在此页

• 句法
• 范例
• 注意事项
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

过时
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

Node.namespaceURI read-only property returns the namespace URI of the node, or null if the node is not in a namespace. When the node is a document, it returns the XML namespace for the current document.

In DOM4 this API was moved from 节点 到 元素 and Attr 接口。

句法

namespace = node.namespaceURI
					

范例

In this snippet, a node is being examined for its Node.localName 及其 namespaceURI 。若 namespaceURI returns the XUL namespace and the localName returns "browser", then the node is understood to be a XUL <browser/> .

if (node.localName == "browser" &&
    node.namespaceURI == "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul") {
  // this is a XUL browser
}
					

注意事项

This is not a computed value that is the result of a namespace lookup based on an examination of the namespace declarations in scope. The namespace URI of a node is frozen at the node creation time.

In Firefox 3.5 and earlier, the namespace URI for HTML elements in HTML documents is null . In later versions, in compliance with HTML5, it is https://www.w3.org/1999/xhtml as in XHTML.

For nodes of any Node.nodeType 除了 ELEMENT_NODE and ATTRIBUTE_NODE the value of namespaceURI is always null .

You can create an element with the specified namespaceURI using the DOM Level 2 method Document.createElementNS and attributes with the method Element.setAttributeNS .

Per the Namespaces in XML specification, an attribute does not inherit its namespace from the element it is attached to. If an attribute is not explicitly given a namespace, it has no namespace.

The DOM does not handle or enforce namespace validation per se. It is up to the DOM application to do any validation necessary. Note too that the namespace prefix, once it is associated with a particular node, cannot be changed.

规范

规范	状态	注释
DOM (文档对象模型) 3 级核心规范 The definition of 'Node.namespaceURI' in that specification.	过时	Specifies the behavior when it's set to null .
DOM (文档对象模型) 级别 2 核心规范 The definition of 'DOM Level 2 Core: XML Namespaces' in that specification.	过时
DOM (文档对象模型) 级别 2 核心规范 The definition of 'Node.namespaceURI' in that specification.	过时	初始定义

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
namespaceURI 弃用 非标	Chrome 不支持 ? — 46 注意事项 ? — 46 注意事项 This API was moved to the 元素 and Attr APIs according to the DOM4 standard.	Edge 不支持 12 — 79 注意事项 12 — 79 注意事项 This API was moved to the 元素 and Attr APIs according to the DOM4 standard.	Firefox 不支持 1 — 48 注意事项 1 — 48 注意事项 This API was moved to the 元素 and Attr APIs according to the DOM4 standard.	IE ?	Opera ?	Safari ?	WebView Android 不支持 ? — 46 注意事项 ? — 46 注意事项 This API was moved to the 元素 and Attr APIs according to the DOM4 standard.	Chrome Android 不支持 ? — 46 注意事项 ? — 46 注意事项 This API was moved to the 元素 and Attr APIs according to the DOM4 standard.	Firefox Android 45	Opera Android Yes	Safari iOS Yes	Samsung Internet Android 不支持 ? — 5.0 注意事项 ? — 5.0 注意事项 This API was moved to the 元素 and Attr APIs according to the DOM4 standard.

图例

完整支持

完整支持

不支持

不支持

兼容性未知 ?

兼容性未知

非标。预期跨浏览器支持较差。

弃用。不要用于新网站。

弃用。不要用于新网站。

见实现注意事项。

另请参阅

• Node.localName
• Node.prefix
• Element.namespaceURI
• Attr.namespaceURI

元数据

• 最后修改： 2019 年 3 月 23 日

相关话题

1. DOM (文档对象模型)
2. 节点
3. 特性

   1. baseURI
   2. baseURIObject
   3. childNodes
   4. firstChild
   5. isConnected
   6. lastChild
   7. localName
   8. namespaceURI
   9. nextSibling
   10. nodeName
   11. nodePrincipal
   12. nodeType
   13. nodeValue
   14. outerText
   15. ownerDocument
   16. parentElement
   17. parentNode
   18. prefix
   19. previousSibling
   20. rootNode
   21. textContent
4. 方法

   1. appendChild()
   2. cloneNode()
   3. compareDocumentPosition()
   4. contains()
   5. getRootNode()
   6. getUserData()
   7. hasChildNodes()
   8. insertBefore()
   9. isDefaultNamespace()
   10. isEqualNode()
   11. isSameNode()
   12. isSupported()
   13. lookupNamespaceURI()
   14. lookupPrefix()
   15. normalize()
   16. removeChild()
   17. replaceChild()
   18. setUserData()
5. 继承：

   1. EventTarget
6. DOM 相关页面

   1. AbortController
   2. AbortSignal
   3. AbstractRange
   4. Attr
   5. ByteString
   6. CDATASection
   7. CSSPrimitiveValue
   8. CSSValue
   9. CSSValueList
   10. CharacterData
   11. ChildNode
   12. 注释
   13. CustomEvent
   14. DOMConfiguration
   15. DOMError
   16. DOMErrorHandler
   17. DOMException
   18. DOMImplementation
   19. DOMImplementationList
   20. DOMImplementationRegistry
   21. DOMImplementationSource
   22. DOMLocator
   23. DOMObject
   24. DOMParser
   25. DOMPoint
   26. DOMPointInit
   27. DOMPointReadOnly
   28. DOMRect
   29. DOMString
   30. DOMTimeStamp
   31. DOMTokenList
   32. DOMUserData
   33. Document
   34. DocumentFragment
   35. DocumentType
   36. 元素
   37. ElementTraversal
   38. Entity
   39. EntityReference
   40. 事件
   41. EventTarget
   42. HTMLCollection
   43. MutationObserver
   44. NodeFilter
   45. NodeIterator
   46. NodeList
   47. NonDocumentTypeChildNode
   48. ProcessingInstruction
   49. PromiseResolver
   50. 范围
   51. StaticRange
   52. 文本
   53. TextDecoder
   54. TextEncoder
   55. TimeRanges
   56. TreeWalker
   57. TypeInfo
   58. USVString
   59. UserDataHandler
   60. XMLDocument