Node.js + Discord.js：無法讀取未定義的屬性“類”

Question

我對變量有疑問。 我正在研究 Discord RPG 機器人，但遇到了玩家數據問題。 當我使用控制台啟動機器人並發送消息以構建我的統計信息時，控制台將返回

C:\Users\willi\OneDrive\Desktop\discord-bot\homies.js:395
                    player[id].class = reply;
                                     ^

TypeError: Cannot set property 'class' of undefined

我使用下面的代碼。 這是整個程序的一個片段。 這需要的所有文件都存在。

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

const player = fs.readFileSync('user.json', 'utf-8');

client.on('message', message => {
    var id = message.author.id;

    if (player[id] === undefined) {
            player[id] = {
                username: message.author.username,
                class: undefined,
                xp: 0,
                lvl: 1,
                xpReq: 100 + this.lvl * 75,
                hp: 0,
                maxHp: 0,
                str: 0,
                def: 0,
                int: 0,
                dex: 0,
                luck: 0,
                mana: 0,
                maxMana: 0,
                equip: {
                    top: undefined,
                    bottom: undefined,
                    hand: undefined,
                    acc1: undefined,
                    acc2: undefined
                },
                spellcaster: undefined,
                spells: []
            };
            var authorVerifier = m => m.author.id === id;
            var classAnswer = message.channel.createMessageCollector(authorVerifier, { time: 300000, max: 1 });
            var classInterpreter = function(reply) {
                if (reply !== 'fighter' && reply !== 'adventurer' && reply !== 'mage'
                && reply !== 'healer' && reply !== 'rouge' && reply !== 'tank') {
                    return message.channel.send('That was not a valid class!');
                }
                else {
                    player[id].class = reply;
                    fs.writeFileSync('user.json', player[id], (err) => {
                        if (err) throw err;
                    });
                }
            }
        classAnswer.on('collect', m => classInterpreter(m.content));
    }
});

我嘗試用message.author.id替換id ，但無濟於事。 請幫忙！

Answer 1

您可以通過將播放器數組傳遞給classInterpreter function 來解決它，並使用它來設置player[id].class值。

classAnswer.on('collect', m => classInterpreter(m.content, player));