Question

我一直在使用Revealing Module模式并拥有多个名称空间。例如：

// here's the namespace setup

var myProject= myProject|| {};
var myProject.models= myProject.models || {};

myProject.models.MyModel= function(){
   var someMethod = function(){
     // do something
   };
   return{
      SomeMethod = someMethod
   };
}

我正在转移到Revealing Prototype Pattern以获得一些内存使用改进，因此我可以为对象修饰另一个函数。如何将其保存在myProject.models命名空间中？这给出了我的JavaScript错误：

var myProject.models.MyModel= function(){
   // properties here
};

myProject.models.MyModel.prototype = (function(){
   // methods here
    var someMethod = function(){
         // do something
    };
    return{
       SomeMethod = someMethod
    };
}());

Answer 1

您有各种语法错误。

myProject = window.myProject|| {};

myProject.models = myProject.models || {};

myProject.models.MyModel = (function () {
   //declare a constructor function
   function MyModel() {
   }

   //declare a function that will be publicly available on each MyModel instances
   MyModel.prototype.someFunction = function () {
       //call the private function from within the public one
       //note: you have to be careful here since the context object (this) will be
       //window inside somePrivateFunction
       somePrivateFunction();

       //call the private function and set the context object to the current model instance
       //somePrivateFunction.call(this);           
   };

   //declare a private function
   function somePrivateFunction() {
   }

   return MyModel; //return the model constructor
})();

现在您可以使用您的模型：

var m = new myProject.models.MyModel();
m.someFunction();

Answer 2

var myProject = myProject || {};
^^^

您在此处使用var statement来声明全局myProject变量（如果尚未声明），以便它不会抛出Undefined variable个异常。（如果它现在具有值，则将其初始化为空对象）

var myProject.models= myProject.models || {};

在这里，您要从上面为对象分配models属性。 var关键字在这里不合适;删除它，它会工作。

使用myProject.models.MyModel = …，您在上方代码段中执行了正确的操作，而在第二个代码段中执行错误;我不确定你试图使用哪个。揭示原型模式应如下所示：

var myProject = myProject || {};
myProject.models = myProject.models || {};
myProject.models.MyModel = (function(){
    function MyModel() {
        // instance properties here
    }
    function someMethod(){
        // do something
    }
    MyModel.prototype.SomeMethod = someMethod;
    //                ^ lowercase that?
    return MyModel;
})();

如何在Revealing Prototype Pattern中命名对象？

2 个答案: