var vm=(function(){

  var name="jasper";

  var changename=function(v){

   name=v;

  };

  return {

    name:name,

    changename:changename

  };

})();

vm.changename("sean");

alert(vm.name);

var vm=(function(){

  var person={name:"jasper"};

  var changename=function(v){

   person.name=v;

  };

  return {

    person:person,

    changename:changename

  };

})();

vm.changename("sean");

alert(vm.person.name);

 var vm = (function () {

            var person = { name: "jasper" };

            var changename = function (v) {

                //person.name = v;

                person = { };

            };

            return {

                person: person,

                changename: changename

            };

        })();

        vm.changename("sean");

        alert(vm.person.name);