JavaScript DOM Tutorial for Beginners

JavaScript DOM教程 — Learn how to manipulate web pages with JavaScript DOM. Change content, handle events, create animations step by step.

Learn how to make your web pages interactive by mastering the Document Object Model (DOM) with JavaScript. This tutorial covers everything a beginner needs to know.

What is the DOM?

The Document Object Model (DOM) is a programming interface for HTML documents. It represents the page as a tree of objects that can be modified with JavaScript.

Selecting Elements

Use document.getElementById(), document.querySelector(), and document.querySelectorAll() to find elements on your page. These are your primary tools for DOM access.

Modifying Content

Change text with textContent and innerHTML. Update attributes with setAttribute(). Create new elements with createElement() and append them with appendChild().

Handling Events

Add interactivity with addEventListener(). Learn click, mouseover, keydown, and submit events. Event delegation helps manage many elements efficiently.

CSS Class Manipulation

Use classList.add(), classList.remove(), and classList.toggle() to dynamically change styles. This is cleaner than manipulating inline styles.

Working with Forms

Get and validate form values. Prevent default form submission with preventDefault(). Display error messages dynamically.

Creating Animations

Use requestAnimationFrame() for smooth animations. Combine with CSS transitions for performant visual effects.