標籤：over ott 相對 擷取 api set cal -o develop
關鍵API：
Element.getBoundingClientRect()mdn：https://developer.mozilla.org/en-US/docs/Web/API/Element/getBoundingClientRect
用法：
var rect = element.getBoundingClientRect();console.log(rect.top, rect.right, rect.bottom, rect.left);
擷取相對位置：
var bodyRect = document.body.getBoundingClientRect(), elemRect = element.getBoundingClientRect(), offset = elemRect.top - bodyRect.top;alert(‘Element is ‘ + offset + ‘ vertical pixels from <body>‘);
參考網址：http://stackoverflow.com/questions/442404/retrieve-the-position-x-y-of-an-html-element
我只是個搬運工，一起學習了~
[原]js擷取dom元素的實際位置及相對座標
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