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JavaScript can be added to HTML pages in three main ways: inline, internal, and external.
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Inline JavaScript is written directly inside an HTML element using event attributes like onclick.
<button onclick="alert('Hello!')">Click Me</button>
Internal JavaScript is written inside a <script> tag within the HTML file.
<!DOCTYPE html>
<html>
<head>
<title>Internal JS Example</title>
<script>
function greet() {
alert("Welcome!");
}
</script>
</head>
<body>
<button onclick="greet()">Greet Me</button>
</body>
</html>
External JavaScript is stored in a separate .js file and linked to the HTML using the src attribute.
HTML (index.html):
<!DOCTYPE html>
<html>
<head>
<title>External JS Example</title>
<script src="script.js"></script>
</head>
<body>
<button onclick="showMessage()">Click Me</button>
</body>
</html>function showMessage() {
alert("Hello!");
}Â