不和谐.js | TypeError：无法读取未定义的属性“0”

Question

好的，所以我正在尝试创建一个不和谐的机器人命令（广播），我想将 args[0] 作为广播频道的 ID，但是当我尝试它时，它会记录以下内容：

TypeError: Cannot read property '0' of undefined
    at Object.execute (C:\Users\Jakub Sokol\Documents\Coding\Discord Bots\WaterDrop\commands\broadcast.js:8:40)
    at Client.<anonymous> (C:\Users\Jakub Sokol\Documents\Coding\Discord Bots\WaterDrop\index.js:69:11)
    at Client.emit (events.js:315:20)
    at MessageCreateAction.handle (C:\Users\Jakub Sokol\Documents\Coding\Discord Bots\WaterDrop\node_modules\discord.js\src\client\actions\MessageCreate.js:31:14)
    at Object.module.exports [as MESSAGE_CREATE] (C:\Users\Jakub Sokol\Documents\Coding\Discord Bots\WaterDrop\node_modules\discord.js\src\client\websocket\handlers\MESSAGE_CREATE.js:4:32)
    at WebSocketManager.handlePacket (C:\Users\Jakub Sokol\Documents\Coding\Discord Bots\WaterDrop\node_modules\discord.js\src\client\websocket\WebSocketManager.js:386:31)
    at WebSocketShard.onPacket (C:\Users\Jakub Sokol\Documents\Coding\Discord Bots\WaterDrop\node_modules\discord.js\src\client\websocket\WebSocketShard.js:436:22)
    at WebSocketShard.onMessage (C:\Users\Jakub Sokol\Documents\Coding\Discord Bots\WaterDrop\node_modules\discord.js\src\client\websocket\WebSocketShard.js:293:10)
    at WebSocket.onMessage (C:\Users\Jakub Sokol\Documents\Coding\Discord Bots\WaterDrop\node_modules\ws\lib\event-target.js:125:16)        
    at WebSocket.emit (events.js:315:20)

这是我在命令中的代码：

module.exports = {
    name: 'broadcast',
    aliases: ["bc"],
    usage: "[channel id] [message]",
    description: "Broadcasts a message in a channel!",
    execute(client, message, args){

        const bcchannel = parseInt(args[0]);
        const bcchannelsend = client.channels.cache.get(bcchannel);

        if (isNaN(bcchannel)) {
            return message.reply('that doesn\'t seem to be a valid channel ID!');
        } else if(args){
            bcchannelsend.send(args.join(' '));
            }   
    }
}

Answer 1

Cannot read property '0' of undefined 表示args 未定义。

您需要在使用前定义 args 变量。

你可以这样做：const args = message.content.slice(PREFIX.length).trim().split(" ");

下次您看到此类错误时，请务必检查哪个变量受到未定义问题的影响。 ^

对于您的 index.js 文件，我应该替换：

    try {
        command.execute(message, args);
    } catch (error) {
        console.error(error);
        message.reply('there was an error trying to execute that command!');
    }

作者：

    try {
        command.execute(client, message, args);
    } catch (error) {
        console.error(error);
        message.reply('there was an error trying to execute that command!');
    }

因为你的 execute() 方法有 3 个参数，而不是两个。