Question

FLASH中TypeError: Error #1009: 无法访问空对象引用的属性或方法.

import flash.display.MovieClip;
import flash.events.MouseEvent;
import flash.display.SimpleButton;

mc1.buttonMode = true;
mc2.buttonMode = true;
mc3.buttonMode = true;

var chk2 = false;
var myNum2 = 0;
var center2 = mc2.x;
//var bg:MovieClip;

//bg.gotoAndStop(1);
//bg.addEventListener(MouseEvent.CLICK, bgclick);

for (var j = 1; j < 4; j++) {
this["mc" + j].trgScale = 1.1;
this["mc" + j].addEventListener(MouseEvent.MOUSE_OUT, mouseout2);
}

mc1.addEventListener(MouseEvent.MOUSE_OVER, imouse1);
mc2.addEventListener(MouseEvent.MOUSE_OVER, imouse2);
mc3.addEventListener(MouseEvent.MOUSE_OVER, imouse3);

function imouse1(event: MouseEvent) {
mouseover2(1);
}
function imouse2(event: MouseEvent) {
mouseover2(2);
}
function imouse3(event: MouseEvent) {
mouseover2(3);
}

function mouseover2(j: Number) {
chk2 = true;
myNum2 = j;
}

function mouseout2(event: MouseEvent) {
chk2 = false;
reset2();
}

function reset2() {
for (j = 1; j < 4; j++) {
this["mc" + j].trgScale = 1.1; 错误出现处！！！！！！！！！！

}
myNum2 = 2;

错误为：
TypeError: Error #1009: 无法访问空对象引用的属性或方法。
at 首页_fla::导航_3/fangdacaidan()[首页_fla.导航_3::frame1:156]

Answer 1

以前转换失败是返回null，现在转换失败后将抛出一个类型错误（TypeError）。当尝试转换两种对立的数据类型的时候就会失败。警告程序员发生了冲突, 升级flash 后，f5刷新，或者重启。

追问

什么意思啊？好像并不能解决我的问题啊