'shouting'时如何删除命令的一部分?

How to remove part of a command when 'shouting'?

if (message.content.toLowerCase().startsWith(prefix + `shout`)) {
  if (!message.member.roles.some(r => ["shout perms"].includes(r.name)))
    return message.reply("Sorry, you don't have permissions to use this!");

  if (!args) {
    return;
    message.reply('Please specify a message to shout.')
  }
  const shoutMSG = args.join(" ");

  roblox.shout(groupId, shoutMSG)
    .then(function() {
      console.log(`Shouted ${shoutMSG}`);

    })
  message.channel.sendMessage(`Shouted ${shoutMSG}`)
    .catch(function(error) {
      console.log(`Shout error: ${error}`)
    });
}

上面是代码,当使用命令时,会向 Roblox 发送喊叫,但是,它也会喊出前缀和命令,如下所示。我该如何解决这个问题,让它只喊出消息而不是前缀和命令?

你只需要截掉前7个字符。 1 为前缀。 5 个用于喊叫,还有 1 个用于 space

var shoutMSG = '!shout Please mark this as correct'
console.log(shoutMSG)
shoutMSG = shoutMSG.substr(7)
console.log(shoutMSG)