使用序列图

st=>start: Start:>http://www.google.com[blank]
e=>end:>http://www.google.com
op1=>operation: My Operation
sub1=>subroutine: My Subroutine
cond=>condition: Yes
or No?:>http://www.google.com
io=>inputoutput: catch something...

st->op1->cond
cond(yes)->io->e
cond(no)->sub1(right)->op1

Andrew->China: Says Hello
Note right of China: China thinks about it
China-->Andrew: How are you?
Andrew->>China: I am good thanks!