转载
张三->李四: 嘿，小四儿, 写博客了没?
Note right of 李四: 李四愣了一下，说：
李四-->张三: 忙得吐血，哪有时间写。
st=>start: 开始
e=>end: 结束
op=>operation: 我的操作
cond=>condition: 确认？
st->op->cond
cond(yes)->e
cond(no)->op
st=>start: Start|past:>http://www.google.com[blank]
e=>end: End:>http://www.google.com
op1=>operation: My Operation|past
op2=>operation: Stuff|current
sub1=>subroutine: My Subroutine|invalid
cond=>condition: Yes
or No?|approved:>http://www.baidu.com
c2=>condition: Good idea|rejected
io=>inputoutput: catch something...|request
st->op1(right)->cond
cond(yes, right)->c2
cond(no)->sub1(left)->op1
c2(yes)->io->e
c2(no)->op2->e
