1）您也可以使用这样的代码重新登录（请注意 auth.login event）：

1) You can also redirect on login using some code like this (note the auth.login event):

 <script src="http://connect.facebook.net/en_US/all.js">
  </script>
  <script>
      FB.init({
          appId: '??????????????', cookie: true,
          status: true, xfbml: true
      });
      FB.Event.subscribe('auth.login', function () {
          window.location = "http://example.com";
      });
  </script>
  <fb:login-button>
     Login with Facebook
  </fb:login-button>

2）要确定是否显示或隐藏登录按钮，可以使用 FB.getLoginStatus 来发现用户是否登录。以下页面可能会被使用： http://developers.facebook.com/docs/reference/javascript/FB.getLoginStatus/

2) To determine whether to show or hide the login button, you can use FB.getLoginStatus to discover whether the user is logged in. The following page might be of use: http://developers.facebook.com/docs/reference/javascript/FB.getLoginStatus/