How to make an event after the creation of every 9th record?

Question

JavaScript

Friends, how in Js you can make it so that when you add, say, every 9th record, this or that event occurs, another element is added to the page, for example. Only everything happens asynchronously, after each SMS added by ajax, you need to look, if it is the 9th, add an element to the page, if 18, then one more, and so on ... There are no static variables in js, how not to be tell?

Answer 1

There are global variables.

var MyGlobalVariable = 0;
(function(){
  MyGlobalVariable ++;
  if(MyGlobalVariable % 9 == 0){
    alert('Супер приз!');
  }
})();

And so at any point in the js code.