April 2020
Intermediate to advanced
177 pages
1h 45m
Chinese
Content preview from 精通模块化JavaScript
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47
第 3 章
模块设计
多站在
API
驱动设计和文档驱动设计的角度进行思考，就能写出更多具有
可用性的模块。你可能会说内部构造没那么重要，“只要接口能承受，可以
把任何想要的东西混在一起！”然而，有一个可用的接口只是问题的一个
方面，它对保持应用程序的可维护性几乎没有什么用。设计合理的模块内
部结构有助于保持代码的可读性和意图的清晰性。本章将讨论在编写具有
可扩展性却不超出当前需求范围太多的模块时需要考虑些什么问题。我们
将更深入地讨论
CRUST
原则，最后还会阐述当模块随着时间的推移变得
越来越臃肿且复杂时该如何进行修剪。
3.1
构建模块
要实现整洁的（
clean
）模块设计，关键在于要实现一组小且作用唯一的函数。
为唯一用途而编写的函数，即使其所属的模块增长到
500
行代码，仍然具
有良好的可扩展性，因为它们在所属模块中并未引入多少组织结构上的复
杂性。小函数发挥的作用不一定逊于大函数，而且前者在进行组合时更有
优势。
48
｜
第
3
章
模块设计
假设我们不是用
100
行代码实现一个函数，而是将其分解为
3
个或更多更
小的函数，那么日后或许可以在模块的其他地方重用这些小函数，这些函
数还可能成为其公共接口的有效补充。
本章的目的是，讨论如果要在模块级别降低复杂性，在设计代码时需要考
虑哪些因素。虽然本章将要讨论的大部分内容与我们编写函数的方式有关， ...
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