如何每天在特定时间发送消息？

Question

我正在尝试让机器人在特定时间编写消息。示例：

const Discord = require("discord.js");
const client = new Discord.Client();
client.on("ready", () => {
  console.log("Online!");
});
var now = new Date();
var hour = now.getUTCHours();
var minute = now.getUTCMinutes();
client.on("message", (message) => {
  if (hour === 10 && minute === 30) {
    client.channels.get("ChannelID").send("Hello World!");
  }
});

不幸的是，它只有在我触发另一个命令时才有效，例如：

if (message.content.startsWith("!ping")) {
  message.channel.send("pong!");
}

my message: !ping (at 10:10 o'clock)
-> pong!
-> Hello World!

我猜它需要不断检查时间变量的东西。

Answer 1

正如 Federico 所说，这是解决这个问题的正确方法，但语法已经改变，现在随着 discord.js (v12) 的新更新，它会是这样的：

    // Getting Discord.js and Cron
    const Discord = require('discord.js');
    const cron = require('cron');
            
    // Creating a discord client
    const client = new Discord.Client();
        
    // We need to run it just one time and when the client is ready
    // Because then it will get undefined if the client isn't ready
    client.once("ready", () => {
      console.log(`Online as ${client.user.tag}`);
        
      let scheduledMessage = new cron.CronJob('00 30 10 * * *', () => {
      // This runs every day at 10:30:00, you can do anything you want
      // Specifing your guild (server) and your channel
         const guild = client.guilds.cache.get('id');
         const channel = guild.channels.cache.get('id');
         channel.send('You message');
        });
            
        // When you want to start it, use:
        scheduledMessage.start()
    };

// You could also make a command to pause and resume the job

但仍然感谢 Federico，他救了我的命！

Answer 2

我会使用cron：使用此包，您可以设置要在日期与给定模式匹配时执行的函数。
在构建模式时，您可以使用* 表示可以使用该参数的任何值执行它，并使用范围以仅表示特定值：1-3, 7 表示您接受1, 2, 3, 7。

这些是可能的范围：

• 秒：0-59
• 分钟：0-59
• 小时：0-23
• 日期：1-31
• 月份：0-11（1 月至 12 月）
• 星期几：0-6（周日至周六）

这是一个例子：

var cron = require("cron");

function test() {
  console.log("Action executed.");
}

let job1 = new cron.CronJob('01 05 01,13 * * *', test); // fires every day, at 01:05:01 and 13:05:01
let job2 = new cron.CronJob('00 00 08-16 * * 1-5', test); // fires from Monday to Friday, every hour from 8 am to 16

// To make a job start, use job.start()
job1.start();
// If you want to pause your job, use job.stop()
job1.stop();

在你的情况下，我会这样做：

const cron = require('cron');

client.on('message', ...); // You don't need to add anything to the message event listener

let scheduledMessage = new cron.CronJob('00 30 10 * * *', () => {
  // This runs every day at 10:30:00, you can do anything you want
  let channel = yourGuild.channels.get('id');
  channel.send('You message');
});

// When you want to start it, use:
scheduledMessage.start()
// You could also make a command to pause and resume the job