反复从javascript数组中获取随机项?

get random item from javascript array repeatedly?(反复从javascript数组中获取随机项?)

问题描述

我正在制作一个 Discord.js 机器人，该机器人的功能之一是在用户键入！fact"时从 Javascript 事实数组中返回一个随机项.这个问题已经被其他用户问了很多，我使用了给他们的答案中的代码，但我遇到了一个问题:机器人卡在"一个事实上，并且不会每次都随机遍历列表输入！fact".这是我到目前为止的代码示例:

I'm making a Discord.js bot and one of the functions of the bot is to return a random item from a Javascript array of facts when a user types "!fact". This question has been asked a lot by other users and I've used code from answers given to them but I've run into one problem: the bot gets "stuck" on one fact and doesn't go through the list randomly every time "!fact" is typed. This is an example of the code I have so far:

var facts = [ "Fact 1", "Fact 2", "Fact 3", "Fact 4" ]
var fact = Math.floor(Math.random() * facts.length);

然后，让机器人发送消息:

And then, for the bot to send the message:

client.on('message', message => {
    if (message.content === "!fact") {
        message.channel.send(facts[fact]);
        console.log('Message sent');
    }
});

但这只会一遍又一遍地返回类似 Fact 1 的内容，无论！fact"被输入多少次.我怎样才能让它每次都改变?

But this would only return something like Fact 1 over and over, no matter how many times "!fact" is typed. How can I make it change every time?

推荐答案

您在启动时使用此行仅确定一次随机事实:

You're determining your random fact just once at startup using this line:

var fact = Math.floor(Math.random() * facts.length);

要在每次 if 条件评估为真时获得一个随机事实，您需要为其中的事实重新分配一个新的随机整数:

To get a random fact each time the if-condition evaluates to true you need to re-assign a new random integer to facts in there:

    client.on('message', message => {
        if (message.content === "!fact") {
            fact = Math.floor(Math.random() * facts.length);
            message.channel.send(facts[fact]);
            console.log('Message sent');
        }

});

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