JavaScript Backbone.js framework environment construction and Hello world example

JavaScript Backbone.js framework environment construction and Hello world example_Basic knowledge

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Release： 2016-05-16 15:01:37

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Environment preparation
Before learning Backbone formally, you need to prepare some things:
First, you need to get the Backbone framework source files: http://documentcloud.github.com/backbone/
Backbone relies on the basic methods of the Underscore framework, so you also need to download the source files of the Underscore framework: http://documentcloud.github.com/underscore/
In Backbone, operations on DOM and events rely on third-party libraries (such as jQuery or Zepto). You only need to choose one to download:
jQuery: http://jquery.com/
Zepto: http://zeptojs.com/
It seems quite troublesome, but the purpose of Backbone is to use a simple framework to build complex applications, so trouble does not mean that it is complicated.
You can create a new HTML page and introduce these frames, like this:

<script type="text/javascript" src="jquery/jquery-1.8.2.min.js"></script> 
<script type="text/javascript" src="underscore/underscore-min.js"></script> 
<script type="text/javascript" src="backbone/backbone-min.js"></script>

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At this point, you have prepared the environment necessary to run Backbone.

Hellow World
Let’s first talk about the functions of this helloworld: There is a report button on the page. Click the pop-up input box, enter the content, confirm, and finally the content will be added to the page. The page picture is as follows:

201657111923472.jpg (1366×768)

Look at the code below:

<!DOCTYPE html>
<html>
<head>
    <title>the5fire.com-backbone.js-Hello World</title>
</head>
<body>
<button id="check">报到</button>
<ul id="world-list">
</ul>
<a href="http://www.the5fire.com">更多教程</a>
</body>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>
<script src="http://documentcloud.github.com/underscore/underscore-min.js"></script>
<script src="http://documentcloud.github.com/backbone/backbone-min.js"></script>
<script>
(function ($) {
    World = Backbone.Model.extend({
        //创建一个World的对象，拥有name属性
        name: null
    });

    Worlds = Backbone.Collection.extend({
        //World对象的集合
        initialize: function (models, options) {
            this.bind("add", options.view.addOneWorld);
        }
    });

    AppView = Backbone.View.extend({
        el: $("body"),
        initialize: function () {
            //构造函数，实例化一个World集合类，并且以字典方式传入AppView的对象
            this.worlds = new Worlds(null, { view : this })
        },
        events: {
            "click #check": "checkIn",  //事件绑定，绑定Dom中id为check的元素
        },
        checkIn: function () {
            var world_name = prompt("请问，您是哪星人&#63;");
            if(world_name == "") world_name = '未知';
            var world = new World({ name: world_name });
            this.worlds.add(world);
        },
        addOneWorld: function(model) {
            $("#world-list").append("<li>这里是来自 <b>" + model.get('name') + "</b> 星球的问候：hello world！</li>");
        }
    });
    //实例化AppView
    var appview = new AppView;
})(jQuery);
</script>
</html>

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I think the code is intuitive. It involves the three parts of backbone, view, model, and collection, which will be mentioned later. As long as you understand here, model represents a data model, collection is a collection of models, and view It is used to process pages and simple page logic.