What is the use of learning BOM and DOM?

The role of learning BOM and DOM: 1. Learning BOM can help developers control and operate browser windows; 2. Learning DOM can help developers operate and control various elements of web pages; 3. Learning BOM and DOM It can also improve the performance and efficiency of web pages; 4. Learning BOM and DOM can also improve the accessibility and maintainability of web pages. Learning BOM and DOM is very important for web developers. They provide a rich set of tools and technologies that can improve user experience, enhance the interactivity of web pages, and make web pages more dynamic and actionable.

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

BOM (Browser Object Model) and DOM (Document Object Model) are two concepts closely related to web development. BOM refers to a set of JavaScript objects provided by the browser for manipulating browser windows and frames. DOM refers to the structured representation of a web page, through which each element of the web page can be accessed and manipulated.

Learning BOM and DOM is very important for web developers because they provide powerful tools and techniques that can improve user experience, enhance the interactivity of web pages, and make web pages more dynamic and operable.

First of all, learning BOM can help developers control and operate browser windows. The BOM provides some useful objects, such as the window object, which can be used to manage the size and position of the browser window, as well as operations related to the browser window, such as opening a new window, closing the window, refreshing the window, etc. In addition, the BOM also provides some objects related to user interaction. For example, the location object can obtain and set the URL of the current page, and the history object can manage the browser's history, allowing users to easily perform forward and backward operations.

Secondly, learning DOM can help developers operate and control various elements of web pages. DOM provides a structured way to represent web pages. Through DOM, developers can access and manipulate HTML elements, modify the style of elements, add and delete elements, etc. DOM also provides a set of event handlers that allow developers to respond to user operations, such as clicks, mouse movements, keyboard input, etc. Through DOM, developers can achieve various interactive effects, such as form validation, dynamically loading content, responding to user operations, etc.

Learning BOM and DOM can also improve the performance and efficiency of web pages. By rationally using the related methods and attributes of BOM and DOM, developers can optimize the loading speed of web pages, reduce page response time, and improve user experience. For example, by using BOM's preloading technology, relevant resources can be preloaded before users access the webpage, reducing loading time; by using DOM's event delegation technology, the number of event handlers can be reduced and the response speed of the webpage can be improved; by using DOM The method of dynamically creating and deleting elements can reduce the size of web pages and improve loading speed.

In addition, learning BOM and DOM can also improve the accessibility and maintainability of web pages. By properly organizing and managing BOM and DOM related codes, developers can make web pages easier to maintain and expand. For example, by encapsulating related code into functions and objects, the reusability and maintainability of the code can be improved; by using good naming conventions and comments, the code can be made easier to understand and maintain; by using some specifications and tools, such as ESLint and Prettier, which can improve the quality and consistency of your code.

In summary, learning BOM and DOM is very important for web developers. They provide a rich set of tools and technologies that can improve user experience, enhance the interactivity of web pages, and make web pages more dynamic and actionable. By rationally using BOM and DOM, developers can achieve various functions and effects, improve the performance and efficiency of web pages, and enhance the accessibility and maintainability of web pages. Therefore, learning BOM and DOM is an important skill that every web developer should master.

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