Javascript/task 23.html at main · azarcoder/Javascript · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <input type="number" id="n">
    <button onclick="fun()">click me</button>
    <p id="demo"></p>
    <script>
        function fun()
        {
            var n=document.getElementById("n").value
            var a=document.getElementById("demo")
            a.innerHTML=''
            try{
            if(n>20) throw "out of range"
            if(n=="") throw "empty"
            }
            catch(error)
            {
                a.innerHTML=error
            }
            finally{
            for(var i=1;i<=n;i++)
                a.innerHTML+=i+" "
            }
        }
    </script>
</body>
</html>