Question

我在理解如何使用AS3以特定方式在函数之间传递属性方面遇到了很多麻烦。如何更改下面的代码，以便deleteButton函数可以从mySelection函数中检索变量myLike？

import flash.ui.Keyboard;
import flash.events.MouseEvent;
import flash.ui.Mouse;

stage.addEventListener(KeyboardEvent.KEY_DOWN, keyPressed);
btnDelete.addEventListener(MouseEvent.CLICK, deleteButton);

function keyPressed(event:KeyboardEvent)
{

    var myLike:String;

    if (event.keyCode==49) {
        myLike = "ice cream";
    }
    else if (event.keyCode==50) {
       myLike = "chocolate milk";
    }
    else if (event.keyCode==51) {
       myLike = "cookies";
    }
    else
    {
        myLike = "nothing";
    }

    mySelection(myLike);
}

function mySelection(myLike)
{
    trace("I select " + myLike + ".");
    deleteButton(myLike);
}

function deleteButton(event:MouseEvent, myLike) {
    trace(myLike + "has been deleted");
}

Answer 1

您正在关注的几个问题是：

myLike

mySelection()

myLike

deleteButton()

myLike

mySelection()

myLike

mySelection()

deleteButton()

您在myLike内有另一个名为deleteButton()的参数，该参数未被使用。此外，当您尝试在deleteButton()内拨打event时，您只会传入一个参数，而deleteButton()则有两个不同的参数：mySelection()和deleteButton()。< / p>

因此，本质上存在一些语法问题，并且您在代码中尝试执行的操作似乎还有其他一些问题，所以我真的需要建议您尝试查找更多内容的教程。一次只做一步的条款。您需要了解范围，全局变量，类，参数等内容。

但就这两个函数而言， in and their of their ，这应该有效：

event

Answer 2

stage.addEventListener(KeyboardEvent.KEY_DOWN, keyPressed);
btnDelete.addEventListener(MouseEvent.CLICK, onButtonClicked);

function keyPressed( event:KeyboardEvent ):void
{
    var myLike:String;

    if (event.keyCode==49) {
        myLike = "ice cream";
    }
    else if (event.keyCode==50) {
       myLike = "chocolate milk";
    }
    else if (event.keyCode==51) {
       myLike = "cookies";
    }
    else
    {
        myLike = "nothing";
    }

    deleteButton( myLike );
}

// presuming your button instance names are the same as the names in the switch statement 
function onButtonClicked( evt:MouseEvent ):void {
    var deleteThis:String = evt.target.name;

    deleteButton( deleteThis );
}

function deleteButton( myLike:String ):void {
    trace(myLike + "has been deleted");
}

此代码实际上并没有删除任何内容。如果要删除单击的按钮，请尝试使用onButtonClicked方法：

function onButtonClicked( evt:MouseEvent ):void {
    var deleteThis:String = evt.target.name;

    // path to the display list your button is in
    removeChild( evt.target );
}

使用AS3中的函数传递和返回变量

2 个答案: