初始化项目：添加后端代码、ThinkPHP框架、前端资源

addons/alioss/library/OSS/Result/AppendResult.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace OSS\Result;
+
+use OSS\Core\OssException;
+
+/**
+ * Class AppendResult
+ * @package OSS\Result
+ */
+class AppendResult extends Result
+{
+    /**
+     * 结果中part的next-append-position
+     *
+     * @return int
+     * @throws OssException
+     */
+    protected function parseDataFromResponse()
+    {
+        $header = $this->rawResponse->header;
+        if (isset($header["x-oss-next-append-position"])) {
+            return intval($header["x-oss-next-append-position"]);
+        }
+        throw new OssException("cannot get next-append-position");
+    }
+}