Javascript script to calculate factorial of n.
// ? 2017 TheFlyingKeyboard and released under MIT License
// theflyingkeyboard.net
<html>
<body>
Enter a number: <input type="text" id="data">
<button onclick="calculate()">Convert</button>
<p>Factorial is equal to</p>
<p id="newText"></p>
<script>
function calculate(){
var data = document.getElementById("data").value;
var n = parseInt(data);
document.getElementById("newText").innerHTML = factorial(n);
}
function factorial(n)
{
var fact = 1;
for (var i = 2; i <= n; i++)
{
fact *= i;
}
return fact;
}
</script>
</body>
</html>
Javascript Factorial