JavaScript Program to push and pop elements from an array

Program

<!DOCTYPE html>
<html>
    <head>
        <title>
            Push and Pop from Array
        </title>
        <script>
            var cars = ["Ferrari", "Lamborghini", "Porsche", "Mercedes"];
            document.getElementById("demo").innerHTML = cars;
            function display() {
                document.getElementById("demo").innerHTML = cars;
            }
            function pushArray() {
                cars.push("BMW");
                document.getElementById("demo").innerHTML = cars;
            }
            function popArray() {
                cars.pop();
                document.getElementById("demo").innerHTML = cars;
            }
        </script>
    </head>
    <body onload="display()">
        <button onclick="pushArray()">Push</button>
        <button onclick="popArray()">Pop</button>
        <p id="demo"></p>
    </body>
</html>

Output