Lua编程示例（四）：Lua标准库之表库、字符串库、系统库

tb1 = { "alpha","log","gamme"}

print(table.concat(tb1," , "))
print(table.concat(tb1,"\n",nil,2))
print()

tb1[88.99] = 'aaa'
--返回索引值最大的值，并且计算小数
print(table.maxn(tb1))
print()

--默认删除索引最大的元素并返回
print(table.remove(tb1))
print()

table.insert(tb1,'3423')
table.sort(tb1)
print(table.concat(tb1," , "))
function sortfunc(a,b)
 return a>b
end
table.sort(tb1,sortfunc)
print(table.concat(tb1," , "))
print()

print(string.len(""))
print(string.len("abcd"))
print(string.sub("welcome",1,3))
print(string.sub("welcome",1,-1))
print(string.sub("welcome",1,-5))
print()

print(os.date())
print()

do
 local x = os.clock()
 local s = 0
 for i=1,100000000 do s= s+i end
 print(string.format("the passed time is %.2f\n",os.clock()-x))
end

s = "hello world"
i, j = string.find(s, "hello")
print(i, j)    --> 1  5
print(string.sub(s, i, j))  --> hello
print(string.find(s, "world"))  --> 7  11
i, j = string.find(s, "l")
print(i, j)    --> 3  3
print(string.find(s, "lll"))  --> nil

s = string.gsub("lua is super", "is","makes")
print(s)
s = string.gsub(s,"a","x")
print(s)
s = string.gsub(s,"x","a",1)
print(s)

运行结果：

alpha , log , gamme
alpha
log

88.99

gamme

3423 , alpha , log
log , alpha , 3423

0
4
wel
welcome
wel

11/24/11 17:55:44

the passed time is 2.12

1 5
hello
7 11
3 3
nil
lua makes super
lux mxkes super
lua mxkes super