What is JavaScript?
JavaScript is a scripting language that makes web pages interactive and dynamic. It allows you to add functionality to your website without having to reload the entire page...
Why Use JavaScript?
- Dynamic Websites: JavaScript makes your website more responsive and user-friendly.
- Client-Side Validation: JavaScript can validate user inputs before submitting them to the server, preventing errors.
- Ajax Calls: JavaScript can send requests to the server without reloading the page, making your website more responsive and efficient.
- Game Development: JavaScript is used in many online and mobile games.
Key Concepts
- Scripting Language: JavaScript is interpreted at runtime, making it easier to develop and debug.
- Dynamic Language: JavaScript allows you to change the behavior of your website based on user interactions.
- Client-Side: JavaScript runs in the user's browser, allowing you to control the user's experience without involving the server.
- Server-Side: JavaScript can also run on the server, using frameworks like Node.js.
Simple JavaScript Example
const name = 'Alex';
function greet() {
console.log(`Hello, ${name}!`);
}
greet();
Output:
Hello, Alex!
This example demonstrates:
- Variables:
name stores the user's name.
- Functions:
greet is a function that prints a greeting.
- Invocation: The
greet function is called to display the greeting.