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

Attr.prefix read-only property returns the namespace prefix of the specified attribute, or null if no prefix is specified.

Before DOM4 this API was defined within the 节点 接口。

句法

string = attribute.prefix
					

范例

The following logs "x" to the console.

<div x:id="example" onclick="console.log(this.attributes[0].prefix)"/>
					

注意事项

This will only work when a namespace-aware parser is used, i.e. when a document is served with an XML MIME type. This will not work for HTML documents.

规范

规范	状态	注释
DOM The definition of 'Attr: prefix' in that specification.	实时标准
DOM4 The definition of 'Attr.prefix' in that specification.	过时

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
prefix	Chrome 46 46 This API was previously available on the 节点 API。	Edge ≤18	Firefox 48 48 This API was previously available on the 节点 API。	IE No	Opera 33 33 This API was previously available on the 节点 API。	Safari 1.3	WebView Android 46 46 This API was previously available on the 节点 API。	Chrome Android 46 46 This API was previously available on the 节点 API。	Firefox Android 48 48 This API was previously available on the 节点 API。	Opera Android 33 33 This API was previously available on the 节点 API。	Safari iOS 1	Samsung Internet Android 5.0 5.0 This API was previously available on the 节点 API。

图例

完整支持

完整支持

不支持

不支持

见实现注意事项。

另请参阅

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

元数据

• 最后修改： Nov 30, 2019

相关话题

1. DOM (文档对象模型)
2. Attr
3. 特性

   1. localName
   2. namespaceURI
   3. prefix
4. 继承：

   1. 节点
   2. EventTarget
5. DOM 相关页面

   1. AbortController
   2. AbortSignal
   3. AbstractRange
   4. ByteString
   5. CDATASection
   6. CSSPrimitiveValue
   7. CSSValue
   8. CSSValueList
   9. CharacterData
   10. ChildNode
   11. 注释
   12. CustomEvent
   13. DOMConfiguration
   14. DOMError
   15. DOMErrorHandler
   16. DOMException
   17. DOMImplementation
   18. DOMImplementationList
   19. DOMImplementationRegistry
   20. DOMImplementationSource
   21. DOMLocator
   22. DOMObject
   23. DOMParser
   24. DOMPoint
   25. DOMPointInit
   26. DOMPointReadOnly
   27. DOMRect
   28. DOMString
   29. DOMTimeStamp
   30. DOMTokenList
   31. DOMUserData
   32. Document
   33. DocumentFragment
   34. DocumentType
   35. 元素
   36. ElementTraversal
   37. Entity
   38. EntityReference
   39. 事件
   40. EventTarget
   41. HTMLCollection
   42. MutationObserver
   43. 节点
   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