Question

也许我有一个愚蠢的问题，但是我想返回带有promise .then和async函数的函数调用，以便以后在express.js上使用它

function search (opts) {
 //const url
 //const callback

return request(url, callback)
.then(res => {
  const promisesAccounts = res.accounts.map( el => request(el, callbackPage));
  const promisesKeyword = res.keyword.map( el => request(el, callbackPage));

  const hello = async () => {

  const obj = {};

  const promiseA = await Promise.all(promisesAccounts);
  const promiseB = await Promise.all(promisesKeyword);
  obj.accounts = promiseA;
  obj.keywords = promiseB;
  console.log(obj);
}
hello()
})
}

也许我可以通过某种方式返回obj以便以后在Express应用程序上使用它：

app.get('/', (req, res) => {
   search()
   .then (result => res.json(result))  //hello async obj result  
})

Answer 1

请尝试：

function search (opts) {

  return request(url, callback)
    .then(res => {
      const promisesAccounts = res.accounts.map( el => request(el, callbackPage));
      const promisesKeyword = res.keyword.map( el => request(el, callbackPage));

      const hello = async () => {

        const obj = {};

        const promiseA = await Promise.all(promisesAccounts);
        const promiseB = await Promise.all(promisesKeyword);
        obj.accounts = promiseA;
        obj.keywords = promiseB;
        console.log(obj);
        return obj;
      }
      return hello()
  })
}

Answer 2

您可以return像这样

function search (opts) {
  //const url
  //const callback

  return request(url, callback)
    .then(res => {
      const promisesAccounts = res.accounts.map( el => request(el, callbackPage));
      const promisesKeyword = res.keyword.map( el => request(el, callbackPage));

      const hello = async () => {
        const obj = {};
        const promiseA = await Promise.all(promisesAccounts);
        const promiseB = await Promise.all(promisesKeyword);
        obj.accounts = promiseA;
        obj.keywords = promiseB;
        console.log(obj);
      }
      return hello;
    })
}

要使用此功能，您可以

request
  .then(async myFunc => {
     const value = await muFunc(parameter_here)
  })

如何通过Promise返回函数调用

2 个答案: