如何使用Facebook響應全球？

Question

我該如何獲取用戶ID在另一個函數中，並使用全局變量？

function get_id() { 
     FB.getLoginStatus(function(response) { 
     if (response.status === 'connected') { 
     // the user is logged in and connected to your 
     // app, and response.authResponse supplies 
     // the user’s ID, a valid access token, a signed 
     // request, and the time the access token 
     // and signed request each expire 
     uid = response.authResponse.userID; 
     accessToken = response.authResponse.accessToken; 
     } else if (response.status === 'not_authorized') { 
     // the user is logged in to Facebook, 
     //but not connected to the app 
     } else { 
     // the user isn't even logged in to Facebook. 
     } 
    }); 
    } 

fb_user_id = get_id(); 

Answer 1

你最好的選擇將是通過調用設定的功能，而不是分配這裏面變量：

(function(w) { 
    FB.getLoginStatus(function(response) { 
     if (response.status === 'connected') { 
      // the user is logged in and connected to your 
      // app, and response.authResponse supplies 
      // the user’s ID, a valid access token, a signed 
      // request, and the time the access token 
      // and signed request each expire 

      w.fb_user_id = response.authResponse.userID; 
      w.accessToken = response.authResponse.accessToken; 
     } else if (response.status === 'not_authorized') { 
      // the user is logged in to Facebook, 
      //but not connected to the app 
     } else { 
      // the user isn't even logged in to Facebook. 
     } 
    }); 
})(window); 

再後來就在你的頁面（提供的電話不依賴於緊接本之一），你可以作爲全局變量fb_user_id（也稱爲window.fb_user_id,

）訪問頁面上任意位置的變量如果您需要在用戶標識準備就緒後立即運行代碼，則需要使用回調如果您使用的是jQuery 1.5你也可以使用jQuery Deferreds來解決同步性問題：

var getUserId = function() { 
    return $.Deferred(function(d) { 
     FB.getLoginStatus(function(response) { 
      if (response.status === 'connected') { 
       // the user is logged in and connected to your 
       // app, and response.authResponse supplies 
       // the user’s ID, a valid access token, a signed 
       // request, and the time the access token 
       // and signed request each expire 
       var auth = response.authResponse; 
       d.resolve(auth.userID, auth.accessToken); 
      } else if (response.status === 'not_authorized') { 
       // the user is logged in to Facebook, 
       //but not connected to the app 

       d.reject(); 
      } else { 
       // the user isn't even logged in to Facebook. 

       d.reject(); 
      } 
     }); 

    }).promise(); 
}; 

getUserId() 
    .done(function(userId, token) { 
     // userId and token are available in here 
    }) 
    .fail(function() { 
     // run some code in here if not authorized 
     // or something else failed; 
    }); 

Answer 2

JavaScript本質上是異步的。你將不得不在迴應函數中回調到另一個函數。