配置

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!

语法

```mermaid

```

示例