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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 - 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 - 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/) - [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： ![](https://img.smyhvae.com/20210329_1930.png)
![](http://img.smyhvae.com/20190101.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。 - `(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。 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）。 **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） ### 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）。 - 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**。 - 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。 - 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： 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 ### 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 > 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： 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。 （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 ### 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。 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) - [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 - 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
## 绘制/重绘
## 重绘：Repaint
### 定义 ### 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。 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 - DOM改动
- CSS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：** **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。 - 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。 **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： 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) ![](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) ![](http://img.smyhvae.com/20210115-2226.png)
### WebPageTest 报告分析 ### WebPageTest 报告分析
淘宝网站性能测试报告： 淘宝网站性能测试报告：

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LICENSE
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@ -1,176 +0,0 @@
Copyright (c) 2019 千古壹号
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c. The disclaimer of warranties and limitation of liability provided above shall be interpreted in a manner that, to the extent possible, most closely approximates an absolute disclaimer and waiver of all liability.
### Section 6 – Term and Termination.
a. This Public License applies for the term of the Copyright and Similar Rights licensed here. However, if You fail to comply with this Public License, then Your rights under this Public License terminate automatically.
b. Where Your right to use the Licensed Material has terminated under Section 6(a), it reinstates:
1. automatically as of the date the violation is cured, provided it is cured within 30 days of Your discovery of the violation; or
2. upon express reinstatement by the Licensor.
For the avoidance of doubt, this Section 6(b) does not affect any right the Licensor may have to seek remedies for Your violations of this Public License.
c. For the avoidance of doubt, the Licensor may also offer the Licensed Material under separate terms or conditions or stop distributing the Licensed Material at any time; however, doing so will not terminate this Public License.
d. Sections 1, 5, 6, 7, and 8 survive termination of this Public License.
### Section 7 – Other Terms and Conditions.
a. The Licensor shall not be bound by any additional or different terms or conditions communicated by You unless expressly agreed.
b. Any arrangements, understandings, or agreements regarding the Licensed Material not stated herein are separate from and independent of the terms and conditions of this Public License.
### Section 8 – Interpretation.
a. For the avoidance of doubt, this Public License does not, and shall not be interpreted to, reduce, limit, restrict, or impose conditions on any use of the Licensed Material that could lawfully be made without permission under this Public License.
b. To the extent possible, if any provision of this Public License is deemed unenforceable, it shall be automatically reformed to the minimum extent necessary to make it enforceable. If the provision cannot be reformed, it shall be severed from this Public License without affecting the enforceability of the remaining terms and conditions.
c. No term or condition of this Public License will be waived and no failure to comply consented to unless expressly agreed to by the Licensor.
d. Nothing in this Public License constitutes or may be interpreted as a limitation upon, or waiver of, any privileges and immunities that apply to the Licensor or You, including from the legal processes of any jurisdiction or authority.
> Creative Commons is not a party to its public licenses. Notwithstanding, Creative Commons may elect to apply one of its public licenses to material it publishes and in those instances will be considered the “Licensor.” Except for the limited purpose of indicating that material is shared under a Creative Commons public license or as otherwise permitted by the Creative Commons policies published at [creativecommons.org/policies](http://creativecommons.org/policies), Creative Commons does not authorize the use of the trademark “Creative Commons” or any other trademark or logo of Creative Commons without its prior written consent including, without limitation, in connection with any unauthorized modifications to any of its public licenses or any other arrangements, understandings, or agreements concerning use of licensed material. For the avoidance of doubt, this paragraph does not form part of the public licenses.
>
> Creative Commons may be contacted at creativecommons.org

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README.md
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@ -35,11 +35,8 @@
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