DOMImplementation 接口代表了一个对象，这个对象提供了不依赖于任何document的方法。这个对象可以通过Document.implementation属性获得
Property
这个接口没有特定的属性，并且也没有继承到任何属性。
Methods
没有继承的方法
DOMImplementation.createDocument()- Creates and returns an
XMLDocument. DOMImplementation.createDocumentType()- Creates and returns a
DocumentType. DOMImplementation.createHTMLDocument()- Creates and returns an HTML
Document. DOMImplementation.hasFeature()- Returns a
Booleanindicating if a given feature is supported or not. This function is unreliable and kept for compatibility purpose alone: except for SVG-related queries, it always returnstrue. Old browsers are very inconsistent in their behavior.
Specifications
| Specification | Status | Comment |
|---|---|---|
| DOM DOMImplementation |
Living Standard | Removed the getFeature() method.Added the createHTMLDocument() method.Modified the return type of createDocument() from Document to XMLDocument. |
| Document Object Model (DOM) Level 3 Core Specification DOMImplementation |
Recommendation | Added the getFeature() method (never implemented by any user agent). |
| Document Object Model (DOM) Level 2 Core Specification DOMImplementation |
Recommendation | Added the createDocument() and createDocumentType() methods. |
| Document Object Model (DOM) Level 1 Specification DOMImplementation |
Recommendation | Initial definition. |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 1.0 | 1.0 (1.7 or earlier) | 6.0 | (Yes) | (Yes) |
createHTMLDocument() |
(Yes) | 4.0 (2.0) | 9.0 | (Yes) | (Yes) |
createDocument() |
(Yes) | 1.0 (1.7 or earlier) | 9.0 | (Yes) | (Yes) |
hasFeature() |
(Yes) | 1.0 (1.7 or earlier) [1] | 6.0 | (Yes) | (Yes) |
createDocumentType() |
(Yes) | 1.0 (1.7 or earlier) | 9.0 | (Yes) | (Yes) |
| Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | (Yes) | 1.0 (1.0) | (Yes) | (Yes) | (Yes) |
createHTMLDocument() |
(Yes) | 4.0 (2.0) | (Yes) | (Yes) | (Yes) |
createDocument() |
(Yes) | 1.0 (1.0) | (Yes) | (Yes) | (Yes) |
hasFeature() |
(Yes) | 1.0 (1.0) | (Yes) | (Yes) | (Yes) |
createDocumentType() |
(Yes) | 1.0 (1.0) | (Yes) | (Yes) | (Yes) |
[1] Since Gecko 19, hasFeature() mostly returns true.