如何设置可以使一个技能必须消耗掉某物品才能使用 - Project1

#==============================================================================
# 消耗物品的技能。格式：技能ID => [物品ID, 物品数量]
CONSUME_ITEM_SKILLS = {57=>[9,1]}
class Game_Battler
#--------------------------------------------------------------------------
alias add_skill_can_use? skill_can_use?
def skill_can_use?(skill_id)
if CONSUME_ITEM_SKILLS.keys.include?(skill_id)
id = CONSUME_ITEM_SKILLS[skill_id][0]
if $game_party.item_number(id) < CONSUME_ITEM_SKILLS[skill_id][1]
return false
end
end
add_skill_can_use?(skill_id)
end
#--------------------------------------------------------------------------
alias add_skill_effect_xdrs skill_effect
def skill_effect(user, skill)
if CONSUME_ITEM_SKILLS.keys.include?(skill.id) and user.is_a?(Game_Actor)
id = CONSUME_ITEM_SKILLS[skill.id][0]
$game_party.lose_item(id, CONSUME_ITEM_SKILLS[skill.id][1])
end
add_skill_effect_xdrs(user, skill)
end
end
#===============================================================================

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