Untitled

<html>
<head>
<script>
function getRndInteger(min,max) {
var min = prompt("Your number:", "min");
var max = prompt("Your number:", "max");
return Math.floor(Math.random() * (max - min + 1) + min) ;
}
</script>
</head>
<body>

<button onclick="document.getElementById('demo').innerHTML = getRndInteger(min,max)">testo</button>

<p id="demo"></p>


</body>
</html>