在此页

• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

TreeWalker.root read-only property returns the node that is the root of what the TreeWalker traverses.

句法

root = TreeWalker.root;
					

范例

var treeWalker = document.createTreeWalker(
    document.body,
    NodeFilter.SHOW_ELEMENT,
    { acceptNode: function(node) { return NodeFilter.FILTER_ACCEPT; } },
    false
);
root = treeWalker.root; // document.body in this case
					

规范

规范	状态	注释
DOM The definition of 'TreeWalker.root' in that specification.	实时标准	无变化自 Document Object Model (DOM) Level 2 Traversal and Range Specification
Document Object Model (DOM) Level 2 Traversal and Range Specification The definition of 'TreeWalker.root' 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
root	Chrome 1	Edge 12	Firefox 4	IE 9	Opera 9	Safari 3	WebView Android 3	Chrome Android Yes	Firefox Android 4	Opera Android 10.1	Safari iOS 3	Samsung Internet Android Yes

图例

完整支持

完整支持

另请参阅

• TreeWalker 接口。

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. TreeWalker
3. 特性

   1. currentNode
   2. expandEntityReferences
   3. filter
   4. root
   5. whatToShow
4. 方法

   1. firstChild()
   2. lastChild()
   3. nextNode()
   4. nextSibling()
   5. parentNode()
   6. previousNode()
   7. previousSibling()
5. 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. 节点
   45. NodeFilter
   46. NodeIterator
   47. NodeList
   48. NonDocumentTypeChildNode
   49. ProcessingInstruction
   50. PromiseResolver
   51. 范围
   52. StaticRange
   53. 文本
   54. TextDecoder
   55. TextEncoder
   56. TimeRanges
   57. TypeInfo
   58. USVString
   59. UserDataHandler
   60. XMLDocument