What are the main functions of BOM and DOM

The main function of BOM is to provide a set of interfaces independent of any specific web page, allowing JavaScript programs to interact with the browser and implement various operations on the browser window. Its core is the Window object, which is Container for all global JavaScript objects. The main function of DOM is to parse the document into an object structure, provide a set of standard programming interfaces, and enable JavaScript programs to dynamically access and modify the document content, structure and style, as well as handle browser events.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

BOM (Browser Object Model) and DOM (Document Object Model) are two very important concepts in JavaScript. Their main functions are as follows:

1. The main functions of BOM:

BOM, the browser object model, provides an object structure that is independent of content and can interact with the browser window. BOM consists of multiple objects, including browser windows, frames, documents, positioning, navigation, history, etc. BOM allows JavaScript programs to interact directly with the browser to implement various operations on the browser window, such as opening a new window, closing a window, changing the window size, navigating to a new URL, etc.

The core of BOM is the Window object, which is the container of all global JavaScript objects. The Window object represents a browser window or a browser tab. In addition to the Window object, the BOM also includes Location objects (used to get or set the URL of the window), Navigator objects (containing information about the browser), Screen objects (providing information about the client screen) and other objects.

In general, the main function of BOM is to provide a set of interfaces independent of any specific web page, allowing JavaScript programs to interact with the browser and implement various operations on the browser window.

2. The main role of DOM:

DOM, the Document Object Model, is a programming interface used to process HTML and XML documents in Web development. It parses the document into an object structure, allowing programs and scripts to dynamically access and update the document's content, structure, and style.

DOM treats the document as a tree structure, consisting of nodes and objects. Each node is an object, and each object has its own properties and methods. Through the DOM, JavaScript can read and modify elements, attributes, and styles in HTML documents, as well as create and modify the document structure. For example, you can dynamically add or delete nodes, modify element content and attributes, apply or change CSS styles, etc. through the DOM.

In addition to accessing and modifying document content, DOM also provides an event handling mechanism that allows JavaScript programs to respond to browser events (such as clicks, mouse movements, keyboard input, etc.). Event handlers allow you to dynamically change document content or perform other operations.

In general, the main function of DOM is to parse the document into an object structure and provide a set of standard programming interfaces so that JavaScript programs can dynamically access and modify the document content, structure and style, and process Browser events.

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