The difference between import and dependjs in js

import and dependjs are both syntaxes for loading external modules in JavaScript. import is supported in all modern browsers, follows the ECMAScript module specification, loads modules statically, imports into the current scope, and generally performs better than dependjs. dependjs is only supported in Node.js, follows the CommonJS module specification, dynamically loads modules, and imports them into the global scope, which is more suitable for situations where a large number of modules need to be loaded at runtime.

The difference between import and dependjs in JavaScript

Get straight to the point:

import and dependjs are both syntaxes in JavaScript for loading external modules, but there are some key differences between them.

Detailed explanation:

• Syntax:

  • import: use import { module_name } from 'module_path'; Syntax.
  • dependjs: Use var module_name = require('module_path'); syntax.

• Support:

  • import: Supported in all modern browsers.
  • dependjs: Only supported in Node.js.

• Module loading:

  • import: Follows the ECMAScript module specification, where modules are loaded statically.
  • dependjs: Follows the CommonJS module specification, where modules are loaded dynamically. This enables dependjs to load modules at runtime, which is very useful in Node.js.

• Scope:

  • import: The module is imported into the current scope, which means the module can be accessed immediately variables and functions.
  • dependjs: Modules are imported into the global scope, which means that the module_name. prefix must be used to access the module's variables and functions.

• Performance:

  • import: usually performs better than dependjs due to its static loading characteristics.
  • dependjs: In some cases, dynamic loading may be more suitable, such as when a large number of modules need to be loaded at runtime.

Example:

import:

import { math } from 'mathjs';

console.log(math.add(2, 3)); // 输出：5

dependjs:

var math = require('mathjs');

console.log(math.add(2, 3)); // 输出：5

In summary, both import and dependjs are used to load external modules, but they differ in syntax, support, module loading, scope and performance. import is more suitable for use in the browser, while dependjs is more suitable for use in Node.js.

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