問題描述
當我嘗試與數據交互時，會引發錯誤.
const user = client.users.cache.get(user.id);用戶.發送(消息)；<塊引用>
TypeError: 無法讀取未定義的屬性發送"
緩存工具說明
緩存是一個Collection，是Collection的擴展Map 但帶有 array 方法等等.主要供managers使用，用來防止無用API 調用，當數據被獲取時，它也將被緩存，您將能夠在不發送 API 請求的情況下檢索它多少次.因此，當數據沒有被緩存時，這意味著數據還沒有被提取，你需要這樣做.
請求是對 Discord API 的調用，由 Discord.js 模塊，等待 Discord 服務器的響應，Promise 需要 awaited 帶有 await 關鍵字或 <Promise>.then 方法.
獲取示例
您可以獲取數據并將響應分配到變量中，當您想再次訪問它時，您將能夠在緩存中檢索數據.
/* 未獲取數據，因此尚未緩存 */console.log(client.users.cache.get(user.id));//不明確的/* 從 Discord 請求數據 */const fetchedData = 等待 client.users.fetch(user.id);console.log(fetchedData);//用戶 {}/* 數據已被獲取，因此您可以從緩存中檢索數據 */console.log(client.users.cache.get(user.id));//用戶 {}經過這些解釋，出現此錯誤是正常的，因為無法將方法應用于undefined.
TypeError: 無法讀取未定義的屬性 ''
When I try to interact with data an error is thrown.
const user = client.users.cache.get(user.id);
user.send(message);
TypeError: Cannot read property 'send' of undefined
Explanation of cache utility
Cache is a Collection, an extend of Map but with array methods and more. It's mainly used by managers and used to prevents useless API calls, when data is fetched it will be cached too and you will be able to retrieve it how many time you want without sending API request. So when data is not cached it means that the data was not fetched yet and you'll need to.
A request is a call to the Discord API which is done by the Discord.js module, to wait the response of the Discord server, the Promise need to be awaited with await keyword or <Promise>.then method.
Fetch example
You can fetch data and assign the response in a variable, when you want to access it another time you will be able to retrieve data in the cache.
/* Data wasn't fetched so not cached yet */
console.log(client.users.cache.get(user.id)); // undefined
/* Request data from Discord */
const fetchedData = await client.users.fetch(user.id);
console.log(fetchedData); // User {}
/* Data has been fetched so you can retrieve data from cache */
console.log(client.users.cache.get(user.id)); // User {}
After these explanations, it's normal that this error appears since it's not possible to apply a method on something undefined.
TypeError: Cannot read property '' of undefined
這篇關于如何獲取未緩存的數據?的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！