CommonFun.calcSkillMDamReduc
function CommonFun.calcSkillMDamReduc(srcUser, targetUser)
  if srcUser == nil or targetUser == nil then
    return 0
  end
  local SteelMDamReduc = targetUser:GetProperty("SteelMDamReduc")
  local ProtectMDamReduc = targetUser:GetProperty("ProtectMDamReduc")
  local HideMDamReduc = targetUser:GetProperty("HideMDamReduc")
  local DragonMDamReduc = targetUser:GetProperty("DragonMDamReduc")
  local WindMDamReduc = targetUser:GetProperty("WindMDamReduc")
  local DeadMDamReduc = targetUser:GetProperty("DeadMDamReduc")
  local SkillMDamReduc = (1 - SteelMDamReduc) * (1 - ProtectMDamReduc) * (1 - HideMDamReduc) * (1 - DragonMDamReduc) * (1 - WindMDamReduc) * (1 - DeadMDamReduc)
  if SkillMDamReduc <= 0.1 then
    SkillMDamReduc = 0.1
  end
  return SkillMDamReduc
end