function Point(iX, iY){

    this.x = iX;

    this.y = iY;

}

 

function fGetXY(aTag){    

    var oTmp=aTag;

    var pt = new Point(0,0);

    do {        

        pt.x += oTmp.offsetLeft;

        pt.y += oTmp.offsetTop;

        oTmp = oTmp.offsetParent;

    } while(oTmp.tagName!="BODY");

    

    return pt;

}

 

如果想在触发事件的元素(例如文本框假如是myinput)下面弹出一个div

        获取触发事件的元素

       var myinput = window.event.srcElement;

        设置弹出元素的位置

        div.left = point.x; 

        div.top = point.y+myinput.offsetHeight+1; 

        div.style.visibility = 'visible';