【进阶实战】Lua槽位唯一：裁决之杖穿戴的部位约束

local function wear(actor, item)
    setplayvar(actor, item.slot .. "_ON", item.id)  -- 直接覆盖，旧件消失
end

local function wear(actor, item)
    local key = item.slot .. "_ON"
    local old = getplayvar(actor, key)
    if old and old ~= "" then
        giveitem(actor, old, 1, 0, "卸下返还")   -- 先卸旧件
    end
    setplayvar(actor, key, item.id)
    sendmsg(actor, 1, "裁决之杖穿戴成功，旧件已回背包")
end