ParentNode

ParentNode 混合了所有(拥有子元素的) Node 对象包含的共有方法和属性。

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.childElementCount 只读
返回一个当前 ParentNode 所含有的后代数量。
ParentNode.children 只读
返回一个包含 ParentNode 所有后代 Element 对象的动态 HTMLCollection 对象，忽略所有非元素子节点。
ParentNode.firstElementChild 只读
返回父节点的第一个 Element 后代，没有时返回 null。
ParentNode.lastElementChild 只读
返回父节点的最后一个 Element 后代，没有时返回 null。

方法

ParentNode.append()
在父节点 ParentNode 的最后一个后代后面插入一组 Node 对象或 DOMString 对象。DOMString 对象会以同等的 Text 节点插入。
ParentNode.prepend()
在父节点 ParentNode 第一个后代前插入一组 Node 对象或者 DOMString 对象。DOMString 对象会以同等的 Text 节点插入。
ParentNode.querySelector()
返回以当前元素为根元素，匹配给定选择器的第一个元素 Element。
ParentNode.querySelectorAll()
返回一个 NodeList，表示以当前元素为根元素的匹配给定选择器组的元素列表。

规范

规范 状态 备注
DOM
ParentNode		 Living Standard Split the ElementTraversal interface into ChildNode and ParentNode. The ParentNode.firstElementChild, ParentNode.lastElementChild, and ParentNode.childElementCount properties are now defined on the latter. Added the ParentNode.children property, and the ParentNode.querySelector(), ParentNode.querySelectorAll(), ParentNode.append(), and ParentNode.prepend() methods.
Element Traversal Specification
ElementTraversal		 Obsolete Added the initial definition of its properties to the ElementTraversal pure interface and used it on Element.

浏览器兼容性

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
ParentNodeChrome Full support 1Edge Full support 12Firefox Full support 3.5IE Full support 9Opera Full support 10Safari Full support 4WebView Android Full support YesChrome Android Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes
append
Experimental
Chrome Full support 54Edge Full support 17Firefox Full support 49IE No support NoOpera Full support 39Safari Full support 10WebView Android Full support 54Chrome Android Full support 54Firefox Android Full support 49Opera Android Full support 41Safari iOS Full support 10Samsung Internet Android Full support 6.0
childElementCountChrome Full support 1Edge Full support 12Firefox Full support 3.5IE Full support 9Opera Full support 10Safari Full support 4WebView Android Full support YesChrome Android Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes
childrenChrome Full support 1Edge Full support 12Firefox Full support 3.5IE Full support 9
Notes
Full support 9
Notes
Notes Internet Explorer 6, 7 and 8 supported it, but erroneously includes Comment nodes.
Opera Full support 10Safari Full support 4WebView Android Full support 1Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support 10.1Safari iOS Full support 9Samsung Internet Android Full support 1.0
Support on Document and DocumentFragment
Experimental
Chrome Full support 29Edge Full support ≤79Firefox Full support 25IE No support NoOpera Full support 16Safari No support NoWebView Android Full support YesChrome Android Full support YesFirefox Android ? Opera Android ? Safari iOS No support NoSamsung Internet Android Full support Yes
firstElementChildChrome Full support 1Edge Full support 12Firefox Full support 3.5IE Full support 9Opera Full support 10Safari Full support 4WebView Android Full support YesChrome Android Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes
lastElementChildChrome Full support 1Edge Full support 12Firefox Full support 3.5IE Full support 9Opera Full support 10Safari Full support 4WebView Android Full support YesChrome Android Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes
prepend
Experimental
Chrome Full support 54Edge Full support 17Firefox Full support 49IE No support NoOpera Full support 39Safari Full support 10WebView Android Full support 54Chrome Android Full support 54Firefox Android Full support 49Opera Android Full support 41Safari iOS Full support 10Samsung Internet Android Full support 6.0
querySelectorChrome Full support 1Edge Full support 12Firefox Full support 3.5IE Full support 9
Notes
Full support 9
Notes
Notes Internet Explorer 8 only supported CSS2 selectors.
Opera Full support 10Safari Full support 4WebView Android Full support ≤37Chrome Android Full support 18Firefox Android Full support YesOpera Android Full support 10.1Safari iOS Full support 3.2Samsung Internet Android Full support Yes
querySelectorAllChrome Full support 1Edge Full support 12Firefox Full support 3.5IE Full support 9
Notes
Full support 9
Notes
Notes Internet Explorer 8 only supported CSS2 selectors.
Opera Full support 10Safari Full support 4WebView Android Full support YesChrome Android Full support YesFirefox Android Full support YesOpera Android Full support 10.1Safari iOS Full support 3.2Samsung Internet Android Full support Yes
replaceChildren
Experimental
Chrome No support NoEdge No support NoFirefox Full support 78IE No support NoOpera No support NoSafari Full support 14WebView Android No support NoChrome Android No support NoFirefox Android No support NoOpera Android No support NoSafari iOS Full support 14Samsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
See implementation notes.
See implementation notes.

参见