TextRectangle对象

 

指定包含元素或 TextRange 对象中一行文本的矩形

 

var rect = el.getBoundingClientRect();

 

获取元素的绝对位置：

var left = rect.left

var top = rect.top

var right = rect.right

var bottom = rect.bottom

var width = rect.width,//IE中无法获取

var height = rect.height;//IE中无法获取 

 

 

function getPos(obj) {
	return {
		top : document.documentElement.scrollTop + obj.getBoundingClientRect().top,
		left : document.documentElement.scrollLeft + obj.getBoundingClientRect().left
	};
}