Document Object Model(DOMIs a cross-platform, language-independent convention that represents the objects in HTML, XHTML, and XML, and interacts with these objects.
DOM allows programs and scripts to dynamically access and update the content, structure, and style of a document. the document can be further processed by the DOM, and the processed results can be returned to the display page.
That is to say, through the Document Object Model, we have implemented a Model in which documents or pages contain objects (elements, links, and so on) and these objects can be manipulated. that is, you can add, delete, modify an element, modify the content of an element, or add, delete, or modify an attribute. you can get a list of all the H1 elements in the document, or all the elements that contain the attribute value CLASS = "foo.
Document Object Model
Http://en.wikipedia.org/wiki/Document_Object_Model
Document Object Model (DOM)
Http://www.w3.org/DOM/
Document Object Model FAQ
Http://www.w3.org/DOM/faq.html