如何將字串從函式中的catchlblock回傳到另一個檔案

連接資料庫.js

這是我要從中回傳字串的檔案...

const mongoose = require('mongoose')
require('dotenv').config()
const DB = process.env.DB

function connectDB(client) {
  if (!DB) return
  mongoose.connect(DB, {
    useNewUrlParser: true,
    useUnifiedTopology: true
  }).then(() => {
    console.log(`${client.user.username} is now connected to database. . .`)
  }).catch((err) => {
    console.log(err)
  })
}

function disconnectDB(client) {
  if (!DB) return
  mongoose.disconnect(DB, {
    useNewUrlParser: true,
    useUnifiedTopology: true
  }).then(() => {
    console.log(`${client.user.username} is now Disconnected to database. . .`)
  }).catch((err) => {
    console.log(err)
  })
}

module.exports = {
  connectDB,
  disconnectDB
}

我想從那時回傳一個字串并在 connectDB() 函式以及 disconnectDB() 中捕獲

就像是：

function connectDB(client) {
  if (!DB) return
  mongoose.connect(DB, {
    useNewUrlParser: true,
    useUnifiedTopology: true
  }).then(() => {
    console.log(`${client.user.username} is now connected to database. . .`)
    return '?? Connected' //If succesfully connects
  }).catch((err) => {
    console.log(err)
    return err.toString() //If some error occures
  })
}

function disconnectDB(client) {
  if (!DB) return
  mongoose.disconnect(DB, {
    useNewUrlParser: true,
    useUnifiedTopology: true
  }).then(() => {
    console.log(`${client.user.username} is now Disconnected to database. . .`)
    return '?? Disconnected' //If succesfully disconnects
  }).catch((err) => {
    console.log(err)
    return err.toString() //If some error occures
  })
}

然后我想在另一個檔案中訪問這些回傳的字串：

切換.js

const {
  connectDB,
  disconnectDB
} = require('../../utils/connectDB')

async execute(interaction, client) {
    const connect = interaction.options.get('connect').value
    var embRes = ''
    var clr = ''

    if (connect) {
      embRes = connectDB(client)
      if (embRes == '?? Connected') {
        clr = 'Aqua'
      } else {
        clr = 'Grey'
      }
    } else if (!connect) {
      embRes = disconnectDB(client)
      if (embRes == '?? Disconnected') {
        clr = 'Red'
      } else {
        clr = 'NotQuiteBlack'
      }
    }

請注意：我處于開發的早期階段意味著我知道的不多，所以請盡可能解釋答案！

感謝您的幫助！

uj5u.com熱心網友回復：

我認為您可以用承諾包裝一層

uj5u.com熱心網友回復：

我不知道你是如何toggle.js構造的，但你可以使用switch功能。

在你的toggle.js：

//if your command starts with ${prefix}admin
//Imagine that your command is *admin
//Then call it inside of your module.exports
const connectDB = require('../../utils/connectDB'); // I'm assuming that this is the extension folder. 
module.exports = {
  name: "admin",
  async execute(client, message, args, prefix) {
  //Take note that this is how I call my commands.
      if(args[0] == "connect") {
         switch(this.name) {
            case this.name: connectDB.connectDB(client, message, args, prefix); break;
            default: message.channel.send("SOMETHING WENT WRONG");
         }
      } else if(args[0] == "disconnect")  {
         switch(this.name) {
            case this.name: connectDB.disconnectDB(client, message, args, prefix); break;
            default: message.channel.send("SOMETHING WENT WRONG");
         }
      }
   }
}

然后在您connectDB.js呼叫與案例相同的功能

function connectDB(client, message, args, prefix) {
  //your codes here
}

function disconnectDB(client, message, args, prefix) {
  //your codes here
}

進行深入的解釋。如果您注意到有2 個 connectDB。

第一個connectDB是您的檔案。那么第二個connectDB是你的function

PS：因為您正在使用互動。只需洗掉message, args, prefix并替換為interaction

我不知道這是否適用于互動。

uj5u.com熱心網友回復：

嘗試這個

  function connectDB(client) {
    if (!DB) return
    return new Promise((resolve,_) => {
        mongoose.connect(DB, {
            useNewUrlParser: true,
            useUnifiedTopology: true
          }).then(() => {
            console.log(`${client.user.username} is now connected to database. . .`)
            resolve('?? Connected' ) //If succesfully connects
          }).catch((err) => {
            console.log(err)
            resolve(err.toString()) //If some error occures
          })
    }) 
  }

  async execute(interaction, client) {
    const embRes = await connectDB(client)
  }

標籤：javascript 猫鼬 不和谐 不和谐.js 机器人

上一篇：如何在javascript模塊模式中使用它？

下一篇：使用輸入型別“提交”向多個人發送電子郵件，其電子郵件地址在HTML表中