基于jquery完美拖拽，可返回拖动轨迹

复制代码代码如下:

<!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=utf-8" /> 
<title>完美拖拽</title> 
<style type="text/css"> 
html, body { 
overflow:hidden; 
} 
body, div, h2, p { 
margin:0; 
padding:0; 
} 
body { 
color:#fff; 
background:#000; 
font:12px/2 Arial; 
} 
p { 
padding:0 10px; 
margin-top:10px; 
} 
span { 
color:#ff0; 
padding-left:5px; 
} 
#box { 
position:absolute; 
width:300px; 
height:150px; 
background:#333; 
border:2px solid #ccc; 
top:150px; 
left:400px; 
margin:0; 
} 
#box h2 { 
height:25px; 
cursor:move; 
background:#222; 
border-bottom:2px solid #ccc; 
text-align:right; 
padding:0 10px; 
} 
#box h2 a { 
color:#fff; 
font:12px/25px Arial; 
text-decoration:none; 
outline:none; 
} 
</style> 
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js" type="text/javascript"></script> 
<script type="text/javascript"> 
$(function(){ 
var bDrag = false; 
var _x,_y; 
var $box=$("#box") 
var aPos = [{ 
x: $("#box").offset().left, 
y: $("#box").offset().top 
}]; 
$("span:eq(1)").text(aPos[0].y); 
$("span:eq(2)").text(aPos[0].x); 
$("#box h2:first").mousedown(function(event){ 
var e=event || window.event; 
bDrag = true; 
_x=e.pageX-$box.position().left; 
_y=e.pageY-$box.position().top; 
return false 
}) 
$(document).mousemove(function(event){ 
if(!bDrag) return false; 
var e=event || window.event; 
var x=e.pageX-_x; 
var y=e.pageY-_y; 
var maxL = $(document).width() - $box.outerWidth(); 
var maxT = $(document).height() - $box.outerHeight(); 
x = x < 0 ? 0: x; 
x = x > maxL ? maxL: x; 
y = y < 0 ? 0: y; 
y = y > maxT ? maxT: y; 
$box.css({left:x,top:y}); 
aPos.push({ 
x: x, 
y: y 
}); 
status() 
return false 
}).mouseup(function(){ 
bDrag = false; 
status() 
return false 
}) 
$("#box h2:first a").click(function(){ 
if (aPos.length == 1) return; 
var timer = setInterval(function() { 
var oPos = aPos.pop(); 
oPos ? ($box.css({left : oPos.x + "px", top : oPos.y + "px"})) : clearInterval(timer) 
status(); 
},30); 
}).mousedown(function(){return false}) 
function status() { 
$("#box span:eq(0)").text(bDrag); 
$("#box span:eq(1)").text($box.position().top); 
$("#box span:eq(2)").text($box.position().left); 
} 
status() 
}) 
</script> 
</head> 

<body> 
<div id="box"> 
<h2><a href="javascript:;">点击回放拖动轨迹</a></h2> 
<p><strong>Drag:</strong><span></span></p> 
<p><strong>top:</strong><span></span></p> 
<p><strong>left:</strong><span></span></p> 
</div> 
</body> 
</html> 