var request = new XMLHttpRequest();

request.open('GET', '/', /* async = */ false);

request.send();

console.log(request.responseText.substring(0, 150));

console.log('...');

function loadDoc() {

var xhttp = new XMLHttpRequest();

xhttp.onreadystatechange = function() {

if (this.readyState == 4 && this.status == 200) {

document.getElementById("demo").innerHTML = this.responseText;

}

};

xhttp.open("GET", "ajax_info.txt", true);

xhttp.send();

}

function getPosts() {

return new Promise(function(resolve, reject) {

var req = new XMLHttpRequest();

req.open('GET', 'https://jsonplaceholder.typicode.com/posts');

req.onload = function() {

if (req.status == 200) {

resolve(JSON.parse(req.response));

}

else {

reject();

}

};

req.send();

})

}

getPosts().then(r =>{

console.log(r);

}).catch(() => {

console.log('Algo salió mal');

});

fetch('http://example.com/movies.json')

.then((response) => {

return response.json();

})

.then((myJson) => {

console.log(myJson);

});