Why does LongPoll not work in VK API?

Question

JavaScript

When trying to get message updates via Long Poll, an error occurs in the console that says a syntax error
The code itself:
//I call the method
vk.method("messages.getLongPollServer", {}, function(data){
let LongPoll = data.response //Save the key, server and ts
console.log(data) //Log them to the console
$.ajax({
url: "https://"+LongPoll.server+"?act=a_check&key="+LongPoll.key+"&ts ="+LongPoll.ts+"&wait=25", //Get data
method: "GET",
dataType: "JSONP",
success: function(resp){
console.log(resp); //Log received data to console
}
});
});

Answer 1

in browser JS you won't be able to use LongPoll due to Same Origin Policy
you need to use Node.JS