<script type="text/javascript">
function b(){
    var top=document.getElementById("txt");
    var left=document.getElementById("txt");
    var t=top.offsetTop;
    var l=left.offsetLeft;
    while(top=top.offsetParent){
        t+=top.offsetTop;
        l+=left.offsetLeft;
        }
        alert(t+'px'+','+l+'px');
    }
</script>


<html>
<br />
<br />
<br />
<div id="txt">要获取该div距离顶部和左边的距离。</div>
<input onclick="b()" type="button" value="获取" />
</html>