What is the difference between front-end BOM and DOM?

The differences are: 1. Different meanings, BOM refers to the browser object model, and DOM refers to the document object model; 2. Different structures, BOM is centered on the browser window, and the elements in the DOM document are represented as Nodes and organized according to a tree structure; 3. Different interaction methods, BOM interacts with JS through the Window object, and DOM interacts through nesting and references between objects; 4. Different application scopes, BOM is used for browser windows For interaction with the browser, DOM is used for the operation and interaction of document content; 5. Different development trends, etc.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

The BOM (Browser Object Model) and DOM (Document Object Model) in the front end are both objects used to operate browser windows and documents, but there are some differences between them.

1. Meaning:

   • BOM, the full name is Browser Object Model, which refers to the browser object model. It provides objects independent of any particular document, including browser windows, frames, history, locations, navigators, documents, scripts, and more. BOM allows JavaScript to interact with the browser window and its components, such as opening/closing the window, moving the window, changing the window size, etc.
   • DOM, the full name is Document Object Model, which refers to the document object model. It is a programming interface that represents structures in HTML or XML documents. DOM parses the document into a model composed of objects, such as windows, forms, links, pictures, etc. Each object has its own properties and methods, allowing JavaScript to dynamically change and interact with the document.

2. Structure:

   • The structure of BOM is mainly centered on the browser window, including some objects related to the browser window, such as windows Size, scrollbars, navigator, etc. It has no fixed structure and may vary from browser to browser.
   • The structure of DOM is a tree structure. The elements in the document are represented as nodes and organized according to the tree structure. Each node in the DOM tree is an object, with properties and methods. This structure makes it easy for JavaScript to manipulate the content and structure of the document.

3. Interaction method:

   • BOM mainly interacts with JavaScript through the Window object. The Window object provides many global functions and variables for access Browser windows and interacting with the browser. For example, window.open() is used to open a new browser window, window.location is used to obtain the URL of the current window, etc.
   • DOM interacts through nesting and references between objects. In the DOM, each element is an object with its own properties and methods. For example, document.getElementById() can obtain the element object with the specified ID, and then operate on the element through the methods and properties of the object.

4. Application scope:

   • BOM is mainly used for the interaction between the browser window and the browser, such as window size, scroll bar, navigator, etc. . It is not tied to any specific document, so it can be used in any web page.
   • DOM is mainly used for the operation and interaction of document content, such as modifying element content, adding/deleting nodes, getting/setting attributes, etc. It relies on a specific document, so it can only be used in browsers that parse HTML or XML documents.

5. development trend:

   • The development of BOM is relatively stable, mainly focusing on the implementation of some browser features and Web API, such as WebSocket, Geolocation, etc. Since the BOM is closely related to the browser, differences between different browsers may affect the compatibility of web applications. Therefore, you need to pay attention to browser compatibility issues during the development process.
   • The development of DOM is relatively active. With the development of Web technology and the update of standards, the functions of DOM are constantly expanding and improving. For example, DOM Level 2 and DOM Level 3 introduced many new features, including event handling, style sheet manipulation, animation, etc. In addition, with the development of Web component technology, new DOM features such as custom elements and Shadow DOM have gradually become widely used.

In short, BOM and DOM are two different concepts, used to operate the browser window and document content respectively. In actual development, they are usually used in combination to achieve richer web application functions.

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