装备锁定重随：锁定一条词条重随其余属性

local function rerollBad(name)
    local p = getplayerbyname(name)
    setplayvar(p, "GOLD", getplayvar(p, "GOLD") - 10)
    -- 全部词条一起重随，锁不住任何一条
end

local LOCK_COST = {10, 20, 40}
local function reroll(name, lockIdx)
    local p = getplayerbyname(name)
    local n = (getplayvar(p, "lockN") or 0) + 1
    local cost = LOCK_COST[math.min(n, 3)]
    if getplayvar(p, "GOLD") < cost then
        sendmsg(p, 1, "金锭不足，需 " .. cost)
        return
    end
    setplayvar(p, "GOLD", getplayvar(p, "GOLD") - cost)
    setplayvar(p, "lockN", n)
    sendmsg(p, 1, "保留第 " .. lockIdx .. " 条，其余已重随")
end