<code>
<pre>
var result = [];
function permutation1(arr) {
perm1(arr, 0);
}
function perm1(arr, index) {
var n = arr.length;
if (index === n - 1) {
result.push(arr.slice());
return false;
} else {
for (j = index; j < n; ++j) {
swap(arr, j, index);
arguments.callee(arr, j + 1);
swap(arr, j, index);
}
}
}
function swap(arr, index1, index2) {
var temp = arr[index1];
arr[index1] = arr[index2];
arr[index2] = temp;
}
</pre>
</code>