为啥我在nodejs中的代码会出错并要求我写catch，但我已经在代码中说了

Posted 2023-03-14

【中文标题】为啥我在nodejs中的代码会出错并要求我写catch，但我已经在代码中说了

【英文标题】：why does my code in nodejs gives error and asks me to write catch but i have already said it in the code为什么我在nodejs中的代码会出错并要求我写catch，但我已经在代码中说了

【发布时间】：2021-04-21 05:02:40

【问题描述】：

所以这是错误

(node:24077) UnhandledPromiseRejectionWarning: TypeError: Cannot set property 'id' of undefined
at Client.msg (/app/bot.js:18:22)
at Client.emit (events.js:196:13)
at MessageCreateAction.handle (/rbd/pnpm-volume/3c4dae99-ae7d-482d-8189-d37183b015d2/node_modules/.registry.npmjs.org/discord.js/12.5.1/node_modules/discord.js/src/client/actions/MessageCreate.js:31:14)
at Object.module.exports [as MESSAGE_CREATE] (/rbd/pnpm-volume/3c4dae99-ae7d-482d-8189-d37183b015d2/node_modules/.registry.npmjs.org/discord.js/12.5.1/node_modules/discord.js/src/client/websocket/handlers/MESSAGE_CREATE.js:4:32)
at WebSocketManager.handlePacket (/rbd/pnpm-volume/3c4dae99-ae7d-482d-8189-d37183b015d2/node_modules/.registry.npmjs.org/discord.js/12.5.1/node_modules/discord.js/src/client/websocket/WebSocketManager.js:384:31)
at WebSocketShard.onPacket (/rbd/pnpm-volume/3c4dae99-ae7d-482d-8189-d37183b015d2/node_modules/.registry.npmjs.org/discord.js/12.5.1/node_modules/discord.js/src/client/websocket/WebSocketShard.js:444:22)
at WebSocketShard.onMessage (/rbd/pnpm-volume/3c4dae99-ae7d-482d-8189-d37183b015d2/node_modules/.registry.npmjs.org/discord.js/12.5.1/node_modules/discord.js/src/client/websocket/WebSocketShard.js:301:10)
at WebSocket.onMessage (/rbd/pnpm-volume/3c4dae99-ae7d-482d-8189-d37183b015d2/node_modules/.registry.npmjs.org/ws/7.4.2/node_modules/ws/lib/event-target.js:132:16)
at WebSocket.emit (events.js:196:13)
at Receiver.receiverOnMessage (/rbd/pnpm-volume/3c4dae99-ae7d-482d-8189-d37183b015d2/node_modules/.registry.npmjs.org/ws/7.4.2/node_modules/ws/lib/websocket.js:825:20)
(node:24077) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:24077) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

这是代码

console.log('loding')
const Discord = require('discord.js');
const client = new Discord.Client();
const fetch = require('node-fetch')

client.login(process.env.SECRET);


client.on('ready', () => 
  console.log(`Logged in as $client.user.tag!`);
);



client.on('message', msg) 

async function msg()

这是 Discord 频道 ID

  if (msg.channel.id = '791583092275937303' )
   if (msg.content === 'ping') 
     msg.reply('Pong!');
   else if (msg.content === '!gif')
     msg.reply('gif');
     let url = `https://api.tenor.com/v1/search?q=codingtrain&key=$process.env.tenor&limit=8`
     
     wow().then(response => 
      console.log('ok')
       msg.reply('ok')
  ).catch(err => 
      console.log(err);
      
  );

     
     async function wow()
     let response = await fetch(url)
     let blob = await response.json();
     
     
   
  

这是错误前的控制台

node bot.js
loding
Logged in as cybemachine#8971!

这是 Discord 服务器链接：- https://discord.gg/CvCBUsyN

【参考方案1】：

您在消息事件之外使用msg，因此msg 未定义。您还在第一个 if 条件中说 =，但它必须是 === 或 ==，因为您想知道 id 是否等于您提供的 id。仅使用= 意味着您要设置变量的值。您必须将代码更新为：

console.log('loding')
const Discord = require('discord.js');
const client = new Discord.Client();
const fetch = require('node-fetch')

client.login(process.env.SECRET);

client.on('ready', () => 
  console.log(`Logged in as $client.user.tag!`);
);

client.on('message', async msg => 
  if (msg.channel.id === '791583092275937303') 
    if (msg.content === 'ping') 
      msg.reply('Pong!');
     else if (msg.content === '!gif') 
      msg.reply('gif');
      let url = `https://api.tenor.com/v1/search?q=codingtrain&key=$process.env.tenor&limit=8`

      wow().then(response => 
        console.log('ok')
        msg.reply('ok')
      ).catch(err => 
        console.log(err);

      );


      async function wow() 
        let response = await fetch(url)
        let blob = await response.json();

      
    
  
)

【讨论】：

没错，但顺便说一句，if (msg.channel.id = '791583092275937303') 不应该是if (msg.channel.id === '791583092275937303')？

@DmitriyFrolov 你说得对，我错过了，对不起。编辑了我的答案。