Question

我有这段代码：

getThirdPartyID : function () {                     
    return FB.api("/me?fields=third_party_id", function (userData) { 
        console.debug("Your Facebook ThirdPartyId is: " + userData["third_party_id"]);
        return userData["third_party_id"];
    });
},

但它返回空。这个代码有什么问题？我怎样才能以同样的想法访问它？ TNX

Answer 1

FB.api是对Facebook API进行异步请求并且不返回任何内容的函数。您只能在callback内获得结果。您应该利用不同的方法来实现这一点：

var someObj = {
  getThirdPartyID : function (thirdPartyIDCallback) {
    return FB.api("/me?fields=third_party_id", function (userData) { 
      console.debug("Your Facebook ThirdPartyId is: " + userData["third_party_id"]);
      thirdPartyIDCallback(userData["third_party_id"]);
    });
  }
}

var handleThirdPartyID = function(thirdPartyID){
  // do something with thirdPartyID
  alert(thirdPartyID);
}
someObj.getThirdPartyID(handleThirdPartyID);

Answer 2

FB.api工作异步。这意味着函数在FB.api回调函数返回之前返回。

您应该将FB.api的返回值设置为变量或调用FB.api回调函数内的其他函数。

function GetUserData(val){
 alert(val);
}
getThirdPartyID : function () {                     
    FB.api("/me?fields=third_party_id", function (userData) { 
        console.debug("Your Facebook ThirdPartyId is: " + userData["third_party_id"]);
        GetUserData(userData["third_party_id"]);
    });


};

使用自定义函数从FB.api调用返回查询结果

2 个答案: