javascript - angularfire not working with me , I don't know why? -


the html code - call required libraries

    <!doctype html> <html>     <head>          <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.15/angular.min.js"></script>          <script type="text/javascript" src="https://www.gstatic.com/firebasejs/3.0.0/firebase.js"></script>          <script type="text/javascript" src="https://cdn.firebase.com/libs/angularfire/1.2.0/angularfire.min.js"></script>           <script type="text/javascript" src="js/app.js"></script>     </head>     <body ng-app="seworko">             <div ng-controller="users">                 {{ 4+4 }}             </div>     </body> </html>

the javascript code

    var app = angular.module("seworko", ["firebase"]);      var config = {     apikey:"mykey",     authdomain:"mydomain.firebaseio.com",     databaseurl:"https://myurl.firebaseio.com",     storagebucket:"mybucket.com"};     firebase.initializeapp(config);  app.controller("users", function($scope, $firebaseobject) {     try         {             const rootref = firebase.database().ref().child('system');             const ref = rootref.child('global');             this.global = $firebaseobject(ref);         }     catch(e)         {             alert(e);//type error a.ref not function         } });

i getting error -> type error a.ref not function !!

i don't know reason error followed many tutorials , , can't connect firebase angularjs using angularfire


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