■ 配列を使うには

onClipEvent (enterFrame) {
charX = [10, 60, 99, 130, 170, 200, 220];
charY = [30, 120, 50, 180, 130, 70, 150];
n = Math.floor(Math.random()*charX.length);
this._x = charX[n];
this._y = charY[n];
}