A funny windows monitor ! visibilitychange

When the user left the web page, you will find an interesting alter to complain to you:

This is how to work to attract the user as a small and unpopular web app:

window.addEventListener('visibilitychange', function() {
  if (document.visibilityState === "hidden") {
    //when you left the page
    alert('Cruel, heartless, you abandoned me alone! ☆*: .｡. o(≧▽≦)o .｡.:*☆')
  }else if (document.visibilityState === "visible") {
    //when you went back the page
    console.log('Master! Welcome, let me service to you ヾ(≧▽≦*)o');
  }
});