Facebook-App：设置 FB-cookie/令牌
我有一个 Facebook 应用程序，需要提交一个表格。我只希望用户能够填写一次表格。我想做的是设置一个 cookie + 我想知道是否可以设置类似 FB App-Cookie/令牌之类的东西，它告诉 Javascript 我无法再次提交？
I have a Facebook-App with a form to submit. I only want the users to be able to fill out the form once. What I would like to do is set a cookie + I was wondering if I can set something like a FB App-Cookie/token, that tells Javascript that I can't submit again?
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您的应用程序只是一个常规的 iframe，因此您可以像 Facebook 之外的普通网站一样轻松地设置 cookie。
但不要忘记，您永远不应该信任用户输入，因此您还需要验证服务器上的多个条目 - 通过检查他们的 Facebook 用户 ID 或表单中的某些独特信息（例如用户的例如，电子邮件地址）。
但是，是的，您可以轻松地从 iframe 设置 cookie。不过，您应该进行测试以确保浏览器不会将其作为第三方 cookie 进行阻止。您可以通过将 Firefox 的首选项设置为禁止第三方 cookie 等来轻松测试这一点。
希望这有帮助！
Your app is just a regular iframe, so you can set cookies just as easily as if it were a normal website, outside of Facebook.
Don't forget, though, that you should never trust user input, so you will want to validate against multiple entries on the server as well — either by checking their Facebook user ID or some unique piece of information from your form (like the user's email address, for example).
But yes, you can easily set a cookie from the iframe. You should test to make sure that browsers aren't blocking it as a third-party cookie, though. You can test that easily enough by setting Firefox's preferences to disallow third-party cookies and so on.
Hope this helps!