测试打印 lua 的 _G 所有显示的字段内容

-- jave.lin - tiny_testing.lua - 测试打印 lua 的 _G

--[=[
	local bit = require("bit")

	--local band, bor, bxor, tohex = bit.band, bit.bor, bit.bxor, bit.tohex
	--local brsh, blsh = bit.rshift, bit.lshift


	local a = 1
	local b = 3
	local c = 2
	local d = 16
	print("a & b : " .. bit.band(a, b))
	print("a | c : " .. bit.bor(a, c))
	print("a ^ b : " .. bit.bxor(a, b))
	print("tohex(d) : " .. bit.tohex(d))
	print("1