Node.js 默认使用CJS(CommonJS)规范 (即 require 和 module.exports)

而不是ESM(ES Modules)规范 (即 import 和 export)

ESM规范
	方式1 - 配置package.json
	demo.js
		//从 web.js 文件中导入 title、url、getUrl
		import obj from "./web.js"

		console.log(obj.title)
		console.log(obj.url)
		console.log(obj.getUrl())

	web.js
		let title = "邓瑞编程"
		let url = "dengruicode.com"

		let getUrl = () => "www.dengruicode.com"

		//将一个对象作为整体导出, 导出的对象包含 title、url、getUrl
		export default { title, url, getUrl }

	package.json
		{
		  "type": "module",
		  "name": "demo",
		  "version": "1.0.0",
		  "main": "demo.js",
		  "scripts": {
		    "test": "echo \"Error: no test specified\" && exit 1"
		  },
		  "author": "",
		  "license": "ISC",
		  "description": ""
		}

	方式2 - mjs
	demo.mjs
		//从 web.js 文件中导入 title、url、getUrl
		import obj from "./web.mjs"

		console.log(obj.title)
		console.log(obj.url)
		console.log(obj.getUrl())

	web.mjs
		let title = "邓瑞编程"
		let url = "dengruicode.com"

		let getUrl = () => "www.dengruicode.com"

		//将一个对象作为整体导出, 导出的对象包含 title、url、getUrl
		export default { title, url, getUrl }


CJS规范
	demo.js
		//从 web.js 文件中导入 title、url、getUrl
		//import obj from "./web.js" //ESM规范
		const obj = require("./web.js") //CJS规范

		console.log(obj.title)
		console.log(obj.url)
		console.log(obj.getUrl())

	web.js
		let title = "邓瑞编程"
		let url = "dengruicode.com"

		let getUrl = () => "www.dengruicode.com"

		//将一个对象作为整体导出, 导出的对象包含 title、url、getUrl
		//export default { title, url, getUrl } //ESM规范
		module.exports = { title, url, getUrl } //CJS规范


注
	Node.js 新项目建议使用ESM规范