.content 不是方法，它是属性，您现在还必须启用 Message Content意图在您的机器人页面以及您的代码中.

.content is not a method, it's a property, you must now also enable the Message Content intent on your bot page as well as in your code.

const Discord = require("discord.js");
const client = new Discord.Client({ intents: ["GUILD_MESSAGES", "DIRECT_MESSAGES"] }); 

client.on("messageCreate", message => {
    // || "String" like you did before would return "true" in every single instance, 
    // this is case sensitive, if you wanna make it case insensitive 
    // use `message.content.toLowerCase() == "lowercasestring"`
    if (message.content == "AK" || message.content = "AA" || message.content == "KK") {     
        message.channel.send("Recommend Play is to shove all in" + message.author);
    }
})

client.login(token);