JavaScript Program to Show Alert Message on Button Click

Write a JavaScript program to show alert message on button click.

Source Code

<html>

<head>
    <title>JavaScript event example</title>
    <script type="text/javascript">
        function sayHello() {
            alert("Hello World!")
        }
    </script>
</head>

<body>
    <p>Click the button to see result</p>
    <form>
        <input type="button" onclick="sayHello()" value="Say Hello" />
    </form>
</body>

</html>

Output

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