跟踪用户状态(discord.js)后发送服务器消息

const Discord = require('discord.js');
const client = new Discord.Client();

client.on('ready', () => {
  console.log(`Logged in as ${client.user.tag}`);
});

client.on('presenceUpdate', (oldPresence, newPresence) => {
  const user = newPresence.member.user;
  const guild = newPresence.guild;

  // 检查用户状态是否从离开变为在线
  if (oldPresence.status === 'offline' && newPresence.status === 'online') {
    // 发送服务器消息
    const channel = guild.channels.cache.find(channel => channel.name === 'general');
    channel.send(`${user.username} 已上线！`);
  }
});

client.login('YOUR_DISCORD_BOT_TOKEN');