Parse DHTML, JavaScript, DOM, BOM, and WEB Standard descriptions

DHTML:It is not a new language, but a combination of HTML, CSS, and JavaScript. DHTML contains the following three meanings:
(1) Mark webpages as elements through HTML
(2) Use CSS to design typographical styles between elements and control the positions of each tag
(3) Use js to control various tags
JavaScript consists of three parts:


(1) ECMAScript is a scripting language standardized by the European Computer Manufacturers Association (ECMA) through ECMA-262. ECMAScript defines all
Features, objects, and methods can be implemented in other languages as the benchmark for their functions. ECMAscript includes JavaScript, ActionScript, and ScriptEase
(2) DOM is an interface unrelated to browsers, platforms, and languages, allowing users to access other standard components on the page. DOM resolves conflicts between Netscape and Microsoft,
Provides a standard method for Web developers to conveniently access data, scripts, and presentation layer objects on the site.
(3) BOM allows you to access and operate the browser window. With BOM technology, Web developers can move the window, change the status bar, and perform some operations irrelevant to the page content,
Its features are as follows:
Pop up a new browser window, move and close the browser window, and adjust the window size
Provides Navigation Objects for Web browser-related information;
Location object that provides page details
Screen objects that provide detailed screen resolution Parameters
Supports cookies
Some features of various browsers, such as ActivitX of IE.
Web standards are not a set of standards, but a collection of standards. webpages are mainly composed of three parts: Structure, Presentation, and Behivior ), the corresponding standards are also divided into three
Aspects: Structured standard language, including XML and XHTML; standard language of representation, including CSS; behavior standard, including object model DOM and ECMAScript.