Edit in JSFiddle

<p id="originalArray"></p>
<p id="sortAscending"></p>
<p id="sortDescending"></p>

var myArray = [6, 4, 9, 1, 0];

$("#originalArray").html("<b>Original Array: </b>" + myArray);
$("#sortAscending").html("<b>Sort Ascending: </b>" + myArray.sort());
$("#sortDescending").html("<b>Sort Descending: </b>" + myArray.sort(descending));

function descending(a, b) {
    return b - a;
}