Question

as3.0初学求助：“helloworld”的练习,"访问可能未定义的属性 keyCode"怎么解决，请大师指教！

提示“场景 1, 图层'action', 帧 1，9 行 1119: 访问可能未定义的属性 keyCode (通过 static 类型 flash.events:Event 引用)。”请大神帮我看看哪里有问题，怎么解决？

HelloWorld:
mainText.border = false;
textIn.border = true;

var myGreeter:Greeter = new Greeter();
mainText.text = myGreeter.sayHello("");

function keyPressed(event:Event):void
{
if (event.keyCode == Keyboard.ENTER)
{
mainText.text = myGreeter.sayHello(textIn.text);
}
}

Greeter:

package
{
public class Greeter
{
/**
* Defines the names that should receive a proper greeting.
*/
public static var validNames:Array = ["Sammy","Frank","Dean"];
/**
* Builds a greeting string using the given name.
*/
public function sayHello(userName:String = ""):String
{
var greeting:String;
if (userName == "")
{
greeting = "Hello. Please type your user name, and then press the Enter key.";
}
else if (validName(userName))
{
greeting = "Hello, " + userName + ".";
}
else
{
greeting = "Sorry, " + userName + ", you are not on the list.";
}
return greeting;
}
/**
* Checks whether a name is in the validNames list.
*/
public static function validName(inputName:String = ""):Boolean
{
if (validNames.indexOf(inputName) > -1)
{
return true;
}
else
{
return false;
}
}
}
}
helloworld:里还有侦听事件没写，现在补上：
textIn.addEventListener(KeyboardEvent.KEY_UP, keyPressed);

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Answer 1

function keyPressed(event:Event):void

改成
function keyPressed(event:KeyboardEvent):void