Custom get httpRequest

gistfile1.txt

function customGet ( url, cb ) {

    var xmlhttp = new XMLHttpRequest();
    xmlhttp.onreadystatechange = function() {
        if (this.readyState == 4 && this.status == 200) {
            var data = JSON.parse(xmlhttp.response);
            cb(data);
        }
    };
    xmlhttp.open("GET", url, true);
    xmlhttp.send();
}


customGet('./ajax_info.json', function ( response ) {
    var all = 0;
    for (var key = 0; key < response.length; key++) {
        console.log('key', key, '\ndata', response[key]);
        all += response[key].age;
    }
});

 axios.get(this.url)
                    .then(response => response.data)
                    .then(response => {
                    this.employees = response
            })