-
Notifications
You must be signed in to change notification settings - Fork 0
/
engine-runtime-call-stack.html
203 lines (179 loc) · 6.47 KB
/
engine-runtime-call-stack.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
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>语言引擎，运行时和调用栈概述</title>
<meta name="description" content="A framework for easily creating beautiful presentations using HTML">
<meta name="author" content="Hakim El Hattab">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<link rel="stylesheet" href="css/reveal.css">
<link rel="stylesheet" href="css/theme/black.css" id="theme">
<link rel="stylesheet" href="css/default.css">
<!-- Theme used for syntax highlighting of code -->
<link rel="stylesheet" href="lib/css/zenburn.css">
<!-- Printing and PDF exports -->
<script>
var link = document.createElement('link');
link.rel = 'stylesheet';
link.type = 'text/css';
link.href = window.location.search.match(/print-pdf/gi) ? 'css/print/pdf.css' : 'css/print/paper.css';
document.getElementsByTagName('head')[0].appendChild(link);
</script>
<!--[if lt IE 9]>
<script src="lib/js/html5shiv.js"></script>
<![endif]-->
</head>
<body>
<div class="reveal">
<div class="slides">
<section class="center">
<h2>JavaScript 引擎、运行时和调用栈概述</h2>
<p>
<small><a href="https://codeigniter.org.cn" target="_blank">Hex</a> 为您分享 / Github: <a href="https://github.com/hex-ci" target="_blank">@hex-ci</a></small>
</p>
</section>
<section>
<div>
<img width="80%" data-src="images/engine-runtime-call-stack/1.png">
</div>
</section>
<section>
<h2>目录</h2>
<ul>
<li>JavaScript 引擎</li>
<li>运行时</li>
<li>调用栈</li>
<li>并发和事件循环</li>
</ul>
</section>
<section>
<h3>JavaScript 引擎</h3>
<div>
<img width="40%" data-src="images/engine-runtime-call-stack/2.png">
</div>
<ul>
<li>堆内存 - 在这里分配内存</li>
<li>调用栈 - 用来存储代码执行时其活跃子程序的堆栈结构</li>
</ul>
</section>
<section>
<h3>运行时</h3>
<div>
<img width="50%" data-src="images/engine-runtime-call-stack/3.png">
</div>
</section>
<section>
<h3>调用栈</h3>
<p>调用栈是一种数据结构，里面会记录我们在程序中的大概位置。</p>
<p>当执行进入一个函数，把它置于栈的顶部。</p>
<p>如果从函数中返回则从栈顶部移除函数。</p>
<p>这就是调用栈所能够做的事情。</p>
</section>
<section>
<h3>调用栈</h3>
<pre><code class="hljs javascript" data-trim>
function multiply(x, y) {
return x * y;
}
function printSquare(x) {
var s = multiply(x, x);
console.log(s);
}
printSquare(5);
</code></pre>
<p>当引擎开始执行这段代码的时候，调用栈会被清空。</p>
</section>
<section>
<h3>调用栈</h3>
<div>
<img width="45%" data-src="images/engine-runtime-call-stack/4.png">
</div>
<p>调用栈中的每个入口被称为堆栈结构。</p>
</section>
<section>
<h3>调用栈</h3>
<p>当发生异常的时候可以看到调用栈的状态</p>
<pre><code class="hljs javascript" data-trim>
function foo() {
throw new Error('SessionStack will help you resolve crashes :)');
}
function bar() {
foo();
}
function start() {
bar();
}
start();
</code></pre>
<p>
<img width="50%" data-src="images/engine-runtime-call-stack/5.png">
</p>
</section>
<section>
<h3>堆栈溢出</h3>
<pre><code class="hljs javascript" data-trim>
function foo() {
foo();
}
foo();
</code></pre>
<p>
<img width="40%" data-src="images/engine-runtime-call-stack/6.png">
</p>
</section>
<section>
<h3>堆栈溢出</h3>
<p>浏览器会显示如下错误</p>
<p><img width="50%" data-src="images/engine-runtime-call-stack/7.png"></p>
</section>
<section>
<h3>并发和事件循环</h3>
<p>由于 JavaScript 只有一个调用栈，如果运行很慢会发生什么？</p>
<p class="fragment">
<img width="50%" data-src="images/engine-runtime-call-stack/8.jpeg">
</p>
</section>
<section>
<h3>并发和事件循环</h3>
<p>如何不阻塞 UI 且不让浏览器停止响应来执行运行缓慢的代码呢？</p>
<p class="fragment">使用异步回调</p>
<p class="fragment">
----------------------------------------<br>
更多内容，我们将在<br>
《在 V8 引擎中如何写最佳代码的 5 条小技巧》<br>分享中进行详细阐述
</p>
</section>
<section style="text-align: left;">
<h1>THE END</h1>
<p>谢谢！</p>
</section>
</div>
</div>
<script src="lib/js/head.min.js"></script>
<script src="js/reveal.js"></script>
<script>
// More info https://github.com/hakimel/reveal.js#configuration
Reveal.initialize({
controls: true,
progress: true,
history: true,
center: false,
width: '100%',
height: '100%',
// margin: 100,
transition: 'slide',
// More info https://github.com/hakimel/reveal.js#dependencies
dependencies: [
{ src: 'lib/js/classList.js', condition: function() { return !document.body.classList; } },
{ src: 'plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
{ src: 'plugin/markdown/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
{ src: 'plugin/highlight/highlight.js', async: true, callback: function() { hljs.initHighlightingOnLoad(); } },
{ src: 'plugin/zoom-js/zoom.js', async: true },
{ src: 'plugin/notes/notes.js', async: true }
]
});
</script>
</body>
</html>