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TreeWalker 对象表示一个当前文档的子树中的所有节点及其位置。

可以使用Document.createTreeWalker() 方法创建一个TreeWalker。

属性

本接口未继承任何属性

TreeWalker.root 只读
返回一个 Node 表示创建时所使用的根节点。
TreeWalker.whatToShow 只读
Returns an unsigned long being a bitmask made of constants describing the types of Node that must to be presented. Non-matching nodes are skipped, but their children may be included, if relevant. The possible values are:
Constant 数值 描述
NodeFilter.SHOW_ALL -1 (that is the max value of unsigned long) 显示所有节点
NodeFilter.SHOW_ATTRIBUTE 2 Shows attribute Attr nodes. This is meaningful only when creating a TreeWalker with an Attr node as its root; in this case, it means that the attribute node will appear in the first position of the iteration or traversal. Since attributes are never children of other nodes, they do not appear when traversing over the document tree.
NodeFilter.SHOW_CDATA_SECTION 8 Shows CDATASection nodes.
NodeFilter.SHOW_COMMENT 128 Shows Comment nodes.
NodeFilter.SHOW_DOCUMENT 256 Shows Document nodes.
NodeFilter.SHOW_DOCUMENT_FRAGMENT 1024 Shows DocumentFragment nodes.
NodeFilter.SHOW_DOCUMENT_TYPE 512 Shows DocumentType nodes.
NodeFilter.SHOW_ELEMENT 1 Shows Element nodes.
NodeFilter.SHOW_ENTITY 32 Shows Entity nodes. This is meaningful only when creating a TreeWalker with an Entity node as its root; in this case, it means that the Entity node will appear in the first position of the traversal. Since entities are not part of the document tree, they do not appear when traversing over the document tree.
NodeFilter.SHOW_ENTITY_REFERENCE 16 Shows EntityReference nodes.
NodeFilter.SHOW_NOTATION 2048 Shows Notation nodes. This is meaningful only when creating a TreeWalker with a Notation node as its root; in this case, it means that the Notation node will appear in the first position of the traversal. Since entities are not part of the document tree, they do not appear when traversing over the document tree.
NodeFilter.SHOW_PROCESSING_INSTRUCTION 64 Shows ProcessingInstruction nodes.
NodeFilter.SHOW_TEXT 4 Shows Text nodes.
TreeWalker.filter 只读
根据不同的 节点过滤器返回 相关节点.
TreeWalker.expandEntityReferences 只读
Is a Boolean indicating if, when discarding an EntityReference its whole sub-tree must be discarded at the same time.
TreeWalker.currentNode
任何遍历方法在上一次遍历中返回的节点 .

方法

此接口不继承任何方法。

注意:TreeWalker只遍历可显示元素。

TreeWalker.parentNode()
遍历到当前 节点的父节点, 并返回. It also moves the current node to this one. If no such node exists, or if it is before that the root node defined at the object construction, returns null and the current node is not changed.
TreeWalker.firstChild()
遍历到当前 节点的第一个子节点, 并返回. It also moves the current node to this child. If no such child exists, returns null and the current node is not changed.
TreeWalker.lastChild()
遍历到当前 节点的最后一个子节点, 并返回. It also moves the current node to this child. If no such child exists, returns null and the current node is not changed.
TreeWalker.previousSibling()
遍历到当前 节点的前一个兄弟节点, 并返回. If there is no such node, return null and the current node is not changed.
TreeWalker.nextSibling()
遍历到当前 节点的后一个兄弟节点, 并返回.. If there is no such node, return null and the current node is not changed.
TreeWalker.previousNode()
Moves the current Node to the previous visible node in the document order, and returns the found node. It also moves the current node to this one. If no such node exists,or if it is before that the root node defined at the object construction, returns null and the current node is not changed.
TreeWalker.nextNode()
Moves the current Node to the next visible node in the document order, and returns the found node. It also moves the current node to this one. If no such node exists, returns null and the current node is not changed.

Specifications

Specification Status Comment
DOM
TreeWalker
Living Standard Removed the expandEntityReferences property.
Document Object Model (DOM) Level 2 Traversal and Range Specification
TreeWalker
Recommendation Initial definition.

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Basic support 1.0 (Yes) 2.0 (1.8.1) 9.0 9.0 3.0
Feature Android Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) 1.0 (1.8.1) (Yes) 9.0 3.0

See also

文档标签和贡献者

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