JavaScript Tutorial
JavaScript Getting Started
Run JavaScript in the browser console and inside a web page.
Concept
JavaScript can run directly in modern browsers. For quick experiments, use the developer console; for page behavior, use a script element or external .js file.
Keep JavaScript separate from presentation where practical. Browser scripts can read and change the DOM after the relevant elements exist.
Example
const message = "Hello JavaScript";
console.log(message);
Type the example yourself and change at least one value. Small experiments reveal syntax and behavior faster than passive reading.
Practice Tasks
- Open the browser console and print your name.
- Create an HTML file and load an external app.js file.
- Use console.log for three different value types.
Key Takeaways
- The browser includes a JavaScript engine.
- Developer tools are essential for debugging.
- External scripts keep code maintainable.