Lua中..和#运算符的用法
样例
试试以下的样例就明确了在Lua编程语言提供的其它运算符：
a = "Hello "
b = "World"
print("Concatenation of string a with b is ", a..b )
print("Length of b is ",#b )
print("Length of b is ",#"Test" )
当建立并运行上面的程序它会产生下面结果
Concatenation of string a with b is Hello World Length of b is 5 Length of b is 4
原文：http://www.cnblogs.com/brucemengbm/p/7162040.html