Simple Javascript script to calculate n-th element of Fibbonaci sequence.

// © 2017 TheFlyingKeyboard and released under MIT License
// theflyingkeyboard.net

<html>
<body>
    Enter a number:  <input type="text" id="data">
    <button onclick="count()">Convert</button>
    <p>N-th Fibonacci number is equal to</p>
    <p id="newText"></p>

    <script>
        function count(){
            var data = document.getElementById("data").value;
            var n = parseInt(data);

            n = fibonacci(n);

            document.getElementById("newText").innerHTML = n;
        }

        function fibonacci(n){
            var fib = 0;
            var fibPrev1 = 1;
            var fibPrev2 = 0;
            
            for(var i = 2; i <= n; i++){
                fib = fibPrev1 + fibPrev2;
                fibPrev2 = fibPrev1;
                fibPrev1 = fib;
            }
            
            return fib;
        }
    </script>
</body>
</html>

 

Javascript Fibonacci
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