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NamedNodeMap

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NamedNodeMap 介面表示了 Attr 物件的集合。雖然 NamedNodeMap 與 NodeList 都能如陣列一般透過索引訪問成員,但和 NodeList 不同的是,NamedNodeMap 中的成員並沒有順序。

NamedNodeMap 物件具有即時性(live),如果其內部成員(屬性節點物件)發生改變,NamedNodeMap 物件會自動更新至最新的狀態。

僅管被稱作 NamedNodeMap,但本介面並不是直接用來處理節點物件(Node),而是專門負責屬性節點物件(Attr)。屬性節點是一種特殊的節點,在部分瀏覽器實作中依然存在。

屬性

This interface doesn't inherit any property.

NamedNodeMap.length Read only
Returns the amount of objects in the map.

方法

This interface doesn't inherit any method.

NamedNodeMap.getNamedItem()
Returns a Attr, corresponding to the given name.
NamedNodeMap.setNamedItem()
Replaces, or adds, the Attr identified in the map by the given name.
NamedNodeMap.removeNamedItem()
Removes the Attr identified by the given map.
NamedNodeMap.item()
Returns the Attr at the given index, or null if the index is higher or equal to the number of nodes.
NamedNodeMap.getNamedItemNS()
Returns a Attr identified by a namespace and related local name.
NamedNodeMap.setNamedItemNS()
Replaces, or adds, the Attr identified in the map by the given namespace and related local name.
NamedNodeMap.removeNamedItemNS()
Removes the Attr identified by the given namespace and related local name.

規範

Specification Status Comment
DOM
The definition of 'NamedNodeMap' in that specification.
Living Standard Deals with Attr instead of Node
Document Object Model (DOM) Level 3 Core Specification
The definition of 'NamedNodeMap' in that specification.
Recommendation No change from Document Object Model (DOM) Level 2 Core Specification
Document Object Model (DOM) Level 2 Core Specification
The definition of 'NamedNodeMap' in that specification.
Recommendation Added getNamedItemNS(), setNamedItemNS() and removeNamedItemNS()
Document Object Model (DOM) Level 1 Specification
The definition of 'NamedNodeMap' in that specification.
Recommendation Initial definition

瀏覽器相容性

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)
Deals with Attr rather than Node ? ? 22 (22)[1] ? ? ?
Feature Android Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)
Deals with Attr rather than Node ? ? 22.0 (22)[1] ? ? ?

[1] In Gecko 22 this interface was named mozNamedAttrMap. In Gecko 34 it was named back to NamedNodeMap.

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