Lua 4 最外层变量作用域
Lua 4 outermost variable scope
我是否应该在 a 的最外层范围内显式声明一个变量 Lua 4 脚本 a
局部变量还是全局变量？我应该避免其中一个吗？谢谢
例如：
local foo = 5
对比
faa = 8
相信你已经知道local变量是只存在于一定范围内的变量，而普通变量是global，属于_G[=21] =].然而，根据 Lua's Performance Guide，它也有助于使您的代码更快：
Lua precompiler is able to store all local variables in registers. The result is that access to local variables is very fast in Lua. For instance, if a and b are local variables, a Lua statement like a = a + b generates one single instruction.
So, it is easy to justify one of the most important rules to improve the performance of Lua programs: use locals!
我是否应该在 a 的最外层范围内显式声明一个变量 Lua 4 脚本 a 局部变量还是全局变量？我应该避免其中一个吗？谢谢
例如：
local foo = 5
对比
faa = 8
相信你已经知道local变量是只存在于一定范围内的变量，而普通变量是global，属于_G[=21] =].然而，根据 Lua's Performance Guide，它也有助于使您的代码更快：
Lua precompiler is able to store all local variables in registers. The result is that access to local variables is very fast in Lua. For instance, if
aandbare local variables, a Lua statement likea = a + bgenerates one single instruction.
So, it is easy to justify one of the most important rules to improve the performance of Lua programs: use locals!