import flash.display.Sprite;
import flash.geom.Point;

var container:Sprite = new Sprite();

var square1:Sprite = new Sprite();
square1.graphics.beginFill(0xFFCC00);
square1.graphics.drawRect(0, 0, 40, 40);

var square2:Sprite = new Sprite();
square2.graphics.beginFill(0x00CCFF);
square2.graphics.drawRect(20, 0, 30, 40);

container.addChild(square1);
container.addChild(square2);

var pt:Point = new Point(10, 20);
var objects:Array = container.getObjectsUnderPoint(pt); 
trace(objects.length); // 1

pt = new Point(35, 20);
objects = container.getObjectsUnderPoint(pt);
trace(objects.length);  // 2

获得当前Point下面的DisplayObject数组

getObjectsUnderPoint

ActionScript 3