TodoMVC中的Backbone+marionetteJS+requireJS例子源码分析之一

浏览数：28 / 时间：2015年06月09日

Marionette牵线木偶，Backbone是脊骨的意思，Marionette是基于Backbone做扩展库，可以理解为把脊骨骨架绑线扯着变成牵线木偶动起来哈哈，使backbone更易使用呵呵！

构建或者扩展了很多新的东西，如：Application,Region,ItemView,CollectionView,CompositeView,LayoutView,AppRoute,Controller等等，把很多重复性的工作变成配置，程序入口引入了集中处理器Application，貌似Marionette的module不怎么好用，还不如用requireJS来得直观。

一、文件目录

比较清晰，bower_components里面存放jQuery,underscore等等依赖js库及js框架，不用管它；css文件也不用理它。

\index.html

<!doctype html>
<html lang="en" data-framework="marionettejs">
    <head>
        <meta charset="utf-8">
        <title>Backbone.Marionette & Requirejs • TodoMVC</title>
        <link rel="stylesheet" href="bower_components/todomvc-common/base.css">
        <link rel="stylesheet" href="css/custom.css">
    </head>
    <body>
        <section id="todoapp">
            <header id="header">
            </header>
            <section id="main">
            </section>
            <footer id="footer">
            </footer>
        </section>
        <footer id="info">
            <p>Double-click to edit a todo</p>
            <p>Created by <a href="http://github.com/jsoverson">Jarrod Overson</a></p>
        </footer>
        <script src="bower_components/todomvc-common/base.js"></script>
        <script data-main="js/main" src="bower_components/requirejs/require.js"></script><!--requireJS开始加载js/main.js文件-->
    </body>

js/main.js

require.config({//requireJS配置
    paths: {//路径配置
        underscore: ‘../bower_components/underscore/underscore‘,
        backbone: ‘../bower_components/backbone/backbone‘,
        marionette: ‘../bower_components/backbone.marionette/lib/backbone.marionette‘,
        jquery: ‘../bower_components/jquery/jquery‘,
        localStorage: ‘../bower_components/backbone.localStorage/backbone.localStorage‘,
        tpl: ‘lib/tpl‘
    },
    shim: {//非AMD规范库如backbone等库的配置,deps是依赖库
        underscore: {
            exports: ‘_‘
        },
        backbone: {
            exports: ‘Backbone‘,
            deps: [‘jquery‘, ‘underscore‘]
        },
        marionette: {
            exports: ‘Backbone.Marionette‘,
            deps: [‘backbone‘]
        }
    },
    deps: [‘jquery‘, ‘underscore‘]
});

require([
    ‘app‘,
    ‘backbone‘,
    ‘routers/index‘,
    ‘controllers/index‘
], function (app, Backbone, Router, Controller) {　　//requireJS标准写法
    ‘use strict‘;

    app.start();//应用启动－〉app.js

    new Router({ controller: Controller });//指定了Controller（controllers/index）的Marionette.AppRouter（routers/index）

    Backbone.history.start();//当你的所有路由创建并且设置完毕后，调用Backbone.history.start()来开始监控hashchange事件，并且分配路由
});

\app.js

/*global define */

define([
    ‘marionette‘,
    ‘collections/TodoList‘,
    ‘views/Header‘,
    ‘views/TodoListCompositeView‘,
    ‘views/Footer‘
], function (Marionette, TodoList, Header, TodoListCompositeView, Footer) {//requireJS标准写法，其实就是用function里的变量去代表相应的库/模块（注意：每个模块应该要有返回值,如app.js最后用了return window.app=app;）
    ‘use strict‘;

    var app = new Marionette.Application();
    //创建APP, Marionette官方描述为：the hub of your composite
//application. It organizes, initializes and coordinates the various pieces of your app.
    var todoList = new TodoList();//collections/TodoList,　collections就是model集

    var viewOptions = {
        collection: todoList
    };

    var header = new Header(viewOptions);
    var main = new TodoListCompositeView(viewOptions);
    var footer = new Footer(viewOptions);//这三个view都是绑定collections/TodoList这个collection

    app.addRegions({//给app增加region，region顾名思义是分区处理更加灵活
        header: ‘#header‘,
        main: ‘#main‘,
        footer: ‘#footer‘
    });

    app.addInitializer(function () {//添加事件到Marionette的初始器　app启动时会被马上执行
        //show 三个region
        app.header.show(header);
        app.main.show(main);
        app.footer.show(footer);

        todoList.fetch();//collection todoList获取localstorage的数据
    });

    app.listenTo(todoList, ‘all‘, function () {//监听collection todoList　所有事件包括todoList.fetch();
        app.main.$el.toggle(todoList.length > 0);//main view执行toggle 函数
        app.footer.$el.toggle(todoList.length > 0);//footer view执行toggle 函数
    });

    app.vent.on(‘todoList:filter‘, function (filter) {//vent是用于定义供实例外部引用的函数，可以看见在controller里面trigger此函数
        footer.updateFilterSelection(filter);//执行footer view里面的函数

        document.getElementById(‘todoapp‘).className = ‘filter-‘ + (filter === ‘‘ ? ‘all‘ : filter);//纯js
    });

    app.vent.on(‘todoList:clear:completed‘, function () {//vent是用于定义供实例外部引用的函数，可以看见在footer view里面trigger此函数
        todoList.getCompleted().forEach(function (todo) {
            todo.destroy();
        });
    });

    return window.app = app;//把app绑到window全局对象并返回
});