Lua表格转储：递归打印的调试利器

-- 错误：tostring 一张表只得地址
print(cfg)

local seen = {}
local function dump(t, indent)
    indent = indent or 0
    for k, v in pairs(t) do
        local pad = string.rep("  ", indent)
        if type(v) == "table" then
            if seen[v] then
                print(pad .. k .. " = <循环>")
            else
                seen[v] = true
                print(pad .. k .. " = {")
                dump(v, indent + 1)
            end
        else
            print(pad .. k .. " = " .. tostring(v))
        end
    end
end