画图

https://support.typora.io/Draw-Diagrams-With-Markdown/

https://mermaid-js.github.io/mermaid/#/

Sequence

Alice->Bob: Hello Bob, how are you?
Note right of Bob: Bob thinks
Bob-->Alice: I am good thanks!

Flowchart

st=>start: Start
op=>operation: Your Operation
cond=>condition: Yes or No?
e=>end

st->op->cond
cond(yes)->e
cond(no)->op

Mermaid: Sequence

%% Example of sequence diagram
  sequenceDiagram
    Alice->>Bob: Hello Bob, how are you?
    alt is sick
    Bob->>Alice: Not so good :(
    else is well
    Bob->>Alice: Feeling fresh like a daisy
    end
    opt Extra response
    Bob->>Alice: Thanks for asking
    end
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: Flowchart

graph LR
A[Hard edge] -->B(Round edge)
    B --> C{Decision}
    C -->|One| D[Result one]
    C -->|Two| E[Result two]
graph TD
A[Christmas] -->|Get money| B(Go shopping)
B --> C{Let me think}
C -->|One| D[Laptop]
C -->|Two| E[iPhone]
C -->|Three| F[fa:fa-car Car]

Mermaid: Gantt

%% Example with selection of syntaxes
        gantt
        dateFormat  YYYY-MM-DD
        title Adding GANTT diagram functionality 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 Critical tasks
        Completed task in the critical line :crit, done, 2014-01-06,24h
        Implement parser and jison          :crit, done, after des1, 2d
        Create tests for parser             :crit, active, 3d
        Future task in critical line        :crit, 5d
        Create tests for renderer           :2d
        Add to mermaid                      :1d

        section Documentation
        Describe gantt syntax               :active, a1, after des1, 3d
        Add gantt diagram to demo page      :after a1  , 20h
        Add another diagram to demo page    :doc1, after a1  , 48h

        section Last section
        Describe gantt syntax               :after doc1, 3d
        Add gantt diagram to demo page      : 20h
        Add another diagram to demo page    : 48h

Mermaid: Class Diagram

classDiagram
      Animal <|-- Duck
      Animal <|-- Fish
      Animal <|-- Zebra
      Animal : +int age
      Animal : +String gender
      Animal : +isMammal()
      Animal : +mate()
      class Duck{
          +String beakColor
          +swim()
          +quack()
      }
      class Fish{
          -int sizeInFeet
          -canEat()
      }
      class Zebra{
          +bool is_wild
          +run()
      }
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
classDiagram
classA <|-- classB : implements
classC *-- classD : composition
classE o-- classF : association

Mermaid: State Diagram

stateDiagram
    [*] --> Still
    Still --> [*]

    Still --> Moving
    Moving --> Still
    Moving --> Crash
    Crash --> [*]

Mermaid: Pie Chart

pie
    title Pie Chart
    "Dogs" : 386
    "Cats" : 85
    "Rats" : 150