public static function getInstance()
 {
     if (!isset(self::$instance)) {
         $c = __CLASS__;
         self::$instance = new $c();
     }
     return self::$instance;
 }
        /* 列出图片 */
    /* 列出图片 */
    case 'listimage':
    default:
        $allowFiles = $CONFIG['imageManagerAllowFiles'];
        $listSize = $CONFIG['imageManagerListSize'];
        $path = $CONFIG['imageManagerListPath'];
}
$allowFiles = substr(str_replace(".", "|", join("", $allowFiles)), 1);
//var_dump($allowFiles);
/* 获取参数 */
$size = isset($_GET['size']) ? htmlspecialchars($_GET['size']) : $listSize;
$start = isset($_GET['start']) ? htmlspecialchars($_GET['start']) : 0;
$end = $start + $size;
//演示方法
$Qiniu_List = Qiniu_List::getInstance();
$Qiniu_List->getUrl('', '', 1000);
$files = $Qiniu_List->listFiles();
$marker = $files['marker'];
if (!count($files['items'])) {
    return json_encode(array("state" => "no match file", "list" => array(), "start" => $start, "total" => count($files)));
}
/* 获取指定范围的列表 */
$len = count($files['items']);
for ($i = min($end, $len) - 1, $list = array(); $i < $len && $i >= 0 && $i >= $start; $i--) {
    if (preg_match("/\\.({$allowFiles})\$/i", $files['items'][$i]['key'])) {
        $list[] = array("url" => $HOST . "/" . $files['items'][$i]['key']);
    }
}
/* 返回数据 */
$result = json_encode(array("state" => "SUCCESS", "list" => $list, "start" => $start, "total" => count($files['items'])));