我是动作脚本的新手，我之前曾使用过OOP语言，但我遇到了一个问题，我必须为图书馆制作一本小册子，他们以XML格式递交了他们的书籍数据。我建了两个班：书和图书馆。
Book.as：
package
{
import flash.display.Sprite;
import flash.net.URLLoader;
import flash.net.URLRequest;
import flash.display.Loader;
import flash.events.Event;
import flash.display.Sprite
public class Book extends Sprite
{
public var _author_name:String;
public var _book_title:String;
public var _book_subject:String;
public var _book_edition:String;
public var _ISBN: String;
public var _publication_year:String;
public var _price:String;
public var _in_stock:String;
public var _book_cover:String;
public function Book()
{
}
public function getAuthorName():String
{
return _author_name;
}
public function getBookTitle():String
{
return _book_title;
}
public function getBookSubject():String
{
return _book_subject;
}
public function getBookEdition():String
{
return _book_edition;
}
public function getISBN():String
{
return _ISBN;
}
public function getPublicationYear():String
{
return _publication_year;
}
public function getPrice():String
{
return _price;
}
public function getAvailability():String
{
return _in_stock;
}
public function getBookCover():String
{
return _book_cover;
}
public function setBookCover(temp:String):void
{
_book_cover = temp;
}
public function setAvailability(temp:String):void
{
_in_stock = temp;
}
public function setPrice(temp:String):void
{
_price = temp;
}
public function setPublicationYear(temp:String):void
{
_publication_year = temp;
}
public function setISBN(temp:String):void
{
_ISBN = temp;
}
public function setBookEdition(temp:String):void
{
_book_edition = temp;
}
public function setBookSubject(temp:String):void
{
_book_subject = temp;
}
public function setBookTitle(temp:String):void
{
_book_title = temp;
}
public function setAuthorName(temp:String):void
{
_author_name = temp;
}
public override function toString():String
{
var book_desc:String;
book_desc = "Author Name: " + _author_name + "\n";
book_desc = book_desc + "Title: " + _book_title + "\n";
book_desc = book_desc + "Subject: " +_book_subject + "\n";
book_desc = book_desc + "Edition : " +_book_edition + "\n";
book_desc = book_desc + "ISBN: " +_ISBN + "\n";
book_desc = book_desc + "Publication Year: " + _publication_year + "\n";
book_desc = book_desc + "Price: " + _price + "\n";
book_desc = book_desc + "Available: " +_in_stock + "\n";
book_desc = book_desc + "Book Cover URL : " +_book_cover + "\n";
return book_desc;
}
public function equals(temp:Book):Boolean
{
if(_ISBN == temp.getISBN())
return true;
else
return false;
}
}
}
Library.as
package
{
import flash.net.URLLoader;
import flash.net.URLRequest;
import flash.display.Loader;
import flash.events.Event;
import flash.display.Sprite;
import flash.display.Sprite
public class Library extends Sprite
{
public var xml:XML;
public var url_loader:URLLoader;
public var _book_vector:Vector.<Book>
public var _xml_path:String;
public function Library(xml_path:String)
{
_xml_path = xml_path;
_book_vector = new Vector.<Book>(20);
}
public function getXMLPath():String
{
return _xml_path;
}
public function setXMLPath(temp:String):void
{
_xml_path = temp;
}
public function LoadXML():void
{
url_loader = new URLLoader(new URLRequest(_xml_path));
url_loader.addEventListener(Event.COMPLETE,ParseXML);
}
public function ParseXML(temp:Event):void
{
xml = new XML(temp.target.data);
LoadBooks();
}
public function LoadBooks():void
{
for(var i :int=0;i<xml.children().length();i++ )
{
_book_vector[i] = new Book();
_book_vector[i]._author_name = xml.children()[i].AuthorName;
_book_vector[i]._book_title = xml.children()[i].BookTitle;
_book_vector[i]._book_subject = xml.children()[i].Subject;
_book_vector[i]._book_edition = xml.children()[i].Edition;
_book_vector[i]._price = xml.children()[i].Price;
_book_vector[i]._publication_year = xml.children()[i].Year;
_book_vector[i]._in_stock = xml.children()[i].Availabilty;
_book_vector[i]._book_cover = xml.children()[i].ImagePath;
_book_vector[i]._ISBN = xml.children()[i].@ISBN;
}
}
public function printLibrary():void
{
for(var i:int=0;i<this._book_vector.length;i++)
{
trace(_book_vector[i].toString());
}
}
}
}
XML加载很好，但是当我尝试调用printLibrary（）时，它会出现问题：错误＃1009：无法访问空对象引用的属性或方法。
当我使用调试器时，我可以看到_book_vector正在加载“Books”并以XML读取数据形式存档，但是当LoadBooks退出时，矢量不再保留它们，为什么？ _book_vector不是函数的本地！我做错了什么？有什么我没有得到正确的？
答案 0 :(得分：0)
试
new Vector.<Book>(20);
而不是
new Vector().<Book>(20);
使用new Vector()...给出了这个错误：
[Fault] exception, information=TypeError: Error #1007: Instantiation attempted on a non-constructor.
但这可能是因为我的错误处理程序更加严格。