未捕获的ReferenceError:当使用FB. getloginstatus时没有定义FB

<div id="fb-root"></div>
<script>
    window.fbAsyncInit = function () {
        FB.init({
            appId: '######', // App ID
            status: true, // check login status
            cookie: true, // enable cookies to allow the server to access the session
            xfbml: true  // parse XFBML
        });
    };
    // Load the SDK Asynchronously
    (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));
    FB.getLoginStatus(function (response) {
        if (response.status === 'connected') {
            // the user is logged in and has authenticated 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 uid = response.authResponse.userID;
            var accessToken = response.authResponse.accessToken;
        } else if (response.status === 'not_authorized') {
            // the user is logged in to Facebook,
            // but has not authenticated your app
        } else {
            // the user isn't logged in to Facebook.
        }
    });
</script>

您正在呼叫FB。在SDK被加载和/或初始化之前，getLoginStatus。等待那个，这就是fbAsyncInit事件的作用。所以把方法调用放在这里

在Chrome中，你会得到错误:Uncaught ReferenceError: FB未定义。

我喜欢在Facebook的初始化函数fbAsyncInit()中触发一个自定义事件。然后我就不局限于在fbAsyncInit函数中做所有与FB相关的脚本了。我可以把它放在任何地方，只要监听那个自定义事件被触发。

window.fbAsyncInit = function() {
    FB.init({
        appId      : '123456789',
        status     : true,
        cookie     : true,
        xfbml      : true  
    });
    $(document).trigger('fbload');  //  <---- THIS RIGHT HERE TRIGGERS A CUSTOM EVENT CALLED 'fbload'
};
//MEANWHILE IN $(document).ready()
$(document).on(
    'fbload',  //  <---- HERE'S OUR CUSTOM EVENT BEING LISTENED FOR
    function(){
        //some code that requires the FB object
        //such as...
        FB.getLoginStatus(function(res){
            if( res.status == "connected" ){
                FB.api('/me', function(fbUser) {
                    console.log("Open the pod bay doors, " + fbUser.name + ".");
                });
            }
        });
    }
);

我使用了以下简单的方法，它正常工作:

在head部分，我加载了SDK:

<script type="text/javascript" src="//connect.facebook.net/en_US/sdk.js"></script>

然后在你的页面的body，你的实际内容是，我使用这个:

<script>
  function statusChangeCallback(response) {
    console.log('statusChangeCallback');
    console.log(response);
    if (response.status === 'connected') {
      testAPI();
    } else if (response.status === 'not_authorized') {
      FB.login(function(response) {
        statusChangeCallback2(response);
      }, {scope: 'public_profile,email'});
    } else {
      alert("not connected, not logged into facebook, we don't know");
    }
  }
  function statusChangeCallback2(response) {
    console.log('statusChangeCallback2');
    console.log(response);
    if (response.status === 'connected') {
      testAPI();
    } else if (response.status === 'not_authorized') {
      console.log('still not authorized!');
    } else {
      alert("not connected, not logged into facebook, we don't know");
    }
  }
  function checkLoginState() {
    FB.getLoginStatus(function(response) {
      statusChangeCallback(response);
    });
  }
  function testAPI() {
    console.log('Welcome!  Fetching your information.... ');
    FB.api('/me', function(response) {
      console.log('Successful login for: ' + response.name);
      document.getElementById('status').innerHTML =
        'Thanks for logging in, ' + response.name + '!';
    });
  }
  $(document).ready(function() {
    FB.init({
      appId      : '1119999988888898981989819891',
      xfbml      : true,
      version    : 'v2.2'
    });
    checkLoginState();
  });
</script>

直接在标签

中使用带有facebook sdk的脚本

    <script type="text/javascript" src="//connect.facebook.net/en_US/all.js#xfbml=1&appId=YOUR_APP_ID" id="facebook-jssdk"></script>

我们也面临着同样的问题，由于FB sdk没有加载(或加载延迟)，这在某些情况下会导致问题(或破坏javascript)。

为了解决这个问题，我们委派了所有与facebook有关的电话。我们创建了这样一个函数:

function callOnFBSDKLoad(callback){
    if (window.isFBInitialized) {
        callback();
    }
    else {
        jQuery(document).bind('fbInitialized', callback);
    }
}

其中fbInitialized是自定义事件在这里了解更多关于自定义事件的信息。window.isFBInitialized是加载SDK时设置的变量。

callback是包含FB相关事件的方法。例如

var FBLogin = function(){
   FB.login(...);
}
callOnFBSDKLoad(FBLogin)

PS:请忽略语法和命名约定，我基本上是在分享解决这些问题的想法。

一个更简单可靠的解决方案。在SDK加载时调用一个函数。我将它命名为triggerLoginCheck()。

<script>
  window.fbAsyncInit = function() {
    FB.init({
      //TO DO: Add your unique Facebook app ID (All numbers).
      appId      : '***unique_app_id***',
      cookie     : true,
      xfbml      : true,
      version    : 'v2.8'
    });
    //Call the function here
    triggerLoginCheck();
    FB.AppEvents.logPageView();   
  };
  (function(d, s, id){
     var js, fjs = d.getElementsByTagName(s)[0];
     if (d.getElementById(id)) {return;}
     js = d.createElement(s); js.id = id;
     js.src = "//connect.facebook.net/en_US/sdk.js";
     fjs.parentNode.insertBefore(js, fjs);
   }(document, 'script', 'facebook-jssdk'));
</script>

之后，在任何地方放置:

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

这对我来说很好。必须包含对象"Log.info.bind"

var Log = {info: {bind: function(){alert('Hi');testAPI ();}}}