[英]ReactJS componentDidMount, Fetch Spotify API and Promise
我正在学习如何使用ReactJS,Spotify API和Promise。 我正在尝试在Spotify上获取音乐家热门专辑并播放30秒的曲目。
我正在使用一个名为spotify-web-api-node的Spotify软件包,我想我不了解React或JS的基本内容。 Syntax error: Unexpected token, expected ( (11:8)
从'react'导入React;
import SpotifyWebApi from 'spotify-web-api-node';
require('dotenv').config();
export default class SpotifyComponent extends React.Component {
// Create the api object with the credentials
const spotifyApi = new SpotifyWebApi({
clientId : process.env.REACT_APP_SPOTIFY_CLIENT_ID,
clientSecret : process.env.REACT_APP_SPOTIFY_CLIENT_SECRET
});
// Save the access token so that it's used in future calls
componentDidMount() {
**(11:8)** --> return spotifyApi = new Promise((resolve, reject) => {
spotifyApi.clientCredentialsGrant()
.then( => (data) {
console.log('The access token expires in ' + data.body['expires_in']);
console.log('The access token is ' + data.body['access_token']);
});
// using Promises through Promise, Q or when - get Elvis' albums in range [20...29]
spotifyApi.getArtistAlbums('43ZHCT0cAZBISjO8DG9PnE', {limit: 10, offset: 20})
.then(function(data) {
console.log('Album information', data);
}, function(err) {
console.error(err);
});
});
SpotifyWebApi.setPromiseImplementation(Q);
}
}
你使用spotify-api
提供的承诺的方式是正确的。 但是,您不应该从componentDidMount
返回Promise
。 React
没有任何用处。
而只是在componentDidMount
运行基于promise的函数。
componentDidMount() {
// the next line will actually trigger the promise to run
spotifyApi.clientCredentialsGrant()
.then((data) => { // this line was missing "=>" in your original code
console.log('The access token expires in ' + data.body['expires_in']);
console.log('The access token is ' + data.body['access_token']);
});
// the next line also triggers a promise to run
spotifyApi.getArtistAlbums('43ZHCT0cAZBISjO8DG9PnE', {limit: 10, offset: 20})
.then(function(data) {
console.log('Album information', data);
}, function(err) {
console.error(err);
});
}
您也可以在导入后立即将Q
设置为承诺提供商。
import SpotifyWebApi from 'spotify-web-api-node';
SpotifyWebApi.setPromiseImplementation(Q);
你不能在类这样的类中有一个const
定义。
您应该将其移到外面或删除const
:
// Create the api object with the credentials
const spotifyApi = new SpotifyWebApi({
clientId : process.env.REACT_APP_SPOTIFY_CLIENT_ID,
clientSecret : process.env.REACT_APP_SPOTIFY_CLIENT_SECRET
});
export default class SpotifyComponent extends React.Component {
要么
export default class SpotifyComponent extends React.Component {
// Create the api object with the credentials
spotifyApi = new SpotifyWebApi({
clientId : process.env.REACT_APP_SPOTIFY_CLIENT_ID,
clientSecret : process.env.REACT_APP_SPOTIFY_CLIENT_SECRET
});
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