Lua 整理数据

local zfmt = {}

function zfmt.str(data, default)
    if (default ==  nil) then default = '' end
    return (tostring(data) or default)
end

function zfmt.num(data, default)
    if (default == nil) then default = 0 end
    return (tonumber(data) or default)
end

return zfmt

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