     this.set("propertyA", "propertyA");
                this.set("methodE", function() {
                    console.log("mothodE", this);
                });

                // mutil
                this.extend({
                    propertyA : "propertyAAAA", // override, you can override other default method.
                    propertyB : "propertyB",
                    methodD : function() {
                        console.log("methodD");
                    }
                });

                t