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function getElementLeft(element) { var actualLeft = element.offsetLeft; var current = element.offsetParent; while (current!==null) { actualLeft += current.offsetLeft; current = current.offsetParent; } return actualLeft; } |
取得元素的左偏移量；
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function getElementTop(element) { var actualTop = element.offsetTop; var current = element.offsetParent; while (current!==null) { <span style="white-space:pre"> </span>actualTop += current.offsetTop; current = current.offsetParent; } return actualTop; } |
取得元素的上偏移量；
利用offsetParent属性在Dom层次中逐级向上回溯，将每个层次偏移量合计。
