var X = $('#DivID').offset().top;
var Y = $('#DivID').offset().left;
获取相对(父元素)位置:
var X = $('#DivID').position().top;
var Y = $('#DivID').position().left;

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" /
titlejava Test/title
/head
style type="text/css"
!--
body,div { margin:0; padding:0;}
--
/style
script type="text/javascript" src="js/jquery.js"/script

body
div style="background:#ccc;height:300px;" onclick=""/div
div style="position:relative;"
div style=" position:absolute;left:50px; top:50px;" id="DivID"/div
/div
script type="text/javascript"
var X = $('#DivID').offset().top;
var Y = $('#DivID').offset().left;
document.write(X+"br /");
document.write(Y+"br /");
//获取相对(父元素)位置:
var C = $('#DivID').position().top;
var D = $('#DivID').position().left;
document.write(C+"br /");
document.write(D);
/script
/body
/html