markdown测试
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```
3. 使用 `<br/>`
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# 公式
$\Delta = \frac{-b\pm\sqrt{b^2-4ac}}{4a}$
## Guide
这是一篇讲解如何正确使用 **Markdown** 的排版示例，学会这个很有必要，能让你的文章有更佳清晰的排版。
> 引用文本：Markdown is a text formatting syntax inspired
## 语法指导
### 普通内容
这段内容展示了在内容里面一些排版格式，比如：
- **加粗** - `**加粗**`
- *倾斜* - `*倾斜*`
- ~~删除线~~ - `~~删除线~~`
- `Code 标记` - `` `Code 标记` ``
- [超级链接](https://hacpai.com) - `[超级链接](https://hacpai.com)`
- [username@gmail.com](mailto:username@gmail.com) - `[username@gmail.com](mailto:username@gmail.com)`
### 提及用户
@Vanessa 通过 `@User` 可以在内容中提及用户，被提及的用户将会收到系统通知。
> NOTE:
>
> 1. @用户名之后需要有一个空格
> 2. 新手没有艾特的功能权限
### 表情符号 Emoji
支持大部分标准的表情符号，可使用输入法直接输入，也可手动输入字符格式。通过输入 `:` 触发自动完成，可在个人设置中[设置常用表情](https://hacpai.com/settings/function)。
#### 一些表情例子
:smile: :laughing: :dizzy_face: :sob: :cold_sweat: :sweat_smile::cry: :triumph: :heart_eyes: :relieved:
:+1: :-1: :100: :clap: :bell: :gift: :question: :bomb: :heart: :coffee: :cyclone: :bow: :kiss: :pray: :anger:
### 大标题 - Heading 3
你可以选择使用 H1 至 H6，使用 ##(N) 打头。建议帖子或回帖中的顶级标题使用 Heading 3，不要使用 1 或 2，因为 1 是系统站点级，2 是帖子标题级。
> NOTE: 别忘了 # 后面需要有空格！
#### Heading 4
##### Heading 5
###### Heading 6
### 图片
```
!(http://image-path.png)
!(http://image-path.png "图片 Title 值")
```
支持复制粘贴直接上传。
### 代码块
#### 普通
```
*emphasize* **strong**
_emphasize_ __strong__
var a = 1
```
#### 语法高亮支持
如果在 ``` 后面跟随语言名称，可以有语法高亮的效果哦，比如：
##### 演示 Go 代码高亮
```go
package main
import "fmt"
func main() {
fmt.Println("Hello, 世界")
}
```
##### 演示 Java 高亮
```java
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello World!");
}
}
```
> Tip: 语言名称支持下面这些：`ruby`, `python`, `js`, `html`, `erb`, `css`, `coffee`, `bash`, `json`, `yml`, `xml` ...
### 有序、无序、任务列表
#### 无序列表
- Java
- Spring
- IoC
- AOP
- Go
- gofmt
- Wide
- Node.js
- Koa
- Express
#### 有序列表
1. Node.js
1.1. Express
1.2. Koa
1.3. Sails
2. Go
2.1. gofmt
2.2. Wide
3. Java
3.1. Latke
3.2. IDEA
#### 任务列表
- 发布 Sym
- 发布 Solo
- [ ] 预约牙医
### 表格
如果需要展示数据什么的，可以选择使用表格。
| header 1 | header 3 |
| -------- | -------- |
| cell 1 | cell 2 |
| cell 3 | cell 4 |
| cell 5 | cell 6 |
### 隐藏细节
<details>
<summary>这里是摘要部分。</summary>
这里是细节部分。
</details>
### 段落
空行可以将内容进行分段，便于阅读。（这是第一段）
使用空行在 Markdown 排版中相当重要。（这是第二段）
### 数学公式
多行公式块：
$$
\frac{1}{
\Bigl(\sqrt{\phi \sqrt{5}}-\phi\Bigr) e^{
\frac25 \pi}} = 1+\frac{e^{-2\pi}} {1+\frac{e^{-4\pi}} {
1+\frac{e^{-6\pi}}
{1+\frac{e^{-8\pi}}{1+\cdots}}
}
}
$$
行内公式：
公式 $a^2 + b^2 = \color{red}c^2$ 是行内。
### 流程图
```mermaid
graph TB
c1-->a2
subgraph one
a1-->a2
end
subgraph two
b1-->b2
end
subgraph three
c1-->c2
end
```
### 时序图
```mermaid
sequenceDiagram
Alice->>John: Hello John, how are you?
