random number JavaScript HTML

<!DOCTYPE html>
<html>
<body>
​
<h2>JavaScript Math.random()</h2>
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<p>Every time you click the button, getRndInteger(min, max) returns a random number between 0
and 9 (both included):</p>
​
<button onclick="document.getElementById('demo').innerHTML = getRndInteger(0,10)">Click Me</button>
​
<p id="demo"></p>
​
<script>
function getRndInteger(min, max) {
  return Math.floor(Math.random() * (max - min)) + min;
}
</script>
​
</body>
</html>

by 8u