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Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Fibonacci Series</title>
</head>
<body>
<script type="text/javascript">
var fib=0,fib2=1,fib1=0;
var num=prompt("Enter a Number: \n","")
if(num!=null&num>0)
{
document.write("<h1>The First "+num+" numbers in the Fibonacci Series</h1>");
if(num==1)
document.write("<h1>"+fib1+"</h1>");
else
{
document.write("<h2>"+fib1+"</h2>");
document.write("<h2>"+fib2+"</h2>");
}
for(i=3;i<=num;i++)
{
fib=fib1+fib2;
document.write("<h2>"+fib+"</h2>");
fib1=fib2;
fib2=fib;
}
}
else
alert("Inavlid Input");
</script>
</body>
</html>
Output:
