javascript - 如何在 Expressjs、Typescript 中将 for 循环的 Promise 结果赋值给外部变量？

export const getSObjectFields = async (request: Request, response: Response) => {
if (!request.body) { return response.status(401).json({ error: 'No SObject Selected' }); }
let selectedSObject = request.body;
let sObjectsDetails: any = [];
selectedSObject.forEach((element: string, _index: number) => {
    let promiseDescribeSObject = describeSObject(request, response, element);
    promiseDescribeSObject.then((res) => {
        sObjectsDetails.push(res);
    }).catch((err) => {
        console.error('Error: ', err);
    });
});
return response.status(200).json(sObjectsDetails);

}

我确实有一个函数，它使用参数 describeSObject(request, response, 'objectName') 调用一个 API。我想遍历 describeSObject 函数，并将结果保存到 for 循环外的变量中。

答案＃1

你可以使用 async/await 语法，并使用 map 和 Promise.all 一起解决数组中的所有 promise。

export const getSObjectFields = async (request: Request, response: Response) => {
  if (!request.body) { return response.status(401).json({ error: 'No SObject Selected' }); }
  let selectedSObject = request.body;
  let sObjectsDetails = await Promise.all(selectedSObject.map(async (element: string) => await describeSObject(request, response, element)))
  return response.status(200).json(sObjectsDetails);
}