mermaid之序列图

mermaid中的序列图

1. 句法规则

1. 参与者：

   隐式定义：角色的顺序按照定义顺序呈现

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

   Alice John Hello john,how are you? Great! Alice John

   也可以显式的定义角色的顺序

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

   John Alice Hello John, how are you? Great! John Alice

2. 别名：可以为角色定义别名（别名在前）

   sequenceDiagram
   participant J as John
   participant A as Alice
   A ->> J: Hello John, how are you?
   J -->> A: Great!

   John Alice Hello John, how are you? Great! John Alice

2. 消息

1. 目前支持六种类型的箭头：

   类型	描述
   ->	无箭头实线
   –>	无箭头虚线
   ->>	带箭头实线
   –>>	带箭头虚线
   -X(或x)	带箭头实线末端有×
   –X(或x)	带箭头虚线末端有×

3. 激活

1. 角色可以选择激活或停用，可以以专用声明决定是否激活

   sequenceDiagram
   Alice ->> John : Hello John, how are you?
   activate John
   John -->> Alice: Great!
   deactivate John

   Alice John Hello John, how are you? Great! Alice John

2. 还可以在箭头上附加+/-作为快捷表示方法

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

   Alice John Hello John, how are you? Great! Alice John

3. 同一个角色可以多次激活

   sequenceDiagram
   Alice ->>+ John: Hello John, how are you?
   Alice ->>+ John: John, can you hear me?
   John -->>- Alice: Hi Alice, I can hear you!
   John -->>- Alice: I feel great!

   Alice John Hello John, how are you? John, can you hear me? Hi Alice, I can hear you! I feel great! Alice John

4. 注释

1. 序列图可以添加注释，格式为：N(n)ote [right of | left of | over][Actor]

   sequenceDiagram
   participant John
   Note right of John: Text in note

   John Text in note John

2. 也可以创建跨越两个角色的笔记

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

   Alice John Hello John, how are you? A typical interaction Alice John

5. 循环

1. 可以在序列图中实现用符号表示的循环

   loop Loop-text

   示例：

   sequenceDiagram
   Alice->John: Hello John, how are you?
   loop Every minute
   John–>Alice: Great!
   end

   Alice John Hello John, how are you? Great! loop [ Every minute ] Alice John

6. 备选路径

1. 可以在序列图中实现用符号表示的备选路径

   alt Describing text
   … statements …
   else
   … statements …
   end

   或者如果还有序列是可选的

   opt Describing-text
   … statements …
   end

   示例：

   Alice Bob Hello Bob, how are you? Not so good :( Feeling fresh like a daisy alt [ is sick ] [ is well ] Thanks for asking opt [ Extra response ] Alice Bob

7. CSS样式

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8. 组态

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