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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;

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。

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