print ("2"+6) print ("1"+"8") print ("abc" .. "def") print (123 .. 456) print("\n") len ="www.baidu.com" print (#len) print (#"Linux") print("\n") --创建一个空table local tb1 ={} --直接初始化table local tb2 ={"a","b","c"} a ={} a["key"]="value" key =10; a[key]=22 a[key]= a[key]+11 for k,v in pairs(a) do print (k .. ":" .. v) end print("\n") --lua Table的索引一般以1开始而不是0 local tbl = {"apple", "pear", "orange", "grape"} for key, val in pairs(tbl) do print("Key", key) end print("\n") --table 不会固定长度大小，有新数据添加时 table 长度会自动增长，没初始的 table 都是 nil a3 = {} for i = 1, 10 do a3[i] = i end a3["key"] = "val" print(a3["key"]) print(a3["none"]) --在 Lua 中，函数是被看作是"第一类值（First-Class Value）"，函数可以存在变量里 print("\n") function factorial1(n) if n == 0 then return 1 else return n * factorial1(n - 1) end end print(factorial1(5)) factorial2 = factorial1 print(factorial2(5)) --function 可以以匿名函数（anonymous function）的方式通过参数传递: print("\n") function anonymous(tab, fun) for k, v in pairs(tab) do print(fun(k, v)) end end tab = { key1 = "val1", key2 = "val2" } anonymous(tab, function(key, val) return key .. " = " .. val end)