from friday.

for文の繰り返し処理をネストして二つのカウンタを作り、3行4列にMCを並べる。

var mcName:String;
var mc:MovieClip;
//4回繰り返す
for(var i:int=0; i<=3; i++) {
	//X座標
	var px:Number=110*i;
	//3回繰り返す
	for (var j:int=0; j<=2; j++) {
		//Y座標
		var py:Number=90*j;
		//写真番号
		var no:int=i*3+j+1;
		if (no<10) {
			mcName="mc0"+no+"_mc";
		} else {
			mcName="mc"+no+"_mc";
		}
		mc=this[mcName];
		mc.width=100;
		mc.height=80;
		mc.x=px+10;
		mc.y=py+10;
	}
}

as演算子はデータ型が一致したときに、評価したデータ型として値を返します。このことを利用して、MovieClipインスタンスのrootプロパティがDisplayObject型として取り出されるのを、as演算子を使ってMovieClip型に変換して代入するとエラーにならずに代入できます。

var myRoot:MovieClip = myMc.root as MovieClip;

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