如果设置了cookie，则Facebook登录Javascript SDK自动登录

我正在尝试设置我的网站，这样当你进入登录页面时，它会检查是否设置了cookie，如果设置了，那么登录应该是自动的——也就是说，当这个页面加载时，它重定向到"Facebook.ashx"，它会创建一个cookie来记住访问令牌。

但是，如果没有设置cookie，则用户必须单击"使用Facebook登录"按钮继续登录，然后继续重定向到"Facebook.ashx"。

这是我的代码-目前它总是在用户接受应用程序并继续"Facebook.ashx"后登录

<div id="fb-root"></div>  
<script type="text/javascript">
    window.fbAsyncInit = function () {
        FB.init({
            appId: 'My_App_ID', // App ID
            status: true, // check login status
            cookie: true, // enable cookies to allow the server to access the session
            xfbml: true  // parse XFBML
        });
        // Additional initialization code here
        FB.Event.subscribe('auth.authResponseChange', 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;
                // TODO: Handle the access token
                // Do a post to the server to finish the logon
                // This is a form post since we don't want to use AJAX
                var form = document.createElement("form");
                var redirect = "FacebookLogin.ashx?redirect=" + document.getElementById('redirect').innerHTML;
                form.setAttribute("method", 'post');
                form.setAttribute("action", redirect);
                var field = document.createElement("input");
                field.setAttribute("type", "hidden");
                field.setAttribute("name", 'accessToken');
                field.setAttribute("value", accessToken);
                form.appendChild(field);
                document.body.appendChild(form);
                form.submit();
            } 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.
            }
        });
    };
  // Load the SDK Asynchronously
  (function(d){
     var js, id = 'facebook-jssdk', ref = d.getElementsByTagName('script')[0];
     if (d.getElementById(id)) {return;}
     js = d.createElement('script'); js.id = id; js.async = true;
     js.src = "//connect.facebook.net/en_US/all.js";
     ref.parentNode.insertBefore(js, ref);
   }(document));
</script>
<div class="fb-login-button" scope="email, publish_stream">Login with Facebook</div>

感谢您提前提供任何帮助。