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我这么写自定义为什么报myjsonp is not defined的错

var app=angular.module('app',[]);
app.factory('myjsonp',function(){
    myjsonp.change=function(name){
        var result=[];
        $http.jsonp('https://sp0.baidu.com/5a1Fazu8AA54nxGko9WTAnF6hhy/su?wd='+name+'&cb=JSON_CALLBACK').success(
                function(data){
                    result=data.s;
                }
        ).error(
                function(data){
                    alert(data.msg);
                }
        );
        return result;
    };
});
app.controller('aaa',['$scope','myjsonp',function($scope,myjsonp){
    $scope.data=myjsonp.change();

}]);