How to make a array as a stack using JavaScript?

The pop() and push() functions turn a harmless array into a stack

<script type="text/javascript">

var numbers = ["one", "two", "three", "four"];

numbers.push("five");

numbers.push("six");

document.write(numbers.pop());

document.write(numbers.pop());

document.write(numbers.pop());

</script>

This produces

sixfivefour