我怎么可以访问根文件以外的阶段？

问题描述

我固定之前哪里出了问题的根源是，阶段是从我在那里把code人迹罕至的（而不是在根目录）这个错误。我删除它，它运行得很好，但是，他们attatched的事件监听器不工作了。我需要这些事件监听器，但是当我试图把'阶段。回盈它不会工作。帮助？

这是什么的时候，它的工作我有（当该文件仍然是根）：

  stage.addEventListener（KeyboardEvent.KEY_DOWN，关键pressed）;
        stage.addEventListener（KeyboardEvent.KEY_UP，调用keyReleased）;
 

现在我的code是这样的，它运行，只是没有事件侦听器的工作：

 的addEventListener（KeyboardEvent.KEY_DOWN，关键pressed）;
        的addEventListener（KeyboardEvent.KEY_UP，调用keyReleased）;
 

解决方案

在期属性空，直到元素添加到了舞台。所以，你应该先听事件 Event.ADDED_TO_STAGE ，当你收到它，您可以将您的其它事件侦听器：

 的addEventListener（Event.ADDED_TO_STAGE，addedToStage）;

功能addedTostage（）：无效
{
    removeEventListener（Event.ADDED_TO_STAGE，addedToStage）;
    stage.addEventListener（KeyboardEvent.KEY_DOWN，关键pressed）;
    stage.addEventListener（KeyboardEvent.KEY_UP，调用keyReleased）;
}
 

I fixed this error before where the source of the problem was that 'stage' was inaccessible from where I was putting the code (not in root). I deleted it and it ran fine, but the Event listeners that they were attatched to did not work anymore. I need these event listeners but when I try to put 'stage.' back infront it wont work. help?

This is what I had when it worked (when this file was still the root):

        stage.addEventListener(KeyboardEvent.KEY_DOWN, keypressed);
        stage.addEventListener(KeyboardEvent.KEY_UP, keyreleased);

Now my code is this, and it runs, just without the event listeners working:

        addEventListener(KeyboardEvent.KEY_DOWN, keypressed);
        addEventListener(KeyboardEvent.KEY_UP, keyreleased);

解决方案

The stage property is null until the element is added to the stage. So you should first listen to the event Event.ADDED_TO_STAGE, and when you receive it, you can add your other event listeners:

addEventListener(Event.ADDED_TO_STAGE, addedToStage);

function addedTostage():void
{
    removeEventListener(Event.ADDED_TO_STAGE, addedToStage);
    stage.addEventListener(KeyboardEvent.KEY_DOWN, keypressed);
    stage.addEventListener(KeyboardEvent.KEY_UP, keyreleased);
}

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