Comments (1)
两者的加载方式不同、规范不同
第一、两者的加载方式不同,require 是在运行时加载,而 import 是在编译时加载
require('./a')(); // a 模块是一个函数,立即执行 a 模块函数
var data = require('./a').data; // a 模块导出的是一个对象
var a = require('./a')[0]; // a 模块导出的是一个数组 ======> 哪都行
import $ from 'jquery';
import * as _ from '_';
import {a,b,c} from './a';
import {default as alias, a as a_a, b, c} from './a'; ======>用在开头
第二、规范不同,require 是 CommonJS/AMD 规范,import 是 ESMAScript6+规范
第三、require 特点:社区方案,提供了服务器/浏览器的模块加载方案。非语言层面的标准。只能在运行时确定模块的依赖关系及输入/输出的变量,无法进行静态优化。
import 特点:语言规格层面支持模块功能。支持编译时静态分析,便于 JS 引入宏和类型检验。动态绑定。
from day-interview.
Related Issues (20)
- 【html】meta标签的定义和作用? HOT 1
- 【js】Symbol是什么,有什么作用? HOT 1
- 【js】Reflect是什么,有什么作用? HOT 1
- 【js】Class、extends是什么,有什么作用? HOT 1
- 【js】Object.is() 与原来的比较操作符 ===、== 的区别? HOT 1
- 【react】传入 setState 函数的第二个参数的作用是什么? HOT 1
- 【js】JavaScript 的组成 HOT 1
- 【js】JS 的基本数据类型和引用数据类型 HOT 1
- 【js】检测浏览器版本版本有哪些方式? HOT 1
- 【js】介绍 JS 有哪些内置对象? HOT 1
- 【js】介绍 JavaScript 的原型,原型链?有什么特点? HOT 1
- 【js】什么是 Window 对象? 什么是 Document 对象? HOT 1
- 【js】事件的三个阶段 HOT 1
- 【js】IE 的事件处理和 W3C 的事件处理有哪些区别? HOT 1
- 【其他】web 开发中会话跟踪的方法有哪些 HOT 1
- 【其他】为什么要有同源限制? HOT 1
- 【js】简单实现 Function.bind 函数? HOT 1
- 【其他】PNG,GIF,JPG 的区别及如何选 HOT 1
- 【其他】HTTP method HOT 1
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from day-interview.