完成阿里云存储；

extend/think/filesystem/driver/Alioss.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace think\filesystem\driver;
+
+use League\Flysystem\AdapterInterface;
+use think\filesystem\Driver;
+use Xxtime\Flysystem\Aliyun\OssAdapter;
+
+class Alioss  extends Driver
+{
+    protected function createAdapter(): AdapterInterface
+    {
+
+        $config = [
+            'accessId'       => sysconfig('upload', 'alioss_access_key_id'),
+            'accessSecret'   => sysconfig('upload', 'alioss_access_key_secret'),
+            'endpoint'         => sysconfig('upload', 'alioss_endpoint'),
+            'bucket'       => sysconfig('upload', 'alioss_bucket'),
+        ];
+
+        return new OssAdapter(
+            $config
+        );
+    }
+}