我正在嘗試使用AlphaVantage API獲取一些數據，並且我想將某隻股票支付的所有股息存儲在一個數組中。我現在只嘗試保存股息，但將來我希望將股息與特定日期關聯起來。
用於擷取資料的函數：
async function fetchTimeSeriesDailyAdjusted (ticker) { //Fetch function to get the daily close and the dividends const apiTimeSeriesDailyAdjusted = `https://www.alphavantage.co/query?function=TIME_SERIES_DAILY_ADJUSTED&symbol=${symbol}&apikey=${apiKey}`; //Lik of the API - upbolate the symdate try { const response = await fetch(apiTimeSeriesDailyAdjusted); const data = await response.json(); const historicalDividend = []; //Array of the dividends for (let date in data['Time Series (Daily)']) { //This for should make the code go through all the JSON historicalDividend = entry ['7. dividend amount']; //This should store the dividend while the for loop "goes" } console.log(historicalDividend); //Console log to see the dividend return historicalDividend; //Value that the function must return } catch (error) { console.error('Error fetching apiTimeSeriesDailyAdjusted'); //Log of the error } } 這是我創建的函數，但正如我所看到的，可能你也看到了，它不起作用。
問題在於你宣告了一個名為historicalDividend的變量，並將其初始化為空數組，然後在每次迭代中重新分配整個變數給時間序列數據，這意味著你會覆蓋每次的值。此外，entry未定義，我認為你可能想使用date。
為了解決所有這些問題，你應該使用map()方法，它接受一個數組，循環遍歷它，並使用回調函數返回值創建一個新數組。
作為另一個提示：你應該檢查回應的HTTP狀態碼，以確保你獲得了預期的回應。
下面是修復了這兩個問題的你的程式碼版本：
#async function fetchTimeSeriesDailyAdjusted(ticker) { //Fetch function to get the daily close and the dividends const apiTimeSeriesDailyAdjusted = `https://www.alphavantage.co/query?function=TIME_SERIES_DAILY_ADJUSTED&symbol=${symbol}&apikey=${apiKey}`; //Lik of the API - update the symbol try { const response = await fetch(apiTimeSeriesDailyAdjusted); // Check for HTTP response code if (!response.ok) { throw new Error( $`Fetching daily time series data failed with status code '${response.status}'` ); } const data = await response.json(); const historicalDividend = data["Time Series (Daily)"].map( (entry) => entry["7. dividend amount"] ); console.log(historicalDividend); //Console log to see the dividend return historicalDividend; //Value that the function must return } catch (error) { console.error("Error fetching apiTimeSeriesDailyAdjusted"); //Log of the error } }