所以，我有这个代码：
public function hitTest1(e:Event) : void
{
if (hitTestObject(target.hit)){
gotoAndStop(2,"Scene 1");
removeEventListener(Event.ENTER_FRAME, hitTest1);
}
}
其中 target 是要被击中的对象，而 hit 是所述对象上方的层中的符号。当我运行代码时，我再次遇到此错误。
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at com.Mass.basics1::Asteroid/hitTest1()
注意：Asteroid 是包含所有这些代码的 .as 文件。
以下是其余代码供参考：
package com.Mass.basics1
{
import flash.display.MovieClip;
import flash.display.Stage;
import flash.events.Event;
public class Asteroid extends MovieClip
{
public var target:Cosmo;
private var stageRef:Stage;
private var speed:Number;
// public var ourAsteroid:Asteroid = new Asteroid(stage);
public function Asteroid(stageRef:Stage)
{
this.stageRef = stageRef;
setupAsteroid(true);
addEventListener(Event.ENTER_FRAME, loop, false, 0, true);
addEventListener(Event.ENTER_FRAME, hitTest1);
}
public function hitTest1(e:Event):void
{
if (hitTestObject(target.hit))
{
gotoAndStop(2,"Scene 1");
removeEventListener(Event.ENTER_FRAME, hitTest1);
}
}
public function setupAsteroid(randomizeY:Boolean = false):void
{
//inline conditional, looks complicated but it's not.
y = randomizeY ? Math.random() * stageRef.stageHeight:0;
x = Math.random() * stageRef.stageWidth;
rotation = Math.random() * 360;
scaleX = Math.random();
scaleY = scaleX;
speed = 20 + Math.random() * 10;
}
public function loop(e:Event):void
{
y += speed;
if (y > stageRef.stageHeight)
{
setupAsteroid();
}
}
}
}