jiexian_yicong = sgs.CreateDistanceSkill{
name = "jiexian_yicong" ,
correct_func = function(self, from, to)
local correct = 0
if from:hasSkill(self:objectName()) and (from:getHp() > 2) then
correct = correct - 1
end
if to:hasSkill(self:objectName()) and (to:getHp() <= 2) then
correct = correct + 1
end
return correct
end
}

终于完成了，最终版，感谢帮助
jiexian_yicongyx = sgs.CreateTriggerSkill{
name = "#jiexian_yicong",
events = {sgs.HpRecover, sgs.PostHpReduced},
on_trigger = function(self, event, player, data)
local room = player:getRoom()
local hp = player:getHp()
if event == sgs.HpRecover and (hp == 3) then
room:broadcastSkillInvoke("jiexian_yicong",1)
end
if event == sgs.PostHpReduced and (hp == 2) then
room:broadcastSkillInvoke("jiexian_yicong",2)
end
end
}

jiexian_yicongyx = sgs.CreateTriggerSkill{
name = "#jiexian_yicong",
events = {sgs.HpRecover, sgs.PostHpReduced},
on_trigger = function(self, event, player, data)
local room = player:getRoom()
local hp = player:getHp()
if event == sgs.HpRecover then
local recover = data:toRecover()
if (hp > 2) and (hp - recover.recover) <=2 then
room:broadcastSkillInvoke("jiexian_yicong",1)
end
end
if event == sgs.PostHpReduced then
local damage = data:toDamage()
if (hp <= 2) and (hp + damage.damage) > 2 then
room:broadcastSkillInvoke("jiexian_yicong",2)
end
end
end
}