在此页

• 句法
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

弃用
This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the 兼容性表格 at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

DOMImplementation.hasFeature() 方法返回 布尔 flag indicating if a given feature is supported. It is deprecated and modern browsers return true in all cases.

The different implementations fairly diverged in what kind of features were reported. The latest version of the spec settled to force this method to always return true , where the functionality was accurate and in use.

句法

const flag = document.implementation.hasFeature(feature, version);
					

参数

feature

DOMString representing the feature name.

version

DOMString representing the version of the specification defining the feature.

规范

规范	状态	注释
DOM The definition of 'DOMImplementation.hasFeature' in that specification.	实时标准	Modified to always return true except for SVG features.
DOM (文档对象模型) 3 级核心规范 The definition of 'DOMImplementation.hasFeature' in that specification.	过时	无变化自 DOM (文档对象模型) 级别 2 核心规范
DOM (文档对象模型) 级别 2 核心规范 The definition of 'DOMImplementation.hasFeature' in that specification.	过时	无变化自 DOM (文档对象模型) 1 级规范
DOM (文档对象模型) 1 级规范 The definition of 'DOMImplementation.hasFeature' in that specification.	过时	初始定义。

浏览器兼容性

The compatibility table in 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
hasFeature 弃用	Chrome Yes	Edge 12	Firefox Yes Yes Since Firefox 19, hasFeature() mostly returns true .	IE 6	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android Yes	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes

图例

完整支持

完整支持

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

• DOMImplementation interface it belongs to.

元数据

• 最后修改： Aug 8, 2020

相关话题

1. DOM (文档对象模型)
2. DOMImplementation
3. 方法

   1. createDocument()
   2. createDocumentType()
   3. createHTMLDocument()
   4. hasFeature()
4. 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. 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