无法访问所有Javascript对象属性

Question

我对JS对象构造函数相当新，我似乎在这里遇到了问题  我如何构建对象，范围或两者。 myService方法确实创建了两个新的  属性，响应和状态，但是当我尝试访问这些属性时  ＆＃34;未定义＆＃34;我不确定为什么。

var n = new myPlaces(map, myOptions);
var z = n.places();
console.log(z);   // returns object with all properites
console.log(z.response) //undefined  
console.log(z.status) // undefined


function myPlaces(map, myOptions) {     
        this.map = map;
        this.myOptions = myOptions; 
        };  

    myPlaces.prototype = {
            construtor: myPlaces,
            myService: function() {
                var self = this;
                this.service = new google.maps.places.PlacesService(this.map);
                this.service.nearbySearch(this.myOptions.request, function(results, status) {
                    self.response = results;  //response: Array[20]
                    self.status = status;     //status: "OK"
                        });
                return self;
            },
            places:function() {
                return this.myService();    
        }   
        };