Angularjs $Resource GET请求

$scope.listdevices=function(){
        var devices = $resource('http://localhost:8080/userapi/devices/:userId',{userId:'@userId'});
        var list=devices.query({userId:$scope.userId});
        console.log(JSON.stringify(list));
        console.log(list);
        console.log(list.length+"TAMANHO")
};