let mergeMsg = {
  title: '小 J 和 阿罗 的聊天记录',
  previewList: [{ content: '[文件]', senderName: '阿罗' }],
  messageIdList: ['ns7c4mzpsa4g7sb5', 'ns6wbh472ayg7sb5']
}

let message = {
  conversationType: ConversationType.PRIVATE,
  conversationId: 'userId1',
  name: MessageType.MERGE,
  content: mergeMsg
};