Mermaid 学习

在 VS code 中安装插件 Markdown Preview Mermaid Support，则便可支持 Mermaid

流程图

flowchart

graph LR;
A-->B;
A-->C;
B-->D;
C-->D;

时序图

sequence diagram

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
prevail...
　　　John-->Alice:Great!
　　　John->Bob: How about you?
　　　Bob-->John: Jolly good!

甘特图

gantt diagram

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 json　　　　　　: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

Graph

graph LR
    A --> B

这是申明一个由左到右，水平向右的图。

graph LR
A -->B

可能方向有：

• TB - top bottom
• BT - bottom top
• RL - right left
• LR - left right
• TD - same as TB

节点与形状

默认节点

graph LR
id1

• 注意：id 显示在节点内部。

graph LR
id1

文本节点

graph LR
id[This is the text in the box];

展示如下：

graph LR
id[This is the text in the box];

圆角节点

graph LR
id(This is the text in the box);

即：

graph LR
id(This is the text in the box);

圆节点(The form of a circle)

graph LR
id((This is the text in the circle));

graph LR
id((This is the text in the circle));

非对称节点(asymetric shape)

graph LR
id>This is the text in the box]

graph LR
id>This is the text in the box]

菱形节点(rhombus)

graph LR
id{This is the text in the box}

graph LR
id{This is the text in the box}

连接线

节点间的连接线有多种形状，而且可以在连接线中加入标签：

箭头形连接

graph LR;
  A-->B;

graph LR;
A-->B;

开放行连接

graph LR
A --- B

graph LR
A --- B

标签连接

graph LR
A -- This is the label text --- B;

graph LR
A -- This is the label text --- B;

箭头标签连接

A–>|text|B 或者 A– text –>B

graph LR
A-- text -->B

虚线(dotted link，点连线)

-.-> 和 -.-

graph LR
A-.->B

graph LR
A-.-B

标签虚线

graph LR
A-.text.->B

graph LR
A-.text.->B

粗实线

==>

graph LR
A==>B

标签粗线

=\=text\==> 和 =\=text\===

graph LR
A==text==>B

graph LR
A==text===B

特殊的语法

使用引号可以抑制一些特殊的字符的使用，可以避免一些不必要的麻烦。

graph LR
d1["This is the (text) in the box"]

graph LR
d1["This is the (text) in the box"]

html 字符的转义字符

转义字符的使用语法

流程图定义如下：

graph LR
        A["A double quote:#quot;"]-->B["A dec char:#9829;"]

graph LR
A["A double quote:#quot;"]-->B["A dec char:#9829;"]

子图(Subgraphs)

subgraph title
graph definition
end

示例：

graph TB
        subgraph one
        a1 --> a2
        end
        subgraph two
        b2 --> b2
        end
        subgraph three
        c1 --> c2
        end
        c1 --> a2

graph TB
subgraph one
a1 --> a2
end
subgraph two
b2 --> b2
end
subgraph three
c1 --> c2
end
c1 --> a2

基础 fontawesome 支持

想加入来自frontawesome的图表字体，详情请点击：fontawdsome

引用的语法为：++fa:#icon class name#++

graph TD
      B["fa:fa-twitter for peace"]
      B-->C[fa:fa-ban forbidden]
      B-->D(fa:fa-spinner);
      B-->E(A fa:fa-camerra-retro perhaps?);

graph TD
B["fa:fa-twitter for peace"]
B-->C[fa:fa-ban forbidden]
B-->D(fa:fa-spinner);
B-->E(A fa:fa-camerra-retro perhaps?);

更多参考：mermaid docs

图表(graph)

定义连接线的样式

graph LR
     id1(Start)-->id2(Stop)
     style id1 fill:#f9f,stroke:#333,stroke-width:4px;
     style id2 fill:#ccf,stroke:#f66,stroke-width:2px,stroke-dasharray:5,5;

graph LR
id1(Start)-->id2(Stop)
style id1 fill:#f9f,stroke:#333,stroke-width:4px;
style id2 fill:#ccf,stroke:#f66,stroke-width:2px,stroke-dasharray:5,5;

备注：上面的样式参考 CSS 样式。

样式类

为了方便样式的使用，可以定义类来使用样式

类的定义示例：

classDef className fill:#f9f,stroke:#333,stroke-width:4px;

对节点使用样式类：

class nodeId className;

同时对多个节点使用相同的样式类：

class nodeId1,nodeId2 className;

