在AS3中，URLLoader.close（）;(In AS3, does URLLoader.close(); cause problems if nothing is being loaded?)

 我不确定到底发生了什么，但确实找出了URLLoader.close(); 是原因。 
 
 我有一个简单的应用程序，用户将信息输入文本框，然后我将该信息发送到PHP脚本并返回输出。 收到输出后，您可以单击重置应用程序的新按钮。 错误在于单击该按钮后执行的功能。 
 
 如果单击该按钮重置应用程序，它将重置所有变量等，但似乎我的addEventListener方法不会执行。 
 
 这是重置功能： 
 
//Reset function if the Reset button is pressed
function clearApplication(e:MouseEvent):void {
    receivedData="";
    data1TextBox.text="";
    data2TextBox.text="";
    resetButton.visible=false;
    resetButton.removeEventListener(MouseEvent.CLICK, clearApplication, false);
    goButton.visible=true;
    goButton.addEventListener(MouseEvent.CLICK, getData, false, 0, true);
    myLoader.close();
}
 
 执行此操作后，我的goButton不再有效。 
 
 如果单击goButton ，它应执行以下操作： 
 
function getData(e:MouseEvent):void {
    if (data1TextBox.text!=""&&data2TextBox.text!="") {
        goButton.removeEventListener(MouseEvent.CLICK, getData, false);
        goButton.visible=false;

        postVars = new URLVariables();
        postVars.data1=data1TextBox.text;
        postVars.data2=data2TextBox.text;

        myRequest=new URLRequest("URL");
        myRequest.method=URLRequestMethod.POST;
        myRequest.data=postVars;

        myLoader.addEventListener(Event.COMPLETE, onComplete, false, 0, true);
        myLoader.load(myRequest);
    }
}
 
 最后，onComplete函数： 
 
function onComplete(e:Event):void {
    receivedData=e.target.data;

    outputTextBox.text=receivedData;

    resetButton.visible=true;
    resetButton.addEventListener(MouseEvent.CLICK, clearApplication, false, 0, true);
}
 
 请注意，未在函数内声明的任何变量都是全局声明的。 
 
 所以，我偶然发现了如果我删除myLoader.close(); 从clearApplication函数，然后一切顺利。 如果填写了所有文本字段，我的goButton没有问题并按预期执行。 
 
 我知道如果当前没有任何东西被加载是没有必要的，但它是存在的，因为我从来不知道它是否会挂起并需要被取消。 为什么myLoader.close(); 导致这样的事情发生？ 
 
 编辑：对不起，尝试简化我的代码示例时犯了一些错误。 

I am not sure exactly is happening here but did figure out that URLLoader.close(); is the cause.
 
I have a simple application whereby a user enters info into a textbox, then I send that info to a PHP script and return output. After output is received, you can click a new button that resets the application. The error lies with the function that executes after that button is clicked.
 
If you click that button to reset the application, it resets all variables, etc, but then it seems my addEventListener method does not execute.
 
Here is the reset function:
 
//Reset function if the Reset button is pressed
function clearApplication(e:MouseEvent):void {
    receivedData="";
    data1TextBox.text="";
    data2TextBox.text="";
    resetButton.visible=false;
    resetButton.removeEventListener(MouseEvent.CLICK, clearApplication, false);
    goButton.visible=true;
    goButton.addEventListener(MouseEvent.CLICK, getData, false, 0, true);
    myLoader.close();
}
 
After this executes, my goButton no longer works.
 
If the goButton is clicked, it should execute the following:
 
function getData(e:MouseEvent):void {
    if (data1TextBox.text!=""&&data2TextBox.text!="") {
        goButton.removeEventListener(MouseEvent.CLICK, getData, false);
        goButton.visible=false;

        postVars = new URLVariables();
        postVars.data1=data1TextBox.text;
        postVars.data2=data2TextBox.text;

        myRequest=new URLRequest("URL");
        myRequest.method=URLRequestMethod.POST;
        myRequest.data=postVars;

        myLoader.addEventListener(Event.COMPLETE, onComplete, false, 0, true);
        myLoader.load(myRequest);
    }
}
 
And finally, the onComplete function:
 
function onComplete(e:Event):void {
    receivedData=e.target.data;

    outputTextBox.text=receivedData;

    resetButton.visible=true;
    resetButton.addEventListener(MouseEvent.CLICK, clearApplication, false, 0, true);
}
 
Note that any variables not declared within the functions are declared globally.
 
So, I stumbled upon the fact that if I delete myLoader.close(); from the clearApplication function then everything works smoothly. My goButton has no issues and executes as expected if all text fields are filled in.
 
I know it is not necessary if nothing is currently being loaded, but it is there since I never know if it is going to hang and needs to be canceled. Why would myLoader.close(); cause something like this to happen?
 
Edit: Sorry, made a few mistakes trying to simplify my code for the example.

原文：https://stackoverflow.com/questions/3253293