提及检测discord bot javascript的问题

Question

I want my bot to answer something when I mention it, it works once then the bot crashes and i get an error in this code:

bot.on('message', message =>{
    if(message.mentions.members.first().id == '602929944779292682'){
        message.channel.sendMessage('**A votre service!**')
    }
})

Error message:

TypeError: Cannot read property 'id' of undefined

Answer 1

I think you should check the members element before getting its id

bot.on('message', message =>{
    if (message.mentions.members.first() !== undefined) {
        if(message.mentions.members.first().id == '602929944779292682'){
            message.channel.sendMessage('**A votre service!**')
        }
    } else {
        // Handle members.first() is undefined
    }
})

Answer 2

2 things in advance:

1. Use always === / !== and not == / != !

2. channel.sendMessage() is deprecated! Use channel.send() instead.

---

Cleaned up code and problem fixed (much like @ThanhPhan does)

bot.on("message", message => {

 if (message.mentions.members.first() !== undefined) {

  if (message.mentions.members.first().id === bot.user.id) { # This is the bots user id

   message.channel.send("**A votre service!**")

  }

 }

})