How to implement GET ( POST ) without JQUERY, libraries, on pure JAVASCRIPT?

Question

JavaScript

The question is completely professional, who knows or met with this solution?

1
$.ajax({type : 'POST',url : 'process.php', data : postForm....
2 (условно но достаточно)
$(".refresh").click(function() { $(".all").load('t.php');

Or even so, without asking.. Example.

$.getJSON('json/test2.json', function(data) {for(var i=0;i<data.users2.length;i++){

Answer 1

https://learn.javascript.ru/ajax-xmlhttprequest
https://learn.javascript.ru/fetch