在lua中“#”表示返回表长度或字符串长度

例子一：

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" )

结果：

Concatenation of string a with b is  Hello World  Length of b is  5  Length of b is  4

 

例子二,对多维表的计算：

th> tags={

{1,2,3},{3,4,4}}

th> #tags

2

 

例子三，

th> tags={
   1,2,3}                                                                      [0.0001s]th> tags[#tags+1]=4                                                                      [0.0001s]th> tags{  1 : 1  2 : 2  3 : 3  4 : 4}