blocks|key|2009474|text|如果您想通过在actionscript+2中创建一个subclass来做到这一点，下面是来自Adobe的一个很好的逐步教程。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2009475|http://www.adobe.com/devnet/flash/articles/mc_subclasses_v2_04.html|2009476|本教程指导您添加onEnterFrame事件处理程序，但您可以忽略它，只需将以下代码添加到构造函数中即可。|2009477|如果您的类名是Ball，那么代码将如下所示。(这来自本教程的步骤4)。|2009478|dynamic+class+Ball+extends+MovieClip+{

++function+Ball()+{
++++this._alpha+=+0;
++}
}|code-block|syntax|javascript|2009479|entityMap|0|LINK|mutability|MUTABLE|url^0|Q|8|0|0|1V|0|0|0|7|4|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|10|8|@]|D|@$9|11|A|12|1|13]]|E|$]]|$1|H|3|I|5|6|7|14|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|15|8|@$9|16|A|17|B|C]]|D|@]|E|$]]|$1|L|3|M|5|N|7|18|8|@]|D|@]|E|$O|P]]|$1|Q|3|-4|5|6|7|19|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|G]]]]

If you want to do this by creating a <code>subclass</code> in actionscript 2, here's a great step-by-step tutorial from Adobe.

<a href="http://www.adobe.com/devnet/flash/articles/mc_subclasses_v2_04.html" rel="nofollow noreferrer">http://www.adobe.com/devnet/flash/articles/mc_subclasses_v2_04.html</a>

The tutorial instructs you to add an onEnterFrame event handler, but you can ignore that and simply add the following code to the constructor.

If your classname is <code>Ball</code> then the code would look like this. (this is from step 4 in the tutorial).

<pre><code>dynamic class Ball extends MovieClip {

 function Ball() {
 this._alpha = 0;
 }
}
</code></pre>

blocks|key|961763|text|也许有些事情我没有正确理解，但你只需要在你的第一帧上写这样的东西：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|961764|yourFirstMovieClip._alpha+=+0;
yourSecondMovieClip._alpha+=+0;|code-block|syntax|javascript|961765|961766|如果您的MovieClips名称已编号(mc0、mc1、mc2、mc3.)，则可以使用一个循环将_alpha属性设置为每个剪辑。假设您有5个剪辑(mc0到mc4)：|961767|​|961768|for(+var+i:Number+=+0++;++i+<+5++;++i%2B%2B+)
{
++++this["mc"%2Bi]._alpha+=+0;
}|961769|961770|961771|如果不是，您可以将所有剪辑存储在Array中，然后循环遍历：|961772|var+clips:Array+=+[mcFirst,+mcSecond,+mcThird,+mcFourth];
for(+var+i:Number+=+0++;++i+<+clips.length++;++i%2B%2B+)
{
+++clips[i]._alpha+=+0;
}|961773|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|W|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|Z|8|@]|9|@]|A|$]]|$1|L|3|M|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|N|3|-4|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|K|5|6|7|12|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|13|8|@]|9|@]|A|$]]|$1|R|3|S|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|T|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|U|$]]

Maybe there's something I didn't understood correctly, but you just have to write something like this on your first frame :

<pre><code>yourFirstMovieClip._alpha = 0;
yourSecondMovieClip._alpha = 0;
</code></pre>

 <hr>
If your MovieClips names are numbered (mc0, mc1, mc2, mc3...), you can use a loop to set the _alpha property to every clips.
Let say you have 5 clips (mc0 to mc4) :

<pre><code>for( var i:Number = 0 ; i &lt; 5 ; i++ )
{
 this["mc"+i]._alpha = 0;
}
</code></pre>

 <hr>

If not, you can store every clips in an Array and them loop through it :

<pre><code>var clips:Array = [mcFirst, mcSecond, mcThird, mcFourth];
for( var i:Number = 0 ; i &lt; clips.length ; i++ )
{
 clips[i]._alpha = 0;
}
</code></pre>

blocks|key|2009488|text|我现在正在使用这个代码，它可以做我想做的事情。但我讨厌它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2009489|++++var+once:Boolean;

++++if+(once+==+null)+{
++++++++once+=+true;
++++++++this._alpha+=+0;
++++}|code-block|syntax|javascript|2009490|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I am now using this code, which does what i want. But i hate it.

<pre><code> var once:Boolean;

 if (once == null) {
 once = true;
 this._alpha = 0;
 }
</code></pre>

blocks|key|961785|text|另一种解决方案可能是将这一行放在MovieClip的第一帧上：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|961786|_alpha+=+0;|code-block|syntax|javascript|961787|在第二个框架上启动您的动画，并在最后一个框架上添加以下行：|961788|gotoAndPlay(+2+);|961789|因此，第一帧上的代码只执行一次。|961790|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Another solution may be to put this line on the first frame of your MovieClip :

<pre><code>_alpha = 0;
</code></pre>

Start your animation on the second frame, and add the following line on your last one :

<pre><code>gotoAndPlay( 2 );
</code></pre>

So the code on the first frame is only executed one time.

I want to make a movieclip invisible initially but i dont want to set it manually within the properties in flash because i cant then see it on the scene.

I was hoping i could add some code like so:

MC Frame one.

<pre><code>this.onClipEvent(load)
{
this._alpha = 0;
}
</code></pre>

but I cannot. How can i set the MC _alpha to 0 for all instances without adding it manually to each instance or setting it in the properties?

edit: or creating a class for it just to set the alpha.

Flash: dynamically adding events code to instances possible?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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