我一直在尝试检测 Discord 客户端本身是否存在用户...我使用了这个：
var user_id;
//on message and after assigning user_id
if(client.users.cache.get(user_id) !== undefined) {
//checks if user does exist on the client and does action (it always thinks it's undefined for some reason)
}
你能帮帮我吗？感谢您的所有帮助...
谢谢你， Rako 游戏
【问题讨论】：
client.fetch(user_id)？
标签： javascript node.js discord.js detect
欢迎来到 SO！这就是我的做法。 UserManager#Cache 是一个集合，因此您可以使用Collection#has 检查您要查找的内容是否存在。演示：
const userId = "000000000000000000";
const exists = client.users.cache.has(userId);
console.log(exists); // true or false
// Advice to stop making cringe code --no worries, we've all been there before ;)
if (exists) doSomething(); // And not: if (exists === true), although it still can be used in other places
if (!exists) do SomethingElse(); // And definitely not: if (exists === false)
当然，这将在缓存中进行搜索，因此如果您的机器人启动时用户从未做过任何事情，它将无法工作。使用UserManager#fetch 获取并测试用户是否存在：
const exists = await client.users.fetch(userId); // Warning: await here. To be used in async functions, or to be replaced by .then()
// Here, the user is cached
console.log(exists); // undefined or User; can be check as in the snippet above. You can still wrap 'exists' with Boolean() if you feel more comfortable having boolean values
【讨论】：