What are dom and bom in the program?

The dom and bom in the program refer to: 1. DOM "Document Object Model". The core is the DOM tree, which is composed of nodes "Node", including element nodes, text nodes, attribute nodes, etc., through DOM, Developers can use scripting language to modify, delete, add or replace elements and content on web pages; 2. BOM "Browser Object Model" represents the relationship between browser windows and pages. BOM objects provide a series of information related to browsing. Properties and methods related to browser windows and pages allow developers to control browser behavior.

# Operating system for this tutorial: Window10 system, Dell G3 computer.

DOM (Document Object Model) and BOM (Browser Object Model) are two common concepts in Web development.

1. DOM (Document Object Model):
   DOM refers to a standardized way to represent and manipulate web content through HTML or XML documents. It parses the web page document into a tree structure, through which various elements in the web page can be accessed and manipulated. DOM provides a set of APIs that can manipulate the properties, styles, and content of web page elements through programming languages ​​such as JavaScript to achieve dynamic web page effects and interactions.

The core of DOM is the DOM tree, which is composed of nodes (Node), including element nodes, text nodes, attribute nodes, etc. Through the DOM, developers can use scripting languages ​​to modify, delete, add, or replace elements and content on web pages.

2. BOM (Browser Object Model):
   BOM refers to the object model provided by the browser, which represents the relationship between the browser window and the page. The BOM object provides a series of properties and methods related to browser windows and pages, allowing developers to control the behavior of the browser, obtain the size of the browser window, process user input, etc.

BOM contains some common objects, such as window, navigator, location, history, etc. Through BOM objects, developers can obtain and set the size and position of the browser window, obtain the user's browser information, and control URL jumps and history records, etc.

In summary, DOM is used to manipulate the HTML or XML document structure of web pages, providing access and operations to web page elements through a tree structure; while BOM provides objects and objects related to browser windows and pages. Methods used to control browser behavior and obtain browser information. These two together constitute the most important part of Web development.

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