我正在嘗試檢索存盤在以下 API 中的 JSON 資料：
https://api.hatchways.io/assessment/blog/posts
使用 node.js 和 https 請求，我不斷收到 [ Promise { }, Promise { } ] 的陣列。不幸的是，我一次只能搜索一個標簽，并且在對帖子進行排序之前，我必須從提供的標簽串列中檢索至少具有一個標簽的帖子串列。我的代碼如下：
const express = require('express');
const app = express();
app.get("/api/ping", (req, res) => {
res.status(200).send("{\"success\": true}");
})
app.get("/api/posts", (req, res) => {
const tags = req.query.tags;
const sortBy = req.query.sortBy;
const direction = req.query.direction;
if (!tags) res.status(400).send("Must provide at least one tag.");
let tag_array = tags.split(',');
let posts_array = [];
tag_array.forEach(tag => {
let posts = getPost(tag);
posts_array.push(posts);
})
console.log(posts_array);
})
app.listen(3000, () => console.log("Listening on port 3000..."));
function getPost(tag) {
const https = require('https');
return new Promise( (resolve, reject) => {
const options = {
hostname: 'api.hatchways.io',
path: `/assessment/blog/posts?tag=${tag}`
}
let body = [];
const req = https.request(options, res => {
res.on('data', data => {
body.push(data);
});
res.on('end', () => {
try {
body = JSON.parse(Buffer.concat(body).toString());
} catch (error) {
reject(error);
}
resolve(body);
});
});
req.on('error', error => {
reject(error);
});
req.end();
}).then(function(data) { return data; }, function(error) { console.log(error) });
}
uj5u.com熱心網友回復：
getPost 方法正在回傳一個承諾，只需執行以下操作：
app.get("/api/posts", async (req, res) => {
const tags = req.query.tags;
const sortBy = req.query.sortBy;
const direction = req.query.direction;
if (!tags) res.status(400).send("Must provide at least one tag.");
let tag_array = tags.split(',');
const promises = [];
tag_array.forEach(tag => {
promises.push(getPost(tag))
});
posts_array = await Promise.all(promises)
console.log(posts_array)
})
uj5u.com熱心網友回復：
只需等待使用await關鍵字解決所有承諾。
app.get("/api/posts", async (req, res) => { // Add the async keyword
//... Skipped some code for concision
tag_array.forEach(tag => {
let posts = getPost(tag);
posts_array.push(posts);
})
await Promise.all(posts_array) // Add this to await all promises to resolve
console.log(posts_array);
})
轉載請註明出處，本文鏈接：https://www.uj5u.com/ruanti/447611.html
標籤：javascript 节点.js 表示