Untitled

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>

    Hvor mange ganger skal løkken kjøre: <input id="input" type="text">
    <input id="btn" type="button" value="Kjør">

    <p id="output"></p>

    <script>

        var input = document.getElementById('input')

        var btn = document.getElementById('btn')

        var output = document.getElementById('output')

        btn.addEventListener('click', function () {
            var input1 = parseInt(input.value)

            for (var i = 0; i < input1; i++) {
                output.innerHTML = i + 1
            }
        })


    </script>

</body>

</html>