使用带有FB SDK的require.js

define('fbsdk', function() {
  return {
    load: function(callback) {
      window.fbAsyncInit = function() {
        FB.init({
          appId: 'your-app-id',
          cookie: true,
          xfbml: true,
          version: 'v12.0'
        });
        callback();
      };
      (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'));
    }
  };
});

require(['fbsdk'], function(fbsdk) {
  fbsdk.load(function() {
    FB.getLoginStatus(function(response) {
      if (response.status === 'connected') {
        console.log('User is logged in and connected to the app.');
      } else {
        console.log('User is not logged in.');
      }
    });
  });
});