您可以使用JS SDK订阅该类型的事件。查看 facebook javascript文档，您的方法正在寻找的是'auth.authResponseChange'：

You can use the JS SDK to subscribe to events of that type. Take a look at the facebook javascript documentation, the method you are looking for is 'auth.authResponseChange' :

FB.Event.subscribe('auth.authResponseChange', function(response) {
  alert('The status of the session is: ' + response.status);
});