Backbone.history.navigate("page", {trigger: true});

routes: {
                "page": "page",
    },

initialize: function () {
            this.currentView = undefined;
            var page;
            page = new Login();
            this.changePage(page);
            },

page: function () {
        var myview = new View({});
        this.changePage(myview );
    },

changePage: function (page) {
        if(this.currentView) {
            this.currentView.remove();
            this.currentView.off();
            }
        this.currentView = page;
        page.render();
    }