Why, when developing in the market mode on JS, after connecting the library, jQuery does not work and ajax does not work?

Question

JavaScript

When developing in the market mode on JS, after connecting the library, jQuery does not work and ajax requests of the form do not work:

$.ajax({
type: "POST",
url: "..",
data: "text=" + '1',
success: function (html) {
..
}
});

How to solve this problem?

Answer 1

Most likely, XHR is blocked in this environment (other APIs are used).