June 2021
Intermediate to advanced
290 pages
9h 21m
Chinese
Content preview from Node与Express开发（第2版）
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request
和
response
对象
｜
59
6.9
深入源代码
由于
JavaScript
是一种原型继承的语言，要完全理解正在使用的对象有时候是一个挑战。
Node
提供的对象会经过
Express
的扩展
，而你增加的包也会扩展那些对象。想要清楚地知
道对象有什么属性和方法可用有时候并不容易。通常我推荐反向操作：如果要寻找某个功
能，首先检查
Express API
文
档。
Express API
文档相当完整，很多时候我们能从里面找到
所需。
如果文档里没有想要的信息，有时候就得深入
Express
源代码
。我十分鼓励你深入源代码，
因为你很可能会发现，读源代码远没有想象的那般令人头疼。下面是一个快速导航，据此
可以从
Express
源代码里查找想要的东西。
lib/application.js
这是
Express
的主要接口
。如果想理解中间件是怎么链接起来的或视图是怎么渲染的，
就需要读这个文件。
lib/express.js
一个相对短小的文件，主要提供了
createApplication
函数（这个文件的默认导出），这
个函数用于创建
Express
应用的一个实例。
lib/request.js
扩展
Node
的
http.IncomingMessage
对象，从而提供一个健壮的
request
对象。这个文件
包含
request
对象所有的属性和方法。
lib/response.js
扩展
Node
的
http.ServerResponse
对象，从而提供
response
对象。这个文件包含
response
对象的属性和方法。
lib/router/route.js ...
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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.