如何扩展使用原型的 javascript 模块

Question

在我的项目中有一个模块是在特定的 JS 文件中实现的，如下例

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;
});

现在在不同的JS文件（新模块）中我想扩展addEmployee方法，例如我想向其中添加地址数据，可以吗？？？如果是的话我应该怎么做？例子会很有帮助！

提前致谢！

Answer 1

如果您只想为一个实例更改此方法，您可以做的是在您的模块中创建一个新的 Company 实例，通过添加以下代码覆盖实例上的 addEmployee 方法你自己的，然后从原型调用原始方法：

// create a new instance of Company
var myCompany = new Company('myCompany');
// add method 'addEmployee' to your instance, it will override original method
// you can, of course, add more arguments if you wish
myCompany.addEmployee = function(name) {
    // your code here
    // and than call the original method settings it's 'this' to 'this' of your instance, 
    // and providing appropriate arguments
    Company.prototype.addEmployee.call(this, name);
}

Answer 2

这样的东西行得通吗？

//required as Company
(function(){
  var addEmployee = Company.prototype.addEmployee;
  Company.prototype.addEmployee = function(name, address){
    //assuming the original addEmployee returns the created instance
    var emp = addEmployee.call(this,name);
    //do something with address
    emp.address=address;
    return emp;//also return the created employee so it'll behave the same as the original
  }
}())

如何扩展使用原型的 javascript 模块

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