javascript - 无法读取未定义的属性 'addRole'

Question

我设置了一个 addRole 命令并且该命令有效，但如果有人仅键入“!rbu”而没有成员，则机器人会出错。

也许强制一个人让代码工作，他们必须输入这个人，但我对此很陌生

  let args = message.content.substring(PREFIX.length).split(" ");

switch(args[0]){
   case'rbu':

case'rbu':

if(!message.member.roles.find(r => r.name === "👑GroupI👑")) return message.channel.send('You cant do that')

let memberToModify = message.mentions.members.first();
var roleToAdd = message.guild.roles.find(role => role.name === "💍GroupII💍");
memberToModify.addRole(roleToAdd);

break;

    }
  }
)


I expect this to do nothing or message that member must type !rbu and user

memberToModify.addRole(roleToAdd)
               ^

TypeError: Cannot read property 'addRole' of undefined```

Answer 1

首先，你有 2 个 case'rbu': 这很奇怪。然后，您需要确保消息确实提到了 message.mentions 属性，如下所示:

let args = message.content.substring(PREFIX.length).split(" ");

switch(args[0]){
   case'rbu':

    if(!message.member.roles.find(r => r.name === "👑GroupI👑") || !message.mentions) return
message.channel.send('You cant do that')

    let memberToModify = message.mentions.members.first();
    var roleToAdd = message.guild.roles.find(role => role.name === "💍GroupII💍");
    memberToModify.addRole(roleToAdd);

break;
}