如何使用javascript捕获html元素的x，y位置
我在html文档中有一些具有某些CSS类的div元素，并想获得这些元素的x，y位置，请先感谢。
I have in my html document several div elements with certain css class and want to get x, y position of those elements, thanks in advance.
使用 getBoundingClientRect ：
http://ejohn.org/blog/getboundingclientrect-is-awesome/
例如：
var div = document.getElementById("yourDiv");
var rect = div.getBoundingClientRect();
alert("Coordinates: " + rect.left + "px, " + rect.top + "px");
记住 getBoundingClientRect 给出坐标相对于当前视口，这意味着，如果您想知道相对于 document.body 的坐标，则必须添加水平和垂直滚动金额（对于Firefox，为 document.documentElement.scrollLeft 或 document.body.scrollLeft 。 scrollTop 当然。）
Remember that getBoundingClientRect gives the coordinates relative to the current viewport, which means that if you want to know the coordinates relative to the document.body, you have to add the horizontal and vertical scroll amounts (document.documentElement.scrollLeft or document.body.scrollLeft for Firefox, and .scrollTop of course).