loop Every minute
John-->>Alice: Great!
end
```
### 甘特图
```mermaid
gantt
title A Gantt Diagram
dateFormatYYYY-MM-DD
section Section
A task :a1, 2019-01-01, 30d
Another task :after a1, 20d
section Another
Task in sec :2019-01-12, 12d
another task : 24d
```
### 图表
```echarts
{
"title": { "text": "最近 30 天" },
"tooltip": { "trigger": "axis", "axisPointer": { "lineStyle": { "width": 0 } } },
"legend": { "data": ["帖子", "用户", "回帖"] },
"xAxis": [{
"type": "category",
"boundaryGap": false,
"data": ["2019-05-08","2019-05-09","2019-05-10","2019-05-11","2019-05-12","2019-05-13","2019-05-14","2019-05-15","2019-05-16","2019-05-17","2019-05-18","2019-05-19","2019-05-20","2019-05-21","2019-05-22","2019-05-23","2019-05-24","2019-05-25","2019-05-26","2019-05-27","2019-05-28","2019-05-29","2019-05-30","2019-05-31","2019-06-01","2019-06-02","2019-06-03","2019-06-04","2019-06-05","2019-06-06","2019-06-07"],
"axisTick": { "show": false },
"axisLine": { "show": false }
}],
"yAxis": [{ "type": "value", "axisTick": { "show": false }, "axisLine": { "show": false }, "splitLine": { "lineStyle": { "color": "rgba(0, 0, 0, .38)", "type": "dashed" } } }],
"series": [
{
"name": "帖子", "type": "line", "smooth": true, "itemStyle": { "color": "#d23f31" }, "areaStyle": { "normal": {} }, "z": 3,
"data": ["18","14","22","9","7","18","10","12","13","16","6","9","15","15","12","15","8","14","9","10","29","22","14","22","9","10","15","9","9","15","0"]
},
{
"name": "用户", "type": "line", "smooth": true, "itemStyle": { "color": "#f1e05a" }, "areaStyle": { "normal": {} }, "z": 2,
"data": ["31","33","30","23","16","29","23","37","41","29","16","13","39","23","38","136","89","35","22","50","57","47","36","59","14","23","46","44","51","43","0"]
},
{
"name": "回帖", "type": "line", "smooth": true, "itemStyle": { "color": "#4285f4" }, "areaStyle": { "normal": {} }, "z": 1,
"data": ["35","42","73","15","43","58","55","35","46","87","36","15","44","76","130","73","50","20","21","54","48","73","60","89","26","27","70","63","55","37","0"]
}
]
}
```
### 五线谱
```abc
X: 24
T: Clouds Thicken
C: Paul Rosen
S: Copyright 2005, Paul Rosen
M: 6/8
L: 1/8
Q: 3/8=116
R: Creepy Jig
K: Em
|:"Em"EEE E2G|"C7"_B2A G2F|"Em"EEE E2G|\
"C7"_B2A "B7"=B3|"Em"EEE E2G|
"C7"_B2A G2F|"Em"GFE "D (Bm7)"F2D|\
1"Em"E3-E3:|2"Em"E3-E2B|:"Em"e2e gfe|
"G"g2ab3|"Em"gfeg2e|"D"fedB2A|"Em"e2e gfe|\
"G"g2ab3|"Em"gfe"D"f2d|"Em"e3-e3:|
```
### 多媒体
支持 v.qq.com，youtube.com，youku.com，coub.com，facebook.com/video，dailymotion.com，.mp4，.m4v，.ogg，.ogv，.webm，.mp3，.wav 链接解析
https://v.qq.com/x/cover/zf2z0xpqcculhcz/y0016tj0qvh.html
## 快捷键
我们的编辑器支持很多快捷键，具体请参考 [键盘快捷键](https://hacpai.com/article/1474030007391)（或者按 "`?` ":smirk_cat:）
本帖最后由 这个显卡不太冷 于 2019-12-17 13:42 编辑
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`>_<`
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`>_<` `<test>`
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