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[AS3] 我是菜鸟,请各位高手指点迷津!!帮我解释一下这段代码的意思

this.createEmptyMovieClip("images", 100);
this.attachMovie("mask", "mask", 101);
mask._x = images._x =-68;
mask._y = target = -150;
images._y = -1000;
images.setMask(mask);
speed = 5;
for (var i = 0; i<8; i++) {
       var img = images.attachMovie("image"+i, "image"+i, i);
       img._y = img._height*i;
       var thumb = this["thumb"+i];
       thumb._alpha = 60;
       thumb.pos = target+(i*-img._height);
       thumb.onPress = function() {
              target = this.pos;
       };
       thumb.onRollOver = function() {
              this._alpha = 100;
       };
       thumb.onRollOut = function() {
              this._alpha = 60;
       };
}
this.onEnterFrame = function() {
       images._y += (target-images._y)/speed;
};
一个点击小图,得到大图的效果
http://www.flash023.cn 终极讨厌
这里不是3.0吗。。
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