可以在CSS中提前定义样式类，应用在图表的定义中。

graph LR
      A-->B[AAABBB];
      B-->D;
      class A cssClass;

默认样式类：

当没有指定样式的时候，默认采用。

classDef default fill:#f9f,stroke:#333,stroke-width:4px;

示例：

graph LR
    classDef default fill:#f90,stroke:#555,stroke-width:4px;
    id1(Start)-->id2(Stop)

graph LR
classDef default fill:#f90,stroke:#555,stroke-width:4px;
id1(Start)-->id2(Stop)

序列图(sequence diagram)

示例：

sequenceDiagram
Alice->John: Hello John, how are you ?
John-->Alice:Great!
Alice->>John: dont borther me !
John-->>Alice:Great!
Alice-xJohn: wait!
John--xAlice: Ok!

sequenceDiagram
    Alice->John: Hello John, how are you ?
    John-->Alice:Great!
    Alice->>John: dont borther me !
    John-->>Alice:Great!
    Alice-xJohn: wait!
    John--xAlice: Ok!

如果想让 John 出现在前面，mermaid 通过设定参与者(participants)的顺序控制二者的顺序。上面的图可以做如下修改：

sequenceDiagram
　　participant John
　　participant Alice
　　Alice-xJohn:Hello John,how are you?
　　John-->>Alice:Great!

sequenceDiagram
　　participant John
　　participant Alice
　　Alice-xJohn:Hello John,how are you?
　　John-->>Alice:Great!

箭头的六种样式：

• ->
• –>
• ->>
• –>>
• -x
• –x

便签

给序列图增加便签：

具体规则：

[right of | left of | over][Actor]:Text

示例：

sequenceDiagram
　　participant John
　　Note left of John: Text in note

sequenceDiagram
　　participant John
　　Note left of John: Text in note

跨越两个 Actor 的便签：

sequenceDiagram
　　Alice->John:Hello John, how are you?
　　Note over Alice,John:A typical interaction

sequenceDiagram
　　Alice->John:Hello John, how are you?
　　Note over Alice,John:A typical interaction

循环 Loops

在序列图中，也可以使用循环，具体规则如下：

loop Loop text
... statements...
end

示例：

sequenceDiagram
　　Alice->>John: Hello!
　　loop Reply every minute
　　　　John->>Alice:Great!
　　end

sequenceDiagram
　　Alice->>John: Hello!
　　loop Reply every minute
　　　　John->>Alice:Great!
　　end

选择 ALT

在序列图中选择的表达。规则如下：

alt Describing text
...statements...
else
...statements...
end

或者使用 opt (推荐在没有 else 的情况下使用)

opt Describing text
...statements...
end

示例：

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
　　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

甘特图(gantt)

甘特图是一类条形图，由 Karol Adamiechi 在 1896 年提出, 而在 1910 年 Henry Gantt 也独立的提出了此种图形表示。通常用在对项目终端元素和总结元素的开始及完成时间进行的描述。

示例：

gantt
dateFormat YYYY-MM-DD

section S1
T1: 2014-01-01, 9d

section S2
T2: 2014-01-11, 9d

section S3
T3: 2014-01-02, 9d

gantt
dateFormat YYYY-MM-DD

section S1
T1: 2014-01-01, 9d

section S2
T2: 2014-01-11, 9d

section S3
T3: 2014-01-02, 9d

更加丰富的：

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

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

关于日期的格式可以参考：

• string-format
• Time-Formatting

范例

graph TB
    sq[Square shape] --> ci((Circle shape))

    subgraph A subgraph
        di{Diamond with  line break} -.-> ro(Rounded)
        di==>ro2(Rounded square shape)
    end

    e --> od3>Really long text with linebreak<br>in an Odd shape]

    cyr[Cyrillic]-->cyr2((Circle shape Начало));

    classDef green fill:#9f6,stroke:#333,stroke-width:2px;
    classDef orange fill:#f96,stroke:#333,stroke-width:4px;
    class sq,e green
    class di orange

graph TB
sq[Square shape] --> ci((Circle shape))

subgraph A subgraph
di{Diamond with line break} -.-> ro(Rounded)
di==>ro2(Rounded square shape)
end

e --> od3>Really long text with linebreak
in an Odd shape]

cyr[Cyrillic]-->cyr2((Circle shape Начало));

classDef green fill:#9f6,stroke:#333,stroke-width:2px;
classDef orange fill:#f96,stroke:#333,stroke-width:4px;
class sq,e green
class di orange

原文地址：https://www.cnblogs.com/q735613050/p/9368331.html