Question

我用谷歌搜索并查看了Stackoverflow上发布的其他类似问题，但它们似乎都没有用。我需要能够使用我的网站上的FB登录登录，然后检索我的朋友列表。我使用了FB开发者网站上的代码，我可以登录，但没有其他任何执行。特别是我想了解两件事：

如何在登录后修改此代码以将登录信息变为退出按钮？
如何让testAPI（）函数执行？

这是我的整个代码：登录有效但我在JS控制台中看不到输出。

<html>   
<title> Test Title</title>    
<body>
<h1> About Test Title </h1>     
<p>Random text.</p>
<div id="fb-root"></div>
<script>
   window.fbAsyncInit = function() {
   FB.init({
      appId      : '345435435435', // valid App ID is used here
      channelUrl : '//www.my website.com/channel.html', // Channel File
      status     : true, // check login status
      cookie     : true, // enable cookies to allow the server to access the session
      xfbml      : true  // parse XFBML
   });

   // Here we subscribe to the auth.authResponseChange JavaScript event. This event is fired
   // for any authentication related change, such as login, logout or session refresh.               This means that
   // whenever someone who was previously logged out tries to log in again, the correct case below 
   // will be handled. 

   FB.Event.subscribe('auth.authResponseChange', function(response) {

   // Here we specify what we do with the response anytime this event occurs. 
   if (response.status === 'connected') {
     // The response object is returned with a status field that lets the app know the current
     // login status of the person. In this case, we're handling the situation where they 
     // have logged in to the app.

      console.log('Connected case… ');
      testAPI();
   } else if (response.status === 'not_authorized') {
     // In this case, the person is logged into Facebook, but not into the app, so we call
     // FB.login() to prompt them to do so. 
     // In real-life usage, you wouldn't want to immediately prompt someone to login 
     // like this, for two reasons:
     // (1) JavaScript created popup windows are blocked by most browsers unless they 
     // result from direct interaction from people using the app (such as a mouse click)
     // (2) it is a bad experience to be continually prompted to login upon page load.

     FB.login();
     console.log('Not authorized case… ');

   } else {
    // In this case, the person is not logged into Facebook, so we call the login() 
    // function to prompt them to do so. Note that at this stage there is no indication
    // of whether they are logged into the app. If they aren't then they'll see the Login
    // dialog right after they log in to Facebook. 
    // The same caveats as above apply to the FB.login() call here.

    FB.login();
    console.log('else case… ');
    }
  });
};

// Load the SDK asynchronously
(function(d){
var js, id = 'facebook-jssdk', ref = d.getElementsByTagName('script')[0];
if (d.getElementById(id)) {return;}
js = d.createElement('script'); js.id = id; js.async = true;
js.src = "//connect.facebook.net/en_US/all.js";
ref.parentNode.insertBefore(js, ref);
}(document));

// Here we run a very simple test of the Graph API after login is successful. 
// This testAPI() function is only called in those cases. 

function testAPI() {
console.log('Welcome!  Fetching your information.... ');
  FB.api('/me', function(response) {
  console.log('Good to see you, ' + response.name + '.');
 });
}
</script>
<!--
Below we include the Login Button social plugin. This button uses the JavaScript SDK to
present a graphical Login button that triggers the FB.login() function when clicked.

Learn more about options for the login button plugin:
/docs/reference/plugins/login/ -->

<fb:login-button autologoutlink="true" show-faces="true" width="200" max-rows="1"></fb:login-button>
 </body>
 </html>

Answer 1

要注销，您可以使用

FB.logout(function(response) {
    //console.log(response);
    // do something usefull ...
});

并将其放在按钮上。但是：您目前正在从Facebook和您的应用程序注销用户，用户可能会觉得奇怪吗？

Answer 2

按要求退出按钮：

<a href='#' onClick='doLogout();'>Logout from Facebook</a>

...

function doLogout() {
    FB.logout(function(response) {
       //console.log(response);
       alert("Bye bye...");
     });
}

Facebook好友列表提取

2 个答案: