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lua语言--table的构建

  table是lua语言中最为重要,也是最为强大的武器,最简单的构造函数是{}。--所以说当你看到{}的时候,实际上是调用了一个构造函数。

  直接初始化数组:

days = {"Monday","Tuesday","Wednesday"}

  初始化一个表作为record:

days = {m = "Monday",t = "Tuesday",w="Wednesday"}
//注意record其实相当于以m,t,w作为下表,所以默认的下表days[0]返回nil

  添加域:可以向表中添加任何类型的域,构造函数{}仅影响初始化。

w = {x = 0,y = 0,label="console"}
x = {sin(0),sin(1),sin(2)}
w[1] = "another field"
x.f = w
//域即键值

  用table构造链表:

list = nil
for line in io.lines() do
    list = {next = list,value =http://www.mamicode.com/ line}
end

l = list 
while 1 do 
    print(l.value)
    l = l.next
end

  record和list混搭:

polyline = {color = "blue",thickness = 2,npoints = 4,
			{x = 0, y = 0},
			{x = -10, y = 0},
			{x = -10, y = 1},
			{x= 0, y = 1}
		}

print(polyline[1].x)

  list和record风格是一般初始化的特例:

{x=0,y=0}    <-->  {["x"]=0,["y"]=0}
{"red","green","blue"}   <--> {[1] = "red",[2] = "green",[3] = "blue"}

  如果想要数组从0开始:(不建议)

days = {[0] = "Sunday","Monday","Tuesday","Wednesday"}

  构造函数的,是可选的,方便以后扩展/ ,和;可以相互替代。  

lua语言--table的构建