-- create a class
Animal={name = "no_name" , age=0 }
function Animal:bark(voice)
print(self.name.."in"..voice.."jiao")
end
function Animal:new()
a={}
setmetatable(a,{__index=self})
return a
end
animal = Animal:new()
animal2=Animal:new()
-- print(animal)
-- print(animal2)
animal.name = "Tom"
animal.age = 8
animal.type = "cat"
print(animal.name.."jn"..animal.age)
function animal2:skill()
return "mouse"
end
print(animal2.name.."jn"..animal.age..animal2:skill())
function Animal:new (obj)
local a=obj or {}
setmetatable(a,{__index=self})
return a
end
Cat =Animal:new({type="bosiCat"})
Cat.eye="blue eye"
tomcat =Cat:new()
tomcat.name="Tome"
print(tomcat.name.."is".."d"..tomcat.type)
运行结果:
Lua协同线程
lua中有一种特色的线程,称为coroutine,协同线程,简称协程。其可以在运行时暂停执行,然后转去执行其他线程,然后还可以返回再继续执行没有完毕的内容。即可以“走走停停,停停走走”
在lua中表示独立的执行线程。任意时刻只会有一个协程执行,而不会出现多个协程同时执行的情况。
-- create thread
crt=coroutine.create(
function(a,b)
print(a,b,a+b)
-- obtain running thread
tr=coroutine.running();
print(tr)
-- check type
print(type(tr))
-- check crt status
print(coroutine.status(crt))
-- coroutine pending
coroutine.yield()
print("back")
end
)
-- start coroutine a=3,b=5
coroutine.resume(crt,3,5)
-- check crt type
print("main-"..type(crt))
-- check crt status
print("main-"..coroutine.status(crt))
-- cancel panding math is not imporitance
coroutine.resume(crt,3,5)
-- check crt status
print("main-"..coroutine.status(crt))
运行结果:
有返回值的协同线程
--create
crt=coroutine.create(
function(a,b)
print(a,b)
c=a*b
print(c)
coroutine.yield(c,a/b)
return a+b,a-b
-- print("back")
end
)
result,result1,result2 = coroutine.resume(crt,4,7)
print(result,reslut1,result2)
协同函数:
cf= coroutine.wrap(
function(a,b)
print(a,b)
return a+b,a*b
end
)
success,result1,result2=cf(3,4)
结果:
Lua的IO
file= io.open("t1.lua","r")
io.input(file)
line=io.read()
print("hi")
while line ~= nil do
print(line)
line=io.read("*1")
end
io.close(file)
File操作
file= io.open("t1.lua","a")
file:write("\nlevel=p7")
file:close()
结果: