ParentNode

在本文章中

ParentNode mixin包含可以拥有子项的所有类型的 Node对象共有的方法和属性。

ParentNode 是一个原始接口，不能够创建这种类型的对象；它在 Element、Document 和 DocumentFragment 对象上被实现。

属性

ParentNode.children 只读: Returns a live HTMLCollection containing all objects of type Element that are children of this ParentNode.
ParentNode.firstElementChild 只读: Returns the Element that is the first child of this ParentNode, or null if there is none.
ParentNode.lastElementChild 只读: Returns the Element that is the last child of this ParentNode, or null if there is none.
ParentNode.childElementCount 只读: Returns an unsigned long giving the amount of children that the object has.

There is no inherited or specific and implemented methods.

Specification	Status	Comment
DOM ParentNode.firstElementChild	Living Standard	Splitted the `ElementTraversal` interface in `ChildNode` and `ParentNode`. The `firstElementChild`, `lastElementChild`, and `childElementCount` properties are now defined on the latter. The `Document` and `DocumentFragment` implemented the new interfaces. Added the `children` property. Added the `append()` and `prepend()` methods.
Element Traversal Specification ElementTraversal'	Recommendation	Added the initial definition of its properties to the `ElementTraversal` pure interface and use it on `Element`.

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support (on `Element`)	1.0	3.5 (1.9.1)	9.0 [1]	10.0	4.0
Support on `Document` and `DocumentFragment`	29.0	25.0 (25.0)	未实现	16.0	未实现
`append()` and `prepend()`	未实现	未实现	未实现	未实现	未实现

Feature	Android	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
Basic support (on `Element`)	(Yes)	1.0 (1.9.1)	(Yes)	(Yes)	(Yes)
Support on `Document` and `DocumentFragment`	(Yes)	25.0 (25.0)	未实现	16.0	未实现
`append()` and `prepend()`	未实现	未实现	未实现	未实现	未实现

[1] Internet Explorer 6, 7 and 8 supported it, but erroneously returns Comment nodes as part of the results.

另见