JavaScript is a programming language that allows you to implement complex features on web pages. It enables interactive web applications and is an essential part of web development.
You can include JavaScript in your HTML documents in three ways: inline, internal, and external.
<button onclick="alert('Hello World!')">Click Me</button>
You can place JavaScript code within a <script> tag inside the <head> or <body> section of your HTML document.
<script>
console.log('Hello from internal script!');
</script>
For larger scripts, it’s best to place your JavaScript code in an external file and link to it using the <script> tag.
<script src="script.js"></script>
Variables store data values. In JavaScript, you can declare variables using var, let, or const.
let name = 'John'; // This variable can be changed
const age = 30; // This variable cannot be changed
JavaScript has several data types, including:
Functions are blocks of code designed to perform a particular task. You can define a function and call it when needed.
function greet() {
alert('Hello, World!');
}
greet(); // Calls the function
Create a simple webpage that includes a button. When the button is clicked, display an alert with a message of your choice. Use both inline and internal JavaScript in your code.