超级权限怎么设置···删除+Master Key可以允许,修改信息报错206

        var User = AV.Object.createWithoutData('User', that.objectId); //id搜寻信息
        User.set('username', that.formData.username) //设置信息
        User.set('password', that.formData.password) //设置信息
        User.save({useMasterKey: true}).then(user => { 
          //保存信息,删除方法destroy({useMasterKey: true})可以运行,保存就不行了
          //报错 206 
          var Userss = AV.Object.createWithoutData('User', that.objectId);
          var Son = AV.Object.createWithoutData('Son', that.pid);
          Son.set('profession', that.fruitlist[0].children)
          Son.set('dependent', Userss)
          Userss.set('dependent', Son)
          Userss.save({useMasterKey: true}).then(function (res) {
            that.$Message.info('修改成功');
            flag = true;
            resolve();
          }, function (error) {
            that.$Message.info('修改失败');
            flag = false;
            resolve();
          }, function (error) {
          })
        })

文档中其他两种不知其书写位置与格式···求教