javascript - 如何从子模块访问父方法？

Question

我有以下模块/类和子模块设置

MyAPI.js

class MyAPI {
  construction(){
    this.food = require('./Food');
  }
}
module.exports = MyAPI;

Food.js

class Food {
  constructor(){
    ...
  }
}
module.exports = Food;

app.js

var api = require('./MyAPI');
var taco = new api.food;
var cheeseburger = new api.food;

我想知道，是否可以在 Food.js 中调用 MyAPI 属性和函数形式？我需要以某种方式将 this 传递到 require 中吗？

this.food = require('./Food')(this); // this didn't work...

以上结果是这样的:

TypeError: Class constructors cannot be invoked without 'new'

但是为什么我要在 MyAPI 构造函数中使用 new ？

创建子类和子模块并从中创建新对象的最佳方法是什么？

Answer 1

我认为您混淆了类和实例:

var MyAPI = require('./MyAPI');//this is a class
var apiInstance = new MyAPI();//the creates a new instance of your class
var taco = new apiInstance.food //the food property on your api is a class not an instance
var tacoInstance = new taco();