为fb.ui创建增量计数器

Question

<script>
  window.fbAsyncInit = function() {
    FB.init({
      appId            : '2125175191100353',
      autoLogAppEvents : true,
      xfbml            : true,
      version          : 'v3.0'
    });
  };

  (function(d, s, id){
     var js, fjs = d.getElementsByTagName(s)[0];
     if (d.getElementById(id)) {return;}
     js = d.createElement(s); js.id = id;
     js.src = "https://connect.facebook.net/en_US/sdk.js";
     fjs.parentNode.insertBefore(js, fjs);
   }(document, 'script', 'facebook-jssdk'));
</script>

 
 
 
 <h1 class="heading-shares">0</h1>
 
 <div class="social-icon"><div id="shareBtn" class="btn btn-success clearfix"><p> share</p></div></div>
 

<script>
document.getElementById('shareBtn2').onclick = function() {
  FB.ui({
    method: 'share',
    display: 'popup',
    href: 'https://www.youtube.com/watch?v=KO7Elfvr-Ys',
 
  }, function(response){
      
      if (response && response.post_id) {
    alert('Post was published.');
  } else {
    alert('Post was not published.');
  }
      
  });
}
</script>

我正在尝试为用户成功将内容共享到Facebook时创建自定义共享计数器。我将如何设置事件处理程序或侦听器以使其正常工作？

如果用户不共享帖子，则计数器应保持为0，但如果共享成功，则增量计数器应添加1