问Microsoft BotFramework-WebChat收到两条欢迎消息

EN

window.WebChat.renderWebChat({
   directLine: window.WebChat.createDirectLine({ token }),
   store,
   styleOptions,
   userID: guid(),
}, document.getElementById('webchat'));

} else if (turnContext.activity.type === ActivityTypes.ConversationUpdate) {
if (DEBUG) { console.log("ConversationUpdate"); }

// Do we have any new members added to the conversation?
if (turnContext.activity.membersAdded.length !== 0) {
    // Iterate over all new members added to the conversation
    for (var idx in turnContext.activity.membersAdded) {
        console.log(turnContext.activity.membersAdded);
        // Greet anyone that was not the target (recipient) of this message
        // the 'bot' is the recipient for events from the channel,
        // turnContext.activity.membersAdded == turnContext.activity.recipient.Id indicates the
        // bot was added to the conversation.
        if (turnContext.activity.membersAdded[idx].id != turnContext.activity.recipient.id) {
            if (DEBUG) {console.log("Starting MASTER_DIALOG");}
            const user = await this.userProfile.get(turnContext, {});
            user.id = this.guid();
            await this.userProfile.set(turnContext, user);
            await this.userState.saveChanges(turnContext);
            return await dialogContext.beginDialog(MASTER_DIALOG)
        }
    }
}