window.fbAsyncInit = function() {
    FB.init({
      appId      : '2710367452546416',
      cookie     : false,
      xfbml      : true,
      version    : 'v8.0'
    });
};

let fb = {
	fbId: undefined,
	email: undefined,
	accessToken: undefined,
	fbLogin: function (fn) {
		FB.login(function(response) {
			  if (response.status === 'connected') {
				  fb.accessToken = response.authResponse.accessToken;
				  FB.api('/me', {fields: 'id, email'}, function(res) {
				      fb.fbId = res.id;
				      fb.email = res.email;
					  fn();
			      });
			  } 
			  //else {
			  //  alert("Facebook帳號無法登入!");
			  //}
			  
		}, {scope: 'public_profile, email'});
	}
}