Javascript获取页面元素的绝对位置实现

function getElementAbsPos(e) 
{
    var t = e.offsetTop;
    var l = e.offsetLeft;
    while(e = e.offsetParent)
    {
        t += e.offsetTop;
    l += e.offsetLeft;
    }
 
    return {left:l,top:t};
}

/**
 * @param e 页面元素
 * @param arrParentid 页面元素e所在的iframe的数组
 * @param isID 参数arrParentid中是iframe的id还是object
 */
function getElementAbsPos(e,arrParentid,isID) 
{
    var t = e.offsetTop;
    var l = e.offsetLeft;
    while(e = e.offsetParent)
    {
        t += e.offsetTop;
    l += e.offsetLeft;
    }
    if(arguments.length >= 2)
    {
        for(var i=0; i<arrParentid.length; i++)
        {
            e = (isID==true) ? top.document.getElementById(arrParentid[i]) : arrParentid[i];
            t += e.offsetTop;
        l += e.offsetLeft;
            while(e = e.offsetParent)
            {
                t += e.offsetTop;
        l += e.offsetLeft;
            }
        }
    }
    
    return {left:l,top:t};
}