Backbone.LayoutManager.configure({
    fetch: function(path){
        return 'aaaa';
    },
    render: function(template, context) {
        return _.template(template)(context);
    },
});

// router.init
initialize: function(){
//  .....
    var layout = new Backbone.LayoutManager({
        name: 'layout',
        views: {
            navigation: new View_Navigation({model: self.user}),
        },
    });
    layout.render(function(el) {
        $("body").html(el);
    });