当用户返回到teams MS botframework时发送消息

bot.onMembersAdded(async (context, next) => {
  const membersAdded = context.activity.membersAdded;
  for (let member of membersAdded) {
    if (member.id !== context.activity.recipient.id) {
      // Check if the member is returning to Teams
      if (context.activity.channelId === 'msteams') {
        // Get the user's conversation ID or user ID
        const conversationId = context.activity.conversation.id;
        
        // Create a message to send to the user
        const message = {
          type: 'message',
          text: 'Welcome back to Teams! How can I assist you?',
          conversation: { id: conversationId }
        };
        
        // Send the message to the user
        await context.sendActivity(message);
      }
    }
  }
  await next();
});