dom does not belong to JavaScript

DOM does not belong to JavaScript itself, but DOM is a very important part of JavaScript and plays a vital role in the application of JavaScript in web development. In this article, we’ll take a deep dive into the DOM to learn what it is, what it does, how to manage the DOM, and why the DOM is so important to JavaScript development.

What is DOM

In Web development, the Document Object Model (DOM) is an API (Application Programming Interface) that represents HTML and XML documents as a tree structure. ). The DOM defines a standard way to access a document's elements and attributes, which can be manipulated through JavaScript and other programming languages.

The role of DOM

DOM allows JavaScript to query and modify elements and content in HTML and XML documents through APIs. Using the DOM, web developers can dynamically create, modify, and delete elements and content of web pages. For example, the following functions can be achieved through DOM:

• Change text and style - dynamically modify text content, color, font and other style features.
• Manipulate HTML elements - dynamically create, insert and delete HTML elements, such as adding or deleting navigation menus or form elements, or dynamically adjusting pictures or styles.
• Manipulate DOM attributes - dynamically get and set the attributes of elements, such as getting the text of an input box or setting the default value of a text input box.
• Response to user interaction - monitor user behavior on the page through event listeners, such as clicking or scrolling the page.

How to manage DOM

In JavaScript, DOM is linked to HTML documents as a JavaScript object model. Each element in the document has a corresponding JavaScript object, and this JavaScript object can be queried and operated through the API.

When using DOM, you need to pay attention to the following points:

• DOM query - when querying DOM elements, obtain them through tag names, IDs, CSS selectors and attributes, etc. A reference to the element.
• Manipulate DOM elements - Once you have obtained a reference to a DOM element, use the API to manipulate the DOM element, such as changing the element's text, color, or creating a new element.
• DOM events - use JavaScript to listen to DOM events, such as click, scroll, drag, etc.
• Performance optimization - DOM operations may affect code performance, so DOM operations need to be optimized.

Why DOM is so important to JavaScript development

The emergence of DOM has made JavaScript more powerful in Web development, allowing Web applications to be more dynamic and interactive. Modern web applications often require extensive DOM manipulation, so it is important for web developers to be proficient in DOM manipulation.

Summary

In this article, we discussed the role, management and importance of DOM to JavaScript development. Although the DOM does not belong to the JavaScript language itself, it plays a huge role in web development and promotes the development of the JavaScript language. Mastering the skill of DOM manipulation is one of the important skills that all web developers must have.

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