Facebook API：检查用户是否在登录时登录

Question

I have been trying to get my website to check if the user is logged in on page load but I have not been able to get it to work despite following API instructions, here's an example: 我一直试图让我的网站检查用户是否在页面加载时登录，但是尽管遵循API指令我仍然无法使其工作，这是一个例子：

<!DOCTYPE html>
    <html>
        <head>
             <title>My Facebook Login Page</title>
        </head>
        <body>
            <div id="fb-root"></div>
            <script>
                alert('hello');
                window.fbAsyncInit = function() {
                    FB.init({
                        appId  : 'APP_ID',
                        status : true, 
                        cookie : true,
                        xfbml  : true,
                        oauth  : true
                    });

                    FB.getLoginStatus(function( response ) {
                       console.log(response);
                       alert('hello2');  
                    });

                    FB.Event.subscribe('auth.statusChange', function(response) {
                       alert('hello2');
                    });

                    FB.Event.unsubscribe('auth.statusChange');
               };
               (function(d){
                   var js, id = 'facebook-jssdk'; if (d.getElementById(id)) {return;}
                   js = d.createElement('script'); js.id = id; js.async = true;
                   js.src = "//connect.facebook.net/en_US/all.js";
                   d.getElementsByTagName('head')[0].appendChild(js);
               }(document));
           </script>
       </body>
    </html>

The alert is never even hit unless the user is logged in, if he is logged out, this alert or anything that would be inside that code block never triggers. 除非用户已登录，否则警报永远不会被命中，如果他已注销，则此警报或该代码块内的任何内容都不会触发。

Answer 1

In your example above remove the trailing comma (oauth: true,) // that might just be from copy/paste but want to eliminate any gotchas 在上面的例子中删除尾随的逗号（oauth：true，）//可能只是来自复制/粘贴，但想要消除任何陷阱

For debugging, console logging is my preferred method but since you're not even seeing alerts, your situation is a little bit tricky. 对于调试，控制台日志记录是我的首选方法，但由于您甚至没有看到警报，因此您的情况有点棘手。

FB.Event.subscribe("auth.statusChange", function(response) {
  console.log(response);
});

FB.Event.unsubscribe("auth.statusChange");
// If you were to get subscribe to work, think about unsubscribing at some point to, since most likely that's only for an initial check

Alternatively, try using the getLoginStatus instead of the event subscription. 或者，尝试使用getLoginStatus而不是事件订阅。

FB.getLoginStatus(function( response ) {
    console.log(response);  
});

Response should give you an object and you can check response.status and its possible values are: connected, not_authorized or unknown response.authResponse will include properties like: accessToken, expiresIn, etc. 响应应该为您提供一个对象，您可以检查response.status及其可能的值是：connected，not_authorized或unknown response.authResponse将包含以下属性：accessToken，expiresIn等。

Facebook API：检查用户是否在登录时登录

问题描述

1 个解决方案

解决方案1
0 2012-05-01 21:41:29

Facebook API：检查用户是否在登录时登录

问题描述

1 个解决方案

解决方案1 0 2012-05-01 21:41:29

解决方案1
0 2012-05-01 21:41:29