September 2022
Intermediate to advanced
585 pages
8h 17m
Chinese
Content preview from JavaScript 经典实例：第三版
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480
｜
第
18
章
const
ciao = val => {
return
console.log(`Ciao ${val}`);
};
module.exports = { hello, ciao };
然后，直接访问对象属性。
const
greeting = require('./lib/greeting.js')
//
输出“
Hello world
”
greeting.hello('world');
//
输出“
Ciao mondo
”
greeting.ciao('mondo');
由于这个模块不是通过
npm
安装的，就存放在应用目录中，因此要通过文件位置和
名称访问，不能只指定名称。
18.2.4
参考
18.3
节介绍如何确保库代码在
CommonJS
和
ECMAScript
两个模块环境中都可以使
用。
18.4
节介绍如何创建独立的模块。
18.3
让代码支持多个模块环境
18.3.1
问题
你想把自己编写的库分享给他人使用，但是每人使用的
Node
版本不同，有的用
CommonJS
模块，有的用
ECMAScript
模块。怎样确保你的库可以在所有环境中使
用呢？
18.3.2
方案
使用
ECMAScript
模块包装
CommonJS
模块。
Node
模块
｜
481
首先，以
CommonJS
模块格式编写库，保存时使用
.cjs
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