Prototype - getOffsetParent() 方法
此方法返回元素最近定位的祖先。如果未找到，则返回 body 元素。
语法
element.getOffsetParent();
返回值
它返回一个 HTML 元素。
示例
<html>
<head>
<title>Prototype examples</title>
<script type = "text/javascript" src = "/javascript/prototype.js"></script>
<script>
function showResult() {
var node = $('father').getOffsetParent();
alert("Offset Parent is : " + node.nodeName + ':' + node.innerHTML );
}
</script>
</head>
<body>
<p>单击按钮查看结果。</p>
<div id = "grandfather">This is grand father
<div id = "father"> This is father.
<div id = "kid">This is kid</div>
</div>
</div>
<br />
<input type = "button" value = "showResult" onclick = "showResult();"/>
</body>
</html>
prototype_element_object.html
