cocos2dx tolua传递参数分析：
tolua_Cocos2d_CCNode_addChild00  == void CCNode::addChild(CCNode *child)
tolua_Cocos2d_CCNode_addChild01  == void CCNode::addChild(CCNode *child,int zOrder)
tolua_Cocos2d_CCNode_addChild02  == void CCNode::addChild(CCNode *child,int zOrder,int tag)

上面是使用tolua把C++转到lua，上面三个分别对应不同的参数个数。我们这里分析一下最后一个：
/* method: addChild of class  CCNode */
#ifndef TOLUA_DISABLE_tolua_Cocos2d_CCNode_addChild02
static int tolua_Cocos2d_CCNode_addChild02(lua_State* tolua_S)
{
 tolua_Error tolua_err;
 //这里判断参数是否合法，只能判断参数类型是否合法，如果参数类型检查不通过，就会报错
 if (
     !tolua_isusertype(tolua_S,1,"CCNode",&tolua_err) ||
     !tolua_isusertype(tolua_S,2,&tolua_err) ||
     !tolua_isnumber(tolua_S,3,4,&tolua_err) ||
     !tolua_isnoobj(tolua_S,5,&tolua_err)
 )
  goto tolua_lerror;
 else
 {
  //例如：middleBg:addChild(testSprite,Z_ORDER_1,200)
  //我们传递进来的参数和下面的一一对应
  //这里可以清楚的看到传入参数的次序，第一是middleBg ...
  CCNode* self = (CCNode*)  tolua_tousertype(tolua_S,0);    --  middleBg   -- 1
  CCNode* child = ((CCNode*)  tolua_tousertype(tolua_S,0)); --  testSprite -- 2
  int zOrder = ((int)  tolua_tonumber(tolua_S,0));          --  Z_ORDER_1  -- 3
  int tag = ((int)  tolua_tonumber(tolua_S,0));             --  200        -- 4
#ifndef TOLUA_RELEASE
  if (!self) tolua_error(tolua_S,"invalid 'self' in function 'addChild'",NULL);
#endif
  {
   //这里就把testSprite加到了middleBg
   self->addChild(child,zOrder,tag);
  }
 }
 return 0;
tolua_lerror:
 return tolua_Cocos2d_CCNode_addChild01(tolua_S);
}
#endif //#ifndef TOLUA_DISABLE

例子：
//middleBg:addChild(testSprite,200) 在传递参数中，我们没有对Z_ORDER_1赋值，即为nil，则就
//出现了下面的错误，看下这里argument #3 ，表明是第三个参数错误，而这里我们明明是第二个参数，看下上面的分析
//我想大家应该明白了，通过这种方法，我们以后查找这类问题，就会方便很多。
03-31 10:09:50.499: D/cocos2d-x debug info(3169): LUA ERROR: [string "xxxxxxxxxxxxx..."]:171: error in function 'addChild'.
03-31 10:09:50.499: D/cocos2d-x debug info(3169):      argument #3 is 'nil'; '[no object]' expected.
03-31 10:09:50.499: D/cocos2d-x debug info(3169): stack traceback:
03-31 10:09:50.499: D/cocos2d-x debug info(3169): 	[C]: in function 'addChild'
03-31 10:09:50.499: D/cocos2d-x debug info(3169): 	[string "xxxxxxxxxxxxx..."]:171: in function 'initMiddle'
03-31 10:09:50.499: D/cocos2d-x debug info(3169): 	[string "xxxxxxxxxxxxx..."]:35: in function 'initUI'
03-31 10:09:50.499: D/cocos2d-x debug info(3169): 	[string "xxxxxxxxxxxxx..."]:27: in function 'ctor'
03-31 10:09:50.499: D/cocos2d-x debug info(3169): 	[string "xxxxxxxxxxxxx"]:34: in function 'create'
03-31 10:09:50.499: D/cocos2d-x debug info(3169): 	[string "xxxxxxxxxxxxx"]:38: in function 'new'
03-31 10:09:50.499: D/cocos2d-x debug info(3169): 	[string "xxxxxxxxxxxxx"]:44: in function 'pushScene'
03-31 10:09:50.499: D/cocos2d-x debug info(3169): 	[string "xxxxxxxxxxxxx"]:309: in function 'callBack'
03-31 10:09:50.499: D/cocos2d-x debug info(3169): 	[string "xxxxxxxxxxxxx"]:653: in function <[string "xxxxxxxxxxxxx"]:651>