如何通过API检索Facebook中的所有电子邮件地址
问题描述：
Facebook用户可以添加多个电子邮件地址。我知道，通过扩展的电子邮件权限，您可以通过图形API检索主电子邮件地址。如何检索其余的电子邮件地址？这对我的应用程序很重要，所以我可以在我的数据库中找到他们现有的帐户，而不是不必要地创建一个新帐户。
Facebook users can add multiple email addresses. I know, with the extended "email" permission, you can retrieve the primary email address through the graph API. How do you retrieve the rest of the email addresses? This is important for my app so that I can find their existing account in my database rather than unnecessarily creating a new account.