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<!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>
<title>简单实用的可拖曳窗口</title>
<meta http-equiv="content-type" content="text/html;charset=gb2312">
<script type="text/javascript" src="http://localhost/data/resource/js/jquery.js"></script>
<script type="text/javascript">
$(function(){
//样式
$(".drag").css({"position":"absolute"})
/*+++++ 拖曳效果 ++++++
*原理：标记拖曳状态dragging，坐标位置iX、iY
* mousedown:fn(){dragging = true：记录起始坐标位置，设置鼠标捕获}
* mouseover:fn(){判断如果dragging = true，则当前坐标位置 - 记录起始坐标位置，绝对定位的元素获得差值}
* mouseup:fn(){dragging = false：释放鼠标捕获，防止冒泡}
*/
var dragging = false;
var iX, iY;
var a;
$(".drag").mousedown(function(e) {
dragging = true;
iX = e.clientX - this.offsetLeft;
iY = e.clientY - this.offsetTop;
a=$(this);
this.setCapture && this.setCapture();
return false;
});
document.onmousemove = function(e) {
if (dragging) {
var e = e || window.event;
var oX = e.clientX - iX;
var oY = e.clientY - iY;
a.css({"left":oX + "px", "top":oY + "px"});
return false;
}
};
$(document).mouseup(function(e) {
dragging = false;
a[0].releaseCapture();
e.cancelBubble = true;
})
})
</script>
</head>
<body>
<div class="drag" style="top: 500px;">
<img src="http://h.hiphotos.baidu.com/image/pic/item/4e4a20a4462309f74f6ac2ae710e0cf3d7cad601.jpg" id="a" name="a" class="a" >
</div>
<div class="drag" style="top: 200px;">
<img src="http://h.hiphotos.baidu.com/image/pic/item/4e4a20a4462309f74f6ac2ae710e0cf3d7cad601.jpg" id="a" name="a" class="a" >
</div>
</body>
</html>
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原文地址：http://www.cnblogs.com/zqxzs/p/4249633.html
