Discord.js v12 清除指令

Question

我有一个clear的命令，可以删除您想要的消息数量。 但是每当我说clear 3时，它只会清除 2 条消息。

client.on('message', async (message) => {
  if (
    message.content.toLowerCase().startsWith(prefix + 'clear') ||
    message.content.toLowerCase().startsWith(prefix + 'c ')
  ) {
    if (!message.member.hasPermission('MANAGE_MESSAGES'))
      return message.channel.send("You cant use this command since you're missing `manage_messages` perm");
    if (!isNaN(message.content.split(' ')[1])) {
      let amount = 0;
      if (message.content.split(' ')[1] === '1' || message.content.split(' ')[1] === '0') {
        amount = 1;
      } else {
        amount = message.content.split(' ')[1];
        if (amount > 100) {
          amount = 100;
        }
      }
      await message.channel.bulkDelete(amount, true).then((_message) => {
        message.channel.send(`Bot cleared \`${_message.size}\` messages :broom:`).then((sent) => {
          setTimeout(function () {
            sent.delete();
          }, 2500);
        });
      });
    } else {
      message.channel.send('enter the amount of messages that you would like to clear').then((sent) => {
        setTimeout(function () {
          sent.delete();
        }, 2500);
      });
    }
  } else {
    if (message.content.toLowerCase() === prefix + 'help clear') {
      const newEmbed = new Discord.MessageEmbed().setColor('#00B2B2').setTitle('**Clear Help**');
      newEmbed
        .setDescription('This command clears messages for example `.clear 5` or `.c 5`.')
        .setFooter(`Requested by ${message.author.tag}`, message.author.displayAvatarURL())
        .setTimestamp();
      message.channel.send(newEmbed);
    }
  }
});

Answer 1

您的代码工作正常，它删除了正确数量的消息。 您忘记的是，您当前带有评论的消息也是一条消息，并且也将计入删除的数量。 所以你可以把这个数字加一。

我可能会对您的代码进行一些更改：

1. 我不会用一个空格来分割你的消息，而是使用一个正则表达式来捕获多个空格。 当前的不适用于.clear 5 。 如果你检查， isNaN(' ')是false 。
2. 检查金额是否为正。
3. 删除硬编码的prefix es。
4. 删除不必要的await 。
5. 添加对prefix的早期检查。

client.on('message', (message) => {
  if (!message.content.startsWith(prefix) || message.author.bot) return;

  const args = message.content
    .toLowerCase()
    .slice(prefix.length)
    .trim()
    .split(/\s+/);
  const [command, input] = args;

  if (command === 'clear' || command === 'c') {
    if (!message.member.hasPermission('MANAGE_MESSAGES')) {
      return message.channel
        .send(
          "You cant use this command since you're missing `manage_messages` perm",
        );
    }

    if (isNaN(input)) {
      return message.channel
        .send('enter the amount of messages that you would like to clear')
        .then((sent) => {
          setTimeout(() => {
            sent.delete();
          }, 2500);
        });
    }

    if (Number(input) < 0) {
      return message.channel
        .send('enter a positive number')
        .then((sent) => {
          setTimeout(() => {
            sent.delete();
          }, 2500);
        });
    }

    // add an extra to delete the current message too
    const amount = Number(input) > 100
      ? 101
      : Number(input) + 1;

    message.channel.bulkDelete(amount, true)
    .then((_message) => {
      message.channel
        // do you want to include the current message here?
        // if not it should be ${_message.size - 1}
        .send(`Bot cleared \`${_message.size}\` messages :broom:`)
        .then((sent) => {
          setTimeout(() => {
            sent.delete();
          }, 2500);
        });
    });
  }

  if (command === 'help' && input === 'clear') {
    const newEmbed = new MessageEmbed()
      .setColor('#00B2B2')
      .setTitle('**Clear Help**')
      .setDescription(
        `This command clears messages for example \`${prefix}clear 5\` or \`${prefix}c 5\`.`,
      )
      .setFooter(
        `Requested by ${message.author.tag}`,
        message.author.displayAvatarURL(),
      )
      .setTimestamp();

    message.channel.send(newEmbed);
  }
});

Answer 2

那是因为它也在删除触发它的消息。 简单的修复，只需取给定的数字，然后添加一个。

await message.channel.bulkDelete(parseInt(amount) + 1, true).then((_message) => {

Answer 3

触发消息（命令消息）也被获取。

有多种解决方案：

1. 在获取/批量删除其他消息之前删除命令消息
2. 仅获取在命令消息之前发送的消息
3. 将删除消息的数量增加 1

我在以下代码中标记了所有 3 个解决方案

client.on('message', async (message) => {
  if (
    message.content.toLowerCase().startsWith(prefix + 'clear') ||
    message.content.toLowerCase().startsWith(prefix + 'c ')
  ) {
    if (!message.member.hasPermission('MANAGE_MESSAGES'))
      return message.channel.send("You cant use this command since you're missing `manage_messages` perm");
    if (!isNaN(message.content.split(' ')[1])) {
      let amount = 0;
      if (message.content.split(' ')[1] === '1' || message.content.split(' ')[1] === '0') {
        amount = 1;
      } else {
        amount = message.content.split(' ')[1];
        if (amount > 100) {
          amount = 100;
        }
      }

/* 1. Solution */

      await message.delete().catch(e => { amount++; });

      await message.channel.bulkDelete(amount, true).then((_message) => {
        message.channel.send(`Bot cleared \`${_message.size}\` messages :broom:`).then((sent) => {
          setTimeout(function () {
            sent.delete();
          }, 2500);
        });
      });

/* 2. Solution */
      const messagesToDelete = await message.channel.messages.fetch({ before: message.id, limit: amount });

      await message.channel.bulkDelete(messagesToDelete, true).then((_message) => {
        message.channel.send(`Bot cleared \`${_message.size}\` messages :broom:`).then((sent) => {
          setTimeout(function () {
            sent.delete();
          }, 2500);
        });
      });

/* 3. Solution */

      amount >= 100 ? await message.delete() /* You can only bulk delete 100 messages */ : amount++;

      await message.channel.bulkDelete(amount, true).then((_message) => {
        message.channel.send(`Bot cleared \`${_message.size}\` messages :broom:`).then((sent) => {
          setTimeout(function () {
            sent.delete();
          }, 2500);
        });
      });

/* The following code is your old code */

    } else {
      message.channel.send('enter the amount of messages that you would like to clear').then((sent) => {
        setTimeout(function () {
          sent.delete();
        }, 2500);
      });
    }
  } else {
    if (message.content.toLowerCase() === prefix + 'help clear') {
      const newEmbed = new Discord.MessageEmbed().setColor('#00B2B2').setTitle('**Clear Help**');
      newEmbed
        .setDescription('This command clears messages for example `.clear 5` or `.c 5`.')
        .setFooter(`Requested by ${message.author.tag}`, message.author.displayAvatarURL())
        .setTimestamp();
      message.channel.send(newEmbed);
    }
  }
});