Facebook graph api 当用户到达我已经登录的facebook应用时，如何检测已取消的权限请求？

我一直在测试javascript sdk的身份验证/登录代码，我注意到facebook只在用户到达我的未登录facebook的应用程序时检测到已取消的权限请求，但如果用户已经登录facebook，并且他们取消了相同的权限请求，FB.login不会返回“未知”在第一个条件下的状态

$("button").click(function(){            

    FB.login(function(response) {

        /*when the user clicks the button but isn't logged in, fb will prompt
        them to log in and then shows the dialogue where I request
        permissions. If I hit cancel, the response status will return
        "unknown" and I redirect to another page. */    

        if(response.status === "unknown"){
            top.location.href = "https://developers.facebook.com/docs/facebook-login/access-tokens/";

        }else{
            /*However if the user is already logged in and the permissions
            request is cancelled, the code goes into this block that is meant to
            handle a "connected" response */

            console.log("connected");                           
            },{scope: 'user_location,user_likes'});

    });

---

当我尝试测试验证响应时，我发现自己忽略了什么，如果我到达我的应用程序并已登录，然后取消了授权，那么我将得到验证响应。我需要确保我还没有授权这个应用！！！是吗？！！不管是谁，我需要从我的fb主页上的person应用列表中删除该应用，然后我就可以进入我的登录页，就好像我是一个新用户一样

FB.login(function(response) {
               console.log(response);

              if(response.status === "connected"){

                 //here I have ajax method for passing the signed request to my php page



               }else if(response.status === "not_authorized"){

//if they arrive logged in, are prompted to accept permissions, then cancel 
    //permissions request  

                   console.log("authCancelled");

                   }

                   else{


              //if user arrives at app not logged in they'll be prompted to log in,
    // if they log in and then cancel the permissions request, I'll get an auth response of "unknown" 
//and then I redirect the page.

                   top.location.href = "my redirect url";


              }

     },{scope: 'user_location,user_likes'}); 



  }); 

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如果您想验证您是否被授予了所有需要的权限，那么您可以进行类似于

FB.api（'/me/permissions'，function（perms）{…}）的api调用