如何在运行时检测是否正在运行Luajit或PUC Lua 5.1? [英] How can I detect at runtime if I am running Luajit or PUC Lua 5.1?

问题描述

我正在为我的Lua项目编写一些测试脚本，并且我想确保它们可以在可用的不同Lua版本下正确运行.由于我的单元测试框架配置不当会使用错误的Lua版本，因此我想特别安全，并在运行时检查测试运行的Lua版本.最好的方法是什么?

I am writing some test scripts for my Lua project and I want to be sure that they run correctly under the different Lua versions available. Since my unit testing framework can use the wrong Lua version if I misconfigure it, I would like to be extra safe and check at runtime what Lua version my tests are running under. What would be the best way to do that?

我知道区分5.1和5.2的一种快速方法是检查_VERSION全局值，但是如何区分常规的Lua 5.1和LuaJIT?

I know that a quick way to tell 5.1 and 5.2 apart is to check the _VERSION global but how can I tell regular Lua 5.1 and LuaJIT apart?

推荐答案

Luajit用jit模块扩展了标准库.这可能是检测其存在的更直接的方法:

Luajit extends the standard library with a jit module. That is probably a more direct way to detect its presence:

if type(jit) == 'table' then
   print(jit.version)  --LuaJIT 2.0.2
end

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