April 2020
Intermediate to advanced
177 pages
1h 45m
Chinese
Content preview from 精通模块化JavaScript
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1.4
模块化的粒度
｜
13
令其使用者很满意，但在需要时，它也能用于高级或不那么常见的用例，
这样做不会对易用性造成太大的不利影响，也不会大大提高实现的复杂性。
在接下来的几章中，我们将讨论如何在灵活性、简单性、可组合性和适当
的未来规划之间权衡。
1.4
模块化的粒度
我们可以在给定系统的每一层上应用模块化设计的概念。如果项目的需求
超出了其初始范围，可能应该考虑将该项目拆分为几个较小的项目，由小
团队来开发，这样更易于管理。应用程序也是如此 ：当它们变得庞大或复
杂到一定程度时，我们可能希望将它们拆分成不同的产品。
如果要使应用程序更易于维护，应该考虑创建显式定义的代码层，以便横
向拓展每个层，同时防止添加的那些内容中所含的复杂性蔓延到其他不相
关的层。对于单个组件也可以应用同样的思维 ：将它们分成两个或更多个
较小的组件，由另一个小组件连接起来，这个小组件可以充当组合层，其
唯一的职责就是将几个底层组件组合在一起。
在模块层面，应该努力使函数简洁、有表现力、命名具有描述性，而且功
能尽量少。比如我们有一个函数，专门用于在特定异步流下将一组任务组
合在一起，同时为该控制流中需要执行的每个任务提供其他功能。顶层的
流控制函数可以作为模块的公共接口方法暴露出来，但它唯一应该被视为
公共接口的部分，是我们接收的作为该函数输入的参数和由该顶层函数产
生的输出。其他的都变成了实现的细节，因此被认为是可替换的。
模块的内部函数不必像接口那么严格 ：只要公共接口保持不变，我们就可
14
｜
第
1
章
模块化思维
以按自己的需求任意改变实现，包括修改构成该实现的函数的接口。然而， ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.