Lua编程（四） Lua标准库：表库、字符串库、系统库

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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>bendtable.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()dolocal x = os.clock()local s = 0for i=1,100000000 do s= s+i endprint(string.format("the passed time is %.2f\n",os.clock()-x))ends = "hello world"i, j = string.find(s, "hello")print(i, j)        --> 1    5print(string.sub(s, i, j))    --> helloprint(string.find(s, "world"))   --> 7    11i, j = string.find(s, "l")print(i, j)        --> 3    3print(string.find(s, "lll"))   --> nils = 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 , gammealphalog88.99gamme3423 , alpha , loglog , alpha , 342304welwelcomewel11/24/11 17:55:44the passed time is 2.1215hello71133nilLua makes superLuX mXkes superLua mXkes super

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