-
Notifications
You must be signed in to change notification settings - Fork 0
/
2016-05-12.html
307 lines (200 loc) · 20.9 KB
/
2016-05-12.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="baidu-site-verification" content="code-eNJWzxzd8J" />
<meta name="google-site-verification" content="M18XdAWwaOCGMRZTwx7Bjq4w7IeciCJxhsH3LZv8jtg" />
<!-- Global site tag (gtag.js) - Google Analytics -->
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-69718833-3"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'UA-69718833-3');
</script>
<!-- End Google Analytics -->
<title>nodejs 学习(一) | janceChun</title>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="description" content="node模块实现">
<meta property="og:type" content="article">
<meta property="og:title" content="nodejs 学习(一)">
<meta property="og:url" content="https://jancechun.github.io/2016-05-12.html">
<meta property="og:site_name" content="janceChun">
<meta property="og:description" content="node模块实现">
<meta property="og:locale" content="en_US">
<meta property="article:published_time" content="2016-05-11T16:00:00.000Z">
<meta property="article:modified_time" content="2022-07-29T08:53:05.312Z">
<meta property="article:author" content="janceChun">
<meta property="article:tag" content="nodejs">
<meta name="twitter:card" content="summary">
<link rel="shortcut icon" href="/favicon.png">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/typeface-source-code-pro@0.0.71/index.min.css">
<link rel="stylesheet" href="/css/style.css">
<link rel="stylesheet" href="/fancybox/jquery.fancybox.min.css">
<meta name="generator" content="Hexo 6.2.0"></head>
<body>
<div id="container">
<div id="wrap">
<header id="header">
<div id="banner"></div>
<div id="header-outer" class="outer">
<!-- <div id="header-title" class="inner">
<h1 id="logo-wrap">
<a href="/" id="logo">janceChun</a>
</h1>
</div> -->
<div id="header-inner" class="inner">
<nav id="main-nav">
<a id="main-nav-toggle" class="nav-icon"></a>
<a class="main-nav-link" href="/">
Home
</a>
<a class="main-nav-link" href="/archives">
Archives
</a>
</nav>
<nav id="sub-nav">
<a id="nav-github" class="nav-icon" target="_blank" rel="noopener" href="https://github.com/janceChun" title="github"></a>
<a id="nav-search-btn" class="nav-icon" title="Search"></a>
</nav>
<div id="search-form-wrap">
<form action="//google.com/search" method="get" accept-charset="UTF-8" class="search-form"><input type="search" name="q" class="search-form-input" placeholder="Search"><button type="submit" class="search-form-submit"></button><input type="hidden" name="sitesearch" value="https://jancechun.github.io"></form>
</div>
</div>
</div>
</header>
<div class="outer">
<section id="main">
<article id="post-2016-05-12" class="h-entry article article-type-post" itemprop="blogPost" itemscope itemtype="https://schema.org/BlogPosting">
<!-- <div class="article-meta">
<a href="/2016-05-12.html" class="article-date">
<time class="dt-published" datetime="2016-05-11T16:00:00.000Z" itemprop="datePublished">2016-05-12</time>
</a>
<div class="article-category">
<a class="article-category-link" href="/categories/nodejs/">nodejs</a>
</div>
</div> -->
<div class="article-inner">
<header class="article-header">
<h1 class="p-name article-title" itemprop="headline name">
nodejs 学习(一)
</h1>
</header>
<div class="e-content article-entry" itemprop="articleBody">
<h1 id="node-模块实现"><a href="#node-模块实现" class="headerlink" title="node 模块实现"></a>node 模块实现</h1><h2 id="优先从缓存加载"><a href="#优先从缓存加载" class="headerlink" title="优先从缓存加载"></a>优先从缓存加载</h2><h2 id="路径分析和文件定位"><a href="#路径分析和文件定位" class="headerlink" title="路径分析和文件定位"></a>路径分析和文件定位</h2><h3 id="模块标识符分析"><a href="#模块标识符分析" class="headerlink" title="模块标识符分析"></a>模块标识符分析</h3><h4 id="核心模块"><a href="#核心模块" class="headerlink" title="核心模块"></a>核心模块</h4><p>http,fs,path<br> 核心模块其实分为 C/C++编写的和 JavaScript 编写的两部分，其中 C/C++文件存放在 Node 项目的 src 目录下，JavaScript 文件存放在 lib 目录下。<br> 内建模块(由纯 C/C++编写的部分)，因为它们通常不被用户直接调用<br> Node 的 buffer、crypto、evals、fs、os 等模块都是部分通过 C/C++编写的</p>
<span id="more"></span>
<h4 id="路径形式的文件模块"><a href="#路径形式的文件模块" class="headerlink" title="路径形式的文件模块"></a>路径形式的文件模块</h4><p>模块路径(沿路径向上逐级递归,直到根目录下的 node_modules)</p>
<h4 id="自定义模块"><a href="#自定义模块" class="headerlink" title="自定义模块"></a>自定义模块</h4><p>可能是一个文件或者包的形式</p>
<h3 id="文件定位"><a href="#文件定位" class="headerlink" title="文件定位"></a>文件定位</h3><h4 id="文件扩展名分析"><a href="#文件扩展名分析" class="headerlink" title="文件扩展名分析"></a>文件扩展名分析</h4><p>node 会按.js .node .json 的次序补足扩展名<br> 如果是.node 和.json 文件，在传递给 require()的标识符中带上扩展名，会加快一点速度<br> 同步配合缓存，可以大幅度缓解 Node 单线程中阻塞式调用的缺陷</p>
<h4 id="目录分析和包"><a href="#目录分析和包" class="headerlink" title="目录分析和包"></a>目录分析和包</h4><p>node 在前目录下查找 package.json->index.js->index.node->index.json</p>
<h2 id="模块编译"><a href="#模块编译" class="headerlink" title="模块编译"></a>模块编译</h2><ul>
<li>js文件 (通过fs模块同步读取文件后编译执行)</li>
<li>node文件 (用c/c++编写的扩展文件,通过dlopen()方法加载最后编译生成的文件)</li>
<li>json文件。通过fs模块同步读取文件后，用JSON.parse()解析返回结果。</li>
<li>其余扩展名文件。它们都被当做.js文件载入</li>
</ul>
### js模块编译
### c/c++模块编译
<div class="article-context-child-h6">.node的模块文件并不需要编译，因为它是编写C/C++模块之后编译生成的</div>
<div id="gitalk-container"></div>
<script src="https://cdn.bootcss.com/blueimp-md5/2.12.0/js/md5.min.js"></script><link rel="stylesheet" href="https://unpkg.com/gitalk/dist/gitalk.css"><script src="https://unpkg.com/gitalk/dist/gitalk.min.js"></script>
<script>
var gitalkConfig = {"clientID":"0d016cc631f508b6e723","clientSecret":"17edd0c4b4116641b3eb685bb9551b1070160b5c","repo":"jancechun.github.io","owner":"janceChun","admin":["janceChun"],"distractionFreeMode":false};
gitalkConfig.id = md5(location.pathname);
var gitalk = new Gitalk(gitalkConfig);
gitalk.render("gitalk-container");
</script>
</div>
<footer class="article-footer">
<a data-url="https://jancechun.github.io/2016-05-12.html" data-id="cl6cfaorv0004c0y433nebk5i" data-title="nodejs 学习(一)" class="article-share-link">Share</a>
<ul class="article-tag-list" itemprop="keywords"><li class="article-tag-list-item"><a class="article-tag-list-link" href="/tags/nodejs/" rel="tag">nodejs</a></li></ul>
</footer>
</div>
<!--
<nav id="article-nav">
<a href="/2016-05-17.html" id="article-nav-newer" class="article-nav-link-wrap">
<strong class="article-nav-caption">Newer</strong>
<div class="article-nav-title">
mysql 遇到的坑
</div>
</a>
<a href="/2016-05-06.html" id="article-nav-older" class="article-nav-link-wrap">
<strong class="article-nav-caption">Older</strong>
<div class="article-nav-title">http 缓存</div>
</a>
</nav>
-->
</article>
</section>
<aside id="sidebar">
<div class="widget-wrap">
<h3 class="widget-title">Categories</h3>
<div class="widget">
<ul class="category-list"><li class="category-list-item"><a class="category-list-link" href="/categories/Sentry/">Sentry</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/Sentry-docker/">Sentry docker</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/WebStorm/">WebStorm</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/charles-https/">charles https</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/chrome/">chrome</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/css/">css</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/docker/">docker</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/git/">git</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/grafana/">grafana</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/hexo/">hexo</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/html5/">html5</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/http/">http</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/influxdb/">influxdb</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/javascript/">javascript</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/js/">js</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/mysql/">mysql</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/nodejs/">nodejs</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/npm/">npm</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/python/">python</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/svn/">svn</a></li><li class="category-list-item"><a class="category-list-link" href="/categories/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/">设计模式</a></li></ul>
</div>
</div>
<div class="widget-wrap">
<h3 class="widget-title">Tags</h3>
<div class="widget">
<ul class="tag-list" itemprop="keywords"><li class="tag-list-item"><a class="tag-list-link" href="/tags/JavaScript%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B%E4%B8%8E%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84/" rel="tag">JavaScript数据类型与数据结构</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Sentry/" rel="tag">Sentry</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/WebStorm/" rel="tag">WebStorm</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/ajax/" rel="tag">ajax</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/angular/" rel="tag">angular</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/charles/" rel="tag">charles</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/chrome/" rel="tag">chrome</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/cron/" rel="tag">cron</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/css/" rel="tag">css</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/css%E5%9E%82%E7%9B%B4%E5%B1%85%E4%B8%AD/" rel="tag">css垂直居中</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/css%E6%96%87%E5%AD%97%E5%AF%B9%E9%BD%90/" rel="tag">css文字对齐</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/docker/" rel="tag">docker</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/docker-telegraf-grafana%E5%AE%9E%E8%B7%B5/" rel="tag">docker telegraf grafana实践</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/font/" rel="tag">font</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/git/" rel="tag">git</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/grafana/" rel="tag">grafana</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/html5-download/" rel="tag">html5 download</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/htpps/" rel="tag">htpps</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/http-%E7%BC%93%E5%AD%98/" rel="tag">http 缓存</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/http-%E7%BC%93%E5%AD%98/" rel="tag">http 缓存</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/influxdb-non-negative-derivative/" rel="tag">influxdb non_negative_derivative</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/javascript/" rel="tag">javascript</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/jekyll-%E8%BF%81%E7%A7%BB%E5%88%B0-hexo/" rel="tag">jekyll 迁移到 hexo</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/js-promise/" rel="tag">js promise</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/js%E6%95%B0%E5%AD%97%E6%BA%A2%E5%87%BA/" rel="tag">js数字溢出</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mysql/" rel="tag">mysql</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mysql-brew/" rel="tag">mysql brew</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/nodejs/" rel="tag">nodejs</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/npm/" rel="tag">npm</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/npm-registry/" rel="tag">npm registry</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/python/" rel="tag">python</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/rem/" rel="tag">rem</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/svn/" rel="tag">svn</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%89%8D%E5%90%8E%E7%AB%AF%E5%88%86%E7%A6%BB/" rel="tag">前后端分离</a></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/" rel="tag">设计模式</a></li></ul>
</div>
</div>
<div class="widget-wrap">
<h3 class="widget-title">Tag Cloud</h3>
<div class="widget tagcloud">
<a href="/tags/JavaScript%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B%E4%B8%8E%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84/" style="font-size: 10px;">JavaScript数据类型与数据结构</a> <a href="/tags/Sentry/" style="font-size: 13.33px;">Sentry</a> <a href="/tags/WebStorm/" style="font-size: 10px;">WebStorm</a> <a href="/tags/ajax/" style="font-size: 16.67px;">ajax</a> <a href="/tags/angular/" style="font-size: 20px;">angular</a> <a href="/tags/charles/" style="font-size: 10px;">charles</a> <a href="/tags/chrome/" style="font-size: 10px;">chrome</a> <a href="/tags/cron/" style="font-size: 10px;">cron</a> <a href="/tags/css/" style="font-size: 16.67px;">css</a> <a href="/tags/css%E5%9E%82%E7%9B%B4%E5%B1%85%E4%B8%AD/" style="font-size: 10px;">css垂直居中</a> <a href="/tags/css%E6%96%87%E5%AD%97%E5%AF%B9%E9%BD%90/" style="font-size: 10px;">css文字对齐</a> <a href="/tags/docker/" style="font-size: 13.33px;">docker</a> <a href="/tags/docker-telegraf-grafana%E5%AE%9E%E8%B7%B5/" style="font-size: 10px;">docker telegraf grafana实践</a> <a href="/tags/font/" style="font-size: 10px;">font</a> <a href="/tags/git/" style="font-size: 10px;">git</a> <a href="/tags/grafana/" style="font-size: 13.33px;">grafana</a> <a href="/tags/html5-download/" style="font-size: 10px;">html5 download</a> <a href="/tags/htpps/" style="font-size: 10px;">htpps</a> <a href="/tags/http-%E7%BC%93%E5%AD%98/" style="font-size: 10px;">http 缓存</a> <a href="/tags/http-%E7%BC%93%E5%AD%98/" style="font-size: 10px;">http 缓存</a> <a href="/tags/influxdb-non-negative-derivative/" style="font-size: 10px;">influxdb non_negative_derivative</a> <a href="/tags/javascript/" style="font-size: 13.33px;">javascript</a> <a href="/tags/jekyll-%E8%BF%81%E7%A7%BB%E5%88%B0-hexo/" style="font-size: 10px;">jekyll 迁移到 hexo</a> <a href="/tags/js-promise/" style="font-size: 10px;">js promise</a> <a href="/tags/js%E6%95%B0%E5%AD%97%E6%BA%A2%E5%87%BA/" style="font-size: 10px;">js数字溢出</a> <a href="/tags/mysql/" style="font-size: 13.33px;">mysql</a> <a href="/tags/mysql-brew/" style="font-size: 10px;">mysql brew</a> <a href="/tags/nodejs/" style="font-size: 16.67px;">nodejs</a> <a href="/tags/npm/" style="font-size: 10px;">npm</a> <a href="/tags/npm-registry/" style="font-size: 13.33px;">npm registry</a> <a href="/tags/python/" style="font-size: 16.67px;">python</a> <a href="/tags/rem/" style="font-size: 10px;">rem</a> <a href="/tags/svn/" style="font-size: 10px;">svn</a> <a href="/tags/%E5%89%8D%E5%90%8E%E7%AB%AF%E5%88%86%E7%A6%BB/" style="font-size: 10px;">前后端分离</a> <a href="/tags/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/" style="font-size: 10px;">设计模式</a>
</div>
</div>
<div class="widget-wrap">
<h3 class="widget-title">Archives</h3>
<div class="widget">
<ul class="archive-list"><li class="archive-list-item"><a class="archive-list-link" href="/archives/2022/06/">June 2022</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2021/03/">March 2021</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2019/12/">December 2019</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2018/10/">October 2018</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2018/09/">September 2018</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2018/08/">August 2018</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2018/06/">June 2018</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2018/04/">April 2018</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2017/08/">August 2017</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2017/05/">May 2017</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2017/03/">March 2017</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2017/02/">February 2017</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2017/01/">January 2017</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2016/12/">December 2016</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2016/11/">November 2016</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2016/08/">August 2016</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2016/07/">July 2016</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2016/06/">June 2016</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2016/05/">May 2016</a></li><li class="archive-list-item"><a class="archive-list-link" href="/archives/2016/04/">April 2016</a></li></ul>
</div>
</div>
<div class="widget-wrap">
<h3 class="widget-title">Recent Posts</h3>
<div class="widget">
<ul>
<li>
<a href="/2022-06-18.html">浏览器渲染原理</a>
</li>
<li>
<a href="/2022-06-10.html">rem js计算方案改成css计算</a>
</li>
<li>
<a href="/2021-03-18.html">设计模式-多态</a>
</li>
<li>
<a href="/2019-12-04.html">常见问题CSS设置</a>
</li>
<li>
<a href="/2018-10-18.html">docker sentry 配置企业ldap</a>
</li>
</ul>
</div>
</div>
</aside>
</div>
<footer id="footer">
<div class="outer">
<div id="footer-info" class="inner">
© 2022 janceChun<br>
Powered by <a href="https://hexo.io/" target="_blank">Hexo</a>
</div>
</div>
</footer>
</div>
<nav id="mobile-nav">
<a href="/" class="mobile-nav-link" >
Home
</a>
<a href="/archives" class="mobile-nav-link" >
Archives
</a>
</nav>
<script src="/js/jquery-3.4.1.min.js"></script>
<script src="/fancybox/jquery.fancybox.min.js"></script>
<script src="/js/script.js"></script>
</div>
</body>
</html>