Discord Bot运行报ReferenceError: client is not defined错误求助

你遇到的ReferenceError: client is not defined报错是因为代码中直接调用了client.on方法，但从未提前声明、初始化过client这个Discord Bot客户端实例，程序运行时找不到对应变量就会抛出该错误。

• 首先确保项目已安装discord.js依赖，未安装的话在项目根目录运行命令：
  npm install discord.js
• 在你现有代码的最上方，添加Discord客户端初始化代码（以下为discord.js v14版本写法，是目前主流的稳定版本）：

const { Client, GatewayIntentBits } = require('discord.js');
// 初始化客户端并开启必要的权限意图
const client = new Client({
  intents: [
    GatewayIntentBits.Guilds, // 服务器访问权限
    GatewayIntentBits.GuildMessages, // 服务器消息访问权限
    GatewayIntentBits.MessageContent, // 消息内容读取权限
    GatewayIntentBits.GuildMembers // 服务器成员访问权限
  ]
});
// 替换为你自己在Discord开发者平台获取的Bot令牌
const BOT_TOKEN = "你的Bot令牌";

• 调整事件监听名称：discord.js v14已废弃旧的message事件，需将你代码里的client.on("message", (msg) => {修改为client.on("messageCreate", (msg) => {，否则无法正常监听到消息
• 在你现有全部代码的最末尾，添加Bot登录代码：

client.login(BOT_TOKEN);

• 额外适配注意项：
  • 前往Discord开发者平台的Bot设置页，打开Message Content Intent开关，否则Bot无法读取消息内容，所有消息触发命令都会失效
  • 将!clearRatelimits命令逻辑中的your id替换为你自己的Discord用户ID，否则你无法调用该清空限速的命令
  • 若使用discord.js v13及更早版本，初始化和事件写法略有差异，可自行对应调整

const { Client, GatewayIntentBits } = require('discord.js');
const client = new Client({
  intents: [
    GatewayIntentBits.Guilds,
    GatewayIntentBits.GuildMessages,
    GatewayIntentBits.MessageContent,
    GatewayIntentBits.GuildMembers
  ]
});
const BOT_TOKEN = "你的Bot令牌";

let ratelimits = [];

client.on("messageCreate", (msg) => {
    // APPLYING RATELIMITS
    const appliedRatelimit = ratelimits.find(
        (value) => 
            value.user === msg.author.id && value.channel === msg.channel.id
    );
    if (appliedRatelimit) {
        // Can they post the message?
        const canPostMessage =
            msg.createdAt.getTime() - appliedRatelimit.ratelimit >=
            appliedRatelimit.lastMessage;

        // They can
        if (canPostMessage)
            return (ratelimits[
                ratelimits.indexOf(appliedRatelimit)
            ].lastMessage = msg.createdAt.getTime());

        // They can't
        msg.delete({ reason: "Enforcing ratelimit." });
    }

    // SET RATELIMIT
    if (msg.content === "!ratelimit") {
        // Checking it's you
        if (msg.author.id !== "705923685877415979") return msg.reply("ok.");

        // You can change these values in function of the received message
        const targetedUserId = "529395455109627925";
        const targetedChannelId = msg.channel.id;
        const msRateLimit = 25000; // 25 seconds

        // Delete existant ratelimit if any for this user on this channel
        ratelimits = ratelimits.filter(
            (value) =>
                !(
                    value.user === targetedUserId &&
                    value.channel === targetedChannelId
                )
        );

        // Add ratelimit
        ratelimits.push({
            user: targetedUserId,
            channel: targetedChannelId,
            ratelimit: msRateLimit,
            lastMessage: 0,
        });
    }

    // CLEAR RATELIMITS
    if (msg.content === "!clearRatelimits") {
        // Checking it's you
        if (msg.author.id !== "替换为你自己的用户ID") return msg.reply("You can't do that.");
        // Clearing all ratelimits
        ratelimits = [];
    }
});

client.login(BOT_TOKEN);

内容的提问来源于stack exchange，提问作者Fluxility