Question

我想从函数“ accesstokenAuth（）”中取回值“ bearerToken”。我的问题是，即使我返回/解析它，我也不知道如何从函数中获取该值。这是我的代码：

const SpotifyWebApi = require('spotify-web-api-node');
const http = require("http");
const request = require('request');
const querystring = require('querystring');
const { post } = require('request');
const express = require('express');
const { response } = require('express');
const https = require('follow-redirects').https;


//sets express server vars
const app = express()
const port = 8080

app.get('/', (req, res) => {
  res.send('Server Connected')
})

app.listen(port, () => {
  console.log(`Now serving on ${port} at ${process.env.URI} `)
})


require('dotenv').config();


//authenticate to SpotifyAPI
var spotifyApi = new SpotifyWebApi({
  clientId: process.env.CLIENT_ID,
  clientSecret: process.env.SECRET_ID,
  redirectUri: process.env.URI,
});

const scope = 'user-read-private user-read-email ';
const authUrl = 'https://accounts.spotify.com/api/token?grant_type=client_credentials';

//Headers needed to auth to SpotifyAPI for Bearer token
const tokenHeaders = {
  'Authorization': process.env.ACCESSTOKEN,
  'Content-Type': 'application/x-www-form-urlencoded',

};


//spotify Auth Payload
const options = {
  'method': 'POST',
  'url': authUrl,
  'headers': tokenHeaders
};

//does the function that calls this function need to be async??
const accessToken = async function accessTokenAuth() {
  return new Promise((resolve) => {
     request(options, (error, response) => {
        if (error) throw new Error(error);
        const accessTokenBody = response.body;
        const obj = JSON.parse(accessTokenBody);
        const bearerToken = ("Bearer " + obj.access_token);
        resolve(bearerToken)
     });
  })
}

let bearer = bearerToken;
console.log(bearer)



//Add first playlists request using the bearer token



const playlistUrl = 'https://api.spotify.com/v1/me/playlists'

const playlistHeaders = {
  'Authorization': bearer,
  'Content-Type': 'application/x-www-form-urlencoded'
}

const playlistAuth = {
  'method':'GET',
  'url': playlistUrl,
  'headers': playlistHeaders

}




function getUserPlaylists() {
  request( playlistAuth, (error, response) => {
    if (error) throw new Error(error);
    const userPlaylistData = response.body;
    console.log(userPlaylistData)

  });
}

getUserPlaylists()

如您所见，我需要获取“ bearerToken”值，然后将其提供给名为“ getUserPlaylist”的函数，以便在进行身份验证后获得更多数据。谢谢！

Answer 1

变量bearerToken超出了范围，因为它的范围在您的函数之内。

如果您在功能内return resolve(bearerToken)，则accessToken应该等于您的bearerToken。

旁注，您可以像这样重写函数。

我可能错了，但我不认为你需要诺言。

const accessToken = () => request(options, (error, response) => {
  console.log({options, response});
  if (error) throw new Error(error);
  
  const accessTokenBody = response.body;
  const obj = JSON.parse(accessTokenBody);
  const bearerToken = ("Bearer " + obj.access_token);
  return bearerToken;
});

似乎无法访问功能之外的值，nodejs

1 个答案: