@startuml
title 各种箭头
/'
• add a final x to denote a lost message
• use or / instead of < or > to have only the bottom or top part of the arrow
• repeat the arrow head (for example, >> or //) head to have a thin drawing
• use -- instead of - to have a dotted arrow
• add a final ”o” at arrow head
• use bidirectional arrow
'/
actor Bob as B
actor Alice as A
B ->x A
B -> A
B ->> A
B - A
B \- A
B //--A
B ->o A
B o\--A
B <-> A
B <->o A
@enduml