write a program in javasccript to design calcualtor.html

<html>

<head>
    <title>
        write a program in javasccript to design calcualtor
    </title>
</head>

<body>
    <script>
        const operator = prompt('Enter operator to perform the calculation ( either +, -, * or / ): ');

        const number1 = parseFloat(prompt('Enter the first number: '));
        const number2 = parseFloat(prompt('Enter the second number: '));

        let result;

        if (operator == '+') {
            result = number1 + number2;
        }
        else if (operator == '-') {
            result = number1 - number2;
        }
        else if (operator == '*') {
            result = number1 * number2;
        }
        else {
            result = number1 / number2;
        }

        window.alert(" Result is" + result);  
    </script>

    <body>

</html>