群消息发送者和临时消息发送者 See: MessageSender View Source src/objects/Message.ts, line 120 Members Type: Group # group 源消息群 View Source src/objects/Message.ts, line 134 Type: string # memberName 成员名 View Source src/objects/Message.ts, line 126 Type: GroupPermission # permission 成员权限 View Source src/objects/Message.ts, line 130