我需要从快速实现的 API 中获取一个值。问题是我编写的代码总是给我带来相同的值。我尝试了两种方法:
var fetch = require("node-fetch");
for(let i=0; i<5; i++){
setTimeout(function(){}, 3000);
fetch('https://api.binance.com/api/v3/avgPrice?symbol=ETHBTC')
.then(res => res.json())
.then(data => {console.log(data.price)});
}
并以同步方式:
var fetch = require("node-fetch");
var request = async () => {
var response = await fetch('https://api.binance.com/api/v3/avgPrice?
symbol=ETHBTC');
var json = await response.json();
console.log(json.price);
}
for(let i=0; i<5; i++) {
setTimeout(function(){request();}, 3000);
}
但我总是得到这样的东西:
0.03244206
0.03244206
0.03244206
0.03244206
0.03244206
有什么建议吗?
最佳答案
您需要了解 setTimeout 不会停止循环的执行...循环将所有超时设置为依次执行
const fetch = require("node-fetch");
let i = 0, times = 5;
const interval = setInterval(() => {
if (++i < times) clearInterval(interval);
fetch('https://api.binance.com/api/v3/avgPricesymbol=ETHBTC')
.then(res => res.json())
.then(data => {console.log(data.price)});
},3000);
使用异步/等待:
const fetch = require("node-fetch");
let i = 0, times = 5;
const interval = setInterval(async () => {
if (++i < times) clearInterval(interval);
const response = await fetch("https://api.binance.com/api/v3/avgPricesymbol=ETHBTC");
const json = await response.json();
console.log(json);
},3000);
关于javascript - 使用 Node 获取的动态请求,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54609378/