖动层(兼容大部分浏览器)

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一个比较好的js拖动层代码,发上来共享一下。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JS拖动层</title>
</head>

<body>
<div id="f" style="position: absolute; width: 200px; height: 150px; background-color: #ccc; top: 150px; left: 200px; z-index: 101; border: solid 1px blue;">
  <div id="title" style="background-color: Blue; cursor: move; height: 20px; color: #fff;font-size: 13px; padding-top: 5px; padding-left: 10px;"> 拖动层 </div>
  </div>
<script type="text/javascript">
var posX;
var posY;  
fdiv = document.getElementById("f");  
document.getElementById("title").onmousedown=function(e)
{
  if(!e) e = window.event; //如果是IE
  posX = e.clientX - parseInt(fdiv.style.left);
  posY = e.clientY - parseInt(fdiv.style.top);
  document.onmousemove = mousemove;  
}
document.onmouseup = function()
{
  document.onmousemove = null;
}
function mousemove(ev)
{
  if(ev==null) ev = window.event;//如果是IE
  fdiv.style.left = (ev.clientX - posX) + "px";
  fdiv.style.top = (ev.clientY - posY) + "px";
}
</script>

</body>
</html>
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