DOM parentNode 和 parentElement 的区别 [英] Difference between DOM parentNode and parentElement
问题描述
谁能简单解释一下，经典DOM与parentNode 并在 Firefox 9 中新引入 parentElement
Can somebody explain in simple terms, what is the difference between classical DOM parentNode and newly introduced in Firefox 9 parentElement
推荐答案
parentElement 是 Firefox 9 和 DOM4 的新增功能，但它已经存在于所有其他主要浏览器中多年.
parentElement is new to Firefox 9 and to DOM4, but it has been present in all other major browsers for ages.
在大多数情况下，它与 parentNode 相同.唯一的区别是当节点的 parentNode 不是元素时.如果是这样，parentElement 为 null.
In most cases, it is the same as parentNode. The only difference comes when a node's parentNode is not an element. If so, parentElement is null.
举个例子:
document.body.parentNode; // the <html> element
document.body.parentElement; // the <html> element
document.documentElement.parentNode; // the document node
document.documentElement.parentElement; // null
(document.documentElement.parentNode === document); // true
(document.documentElement.parentElement === document); // false
由于 元素 (document.documentElement) 没有作为元素的父元素，parentElement 是 <代码>空.(还有其他更不可能的情况，其中 parentElement 可能是 null，但您可能永远不会遇到它们.)
Since the <html> element (document.documentElement) doesn't have a parent that is an element, parentElement is null. (There are other, more unlikely, cases where parentElement could be null, but you'll probably never come across them.)
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