How to open two popup one at a time when updating the tab?

Question

I intend to use two popup ads on my site, as I do to open one at a time when refreshing the page I tried, but it opens two pop-ups at the same time irritating any visitor, I tried the following script.

(function () {
var isOpened = false;

var siteUrl  = "http://popup1";
var siteUrl  = "http://popup2";

document.addEventListener("click", function(){
    if (!isOpened) {
        isOpened = !!window.open(siteUrl, "_blank");
    }
  });
})();

Answer 1

Sorry for the comment, but using setInterval, an auxiliary variable and a method is simple. Follow an example:

var openedAds = 0;
var AdsToOpen = ['http://popup1','http://popup1'];
var interval;

var interval = setInterval(function(){
    window.open(AdsToOpen[openedAds], "_blank");
    openedAds += 1;
    if(openedAds === AdsToOpen.length){
        clearInterval(interval);
    }
}, 2000); 

Adstoopen are the website you intend to open.
2000 at the end of the code is the time between a popup and another (in ms)