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16
00-前端工具/01-VS Code的使用.md
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@ -946,11 +946,11 @@ CSS Peek 对 Vue 没有支持，该插件提供了对 Vue 文件的支持。
- Ayu
* [Snazzy Plus](https://marketplace.visualstudio.com/items?itemName=akarlsten.vscode-snazzy-akarlsten)
- [Snazzy Plus](https://marketplace.visualstudio.com/items?itemName=akarlsten.vscode-snazzy-akarlsten)
* [Dainty](https://marketplace.visualstudio.com/items?itemName=alexanderte.dainty-vscode)
- [Dainty](https://marketplace.visualstudio.com/items?itemName=alexanderte.dainty-vscode)
* `SynthWave '84`
- `SynthWave '84`
- GitHub Plus Theme：白色主题
@ -996,12 +996,10 @@ CSS Peek 对 Vue 没有支持，该插件提供了对 Vue 文件的支持。
- [Mac Vscode 快捷键](https://lsqy.tech/2020/03/14/20200314Mac-Vscode%E5%BF%AB%E6%8D%B7%E9%94%AE/)
* [使用 VSCode 的一些技巧](https://mp.weixin.qq.com/s?src=11&timestamp=1591581536&ver=2387&signature=i4xLZlLe1Gkl7OiBIhPO*VSeNB5lzFgTY-dgNW9E9ZbtIAv4bnJ1RdAAZdhvDw*cg-DmMcUa-V8NSUdV-tthmXZCq3ht4edCweq6v0QxKjnh8IuAxyyh5qymdRui*8iE&new=1)
- [使用 VSCode 的一些技巧](https://mp.weixin.qq.com/s?src=11&timestamp=1591581536&ver=2387&signature=i4xLZlLe1Gkl7OiBIhPO*VSeNB5lzFgTY-dgNW9E9ZbtIAv4bnJ1RdAAZdhvDw*cg-DmMcUa-V8NSUdV-tthmXZCq3ht4edCweq6v0QxKjnh8IuAxyyh5qymdRui*8iE&new=1)
## 我的公众号
---
想学习<font color=#0000ff>**代码之外的技能**</font>？不妨关注我的微信公众号：**千古壹号**。
本作品采用[知识共享署名-非商业性使用-相同方式共享 4.0 国际许可协议](https://creativecommons.org/licenses/by-nc-sa/4.0/)进行许可。
扫一扫，你将发现另一个全新的世界，而这将是一场美丽的意外：
![](http://img.smyhvae.com/20190101.png)
![](https://img.smyhvae.com/20210329_1930.png)

2
04-JavaScript基础/13-内置对象 String：字符串的常见方法.md
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@ -405,7 +405,7 @@ for (var i = 0; i < str.length; i++) {
- `(1)` 从指定位置开始，截取到最后。
- `(-3)` 从倒数第几个开始，截取到最后.
- `(-3)` 从倒数第几个开始，截取到最后。
备注：ECMAscript 没有对 `substr()` 方法进行标准化，因此不建议使用它。

33
13-前端面试/01-面试必看/09-浏览器渲染机制.md
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@ -78,7 +78,7 @@ PS：该DTD包含所有的HTML元素和属性，但包括展示性的和弃用
**渲染树**包含了网页中有哪些节点、节点的从属关系、以及节点的CSS样式（大小、颜色等）。
我们写完前端代码之后，计算机通过解释器把代码文本翻译成机器能理解的数据结构。比如说，html标签是由一对一对的尖括号表述的，可以被浏览器解析为有含义的标记。这些标记被翻译成节点对象，存放到链型数据结构中。这些节点被称之为**DOM对象**，这个链型数据结构就是**渲染树**。
浏览器下载完html文档之后，第一步是先将其解析成文本。而html标签是由一对一对的尖括号表述的，可以被浏览器解析为有含义的标记。这些标记被翻译成节点对象，存放到链型数据结构中。这些节点被称之为**DOM对象**，这个链型数据结构就是**渲染树**。
### 渲染过程（重要）
@ -92,13 +92,13 @@ PS：该DTD包含所有的HTML元素和属性，但包括展示性的和弃用
- CSSOM（CSS Rule Tree）：浏览器将CSS解析成树形的数据结构。CSSOM包含了节点的CSS样式（大小、颜色等）。
- 渲染树（Render Tree）: DOM 树与 CSSOM 树合并后形成渲染树。渲染树只包含渲染网页所需的节点（但并不知道位置）。
- 渲染树（Render Tree）: DOM 树与 CSSOM 树**合并**后形成渲染树。渲染树只包含渲染网页所需的节点（但并不知道位置）。
- 布局（Layout）: 计算出每个节点在屏幕中的**位置和大小**。
- 绘制（Painting）：按照算出来的规则，通过显卡，把内容画出来。
- composite：合成。浏览器在绘制的时候，一开始不会把所有的内容都画在同一层上。需要把这些层合成到一起，最终显示在屏幕上。
- composite：合成。浏览器在绘制的时候，一开始不会把所有的内容都画在同一层上。需要把这些内容画在不同的曾上，最终合并到一起，并显示在屏幕上。
参考链接：
@ -106,7 +106,7 @@ PS：该DTD包含所有的HTML元素和属性，但包括展示性的和弃用
### 关键渲染路径
浏览器渲染分为五个阶段：
说到渲染，就不得不提到“关键渲染路径”，它描述的是渲染从触发到绘制的过程。浏览器渲染经历了五个阶段：
> JavaScript/CSS --> Style --> Layout --> Paint --> Composite
@ -116,9 +116,9 @@ PS：该DTD包含所有的HTML元素和属性，但包括展示性的和弃用
关键渲染路径描述的是渲染从触发到绘制的全过程，一共经历了五个阶段：
（1）通过JS、CSS代码来**触发**页面上的视觉变化。
（1）**触发视觉的变化：**通过JS、CSS代码来**触发**页面上的视觉变化。比如通过 jQuery添加节点、通过CSS添加动画，都可以触发视觉上的变化。
（2）Style：浏览器对样式进行计算。
（2）Style：浏览器对样式进行计算。匹配选择器，计算哪些CSS受到了影响。
（3）layout：同上一段。
@ -134,15 +134,15 @@ PS：该DTD包含所有的HTML元素和属性，但包括展示性的和弃用
## 重排（回流）：Reflow
## 布局/回流/重排
### 定义
**重排 Reflow**：
布局 layout：
渲染对象在创建完成并添加到渲染树时，是将DOM节点和它对应的样式结合起来，并不包含位置和大小信息。
我们还需要通过 `Layout` 布局阶段，来计算它们在设备视口(viewport)内的确切位置和大小，计算这些值的过程称为`回流`、`布局`或`重排`。
我们还需要通过 `Layout` 布局阶段，来计算它们在设备视口(viewport)内的确切位置和大小，计算这些值的过程称为`回流`、`布局`或`重排（Reflow）`。
@ -152,11 +152,11 @@ PS：该DTD包含所有的HTML元素和属性，但包括展示性的和弃用
- [你真的了解回流和重绘吗](https://github.com/chenjigeng/blog/issues/4)
### 什么时候会触发 Reflow
### 什么时候会触发布局
> 核心就是围绕DOM元素的**大小**和**位置**。
DOM元素的**大小**和**位置**发生变化的时候，会触发布局。
- 增加、删除DOM节点
- 增加、删除DOM元素
- display: none
@ -176,22 +176,21 @@ PS：该DTD包含所有的HTML元素和属性，但包括展示性的和弃用
## 重绘：Repaint
## 绘制/重绘
### 定义
**重绘制 Repaint**：当各种盒子的位置、大小以及其他属性，例如颜色、字体大小等都确定下来后，浏览器便把这些元素都按照各自的特性绘制一遍，于是页面的内容出现了，这个过程称之为 Repaint。
**绘制 paint**：当各种盒子的位置、大小以及其他属性，例如颜色、字体大小等都确定下来后，浏览器便把这些元素都按照各自的特性绘制一遍，于是页面的内容出现了，这个过程也称之为 Repaint（重绘制）。
说白了，页面要呈现的内容，统统画在屏幕上，这就叫 Repaint。
### 什么时候触发 Repaint
### 什么时候触发绘制
- DOM改动
- CSS改动
其实，就是判断当前呈现的内容是否发生变化（无论这个变化是通过DOM改动还是CSS改动）。只要页面显示的内容不一样了，肯定要 Repaint。
其实，就是判断当视觉上是否发生变化（无论这个变化是通过DOM改动还是CSS改动）。只要页面显示的内容不一样了，肯定要 Repaint。
**面试总结：**

4
13-前端面试/02-前端性能优化/01-性能优化的指标和工具.md
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@ -84,7 +84,6 @@ network里的信息挺多，我们可以将其保存下来，留着以后做分
- Content Download：收到响应后，资源的下载时间。如果值越大，表明下载时间越长。有些同步加载的资源会造成阻塞，导致网页的整体加载时间过长，让用户等待太久。
**TTFB** 是一个很重要的指标，它表示的是：请求发出到响应，到底要经历多久。TTFB 可以给我们一个很直观的感受，我们网站的请求和响应到底是快还是慢，很大程度上是由 TTFB 决定。
影响 TTFB 的因素是什么呢？比如：
@ -267,7 +266,7 @@ RAIL 模型是Google提出的可以量化性能的测量**标准**。我们做
### preformance：性能表现
### performance：性能表现
![](http://img.smyhvae.com/20210116-0959.png)
@ -362,7 +361,6 @@ WebPageTest 在世界各地提供了非常多的服务器，在每个服务器
![](http://img.smyhvae.com/20210115-2226.png)
### WebPageTest 报告分析
淘宝网站性能测试报告：

176
LICENSE
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@ -1,176 +0,0 @@
Copyright (c) 2019 千古壹号
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7
README.md
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@ -35,11 +35,8 @@
我建了一个“前端学习”的微信交流群，在下方公众号里回复「前端学习」，拉你进群：
- 进群暗号：前端学习。加我好友后，请主动发「自我介绍」，我每晚统一处理。
- 进群暗号：前端学习。
- 群里只做两件事：学习和分享。
如果你还想学习**更多技能**，不妨关注我的微信公众号：**千古壹号**。
![](https://img.smyhvae.com/20200101.png)
![](http://img.smyhvae.com/20210329_1930.png)