Asynchronous fetch JSON data from URLs with Promises (XMLHttpRequest)

urlJsonFetcherAsyncXML.js

// Get data from list of URL's in asynchronous.

function asyncRequester(url) {
    return new Promise((resolve, reject) => {
        const xhr = new XMLHttpRequest();
        xhr.open("GET", url);
        xhr.onload = () => resolve(xhr.responseText);
        xhr.onerror = () => reject(xhr.statusText);
        xhr.send();
    });
}

var urls = ['temp.json', 'temp.json', 'temp.json', 'temp.json', 'temp.json'],
    pall = [],
    resu = document.querySelector('#results');

for(var i in urls) {
    pall.push(asyncRequester(urls[i]));
}

Promise.all(pall).then(function(results) {
    for(var i in results) {
        var json = JSON.parse(results[i]),
            li = document.createElement('li'),
            text = document.createTextNode(json[0]['title']['rendered']);
        li.appendChild(text);
        resu.appendChild(li);
    }
});