我对Discord.js有问题

我是discord.js的新手，我想知道如何修复这个错误。你能帮我修改一下代码，然后告诉我以后如何避免这个问题吗？谢谢

代码：

client.on('message', message => {
if (message.content === '-ping') {
    const embed = {
        "title": "**Ping Results**",
        "fields": [
          {
            "name": "Bot",
            "value": "" +(botMsg.createdAt - message.createdAt) + "ms"
          },
          {
            "name": "API ",
            "value": Math.round(client.ping) + "ms"
          },
          {
            "name": "Uptime",
            "value": msToTime(client.uptime) + "ms"
          }
        ]
      };
      message.channel.send({ embed });
}

ReferenceError: botMsg is not defined
at Client.<anonymous> (C:\Users\parke\Documents\Discord Bot\index.js:15:31)
at Client.emit (events.js:314:20)
at MessageCreateAction.handle (C:\Users\parke\Documents\Discord Bot\node_modules\discord.js\src\client\actions\MessageCreate.js:31:14)
at Object.module.exports [as MESSAGE_CREATE] (C:\Users\parke\Documents\Discord Bot\node_modules\discord.js\src\client\websocket\handlers\MESSAGE_CREATE.js:4:32)
at WebSocketManager.handlePacket (C:\Users\parke\Documents\Discord Bot\node_modules\discord.js\src\client\websocket\WebSocketManager.js:384:31)
at WebSocketShard.onPacket (C:\Users\parke\Documents\Discord Bot\node_modules\discord.js\src\client\websocket\WebSocketShard.js:444:22)
at WebSocketShard.onMessage (C:\Users\parke\Documents\Discord Bot\node_modules\discord.js\src\client\websocket\WebSocketShard.js:301:10)
at WebSocket.onMessage (C:\Users\parke\Documents\Discord Bot\node_modules\ws\lib\event-target.js:125:16)
at WebSocket.emit (events.js:314:20)
at Receiver.receiverOnMessage (C:\Users\parke\Documents\Discord Bot\node_modules\ws\lib\websocket.js:797:20)

}))

控制台错误：

client.on('message', message => {
if (message.content === '-ping') {
    const embed = {
        "title": "**Ping Results**",
        "fields": [
          {
            "name": "Bot",
            "value": "" +(botMsg.createdAt - message.createdAt) + "ms"
          },
          {
            "name": "API ",
            "value": Math.round(client.ping) + "ms"
          },
          {
            "name": "Uptime",
            "value": msToTime(client.uptime) + "ms"
          }
        ]
      };
      message.channel.send({ embed });
}

ReferenceError: botMsg is not defined
at Client.<anonymous> (C:\Users\parke\Documents\Discord Bot\index.js:15:31)
at Client.emit (events.js:314:20)
at MessageCreateAction.handle (C:\Users\parke\Documents\Discord Bot\node_modules\discord.js\src\client\actions\MessageCreate.js:31:14)
at Object.module.exports [as MESSAGE_CREATE] (C:\Users\parke\Documents\Discord Bot\node_modules\discord.js\src\client\websocket\handlers\MESSAGE_CREATE.js:4:32)
at WebSocketManager.handlePacket (C:\Users\parke\Documents\Discord Bot\node_modules\discord.js\src\client\websocket\WebSocketManager.js:384:31)
at WebSocketShard.onPacket (C:\Users\parke\Documents\Discord Bot\node_modules\discord.js\src\client\websocket\WebSocketShard.js:444:22)
at WebSocketShard.onMessage (C:\Users\parke\Documents\Discord Bot\node_modules\discord.js\src\client\websocket\WebSocketShard.js:301:10)
at WebSocket.onMessage (C:\Users\parke\Documents\Discord Bot\node_modules\ws\lib\event-target.js:125:16)
at WebSocket.emit (events.js:314:20)
at Receiver.receiverOnMessage (C:\Users\parke\Documents\Discord Bot\node_modules\ws\lib\websocket.js:797:20)

ReferenceError:未定义botMsg
在客户端。（C:\Users\parke\Documents\Discord Bot\index.js:15:31）
在Client.emit（events.js:314:20）
在MessageCreateAction.handle（C:\Users\parke\Documents\Discord Bot\node\u modules\Discord.js\src\client\actions\MessageCreate.js:31:14）
在Object.module.exports[作为消息\u CREATE]（C:\Users\parke\Documents\Discord Bot\node\u modules\Discord.js\src\client\websocket\handlers\MESSAGE\u CREATE.js:4:32）
在WebSocketManager.handlePacket（C:\Users\parke\Documents\Discord Bot\node\u modules\Discord.js\src\client\websocket\WebSocketManager.js:384:31）
在WebSocketShard.onPacket（C:\Users\parke\Documents\Discord Bot\node\u modules\Discord.js\src\client\websocket\WebSocketShard.js:444:22）
在WebSocketShard.onMessage（C:\Users\parke\Documents\Discord Bot\node\u modules\Discord.js\src\client\websocket\WebSocketShard.js:301:10）
在WebSocket.onMessage（C:\Users\parke\Documents\Discord Bot\node\u modules\ws\lib\event target.js:125:16）
在WebSocket.emit（events.js:314:20）
在Receiver.receiverOnMessage（C:\Users\parke\Documents\Discord Bot\node\u modules\ws\lib\websocket.js:797:20）

此错误表示未定义变量

botMsg

正如我所看到的，您希望发出ping命令，而botMsg是您希望收集的消息

这个代码应该可以工作

client.on（'message'，message=>{
如果（message.content=='-ping'）{
message.channel.send（“检查ping…”）。然后（botMsg=>{
常数嵌入={
“标题”：“**Ping结果**”，
“字段”：[
{
“名称”：“机器人”，
值“：”+（botMsg.createdAt-message.createdAt）+“ms”
},
{
“名称”：“API”，
“值”：Math.round（client.ping）+“ms”
},
{
“名称”：“正常运行时间”，
“值”：msToTime（客户端正常运行时间）+“ms”
}
]
};
编辑（{embed}）；
})
}
});

此错误表示未定义变量

botMsg

正如我所看到的，您希望发出ping命令，而botMsg是您希望收集的消息

这个代码应该可以工作

client.on（'message'，message=>{
如果（message.content=='-ping'）{
message.channel.send（“检查ping…”）。然后（botMsg=>{
常数嵌入={
“标题”：“**Ping结果**”，
“字段”：[
{
“名称”：“机器人”，
值“：”+（botMsg.createdAt-message.createdAt）+“ms”
},
{
“名称”：“API”，
“值”：Math.round（client.ping）+“ms”
},
{
“名称”：“正常运行时间”，
“值”：msToTime（客户端正常运行时间）+“ms”
}
]
};
编辑（{embed}）；
})
}
});