April 2020
Intermediate to advanced
177 pages
1h 45m
Chinese
Content preview from 精通模块化JavaScript
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19
第 2 章
模块化原则
模块化可以解决复杂性问题，但我们所讨论的复杂性究竟是什么意思呢？
复杂性
（
complexity
）是一个含义丰富的术语，用于描述微妙的主题。
复杂
（
complex
）是什么意思？在字典里，复杂是指某物“由许多相互关联的部
分组成”，但这并不是我们在编程中谈到复杂性时所指的问题。一个程序可
能有成百上千个文件，但仍然被认为是相对简单的
1
。
下面这两个来自同一本字典的定义，可能在程序设计的背景下更具启发性 ：
y
“（复杂）表现为非常庞杂或需要仔细组装的部件、单元等。”
y
“头绪多且杂乱到难以理解或处理。”
第一个定义表明，当程序的各个部分以复杂的方式组织时，程序就会变得
复杂 ；各部分之间的相互联系就会成为一个痛点。其原因可能在于接口盘
根错节或缺少文档，而这正是我们在本书中要解决的复杂性问题的一个方
面。
1
字典中对
complex
定义的更多细节可能有助于阐明这个主题，请参见
dictionary
网站上关于
complex
的解释。
20
｜
第
2
章
模块化原则
我们可以把第二个定义解释成复杂性的另一面。组件可能非常复杂，以至
于很难理解、调试或扩展它们的实现。本书的大部分内容都在讲如何平衡
和避免这方面的复杂性。
从广义上讲，当某个东西难以掌握或难以完全理解时，它就是复杂的。根
据该定义，一个常规程序中的任何部分都可能是复杂的： ...
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