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Node.nodeType - Web APIs 编辑

The read-only Node.nodeType property is an integer that identifies what the node is. It distinguishes different kind of nodes from each other, such as elements, text and comments.

Syntax

var type = node.nodeType;

Returns an integer which specifies the type of the node. Possible values are listed in Node type constants.

Constants

Node type constants

Constant	Value	Description
`Node.ELEMENT_NODE`	`1`	An `Element` node like `<p>` or `<div>`.
`Node.ATTRIBUTE_NODE`	`2`	An `Attribute` of an `Element`.
`Node.TEXT_NODE`	`3`	The actual `Text` inside an `Element` or `Attr`.
`Node.CDATA_SECTION_NODE`	`4`	A `CDATASection`, such as `<!CDATA[[ … ]]>`.
`Node.PROCESSING_INSTRUCTION_NODE`	`7`	A `ProcessingInstruction` of an XML document, such as `<?xml-stylesheet … ?>`.
`Node.COMMENT_NODE`	`8`	A `Comment` node, such as `<!-- … -->`.
`Node.DOCUMENT_NODE`	`9`	A `Document` node.
`Node.DOCUMENT_TYPE_NODE`	`10`	A `DocumentType` node, such as `<!DOCTYPE html>`.
`Node.DOCUMENT_FRAGMENT_NODE`	`11`	A `DocumentFragment` node.

Deprecated node type constants This deprecated API should no longer be used, but will probably still work.

The following constants have been deprecated and should not be used anymore.

Constant	Value	Description
`Node.ENTITY_REFERENCE_NODE`	5	An XML Entity Reference node, such as `&foo;`. Removed in DOM4.
`Node.ENTITY_NODE`	6	An XML `<!ENTITY …>` node. Removed in DOM4.
`Node.NOTATION_NODE`	12	An XML `<!NOTATION …>` node. Removed in DOM4.

Examples

Different types of nodes

document.nodeType === Node.DOCUMENT_NODE; // true
document.doctype.nodeType === Node.DOCUMENT_TYPE_NODE; // true

document.createDocumentFragment().nodeType === Node.DOCUMENT_FRAGMENT_NODE; // true

var p = document.createElement("p");
p.textContent = "Once upon a time…";

p.nodeType === Node.ELEMENT_NODE; // true
p.firstChild.nodeType === Node.TEXT_NODE; // true

Comments

This example checks if the first node inside the document element is a comment, and displays a message if not.

var node = document.documentElement.firstChild;
if (node.nodeType !== Node.COMMENT_NODE) {
  console.warn("You should comment your code!");
}

Specifications

Specification	Status	Comment
DOM The definition of 'Node.nodeType' in that specification.	Living Standard	Deprecated `ATTRIBUTE_NODE`, `ENTITY_REFERENCE_NODE` and `NOTATION_NODE` types.
Document Object Model (DOM) Level 3 Core Specification The definition of 'Node.nodeType' in that specification.	Obsolete	No changes.
Document Object Model (DOM) Level 2 Core Specification The definition of 'Node.nodeType' in that specification.	Obsolete	No changes.
Document Object Model (DOM) Level 1 Specification The definition of 'Node.nodeType' in that specification.	Obsolete	Initial definition.