how to get email id of Facebook user using javascript sdk

Question

I am using JavaScript API to create my app for Facebook. The problem is, it\'s returning
email = undefined.

I don\'t know why? And if I use Facebo

Answer 1

In this code i have get user data form facebook and store into my database using ajax

 FB.login(function(response) {
          if (response.authResponse) {
         FB.api('/me?fields=email,name,first_name,last_name', function(response) 
         {
             FB.api(
             "/"+response.id+"/picture?height=100",
                                    function (responses) {
                                        //console.log(responses.data.url)
                                                    response['profile_pic']=responses.data.url;
                                        $.ajax({
                                                   type:"POST",
                                                   url:''+'home/facebook_get_signup',
                                                   data:response,
                                                   success:function(res)
                                                   {
                                                       if(res=='success')
                                                       {

                                                           window.location='';
                                                       }
                                                       if(res=='exists')
                                                       {
                                                           window.location='';  
                                                       }
                                                   }
                                               });

                                    }
                                )
         });
        } else {
         console.log('User cancelled login or did not fully authorize.');
        } 
      // handle the response
        }, {scope: 'email,user_likes'});