Discord机器人JS代码报错‘Declaration or statement expected’求排查修复

Hey there! That syntax error is caused by a missing closing curly brace in your message event handler. Let's break down the issue and fix it step by step.

The Root Cause #

In your message event callback, the if (message.content == "hello") block doesn't have a closing }. This throws off the JavaScript parser, which expects a proper declaration or statement after the incomplete block—hence the "Declaration or statement expected" error.

Fixed Code #

const Discord = require("discord.js");
const TOKEN = "BEEP";
const PREFIX = "$$";
var bot = new Discord.Client();

bot.on("ready", function() {
    console.log("ThunderBird is a go");
    bot.user.setPresence({ game: { name: "Choccy Milk", type: 0 } });
});

bot.on("message", function(message) {
    // Ignore messages from the bot itself
    if (message.author.equals(bot.user)) return;

    // Respond to "hello"
    if (message.content == "hello") { 
        message.channel.send("Hi, how are you!");
    } // <-- This closing brace was missing

    // Ignore messages that don't start with the prefix
    if (!message.content.startsWith(PREFIX)) return;

    var args = message.content.substring(PREFIX.length).split(" ");
    switch (args[0]) {
        case "ping": 
            message.channel.send("Pong!"); 
            break;
    }
});

bot.login(TOKEN);

Key Fixes Explained #

• Added the missing } to close the if (message.content == "hello") block, restoring proper code structure.
• Cleaned up indentation to make the code's logical flow easier to read (this helps catch missing braces in the future!).

Quick Bonus Tip #

For better practice, consider using strict equality (===) instead of loose equality (==) when comparing strings, like:

if (message.content === "hello") { ... }

This avoids unexpected type coercion issues down the line.

内容的提问来源于stack exchange，提问作者Bigorse