利用 Markdown 画一些流程图、时序图、甘特图等

```flow
start=>start: 接收到消息
info=>operation: 读取信息
setCache=>operation: 更新缓存
end=>end: 处理结束
start->info->setCache->end
```

```flow
st=>start: 开始
op=>operation: 操作
cond=>condition: 判断是否？
e=>end: 结束
st->op->cond
cond(yes)->e
cond(no)->op
```

```flow
start=>start: API请求
cache=>operation: 读取Redis缓存
cached=>condition: 是否有缓存？
sendMq=>operation: 发送MQ，后台服务更新缓存
info=>operation: 读取信息
setCache=>operation: 保存缓存
end=>end: 返回信息
start->cache->cached
cached(yes)->sendMq
cached(no)->info
info->setCache
setCache->end
sendMq->end
```

```flow
st=>start: Start|past:>http://www.google.com[blank]
e=>end: End:>http://www.google.com
op1=>operation: get_hotel_ids|past
op2=>operation: get_proxy|current
sub1=>subroutine: get_proxy|current
op3=>operation: save_comment|current
op4=>operation: set_sentiment|current
op5=>operation: set_record|current
cond1=>condition: ids_remain空?
cond2=>condition: proxy_list空?
cond3=>condition: ids_got空?
cond4=>condition: 爬取成功??
cond5=>condition: ids_remain空?
io1=>inputoutput: ids-remain
io2=>inputoutput: proxy_list
io3=>inputoutput: ids-got
st->op1(right)->io1->cond1
cond1(yes)->sub1->io2->cond2
cond2(no)->op3
cond2(yes)->sub1
cond1(no)->op3->cond4
cond4(yes)->io3->cond3
cond4(no)->io1
cond3(no)->op4
cond3(yes, right)->cond5
cond5(yes)->op5
cond5(no)->cond3
op5->e
```

```sequence
Title:时序图示例
客户端->服务端: 我想找你拿下数据 SYN
服务端-->客户端: 我收到你的请求啦 ACK+SYN
客户端->>服务端: 我收到你的确认啦，我们开始通信吧 ACK
Note right of 服务端: 我是一个服务端
Note left of 客户端: 我是一个客户端
Note over 服务端,客户端: TCP 三次握手
participant 观察者
```

```sequence
客户端->打印机: 打印请求(id)
打印机->数据库:请求数据(id)
Note right of 数据库: 执行SQL获取数据
数据库-->打印机:返回数据信息
Note right of 打印机:使用数据打印
打印机-->>客户端:返回打印结果
客户端->客户端:等待提取结果
```

```mermaid
graph TD;
    A-->B;
    A-->C;
    B-->D;
    C-->D;
```

```mermaid
sequenceDiagram
    participant Alice
    participant Bob
    Alice->>John: Hello John, how are you?
    loop Healthcheck
        John->>John: Fight against hypochondria
    end
    Note right of John: Rational thoughts <br/>prevail...
    John-->>Alice: Great!
    John->>Bob: How about you?
    Bob-->>John: Jolly good!
```

```mermaid
gantt
dateFormat  YYYY-MM-DD
title Adding GANTT diagram to mermaid

section A section
Completed task            :done,    des1, 2014-01-06,2014-01-08
Active task               :active,  des2, 2014-01-09, 3d
Future task               :         des3, after des2, 5d
Future task2               :         des4, after des3, 5d

section B section
Completed task            :done,    des1, 2014-01-06,2014-01-08
Active task               :active,  des2, 2014-01-09, 2d
Future task               :         des3, after des2, 3d
Future task2               :         des4, after des3, 6d

section C section
Completed task            :done,    des1, 2014-01-06,2014-01-08
Active task               :active,  des2, 2014-01-09, 1d
Future task               :         des3, after des2, 6d
Future task2               :         des4, after des3, 2d
```

```mermaid
classDiagram
Class01 <|-- AveryLongClass : Cool
Class03 *-- Class04
Class05 o-- Class06
Class07 .. Class08
Class09 --> C2 : Where am i?
Class09 --* C3
Class09 --|> Class07
Class07 : equals()
Class07 : Object[] elementData
Class01 : size()
Class01 : int chimp
Class01 : int gorilla
Class08 <--> C2: Cool label
```

```mermaid
gitGraph
   commit
   commit
   branch develop
   checkout develop
   commit
   commit
   checkout main
   merge develop
   commit
   commit
```

```mermaid
journey
    title My working day
    section Go to work
      Make tea: 5: Me
      Go upstairs: 3: Me
      Do work: 1: Me, Cat
    section Go home
      Go downstairs: 5: Me
      Sit down: 5: Me
```

```mermaid
pie title Pets adopted by volunteers
    "Dogs" : 386
    "Cats" : 85
    "Rats" : 15
```