有没有记载`require`在全局环境中运行块? [英] Is it ever documented that `require` runs chunks in the global env?

问题描述

编写模块时，文件在全局环境中运行，而不是在调用环境中运行:

When you write a module, the file is run in the global environment, not the calling environment:

-- other_file.lua
require('my_file')

-- my_file.lua
getfenv(2) == getfenv(0)   -- true
setfenv(1, {})             -- or module(...)
getfenv(2) == getfenv(0)   -- true

我永远都不记得读过这本书.是否在任何地方提到/记录了?

I don't ever remember reading about this. Is it mentioned/documented anywhere?

(此问题更多地是关于require而不是getfenv.我知道它已在5.2中删除.)

(This question is more about require rather than getfenv. I know it's removed in 5.2.)

推荐答案

它没有明确记录，但是在没有任何确切说明的情况下，您应该假定它像Lua的其余部分一样工作，即使用全局环境.

It is not explicitly documented but in the absence of any precise statement you should assume that it works like the rest of Lua, that is, using the global environment.

dofile还在全局环境中而不是在调用环境中运行文件.换句话说，dofile与include不同，而Lua没有.

dofile also runs the file in the global environment, not in the calling environment. In other words, dofile is not the same as include, which Lua does not have.

require本质上是dofile的一个版本，它支持路径并缓存加载的文件.因此，它还在全局环境中而不是在调用环境中运行文件.

require is essentially a version of dofile that supports paths and caches loaded files. So, it also runs the file in the global environment, not in the calling environment.

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