FOM 参考 > DOM Support > DOM > DOMImplementation interface
DOMImplementation interface
The DOMImplementation interface provides a number of methods for performing operations that are independent of any particular instance of the document object model.
createDocument method
Creates an XML Document object of the specified type with its document element. HTML-only DOM implementations do not need to implement this method.
createDocument namespaceURI qualifiedName doctype
Parameters
String namespaceURI
The namespace URI of the document element to create.
String qualifiedName
The qualified name of the document element to be created.
DocumentType doctype
The type of document to be created or null.
When doctype is not null, its Node.ownerDocument attribute is set to the document being created.
Returns
Document. A new Document object.
Throws
DOMException
INVALID_CHARACTER_ERR: Raised if the specified qualified name contains an illegal character.
NAMESPACE_ERR: Raised if the qualifiedName is malformed, if the qualifiedName has a prefix and the namespaceURI is null, or if the qualifiedName has a prefix that is "xml" and the namespaceURI is different from the xml namespace [XML Namespaces].
WRONG_DOCUMENT_ERR: Raised if doctype has already been used with a different document or was created from a different implementation.
createDocumentType method
Creates an empty DocumentType node. Entity declarations and notations are not made available. Entity reference expansions and default attribute additions do not occur. It is expected that a future version of the DOM will provide a way for populating a DocumentType.
HTML-only DOM implementations do not need to implement this method.
createDocumentType qualifiedName publicId systemId
Parameters
String qualifiedName
The qualified name of the document type to be created.
String publicId
The external subset public identifier.
String systemId
The external subset system identifier.
Returns
DocumentType. A new DocumentType node with Node.ownerDocument set to null.
Throws
DOMException
INVALID_CHARACTER_ERR: Raised if the specified qualified name contains an illegal character.
NAMESPACE_ERR: Raised if the qualifiedName is malformed.
hasFeature method
Test if the DOM implementation implements a specific feature.
hasFeature feature version
Parameters
String feature
The name of the feature to test (case-insensitive). The values used by DOM features are defined throughout the DOM Level 2 specifications and listed in the section. The name must be an XML name. To avoid possible conflicts, as a convention, names referring to features defined outside the DOM specification should be made unique by reversing the name of the Internet domain name of the person (or the organization that the person belongs to) who defines the feature, component by component, and using this as a prefix. For instance, the W3C SVG Working Group defines the feature "org.w3c.dom.svg".
String version
This is the version number of the feature to test. In Level 2, the string can be either "2.0" or "1.0". If the version is not specified, supporting any version of the feature causes the method to return true.
Returns
trueboolean. if the feature is implemented in the specified version, false otherwise.
Parent topic 
DOM
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