test.js

var url = "https://api.github.com/repos/awesomeWM/awesome/issues/1395/comments"
var httpRequest

window.document.onload = function makeRequest(url) {
    httpRequest = new XMLHttpRequest()
    
    if (!httpRequest) {
        console.log('Browser do not support an ajax call.')
        return false
    }
    httpRequest.onreadystatechange = callHandler
    httpRequest.open('GET', url)
    httpRequest.send()
}

function worker(data) {
    for (var comment in data) {
        body = comment.body
        console.log(body)
    }
}

function callHandler() {
    if (httpRequest.readyState === XMLHttpRequest.DONE) {
        if (httpRequest.status === 200) {
            worker(JSON.parse(httpRequest.responseText))
        } else {
            console.log('There was a problem with the request.')
        }
    }
}