​x
 
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>JavaScript Function Example</title>
    <script src="script.js"></script>
</head>
<body>
    <button onclick="greet('Alice')">Greet</button>
</body>
</html>
​
<script>
function greet(name) {
    alert("Hello, " + name + "!");
}
</script>