April 2020
Intermediate to advanced
177 pages
1h 45m
Chinese
Content preview from 精通模块化JavaScript
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8
｜
第
1
章
模块化思维
用这些函数的方法，使
RequireJS
的使用变得更加复杂。
API
并不是最直观
的，因为有很多方法可以做这件事情——用依赖项来声明模块。
AngularJS
的依赖注入（
dependency injection
）系统也有许多同样的问题。
它在当时是一种优雅的解决方案，依靠巧妙的字符串解析来避免依赖数组，
并改用函数参数名来解决依赖关系。这种机制与代码压缩工具（
minifier
）
不兼容，代码压缩工具会将参数重命名为单个字符而破坏依赖注入机制。
后来，
AngularJS v1
版本引入了一个构建任务，将如下代码 ：
module.factory('calculator', function(mathlib) {
// ...
})
转换为下面的格式，因为它加入了明确的依赖项列表，所以可以放心地压缩：
module.factory('calculator', ['mathlib', function(mathlib) {
// ...
}])
因为
AngularJS
引入这个鲜为人知的构建工具的时机太晚，而且它需要额
外的构建步骤来恢复不该被破坏的东西，有过度设计之嫌，而带来的好处
小到可以忽略不计，这些因素都阻碍了该模式的使用。因此，开发者大多
会坚持用他们熟悉的类似
RequireJS
那种写死依赖关系的数组格式。
1.2.3
Node.js
和
CommonJS
的出现
谈到
Node.js
衍生的若干创新，
CommonJS
模块系统算得上一个，它被简称为
CJS
。由于利用了
Node.js
程序访问文件系统的能力，因此 ...
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