将数组升序或降序

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<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>将数组升序或降序</title>
<script type="text/javascript">
var Descending = function(arr) {

var i, j, temp, len = arr.length;

for (i = 0; i < len; i++) {

for (j = i + 1; j < len; j++) {

if (arr[i] < arr[j]) {
temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
}
}
}

return arr;
}

var arr = [1,2,3,4,5,6,7,8,9];
Descending(arr);
alert(arr);
</script>
</head>

</html>