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渐进式Express学习课程,从零开始实现一个Express

JavaScript 100.00%

grow-to-express's Introduction

渐进式Express源码学习| 小白也能懂源码

这个系列教程的目的是用一种渐进式的方式,帮助Node/Javascript工程师更快更容易得理解Express工作机制。 所谓的渐进式,就是从最简单的web服务器,一步一步添枝加叶,最后形成一个完整Express的过程。

缘起

接触Express已有两年多时间,也面试了很多Node工程师。我发现很多工程师会用Express,但是不知道Express如何工作,稍微深入一点的面试问题就答不上来,例如:

  • 严格路由和不严格路由有什么区别
  • 如何设置路由不敏感或严格路由
  • 什么是lazy router以及为什么要lazy router
  • trust proxy什么用
  • Etag weak 和strong有什么区别
  • app.all和app.use的区别及性能差异
  • 如何捕捉next(err)传递的错误
  • 路由function内部的错误是在哪个环节捕捉的

说到底,是知其然,不知其所以然。而读源码,是解决这个问题的最好方法。 但是大家普遍面临一个源码阅读时间成本高的问题。而我想做的,是通过一种创新的方式,讲解Express工作原理和实现。

如何讲解

我会从最基础的http模块开始,一步一步得实现一个Express。这样做的好处

  1. 从最简单的出发,基础小白也能看懂
  2. 循序渐进,不会迷失在复杂的代码中
  3. 非常清晰得知道每一段代码添加的缘由

文章组织

会分成系列文章讲解,每个文章都基于上一个文章实现一个加强版的Web框架。每个文章会给出框架源码、框架说明,框架使用样例。话不多少,开始第一个Web框架的实现吧!

文章目录

  1. 渐进式Express源码学习1.万物归宗
  2. 渐进式Express源码学习2.道士下山
  3. 渐进式Express源码学习3.初露锋芒
  4. 渐进式Express源码学习4.如虎添翼
  5. 渐进式Express源码学习5.全副武装
  6. 渐进式Express源码学习6.独孤求败

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