MarkDown

这是一个测试文章

hello world!

  sequenceDiagram
  Alice->>John: Hello John, how are you?
  loop Healthcheck
  John->>John: Fight against hypochondria
  end
  Note right of John: Rational thoughts!
  John-->>Alice: Great!
  John->>Bob: How about you?
  Bob-->>John: Jolly good!