RequireJS、循环依赖和导出“魔术”方法

Question

我一直在尝试按照James Burke's answer 到this question 的建议使用the special 'exports' magic module 设置RequireJS 来处理循环依赖项。

按照@jrburke 在该问题中给出的示例：

define("Employee", ["exports", "Company"], function(Company) {
    function Employee(name) {
        this.name = name;
        this.company = new Company.Company(name + "'s own company");
    };
    exports.Employee = Employee;
});
define("Company", ["exports", "Employee"], function(Employee) {
    function Company(name) {
        this.name = name;
        this.employees = [];
    };
    Company.prototype.addEmployee = function(name) {
        var employee = new Employee.Employee(name);
        this.employees.push(employee);
        employee.company = this;
    };
    exports.Company = Company;
});

jsfiddle

问题是用他自己的例子，exports 模块是未定义的，因此exports.Employee 和exports.Company 不设置。如果我尝试将导出作为定义回调函数的参数包含在内，它只会在两种情况下都初始化为空，并且不携带分配给它的构造函数。

我做错了什么？

编辑：通过反复试验，我得到了上面的代码：http://jsfiddle.net/jpk45vow/4/。谁能解释为什么它有效，因为它对我来说毫无意义。

Answer 1

编辑：我找不到有关魔法导出方法的更多信息。然而，我可以用一个虚拟的“容器”模块来模仿它的预期行为。在这个小提琴中看到它：http://jsfiddle.net/amenadiel/a7thxz98/

console.log("start");

define("Container",function() {
    var Container={};
    return Container;
});


define("Employee", ["Container"], function(Container) {
    var Employee= function(name) {
        this.name = name;
        this.company = new Container.Company(name + "'s own company");
    };
    Container.Employee = Employee;
});

define("Company", ["Container"], function(Container) {
    var Company=function(name) {
        this.name = name;
        this.employees = [];
    };
    Company.prototype.addEmployee = function(name) {
        var employee = new Container.Employee(name);
        this.employees.push(employee);
        employee.company = this;
    };
    Container.Company = Company;
});

define("main", ["Container","Employee","Company" ], function ( Container) {
    var john = new Container.Employee("John");
    var bigCorp = new Container.Company("Big Corp");
    bigCorp.addEmployee("Mary");
    console.log(bigCorp);
});

require(["main"]);