如何得到拖放DIV当前的坐标值（div左上角的坐标值）？

Question

<script> 
document.execCommand("2D-position",false,true); 
</script> 
<DIV contentEditable=true> 
<DIV style="WIDTH: 300px; POSITION: absolute; HEIGHT: 100px; BACKGROUND-COLOR: red ;filter:alpha(opacity=30)" onmouseup="alert(this.style.top);alert(this.style.left);">移动层</DIV> 
</DIV>

Answer 1

function getLeft(div)
{
    var left = 0;
    while(div!= null)
    {
        left += div.offsetLeft;
        div= div.offsetParent; 
    }      
    return left; 
}
同理 TOP