javascript - 学习在 Javascript 中使用命名空间和模块

Question

所以，我在 jsfiddle 中有一个示例需要一些帮助。我有一个 html 表单，以及我想填充它的数据。我已将执行此操作的逻辑封装在 namespace 定义中，我认为这是正确的，但 JsHint 不认为它是正确的，是的，我的数据没有在表单控件中呈现。请帮助解决此问题，我将不胜感激。绝对不使用 Jquery，因为我仅使用 Ext.js 库。提前致谢。

[JSFiddle 链接到我的示例][1]

 var data = {
        Tasks = [{
            "taskid": 1,
                "author": "Bill Maher",
                "description": "Purple Rain purple",
                "dateCreated": "12/23/2013",
                "dataModified": "2/23/2013",
                "dueDate": "2/30/2014",
                "status": "in progress"
        }, {
            "taskid": 2,
                "author": "Seth Green",
                "description": "I am not certain this is needed",
                "dateCreated": "3/24/2011",
                "dataModified": "",
                "dueDate": "5/3/2011",
                "status": "completed"
        }, {
            "taskid": 3,
                "author": "Arnold Schwatsheneggar",
                "description": "I would of course like to have data to test with",
                "dataModified": "",
                "dueDate": "",
                "status": "in progress"
        }, {
            "taskid": 4,
                "author": "Lilly blue",
                "description": "make the sun shine high again",
                "dateCreated": "4/12/2014",
                "dataModified": "",
                "dueDate": "5/10/2014",
                "status": "started"
        }, {
            "taskid": 5,
                "author": "Sam Raj",
                "description": " when will I see you again",
                "dateCreated": "",
                "dataModified": "",
                "dueDate": "",
                "status": "in progress"
        }, {
            "taskid": 6,
                "author": "Kate Kurtmann",
                "description": "Show me that you love me. See ya!",
                "dateCreated": "",
                "dataModified": "",
                "dueDate": "",
                "status": "in progress"
        }, {
            "taskid": 7,
                "author": "Kristen BenBazza",
                "description": "I am a real American",
                "dateCreated": "3/4/2013",
                "dataModified": "12/3/14",
                "dueDate": "5/23/2014",
                "status": "in progress"
        }, {
            "taskid": 8,
                "author": "Venkat Shack",
                "description": "You are the bravest of hearts, you are the strongest of souls",
                "dateCreated": "12/1/2001",
                "dataModified": "12/12/2003",
                "dueDate": "7/6/2003",
                "status": "started"
        }, {
            "taskid": 9,
                "author": "Sunny Chan",
                "description": "WHat the f is FADs anyway",
                "dateCreated": "12/1/2011",
                "dataModified": "3/12/2013",
                "dueDate": "10/10/2014",
                "status": "completed"
        }, {
            "taskid": 10,
                "author": "William Rolloff",
                "description": "Accounting for the costs improving care",
                "dateCreated": "2/12/2013",
                "dataModified": "12/01/2014",
                "dueDate": "10/15/2015",
                "status": "completed"
        }, {
            "taskid": 11,
                "author": "Aakash Khandari",
                "description": "Making a move to a better life and career",
                "dateCreated": "4/3/2000",
                "dataModified": "4/7/2005",
                "dueDate": "7/17/2014",
                "status": "in progress"
        }

        ]
    };

// more code goes here but has been deleted for brevity

   //revealing public API
    return {
        exporter.tracy: {//namespace definition 
            data = data,
            trainingTask: {//second namespace
                add = addTask,
                update = UpdateTask,
                load = loadDetail,
                clearDetail = clearForm,
                save = SubmitTask,
                remove = deleteRecord,
                expandGroup = groupexpand,
                collapseGroup = groupcollapse,
                toggleGroup = toggleGroup,
                fillMenu = fillMenu,
                setGroupStyle = setGroupStyle,
                isGrouped = isGrouped
            };
        };
    };
};
/*ending of the module*/
}(this)); //close tracy.trainingtask

Answer 1

您正在闭包(自执行的匿名函数)内声明和定义 TaskSetJson，这对于模块化您的代码是正确的。

但是你忘了公开它。

您可以使用 RMP(揭示模块模式)，如下所示:

tracy = (function() {
  var foo = function(a,b,c) { ... };
  var var = function(e,f,g) { ... };
  var private_value = 1;
  var public_value = 2;
  // "Reveal" the public parts of your module
  return {
    foo: foo,
    var: var,
    public_value: public_value
  };
})();

使用这种模式，您的变量和函数是在闭包(匿名函数)内声明的。因此，它们只能在该封闭物内使用。但是您可以通过返回它们来使它们在闭包之外可用。

如果您想扩展保存 var 的现有全局变量，而不是返回模块的显示部分，您可以将其传递给自执行函数，然后直接附加到它:

(function(tracy) {
  var foo = function(a,b,c) { ... };
  var var = function(e,f,g) { ... };
  var private_value = 1;
  var public_value = 2;
  // "Reveal" the public parts of your module
  tracy = {
    foo: foo,
    var: var,
    public_value: public_value
  };
})();

这两个示例有点不同，但在这两种情况下，您都可以调用 tracy.foo、tracy.var 或访问 tracy.public_value.

第一个示例更加灵活，因为您可以获取模块的多个独立实例，并将它们存储在不同的变量中。