JavaScript Program to display prompt for user to enter data

Program

<!DOCTYPE html>
<html>
<body>
<p>Click the button to demonstrate the prompt box.</p>
<button onclick="myFunction()">Display prompt</button>
<p id="demo"></p>
<script>
function myFunction() {
    var person = prompt("What is your name?", "Bill Gates");
    if (person != null) {
        document.getElementById("demo").innerHTML =
        "Welcome " + person + " to oodlescoop";
    }
}
</script>
</body>
</html>

Output

<p class="output">Click the button to demonstrate the prompt box.</p>
<button onclick="myFunction()">Display prompt</button>
<p id="demo"></p>
<script>
function myFunction() {
    var person = prompt(
        "What is your name?",
        "Bill Gates");
    if (person != null) {
        document.getElementById("demo").innerHTML = "Welcome " +
            person + " to oodlescoop";
    }
}
</script>