DOM note (2): Node interface and dom note node interface

DOM note (2): Node interface and dom note node interface

All nodes are represented by the Node interface. You can use many methods to obtain nodes, such as document. getElementsByTagName (), document. getElementsByName () and so on all return a NodeList object, and then obtain the node.

The Node attributes and amplification are defined on the Node interface:

1. List of common Node interface attributes

Attribute name	Data Type	Description
NodeName	DOMString	Return node name
NodeValue	DOMString	Return node Value
NodeType	Int	Return node type (see the following section)
ParentNode	Node	Returns the parent node of the current node.
ChildNodes	NodeList	Returns all child nodes of the current node.
FirstChild	Node	Returns the first subnode of the current node.
LastChild	Node	Returns the last subnode of the current node.
Previussibling	Node	Returns the adjacent sibling node of the current node.
NextSibling	Node	Returns the next sibling node of the current node.
Attributes	NamedNodeMap	Returns all attributes of the current node.
OwnerDocument	Document	Returns the Document Object corresponding to the current node.
NamespaceURI	DOMString	Returns the URI Of The namespace to which the current node belongs.
Prefix	DOMString	Returns the prefix of the namespace to which the current node belongs.
LocalName	DOMString	Returns the local part of the specified name of the current node.

 

2. List of common methods of Node Interfaces

Method Name	Data Type	Description
AppendChild	Node	Add a subnode at the end
CloneNode	Node	Clone a subnode
HasAttributes	Boolean	Determines whether the node has attributes.
HasChildNodes	Boolean	Determine whether the node has subnodes
InsertBefore	Node	Insert a node into a specified Node
IsSupported	Boolean	Determine whether a node is supported
Normalize	Void	Normalized Node
RemoveChild	Node	Delete a subnode
ReplaceChild	Node	Replace a subnode

 

3. Node Type

In the DOM document, each Node belongs to a type. You can use the Node. nodeType attribute to obtain the Node type. The DOM specification specifies 12 Node types, which can be expressed by constants defined by the Node interface or by numbers.

Node type constant	Numeric representation	Description
ELEMENT_NODE	1	Element Node
ATTRIBUTE_NODE	2	Attribute node
TEXT_NODE	3	Text Node
CDATA_SECTION_NODE	4	CDATA Node
ENTITY_REFERENCE_NODE	5	Entity reference node
ENTITY_NODE	6	Entity Node
PROCESSING_INSTRUCTION_NODE	7	Processing Command Node
COMMENT_NODE	8	Comment nodes
DOCUMENT_NODE	9	Document Node
DOCUMENT_TYPE_NODE	10	Document Type Node
DOCUMENT_FRAGMENT_NODE	11	Document fragment Node
NOTATION_NODE	12	Symbol Node

 

PS: IE does not support constant representation. It is best to use numbers for representation. The six most common Node types: 1, 2, 3, 8, 9, 11

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