sortFilenames.js

function sortFileNames(arr) {
  for (var a, t, b, v, result = [], l = arr.length, i = l; i--; ) {
    v = arr[i];
    t = typeof v;
    result[i] = { b: b = t == 'number' || t == 'string', a: a = [], v: v };
    if (b) {
      (v + '').replace(/(\d+)|\D+/g, function(m, isDigits) {
        a.push(isDigits ? parseInt(m, 10) : m);
      });
    }
  }
  result.sort(function(a, b) {
    if (a.b && b.b) {
      a = a.a;
      b = b.a;
      for (var tA, tB, al = a.length, bl = b.length, i = 0, l = Math.min(al, bl); i < l; i++) {
        tA = a[i];
        tB = b[i];
        if (tA != tB) return tA < tB ? -1 : 1;
      }
      return al - bl;
    }
  });
  for (; l--; ) result[l] = result[l].v;
  return result;
}