JavaScript Program to print Fibonacci series
Program
<!DOCTYPE html>
<html>
<head>
<title>Fibonacci Series</title>
</head>
<script>
function generateFib() {
var range = document.getElementById("range").value;
document.getElementById("fibHead").innerHTML = 'Fibonacci Series';
if (range <= 0) {
document.getElementById("fibSeries").innerHTML = 'Cannot print Fibonacci series';
}
var term_one = 0;
var term_two = 1;
var fib;
if (range == 1)
document.getElementById("fibSeries").innerHTML = term_one;
else if (range >= 2) {
document.getElementById("fibSeries").innerHTML = term_one + '<br>' + term_two;
for (var i = 0; i < range - 2; i++) {
fib = term_one + term_two;
document.getElementById("fibSeries").innerHTML += '<br>' + fib;
term_one = term_two;
term_two = fib;
}
}
}
</script>
<body>
<input type="number" id="range" name="range">
<button type="submit" onclick="generateFib()">Generate</button>
<p id="fibHead"></p>
<p id="fibSeries"></p>
</body>
</html>
Output
<p class="output">Fibonacci Series</p>
<input type="number" id="range" name="range">
<button type="submit" onclick="generateFib()">Generate</button>
<p id="fibHead"></p>
<p id="fibSeries"></p>
<script>
function generateFib() {
var range = document.getElementById("range").value;
document.getElementById("fibHead").innerHTML = 'Fibonacci Series';
if (range <= 0) {
document.getElementById("fibSeries").innerHTML = 'Cannot print fibonacci series';
}
var term_one = 0;
var term_two = 1;
var fib;
if (range == 1)
document.getElementById("fibSeries").innerHTML = term_one;
else if (range >= 2) {
document.getElementById("fibSeries").innerHTML = term_one + '<br>' + term_two;
for (var i = 0; i < range - 2; i++) {
fib = term_one + term_two;
document.getElementById("fibSeries").innerHTML += '<br>' + fib;
term_one = term_two;
term_two = fib;
}
}
}
</script>