JavaScript Program to display confirm box

Program

<!DOCTYPE html>
<html>
<body>

<p>Click the button to display a confirm box.</p>
<button onclick="myFunction()">Display Confirm</button>
<p id="demo"></p>

<script>
function myFunction() {
    var x;
    if (confirm("Press a button!") == true) {
        x = "You pressed OK!";
    } else {
        x = "You pressed Cancel!";
    }
    document.getElementById("demo").innerHTML = x;
}
</script>

</body>
</html>

Output

Click the button to display a confirm box.