Lua进阶(二)——函数环境、包

function foo()
   print(g or "No g defined!")
end
foo()
setfenv(foo, { g = 100, print = print }) --设置foo的环境为表{ g=100, ...}
foo()
print(g or "No g defined!")
--No g defined!
--100
--No g defined!

--mypack.lua:
module(..., package.seeall) --定义包
ver = "0.1 alpha"
function aFunInMyPack()
    print("Hello!")
end
_G.aFuncFromMyPack = aFunInMyPack

--testP.lua:
pack = require "mypack" --导入包
print(ver or "No ver defined!")
print(pack.ver)
print(aFunInMyPack or "No aFunInMyPack defined!")
pack.aFunInMyPack()
print(aFuncFromMyPack or "No aFuncFromMyPack defined!")
aFuncFromMyPack()

--执行testP.lua结果
No ver defined!
0.1 alpha
No aFunInMyPack defined!
Hello!
function: 0068CB50
Hello!