“节点。”错误。请帮助我，让我发疯

你好，所以我收到一个奇怪的错误，说这“ const Discord = require（discord.js）^ReferenceError：未定义不和谐”这是我编写的代码，我是否在那里输入错误？

    const Discord = require(discord.js)
const Client = new Discord.Client
const prefix = "/";
Client.on('ready', ()=>{
        console.log('Bot is online.');
})
Client.on('message', (Message)=>{
    if(!Message.content.startsWith(prefix)) return;
    if(Message.content.startsWith(prefix + "hello")){
        Message.channel.send("Hello.")
    }
})
Client.login("<Token Here>");

const Discord = require('discord.js')

“节点。”错误。请帮助我，让我发疯

你好，所以我收到一个奇怪的错误，说这“ const Discord = require（discord.js）^ReferenceError：未定义不和谐”这是我编写的代码，我是否在那里输入错误？

    const Discord = require(discord.js)
const Client = new Discord.Client
const prefix = "/";
Client.on('ready', ()=>{
        console.log('Bot is online.');
})
Client.on('message', (Message)=>{
    if(!Message.content.startsWith(prefix)) return;
    if(Message.content.startsWith(prefix + "hello")){
        Message.channel.send("Hello.")
    }
})
Client.login("<Token Here>");

const Discord = require('discord.js')