【JavaScript】非同期を同期的に書いてみた(async/await)

[code language="javascript"]
import React, { Component } from 'react'
import ReactDOM from 'react-dom'
import 'babel-polyfill';

class Greet extends Component {
render() {
function hidouki(url, num){
return new Promise(function(resolve, reject){
var req = new XMLHttpRequest();
req.open('GET', url);
req.onload = function () {
console.log(num)
if(req.status == 200){
resolve(req.response);
} else {
reject(Error(req.statusText));
}
}
req.onerror = function(){
reject(Error("Network Error"))
}
req.send();
})
}
async function asyncFunction (){
const result = await hidouki('https://localhost:3000/posts', 1);
console.log(result);
const result2 = await hidouki('https://localhost:3000/comments', 2);
console.log(result2);
const result3 = await hidouki('https://localhost:3000/profile', 3);
console.log(result3);
const result4 = await hidouki('https://localhost:3000/state', 4);
console.log(result4);
console.log('done!');
}
asyncFunction();
return (
<ul id='result'></ul>
)
}
}
window.addEventListener('DOMContentLoaded', ()=>{
ReactDOM.render(<Greet />, document.querySelector('main'));
})
[/code]

demoは後ほどこちらにmergeします
次はgeneratorでごにょごにょやろう
あとこれ読む。

でわーーー