<script>

         var m = "roboce";

         if(m === "roboce"){

             var k = "haha";

         }

         var a = function() {

             var aa = "aa";

         }

         function f1() {

             var bb = "bb";

         }

         console.log(k); // haha

         console.log(aa); // undefined

         console.log(bb); // undefined

     </script>