Discord.js未发送嵌入消息

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

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

client.on('message', msg => {
  if (msg.content === '!embed') {
    const embed = new Discord.MessageEmbed()
      .setTitle('嵌入消息示例')
      .setDescription('这是一个演示嵌入消息的示例。')
      .setColor('#0099ff')
      .setURL('https://www.example.com')
      .setImage('https://www.example.com/image.png')
      .setTimestamp()
      .setFooter('Powered by Discord.js', 'https://www.example.com/logo.png');

    msg.channel.send(embed);
  }
});

client.login('your-token-goes-here');