Discord.js 变量在定义时不存在？

如何解决Discord.js 变量在定义时不存在？

我正在尝试使用 discord.js 和 minecraft-server-util 编写一个 bot 命令，但我的代码没有使用我定义的 const 并且说它不存在。如果您发现任何其他问题，您可以纠正我。

client.on('message',message => {
  if (message.content === `${prefix}javaserverstatus`) {
    const args = message.content.slice(prefix.length).trim().split(' '); // this is where args is defined.
        if (!args.length) {
            return message.channel.send(`You didn't provide a server,${message.author}!`); // checks if args exist
        }
    if (args.length > 1) {
      return message.channel.send(`Wrong input! EG. play.hypixel.net,${message.author}`); // checks if there are only 1 arguments
    }

      }
    const util = require('minecraft-server-util');
    var serverinfo = null
    util.status(args) // This code is giving an error saying args does not exist.
     .then((response) => {
        console.log(response);
        serverinfo = response;
    const embed = new discord.MessageEmbed()
      .setTitle('play.hypixel.net Server Status')
      .setColor(0xff0000)
      .setDescription('IP: ' + response.host + '\n' + 'Port: ' + response.port + '\n' + 'Version: ' + response.version + '\n' + 'Online Players: ' + response.onlinePlayers.toString() + '\n' + 'Max Players: ' + response.maxPlayers.toString() + '\n');
      message.channel.send(embed);
      })
      .catch((error) => {
        console.error(error);
    });
});

解决方法

错误是由于您在其中定义了 args 的范围。 args 是在您的第一个 if 语句中定义的，而它应该在上面的一行中定义。

const args = message.content.slice(prefix.length).trim().split(' ');
if (message.content === `${prefix}javaserverstatus`) {
    // this is where args is defined.
    if (!args.length) {
        return message.channel.send(`You didn't provide a server,${message.author}!`); // checks if args exist
    }
    if (args.length > 1) {
        return message.channel.send(`Wrong input! EG. play.hypixel.net,${message.author}`); // checks if there are only 1 arguments
    }
}

,

您已经在 if 语句中定义了 args。你需要把它放在那里。

client.on('message',(message) => {
  const args = message.content.slice(prefix.length).trim().split(' ') // this is where args is defined.
  if (message.content === `${prefix}javaserverstatus`) {
    if (!args.length) {
      return message.channel.send(`You didn't provide a server,${message.author}!`) // checks if args exist
    }
    if (args.length > 1) {
      return message.channel.send(`Wrong input! EG. play.hypixel.net,${message.author}`) // checks if there are only 1 arguments
    }
  }
  const util = require('minecraft-server-util')
  var serverinfo = null
  util
    .status(args) // This code is giving an error saying args does not exist.
    .then((response) => {
      console.log(response)
      serverinfo = response
      const embed = new Discord.MessageEmbed()
        .setTitle('play.hypixel.net Server Status')
        .setColor(0xff0000)
        .setDescription('IP: ' + response.host + '\n' + 'Port: ' + response.port + '\n' + 'Version: ' + response.version + '\n' + 'Online Players: ' + response.onlinePlayers.toString() + '\n' + 'Max Players: ' + response.maxPlayers.toString() + '\n')
      message.channel.send(embed)
    })
    .catch((error) => {
      console.error(error)
    })
})

如果这不起作用，请将您在不和谐聊天中发送的命令发送给我。