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i have a problem , my Facebook login button does not work in some browsers like firefox or on mobile devices and the consolue shows a javascript error fb is not defined i tried fixing many times, read many blogs but failed , can someone sort the issue in my code here is the script i added in view . the error is at the last line of the script

 <script>



  // This is called with the results from from FB.getLoginStatus().

  function statusChangeCallback(response) {



    console.log(response);

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





      testAPI();



    } else {

      // The person is not logged into your app or we are unable to tell.



    }

  }



  // This function is called when someone finishes with the Login

  // Button.  See the onlogin handler attached to it in the sample

  // code below.

  function checkLoginState() {

    FB.getLoginStatus(function(response) {

      statusChangeCallback(response);

    });

  }



  window.fbAsyncInit = function() {

    FB.init({

      appId      : '***********************',

      cookie     : true,  // enable cookies to allow the server to access 

                          // the session

      xfbml      : true,  // parse social plugins on this page

      version    : 'v3.1' // use graph api version 2.8

    });



    // Now that we've initialized the JavaScript SDK, we call 

    // FB.getLoginStatus().  This function gets the state of the

    // person visiting this page and can return one of three states to

    // the callback you provide.  They can be:

    //

    // 1. Logged into your app ('connected')

    // 2. Logged into Facebook, but not your app ('not_authorized')

    // 3. Not logged into Facebook and can't tell if they are logged into

    //    your app or not.

    //

    // These three cases are handled in the callback function.



    FB.getLoginStatus(function(response) {

      statusChangeCallback(response);

    });



  };



  // Load the SDK asynchronously

  (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 = "https://connect.facebook.net/en_US/sdk.js";

    fjs.parentNode.insertBefore(js, fjs);

  }(document, 'script', 'facebook-jssdk'));



  // Here we run a very simple test of the Graph API after login is

  // successful.  See statusChangeCallback() for when this call is made.

  function testAPI() {

    //console.log('Welcome!  Fetching your information.... ');

    FB.api('/me?fields=name,email,first_name,last_name', function(response) {

        console.log(response);

        //document.getElementById('status').innerHTML = 'Thanks for logging in, ' + response.email + '!';

        document.getElementById("fbuid").value=response.id;

        document.getElementById("first_name").value=response.first_name;

        document.getElementById("last_name").value=response.last_name;

        document.getElementById("fb_email").value=response.email;

        //if(response.email){

            document.getElementById("fblogin").submit();

        //}

    });

  }



  document.getElementById('test').addEventListener('click', function() {

    //do the login

    FB.login(statusChangeCallback, {scope: 'email,public_profile', 

  return_scopes: true});

}, false);

</script>