（节点：10388）UnhandledPromiseRejectionWarning：TypeError：无法读取未定义的属性“缓存”

Question

我遇到了上述错误，我只是在测试是否可以在特定公会的频道中发送违规者的标签，并且代码看起来很像下面（忽略一些不一致的部分。下面是cmd文件中的代码。

const { prefix } = require("../config.json");

module.exports = {
    name: "report",
    description: "This command allows you to report a user for smurfing.",
    catefory: "misc",
    usage: "To report a player, do $report <discord name> <reason>",
    async execute(message, client) {

        const args = message.content.slice(1).trim().split(/ +/);
        const offender = message.mentions.users.first();

        if (args.length < 2 || !offender.username) {
            return message.reply('Please mention the user you want to report and specify a reason.');
        }


        const reason = args.slice(2).join(' ');

        client.channels.cache.get('xxxxx').send(offender);

        message.reply("You reported"${offender} for reason: ${reason}`);
    }
}

这个命令在没有下面一行的情况下完全可以正常工作。

client.channels.cache.get('xxxxx').send(offender);

但是一旦包含此行运行，我就会收到此错误。

(node:10388) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'cache' of undefined

下面是我的索引文件。

const fs = require('fs');
const Discord = require("discord.js");
const { prefix, token } = require('./config.json');
const client = new Discord.Client();
client.prefix = prefix;
client.commands = new Discord.Collection();


const commandFiles = fs.readdirSync('./commands').filter(file => file.endsWith('.js'));

for (const file of commandFiles) {
    const command = require(`./commands/${file}`);
    client.commands.set(command.name, command);
}
const eventFiles = fs.readdirSync('./events').filter(file => file.endsWith('.js'));

for (const file of eventFiles) {
    const event = require(`./events/${file}`);
    if (event.once) {
        client.once(event.name, (...args) => event.execute(...args,client));
    } else {
        client.on(event.name, (...args) => event.execute(...args,client));
    }
}

client.login(token);

事件：

message.js

module.exports = {
    name: "message",
    execute(message,client){
        if (!message.content.startsWith(client.prefix) || message.author.bot) return;
        const args = message.content.slice(client.prefix.length).trim().split(/ +/);
        const command = args.shift().toLowerCase();
        if (!client.commands.has(command)) return;
        try {
            client.commands.get(command).execute(message ,args, client);
        } catch (error) {
            console.error(error);
            message.reply('there was an error trying to execute that command!');
        }
    }
}

ready.js

module.exports = {
    name: "ready",
    once: true,
    execute(client){
        console.log("successfully logged in!");
        client.user.setActivity("VTB", {
            type: "STREAMING",
            url: "https://www.twitch.tv/monstercat"
      });
    }
}

Answer 1

您的问题可能来自这一行：

(...args) => event.execute(...args, client)

这基本上意味着“获取所有参数并将它们传递给event.execute”，因此您传递的参数数量不确定（取决于事件类型）并且client 不能保证是第二个，因为你期待。

为了提供更多细节，Discord 客户端可以发送多种不同类型的事件，并且每种类型的事件在回调中提供不同数量的参数。换句话说，通过这样写：(...args) => event.execute(...args,client) 您正在检索未知数量的参数，并将它们全部传递给 event.execute 函数，因此 client 参数的位置可能会有所不同，它不一定是第二个，因为您期望在函数签名中：async execute(message, client) {

如果不需要其他参数，您可以只检索第一个参数，如下所示：

client.once(event.name, arg => event.execute(arg, client));

如果您绝对需要所有参数，请先传递客户端，这样它就永远不会移动，如下所示：

client.once(event.name, (...args) => event.execute(client, ...args));

同时修改execute签名：

async execute(client, ...args) {

Answer 2

module.exports = {
    name: "eg",
    description: "not ready",
    category: "test",
    execute(message, args, client){
        const channel = client.channels.cache.get('853031094054944798');
            channel.send('test');
    }
}

这是在客户端修复它之前添加的参数。

所以在这个例子中：

const { prefix } = require("../config.json");

module.exports = {
    name: "report",
    description: "This command allows you to report a user for smurfing.",
    catefory: "misc",
    usage: "To report a player, do $report <discord name> <reason>",
    async execute(message, args, client) {

        const args = message.content.slice(1).trim().split(/ +/);
        const offender = message.mentions.users.first();

        if (args.length < 2 || !offender.username) {
            return message.reply('Please mention the user you want to report and specify a reason.');
        }


        const reason = args.slice(2).join(' ');

        client.channels.cache.get('xxxxx').send(offender);

        message.reply("You reported"${offender} for reason: ${reason}`);
    }
}

应该是这个。