好先生的大结局:谁懂flash里的这段AS,帮我解释一下是什么意思？

znum = 0; //初始化znum变量
this.img2.setMask(this.mov); //设置this.mov为tis.img2的影片剪辑
allz = new Array(); //声明一个数组，以下为数组初始化部分
allz[0] = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38];
allz[1] = [38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1];
allz[2] = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38];
allz[3] = [38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1];
allz[4] = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38];
allz[5] = [38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1];
allz[6] = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38];
allz[7] = [38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1];
allz[8] = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38];
allz[9] = [38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1];
allz[10] = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38];
allz[11] = [38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1];
for (i = 0; i < 39; i++) //调用数组的循环
{
for (j = 0; j < 12; j++) //调用数组的循环
{
this.mov.nemo.duplicateMovieClip("m" + (i - 1) * 35 + j, (i - 1) * 35 + j); //在this.mov.memo上创建影片剪辑的实例，"m" + (i - 1) * 35 + j表达式的值为要复制的影片剪辑的目标路径或是对影片剪辑实例的直接引用，(i - 1) * 35 + j表达式的值为复制的影片剪辑的唯一标识符
this.mov["m" + (i - 1) * 35 + j].xnum = i; //为xnum赋值
this.mov["m" + (i - 1) * 35 + j].ynum = j; //为ynum赋值
this.mov["m" + (i - 1) * 35 + j]._x = i * 20 + 30; //设定this.mov["m" + (i - 1) * 35 + j] X坐标
this.mov["m" + (i - 1) * 35 + j]._y = j * 20 + 20; //设定this.mov["m" + (i - 1) * 35 + j] Y坐标
this.mov["m" + (i - 1) * 35 + j].onEnterFrame = function () //以 SWF 文件的帧频重复调用。分配给 onEnterFrame 事件处理函数的函数将在附加到受影响的帧上的所有 ActionScript 代码之前处理。
{
if (_root.allz[this.ynum][this.xnum] == _root.znum) 如果数组值与root.znum相同，则播放此剪辑
{
this.play();
} // end if
};
} // end of for
} // end of for
this.onEnterFrame = function () //同上
{
if (znum < 40) //如果znum小于40，则znum递加
{
this.znum++;
} // end if
};