public fw_TakeDamage(victim, inflictor, attacker, Float:damage, damage_type)
{
       if (victim==attacker)
              return HAM_IGNORED;

       if (!pev_valid(victim) || !pev_valid(attacker))
              return HAM_IGNORED;

       new classname[32]
       pev(victim,pev_classname,classname,31)
       if (equal(classname,"(你之前设的NPC名字)"))       //这里是检查被打的人是不是NPC
       {
              //看你要加啥都加在这边
              //有一点要注意 "非"玩家使用的指令不能加在这边 否则会有错误
              //例如 被攻击/攻击者是NPC 就不能使用 cs_get_user_team(victim) 或 cs_set_user_money(victim, ...)
              //当然 is_user_connected(回传玩家是否连接)这类的指令可以用
              //伤害的修改教学 可以看a78大的文章 http://bbs-mychat.com/reads.php?tid=829669
       }
       return HAM_IGNORED; 
}

#define DMG_HEGRENADE (1 << 24)       //感谢fouury提醒
new cache_bloodspray, cache_blood       //血的spr 等等会用到
public plugin_precache()
{
       //读取spr
       cache_blood = precache_model("sprites/blood.spr")
       cache_bloodspray = precache_model("sprites/bloodspray.spr")
}
public fw_TraceAttack(victim, attacker, Float:damage, Float:direction[3], tracehandle, damage_type)
{
       if (victim==attacker)
              return HAM_IGNORED;

       if (!pev_valid(victim) || pev_valid(attacker))
              return HAM_IGNORED;

       new classname[32]
       pev(victim,pev_classname,classname,31)
       if (equal(classname,"(你之前设的NPC名字)"))       //这里是检查被打的人是不是NPC
       {
              //注意事项跟上面一样
              //get_tr/set_tr这类指令可以使用 可用来判定伤害部位/喷血位置
              //下面会有范例(饭粒?
              new body = get_tr2(tracehandle,TR_iHitgroup) //取得NPC被伤害的部位
              if (body == 1)       //爆头的情况下
              {
                     damage *= 4.0       //伤害四倍
                     SetHamParamFloat(3, damage)       //读取修改过后的伤害
              }

              new Float:Fend[3],end[3]
              get_tr2(tracehandle, TR_vecEndPos, Fend)       //在开枪的位置和被击中的位置画条线(我不知道怎么解释..)

              //This message will draw blood sprites at the end of the trace
              if (!(damage_type & DMG_HEGRENADE))       //如果不是被芭乐炸的
              {
                     end[0] = floatround(Fend[0])
                     end[1] = floatround(Fend[1])
                     end[2] = floatround(Fend[2])
                     create_block_sprites(end)       //在该位置显示喷血(不会有血迹)
              }
       }     
       return HAM_IGNORED;
}

create_block_sprites(const origin[3])
{
       // Show some blood :)
       message_begin(MSG_BROADCAST, SVC_TEMPENTITY) 
       write_byte(TE_BLOODSPRITE)
       write_coord(origin[0])
       write_coord(origin[1])
       write_coord(origin[2])
       write_short(cache_bloodspray)
       write_short(cache_blood)
       write_byte(75)
       write_byte(5)
       message_end()
}

        * Description:              Usually called whenever an entity gets attacked by a hitscan (such as a gun) weapon.
        *                                   Use the get/set tr2 natives in fakemeta to handle the traceresult data.
        *                                   Do not use a handle of 0 as a traceresult in execution, use create_tr2() from Fakemeta
        *                                   to pass a custom handle instead.  (Don't forget to free the handle when you're done.)
        * Forward params:       function(this, idattacker, Float:damage, Float:direction[3], traceresult, damagebits)
        * Return type:              None.
        * Execute params:       ExecuteHam(Ham_TraceAttack, this, idattacker, Float:damage, Float:direction[3], tracehandle, damagebits);
        */
       Ham_TraceAttack,
       
       /**
        * Description:              Usually called whenever an entity takes any kind of damage.
        *                                   Inflictor is the entity that caused the damage (such as a gun).
        *                                   Attacker is the entity that tirggered the damage (such as the gun's owner).
        * Forward params:       function(this, idinflictor, idattacker, Float:damage, damagebits);
        * Return type:              Integer.
        * Execute params:       ExecuteHam(Ham_TakeDamage, this, idinflictor, idattacker, Float:damage, damagebits);
        */
       Ham_TakeDamage,