更改阿里token返回格式

app/Model/AliOssModel.php

@@ -23,7 +23,7 @@ class AliOssModel
             $res = http_request_code($url,$header,"POST",json_encode($data),2);
             LogModel::addlog([" 获取阿里OSS临时token 1"=>$res,"请求URL"=>$url,"请求头header"=>$header]);
 
-            $result = json_decode($res);
+            $result = json_decode($res,true);
             if ($result["code"] != 0){
                 throw new \Exception("获取token失败");
             }