AS3- Fader Tween 只处理一些电影剪辑，但不是全部

Question

这是我第一次使用 ActionScript 编写网站。该网站的构建方式非常简单，有五个主要页面，它们通过静态导航栏上的按钮连接（第一页，主页，没有相应的按钮）。其中两个页面（故事和人物）正确淡入，没有问题。但是其他两个页面（The World 和 Extras）没有淡入，他们只是跳转到页面，我得到这个错误：

 TypeError: Error #1009: Cannot access a property or method of a null object reference.  
    at fl.transitions::Tween/setPosition()  
    at fl.transitions::Tween/set position()  
    at fl.transitions::Tween()  
    at Gowang_fla::MainTimeline/frame85()  
    at flash.display::Sprite/constructChildren()  
    at flash.display::Sprite()  
    at flash.display::MovieClip()  
    at flash.display::MovieClip/gotoAndStop()  
    at Gowang_fla::MainTimeline/clickExtras()

我被告知要检查并确保我的所有命名都是正确的，据我所知，一切都是正确的。影片剪辑的标记方式与代码中引用它们的方式相同，但只有四分之二的工作。当我对另外两个使用相同的代码和命名约定时，为什么只有 twop 起作用？

如果有人可以提供帮助，我将不胜感激。

~Here is the .FLA:

~这是我在与我要淡出的页面对应的每个框架标签上使用的代码：

var storyTween:Tween = new Tween(story_mc, "alpha", Regular.easeOut , 0, 1, 2, true);
var worldTween:Tween = new Tween(world_mc, "alpha", Regular.easeOut , 0, 1, 2, true);  
var topTween:Tween = new Tween(top_mc, "alpha", Regular.easeOut , 0, 1, 2, true);
var extrasTween:Tween = new Tween(extras_mc, "alpha", Regular.easeOut , 0, 1, 2, true);      

~这里是网站的完整代码：

stop();

//Fade Effect

import fl.transitions.Tween;
import fl.transitions.easing.*;

var homeTween:Tween = new Tween(home_mc, "alpha", Regular.easeOut , 0, 1, 2, true);

//Buttons

story_btn.addEventListener(MouseEvent.CLICK, clickStory);
world_btn.addEventListener(MouseEvent.CLICK, clickWorld);
characters_btn.addEventListener(MouseEvent.CLICK, clickCharacters);
extras_btn.addEventListener(MouseEvent.CLICK, clickExtras);

home_mc.storyH_btn.addEventListener(MouseEvent.CLICK, clickStoryH);
home_mc.worldH_btn.addEventListener(MouseEvent.CLICK, clickWorldH);
home_mc.charactersH_btn.addEventListener(MouseEvent.CLICK, clickCharactersH);
home_mc.extrasH_btn.addEventListener(MouseEvent.CLICK, clickExtrasH);

top_mc.gowang_btn.addEventListener(MouseEvent.CLICK, clickGowang);
top_mc.ayame_btn.addEventListener(MouseEvent.CLICK, clickAyame);
top_mc.evora_btn.addEventListener(MouseEvent.CLICK, clickEvora);
top_mc.rogin_btn.addEventListener(MouseEvent.CLICK, clickRogin);
top_mc.toraz_btn.addEventListener(MouseEvent.CLICK, clickToraz);
top_mc.naomi_btn.addEventListener(MouseEvent.CLICK, clickNaomi);
top_mc.rummy_btn.addEventListener(MouseEvent.CLICK, clickRummy);
top_mc.teeth_btn.addEventListener(MouseEvent.CLICK, clickTeeth);
top_mc.sichan_btn.addEventListener(MouseEvent.CLICK, clickSichan);

extras_mc.blog_btn.addEventListener(MouseEvent.CLICK, clickBlog);

function clickBlog(event:MouseEvent):void
{
    navigateToURL(new URLRequest("http://www.gowangadventures.blogspot.com"), "_blank");
}

function clickGowang(evtObj:MouseEvent){
gotoAndStop("gowang", "Scene 1");
}
function clickAyame(evtObj:MouseEvent){
gotoAndStop("ayame", "Scene 1");
}
function clickEvora(evtObj:MouseEvent){
gotoAndStop("evora", "Scene 1");
}
function clickRogin(evtObj:MouseEvent){
gotoAndStop("rogin", "Scene 1");
}
function clickToraz(evtObj:MouseEvent){
gotoAndStop("toraz", "Scene 1");
}
function clickNaomi(evtObj:MouseEvent){
gotoAndStop("naomi", "Scene 1");
}
function clickRummy(evtObj:MouseEvent){
gotoAndStop("rummy", "Scene 1");
}
function clickTeeth(evtObj:MouseEvent){
gotoAndStop("teeth", "Scene 1");
}
function clickSichan(evtObj:MouseEvent){
gotoAndStop("sichan", "Scene 1");
}
function clickStory(evtObj:MouseEvent){
gotoAndStop("story");
}
function clickWorld(evtObj:MouseEvent){
gotoAndStop("world");
}
function clickCharacters(evtObj:MouseEvent){
gotoAndStop("characters");
}
function clickExtras(evtObj:MouseEvent){
gotoAndStop("extras");
}
function clickStoryH(evtObj:MouseEvent){
gotoAndStop("story", "Scene 1");
}
function clickWorldH(evtObj:MouseEvent){
gotoAndStop("world", "Scene 1");
}
function clickCharactersH(evtObj:MouseEvent){
gotoAndStop("characters", "Scene 1");
}
function clickExtrasH(evtObj:MouseEvent){
gotoAndStop("extras", "Scene 1");
}

Answer 1

不确定为什么会这样，但似乎无法找到与 extras_mc 的实例名称关联的剪辑。我将您在第 85 帧上的代码更改为此代码，并且效果很好：

var extras_mc = this.getChildByName('extras_mc')
var extrasTween:Tween = new Tween(extras_mc, "alpha", Regular.easeOut, 0, 1, 2, true);