lua中rawset/rawget

rawget是为了绕过__index而出现的，直接点，就是让__index方法的重写无效。(我这里用到"重写"二字，可能不太对，希望能得到纠正)

Window = {}

Window.prototype = {x = 0,y = 0,width = 100,height = 100,}
Window.mt = {}
function Window.new(o)
	setmetatable(o,Window.mt)
	return o
end
Window.mt.__index = function (t,key)
	return 1000
end
Window.mt.__newindex = function (table,key,value)
	if key == "wangbin" then
		rawset(table,"wangbin","yes,i am")
	end
end
w = Window.new{x = 10,y = 20}
print(rawget(w,w.wangbin))

但是rawset呢，起什么作用呢?我们再来运行一段代码。

Window = {}
Window.prototype = {x = 0,value)
	table.key = "yes,i am"
end
w = Window.new{x = 10,y = 20}
w.wangbin = "55"