https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/subscribe-message.html

当用户在手机端服务通知里消息卡片右上角“...”管理消息时，或者在小程序设置管理中的订阅消息管理页面内管理消息时，相应的行为事件会推送至开发者所配置的服务器地址。（目前只推送取消订阅的事件，即对消息设置“拒收”）

上面这个推送事件时，如果设置一个订阅消息传回的json中list字段不是集合形式，跟设置多个返回不统一，处理不方便

例如设置一个时返回json： {"ToUserName":"xxxxx","FromUserName":"xxxxx","CreateTime":1625575518,"MsgType":"event","Event":"subscribe_msg_change_event","List":{"SubscribeStatusString":"reject","TemplateId":"NQezXFstp4zZV2q7u5aSprQZEx061ODkFJGLdungfoI"}}

正常设置一个订阅消息拒绝时也应该是集合形式：

{"ToUserName":"xxxxx","FromUserName":"xxxxx","CreateTime":1625575518,"MsgType":"event","Event":"subscribe_msg_change_event","List":[ {"SubscribeStatusString":"reject","TemplateId":"NQezXFstp4zZV2q7u5aSprQZEx061ODkFJGLdungfoI"} ] }

设置多个时返回json：

{"ToUserName":"xxxxx","FromUserName":"xxxxx","CreateTime":1625575681,"MsgType":"event","Event":"subscribe_msg_change_event","List":[{"SubscribeStatusString":"reject","TemplateId":"savKN0g_My3T-Hb6t5yUJ2HfG6Wj56HRJzxGOyU2z_Y"},{"SubscribeStatusString":"reject","TemplateId":"gIg6LaccfJuD1IAKzSdodAT7U3Z4ZEHZbPcLo1Q-VUo"}]}