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discord.js - 不和谐.js | TypeError：无法读取未定义的属性“toLowerCase”

问题描述

我正在尝试创建一个不和谐的机器人命令 (/role)，当我尝试该命令时它起作用了，但是当我更新到最新的节点版本时它不起作用并且它记录了这个：

TypeError: Cannot read property 'toLowerCase' of undefined
    at Object.execute (C:\Users\Jakub Sokol\Documents\Coding\Discord Bots\WaterDrop\commands\role.js:8:34)
    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)

这是代码：

module.exports = {
    name: 'role',
    description: "Assign yourself a role!",
    usage: "[role]",
    cooldown: 5,
    execute(message, args){

        const roleName = args[0].toLowerCase();
        let takeroles = ['Legend', 'Ultra', 'Onlylegend']

        if(roleName === "legend"){
            message.member.roles.add('734832820710801550').catch(console.error);
            message.reply("gave you the Legend role!");
        } else if(roleName === "ultra"){
            message.member.roles.add('734832749063700550').catch(console.error);
            message.reply("gave you the Ultra role!");
        } else if (roleName === "onlylegend" && message.member.roles.cache.has('734832820710801550')) {
            message.member.roles.add('734836969133309962').catch(console.error);
            message.reply("gave you the Only Legend role!");
        } else if (roleName === "onlylegend" && !message.member.roles.cache.has('734832820710801550')) {
            message.reply("you don't have permission to take that role!");
        }
    }
}

标签： discord.js

解决方案

foo.bar;

无法读取 'foo' 的属性 'bar' 此处foo未定义。

在您的实例中，args[0]未定义。您应该进行一些检查以确保通过提供至少一个参数if (!args.length) return message.reply(...)

基本上，您必须只是键入!role而不是!role legend or whatever

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