showmethepopups.js

function setCookie(cname, cvalue, exdays) {
  var d = new Date();
  d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
  var expires = "expires="+d.toUTCString();
  document.cookie = cname + "=" + cvalue + ";" + expires + ";path=/";
}

function getCookie(cname) {
  var name = cname + "=";
  var ca = document.cookie.split(';');
  for(var i = 0; i < ca.length; i++) {
    var c = ca[i];
    while (c.charAt(0) == ' ') {
      c = c.substring(1);
    }
    if (c.indexOf(name) == 0) {
      return c.substring(name.length, c.length);
    }
  }
  return ""; // HAS NO COOKIE
}

const THE_COOKIE_NAME = 'hasSeenBlackFriday2019'

if (getCookie(THE_COOKIE_NAME) === 'seen') {
if (getCookie(THE_COOKIE_NAME) !== "") {
  // DO NOT SHOW POPUP!!!
} else {
  // SHOW POPUP!!  
  // THEN SET COOKIE
  setCookie(THE_COOKIE_NAME, 'seen', 30)  
}

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