JS DOM Introduction
What is JS DOM Introduction?
JavaScript is the world's most popular programming language. It is the language of the web and can be used for both client-side and server-side development. JavaScript makes web pages interactive and dynamic.
Syntax & Usage
The syntax and usage patterns for JS DOM Introduction follow standard JavaScript conventions. Below you will see code examples that demonstrate the most common use cases. Try modifying these examples in your own editor to experiment with different approaches.
Example
Here is a practical example demonstrating JS DOM Introduction:
Tips & Best Practices
- Use
constby default,letwhen you need to reassign - Use strict equality (
===) instead of loose equality (==) - Handle errors with try/catch blocks for robust code
- Use template literals instead of string concatenation
Summary
In this lesson you learned about JS DOM Introduction. Practice writing code to reinforce these concepts and move on to the next lesson when you feel comfortable.
Examples
// Selecting elements
const title = document.getElementById('title');
const items = document.querySelectorAll('.item');
const first = document.querySelector('.item');
// Changing content
title.textContent = 'New Title';
title.innerHTML = '<em>New Title</em>';
// Changing styles
title.style.color = 'blue';
title.style.fontSize = '24px';
// Adding/removing classes
title.classList.add('active');
title.classList.remove('hidden');
title.classList.toggle('highlight');Test Your Knowledge
Take a quick quiz to check what you've learned in this lesson.