<!DOCTYPE html>
<html>
<body>
<p>Click the button to join three arrays.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var hege = ["Cecilie", "Lone"];
var stale = ["Emil", "Tobias", "Linus"];
var kai = ["Robin"];
var children = hege.concat(stale,kai);
document.getElementById("demo").innerHTML = children;
}
</script>
</body>
</html>