Lua Encapsulation class--lua and Android

The Lua wrapper class (in object-oriented parlance) has three ways of writing:

Way One

Lib = {}lib.name = Nillib.foo = function (x, y) return x + y Endlib.goo = function (x, y) return-X-y End

Way two:

Lib = {    = Nil,    return x + y end,    return x- y end,}

Way three:

Lib == nilfunction lib.foo (x, y)return x + yendfunction lib.goo (x, y)  Return X- yend

Authentication (Coronacard in Android):

------------------------------------------------------------------------------- DoStart and fill screenprint ("Start Lua ...") Mbackground= Display.newrect (0,0,2* Display.contentwidth,2*display.contentheight)--------------------------------------------------------------------------------------------------------------- ---------------------------------------------define Liblib={}lib.name=Nillib.foo= function (x, y)returnX +y Endlib.goo= function (x, y)returnX-y End-----------------------------------------------------------------------------Local Liba=Libliba.name="test Lib at 1"Local I,j=Ten, -;p rint (liba.name ."--".. Liba.foo (i, J)) Liba.name="test Lib at 2"print (Liba.name ."--".. Liba.goo (I,J))

Lua Encapsulation class--lua and Android