<!DOCTYPE html>
<html>
<title>简单拖曵原理实例</title>
<script language="javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript">
$(function(){
//样式
$("#drag").css({"position":"absolute","top":"100px","left":"100px","border":"1px solid #789","width":"150px","height":"90px","background":"#988f82","cursor":"move"})
/*+++++ 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;
$("#drag").mousedown(function(e) {
dragging = true;
iX = e.clientX - this.offsetLeft;
iY = e.clientY - this.offsetTop;
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;
$("#drag").css({"left":oX + "px", "top":oY + "px"});
return false;
}
};
$(document).mouseup(function(e) {
dragging = false;
$("#drag")[0].releaseCapture();
e.cancelBubble = true;
})
})
</script>
</head>
<body>
<div id="drag"></div>
</body>
</html> 作者：欢醉
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