Parse the description of DHTML, JavaScript, DOM, BOM and WEB standards_Basic knowledge

DHTML:It is not a new language, but the product of the combination of HTML, CSS and Javascript. DHTML includes the following 3 meanings:
(1) Mark the web page into various elements through HTML
(2) Use CSS to design the layout style between elements and control the position of each tag
(3) Use js to control Each tag
Javascript consists of three parts:

(1) ECMAScript is a scripting programming language standardized by the European Computer Manufacturers Association (ECMA) through ECMA-262. ECMAScript defines all
features, objects and methods of a scripting language, and other languages ​​can implement ECMAscipt as a baseline for their functionality. ECMAscript includes Javascript, ActionScript and ScriptEase
(2) DOM, which is an interface independent of browser, platform and language, allowing users to access other standard components of the page. DOM resolves the conflict between Netscape and Microsoft,
providing a standard method for Web developers to conveniently access data, scripts and presentation layer objects in the site.
(3) BOM, which can access and operate the browser window. Using BOM technology, web developers can move the window, change the status bar and perform some operations unrelated to the page content.
It The characteristics are as follows:
Pop up a new browser window, move to close the browser window and adjust the window size
Navigation object that provides web browser related information;
Positioning object that provides page details
Screen object that provides detailed parameters of screen resolution
Supports COOKIE
Some features of various browsers, such as IE’s ActivitX, etc.
Web standards are not a single standard, but a collection of a series of standards. A web page is mainly composed of three parts: Structure, Presentation and Behavior. The corresponding standards are also divided into three
Aspects: structured standard languages, including XML and XHTML; performance standard languages, mainly including CSS; behavioral standards, mainly including object model DOM, ECMAScript, etc.