--濒死时，可以恢复2点体力，并获得技能B
A = sgs.CreateTriggerSkill{
name = "A",
frequency = sgs.Skill_Wake,
events = {sgs.Dying},
on_trigger = function(self, event, player, data)
local room = player:getRoom()
local recover = sgs.RecoverStruct()
recover.reason = "A"
recover.who = player
recover.recover =2
room:recover(player, recover)
room:acquireSkill(player,"B")--这个获取技能B——技能B不存在就生出来
end
}