半萌半骚长发及腰

SyntaxError:意外的令牌'?在 repl.it 上用 JavaScript 制作不和谐机器人时

const token = this.client.token ?? this.client.accessToken;
                                 ^
SyntaxError: Unexpected token '?'

const Discord = require("discord.js")
const client = new Discord.Client()

client.on("ready", () => {
  console.log(`Logged in as ${client.user.tag}!`)
})

client.on("message", msg => {
  if (msg.content === "ping") {
    msg.reply("pong")
  }
})

client.login("my token here")

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