我嘗試使用此解決方案通過異步等待從多個 api 獲取資料，但輸出未定義，可能出了什么問題？
const getData = async (jwt) => {
try {
const [response1, response2, response3] = await Promise.all(
[
fetch("http://localhost:3000/api/confirmed"),
fetch("http://localhost:3000/api/deaths"),
fetch("http://localhost:3000/api/recovered"),
],
{
method: "GET",
headers: {
"user-agent": "vscode-restclient",
"content-type": "application/json",
accept: "application/json",
authorization:
"Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6MSwibmFtZSI6IkxlYW5uZSBHcmFoYW0iLCJ1c2VybmFtZSI6IkJyZXQiLCJpYXQiOjE1OTY1MDY4OTN9.KDSlP9ALDLvyy0Jfz52x8NePUejWOV_mZS6cq4-JZXs",
},
}
);
const { data1 } = await response1.json();
const { data2 } = await response2.json();
const { data3 } = await response3.json();
console.log(data1, data2, data3);
} catch (err) {
console.error(`Error: ${err}`);
}
};
getData();
uj5u.com熱心網友回復：
Promise.all只接受一個引數，一個promise陣列。因此，您的第二個引數（帶有methodand的物件headers）將被忽略。該物件需要作為第二個引數傳遞給fetch函式，而不是Promise.all.
嘗試以下操作：
const getData = async (jwt) => {
try {
const fetchOptions = {
method: "GET",
headers: {
"user-agent": "vscode-restclient",
"content-type": "application/json",
accept: "application/json",
authorization:
"Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6MSwibmFtZSI6IkxlYW5uZSBHcmFoYW0iLCJ1c2VybmFtZSI6IkJyZXQiLCJpYXQiOjE1OTY1MDY4OTN9.KDSlP9ALDLvyy0Jfz52x8NePUejWOV_mZS6cq4-JZXs",
},
};
const [response1, response2, response3] = await Promise.all(
[
fetch("http://localhost:3000/api/confirmed", fetchOptions),
fetch("http://localhost:3000/api/deaths", fetchOptions),
fetch("http://localhost:3000/api/recovered", fetchOptions),
],
);
const { data1 } = await response1.json();
const { data2 } = await response2.json();
const { data3 } = await response3.json();
console.log(data1, data2, data3);
} catch (err) {
console.error(`Error: ${err}`);
}
};
getData();
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標籤：javascript api 异步等待 拿来
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