public function delBatch($files)
{
$url = $this->QINIU_RS_HOST . '/batch';
$ops = [];
foreach ($files as $file) {
$ops[] = "/delete/" . self::qiniuEncode("{$this->bucket}:{$file}");
}
$params = 'op=' . implode('&op=', $ops);
$url .= '?' . $params;
trace($url);
$accessToken = $this->accessToken($url);
$response = $this->request($url, 'POST', ['Authorization' => "QBox {$accessToken}"]);
return $response;
}