The usage of lua language and ..

1. lua language

Lua is a lightweight and compact scripting language written in standard C language and open in the form of source code. It is designed to be embedded in applications to provide flexible expansion and customization functions for applications.       

2. Learning website

reference:

https://wiki.openluat.com/

https://www.runoob.com/lua/lua-basic-syntax.html

Lua online running tool: https://chenxuuu.gitee.io/lua-online/?print%28%22hello%20world%21%22%29

3. Example

Usage of the symbol .. (2.)

print("hello")
local s="" 
local s1="123"
s=s..s1
print(s)
local s2="321"
s=s..s2
print(s)
--运行结果
--hello
--123
--123321
--注意..的用法，作用追加字符（串）到末尾

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