// 获得元素样式function attrStyle(elem,attr){    if("undefined" != typeof elem && "undefined" != typeof elem.style){        //若样式存在于html中,优先获取        return elem.style[attr];    }else if(elem.currentStyle){        //IE下获取CSS属性最终样式(同于CSS优先级)        return elem.currentStyle[attr];    }else if(document.defaultView && document.defaultView.getComputedStyle){        //W3C标准方法获取CSS属性最终样式(同于CSS优先级)        //注意,此法属性原格式(text-align)获取的,故要转换一下        attr=attr.replace(/([A-Z])/g,'-$1').toLowerCase();        //获取样式对象并获取属性值        return document.defaultView.getComputedStyle(elem,null).getPropertyValue(attr);    }else{        return null;    }}attrStyle(document.getElementById("coorDiv"), "margin-left");

// 获得元素位置

function elementLeft(e){	var offset = e.offsetLeft;	if(e.offsetParent != null) offset += elementLeft(e.offsetParent);	return offset;}function elementTop(e){	var offset=e.offsetTop;	if(e.offsetParent != null) offset += elementTop(e.offsetParent);	return offset;}function elementPos(e){	return {left:elementLeft(e), top:elementTop(e)};}