Question

我是AS3的新手，如果这是完全基本的东西，请道歉，但我无法从我的代码中获得任何输出。我正在尝试制作Flash游戏并尝试测试此代码段以确保Flash正在接收用户的键盘输入。如上所述，我没有得到任何错误，但我也没有在输出窗口中得到任何东西。我敢肯定我错过了其他人明显的东西。如果有人知道可能出现什么问题，我将非常感激。这是代码：

import flash.events.EventDispatcher;
import flash.events.Event;
import flash.events.KeyboardEvent;

    function keyDownHandler(event:KeyboardEvent):void
    {
    if(event.keyCode == Keyboard.LEFT)
    {
        trace("left pressed");
    }
    else if(event.keyCode == Keyboard.RIGHT)
    {
        trace("right pressed");
    } 
    else if(event.keyCode == Keyboard.UP)
    {
        trace("up pressed");
    }
    else if(event.keyCode == Keyboard.DOWN)
    {
        trace("down pressed");
    }

    stage.addEventListener(KeyboardEvent.KEY_DOWN,keyDownHandler);

    }
    function keyUpHandler(event:KeyboardEvent):void
    {
    if(event.keyCode == Keyboard.LEFT)
    {
        trace("left released");
    }
    else if(event.keyCode == Keyboard.RIGHT)
    {
        trace("right released");
    }
    else if(event.keyCode == Keyboard.UP)
    {
        trace("up released");
    }
    else if(event.keyCode == Keyboard.DOWN)
    {
        trace("down released");
    }  

        stage.addEventListener(KeyboardEvent.KEY_UP,keyUpHandler);

   }

Answer 1

您的侦听器永远不会注册，您可以在密钥处理程序函数中使用它们，这当然不会在没有侦听器的情况下触发，因此不会注册侦听器。您必须将它们移出功能块。

Answer 2

试试这段代码：

import flash.events.EventDispatcher;
import flash.events.Event;
import flash.events.KeyboardEvent;

function keyDownHandler(event:KeyboardEvent):void
{
    if(event.keyCode == Keyboard.LEFT)
    {
        trace("left pressed");
    }
    else if(event.keyCode == Keyboard.RIGHT)
    {
        trace("right pressed");
    } 
    else if(event.keyCode == Keyboard.UP)
    {
        trace("up pressed");
    }
    else if(event.keyCode == Keyboard.DOWN)
    {
        trace("down pressed");
    }
}
stage.addEventListener(KeyboardEvent.KEY_DOWN,keyDownHandler);

function keyUpHandler(event:KeyboardEvent):void
{
    if(event.keyCode == Keyboard.LEFT)
    {
        trace("left released");
    }
    else if(event.keyCode == Keyboard.RIGHT)
    {
        trace("right released");
    }
    else if(event.keyCode == Keyboard.UP)
    {
        trace("up released");
    }
    else if(event.keyCode == Keyboard.DOWN)
    {
        trace("down released");
    }
}
stage.addEventListener(KeyboardEvent.KEY_UP,keyUpHandler);

让我知道这是否有效。

动作脚本3：没有编译器错误，但我无法获得任何输出

2 个答案: