How to calculate taken dmg by trigger

[jareph]

help ~
How to calculate taken dmg by trigger
Example
when unit A attack unit B
unit B is taken dmg
any event and action that can calculate the dmg
i nid to save the dmg to a variable

 

[Dr Super Good]

Yes, the single unit event of your unit takes damage.
You can then get the damage via the one real opperation.

 

[jareph]

ah sry~
forget to say
i need the trigger for general
my unit is not put in map initially.
and i need the trigger in GUI
my map got many unit need to use the trigger*