绘制流程图 Flowchart
[mermaid]
st=>start: 用户登陆
op=>operation: 登陆操作
cond=>condition: 登陆成功 Yes or No?
e=>end: 进入后台
st->op->cond
cond(yes)->e
cond(no)->op
[/mermaid]
绘制序列图 Sequence Diagram
Andrew->China: Says Hello
Note right of China: China thinks\nabout it
China-->Andrew: How are you?
Andrew->>China: I am good thanks!