javascript - 在Node.js中导出变量时出错

我想导出一个变量。但这发生了

第一个文件

const commando = require('discord.js-commando');
const ytdl = require('ytdl-core');


class testCommand extends commando.Command {
    constructor(client) {
        super(client,{
            name: 'test',
            group: 'music',
            memberName: 'test',
            description: 'test',
        });

    }

    async run(message, args) {

        var Testo = 'hello'

    }

}

module.exports.Testo = Testo;
module.exports = testCommand;

第二档

const commando = require('discord.js-commando');
const ytdl = require('ytdl-core');
var Testotest = require('./test.js')


class pauseCommand extends commando.Command {
    constructor(client) {
        super(client,{
            name: 'pause',
            group: 'music',
            memberName: 'pause',
            description: 'Pause music',
        });

    }


    async run(message, args) {

        message.channel.send(Testotest.Testo())

    }

}

module.exports = pauseCommand;

错误

ReferenceError: Testo is not defined
    at Object.<anonymous> (/Users/andrew/Desktop/NullBot_/commands/music/test.js:27:24)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/Users/andrew/Desktop/NullBot_/commands/music/pause.js:3:17)
    at Module._compile (module.js:652:30)

为什么会给出错误？

最佳答案

您在方法Testo中定义run
如果运行方法run Testo = 'hello'，但是定义了class testCommand，则Testo是undefined，则将运行方法run保留一次以定义Testo。

此代码

module.exports.Testo = Testo;

设置module.exports = {Testo: Testo}

但是你用

module.exports = testCommand;

设置module.exports = testCommand

呼叫时Testotest.Testo是testCommand.Testo（未定义）

在第一个文件中更改代码：

module.exports = testCommand;
module.exports.Testo = Testo;