code: function containsCharacter2(string, char1, char2) {
    for (var i = 0, len = string.length; i < len; ++i) {
      var ch = string.charCodeAt(i);
      if (ch === char1 || ch === char2) return true;
    }
    return false;
  }
docs: See if `char1` or `char2` (integer codes for characters) is contained in `string`