Question

我努力學習的Node.js（ES6），但未能對require

這是我的結構：

baseModel。 JS

"use strict"; 

class BaseModel { 
    constructor(options = {}, data = []) { // class constructor 
     this.name = 'Base' 
     this.url = 'http://azat.co/api' 
     this.data = data 
     this.options = options 
    } 

    getName() { // class method 
     console.log(`Class name: ${this.name}`) 
    } 
} 

AccountModel.js個

"use strict"; 

require('./baseModel.js'); 

class AccountModel extends BaseModel { 
    constructor(options, data) { 

    super({private: true}, ['32113123123', '524214691']) //call the parent method with super 
     this.name += 'Account Model' 
     this.url +='/accounts/' 
    } 


    get accountsData() { //calculated attribute getter 
    // ... make XHR 
     return this.data 
    } 

} 

main.js

"use strict"; 

require('./AccountModel.js'); 

let accounts = new AccountModel(5) 

accounts.getName() 

console.log('Data is %s', accounts.accountsData); 

我現在運行：node --harmony-default-parameters main.js

，並得到錯誤：

ReferenceError: BaseModel is not defined at Object. (/Users/tamirscherzer/POC/projects/NodeJS/tutorials/classes/AccountModel.js:5:28) at Module._compile (module.js:397:26) at Object.Module._extensions..js (module.js:404:10) at Module.load (module.js:343:32) at Function.Module._load (module.js:300:12) at Module.require (module.js:353:17) at require (internal/module.js:12:17) at Object. (/Users/tamirscherzer/POC/projects/NodeJS/tutorials/classes/main.js:5:1) at Module._compile (module.js:397:26) at Object.Module._extensions..js (module.js:404:10)

真是奇怪了，如果我改變require('./baseModel.js');以其他名稱，我得到錯誤的文件n沒有發現這樣的路徑寫得很好。

還定義權限777 - 同樣的事情，BaseModel is not defined

什麼想法？

Answer 1

當您在Node中定義一個變量時，它不會像在瀏覽器中那樣添加到全局範圍內 - 它對於該文件/模塊是本地的。因此，您不能簡單地導入文件，並期望其中定義的內容可用 - 您明確地必須導出並導入它們。

BaseModel.js：

class BaseModel { 
    constructor(options = {}, data = []) { // class constructor 
     this.name = 'Base' 
     this.url = 'http://azat.co/api' 
     this.data = data 
     this.options = options 
    } 

    getName() { // class method 
     console.log(`Class name: ${this.name}`) 
    } 
} 

module.exports = BaseModel; 

AccountModel.js：

"use strict"; 

let BaseModel = require('./baseModel.js'); 

class AccountModel extends BaseModel { 
    constructor(options, data) { 

    super({private: true}, ['32113123123', '524214691']) //call the parent method with super 
     this.name += 'Account Model' 
     this.url +='/accounts/' 
    } 


    get accountsData() { //calculated attribute getter 
    // ... make XHR 
     return this.data 
    } 

} 

module.exports = AccountModel; 

main.js：

"use strict"; 

let AccountModel = require('./AccountModel.js'); 

let accounts = new AccountModel(5) 

accounts.getName() 

console.log('Data is %s', accounts.accountsData);