Peter在写这个例子的时候说“Not sure if this is helpful to anybody”，其他人不敢说，不过这个例子刚好是我所需要的–我在做的一个解析ActionScript文件的项目中需要用到这个功能。例子中演示了如何利用URLLoader和URLVariables类，从一个扩展文件中读入一定格式的内容（name/value），根据读入的内容随即显示在DataGrid控件中。
下面是完整代码：
<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.a<a href="https://www.jb51.cc/tag/dob/" target="_blank" class="keywords">dob</a>e.com/2006/mxml" layout="horizontal" verticalAlign="middle" backgroundColor="white" creationComplete="init()"> <mx:Script> <!--[CDATA[ import mx.collections.ArrayCollection; [Bindable] private var VARIABLES_URL:String = "p<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>ms.txt"; [Bindable] private var arrColl:ArrayCollection; [Bindable] private var p<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>mColl:ArrayCollection; private var urlReq:URLRequest; private var urlLdr:URLLoader; private function init():void { /* Initialize the two ArrayCollections objects with empty arrays. */ arrColl = new ArrayCollection(); p<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>mColl = new ArrayCollection(); /* Initialize the URLRequest object with the URL to the file of name/value pa<a href="https://www.jb51.cc/tag/irs/" target="_blank" class="keywords">irs</a>. */ urlReq = new URLRequest(VARIABLES_URL); /* Initialize the URLLoader object,assign the var<a href="https://www.jb51.cc/tag/IoU/" target="_blank" class="keywords">IoU</a>s event listeners,and load the specified URLRequest object. */ urlLdr = new URLLoader(); urlLdr.addEventListener(Event.COMPLETE,doEvent); urlLdr.addEventListener(Event.OPEN,doEvent); urlLdr.addEventListener(HTTPStatusEvent.HTTP_STATUS,doEvent); urlLdr.addEventListener(IOErrorEvent.IO_ERROR,doEvent); urlLdr.addEventListener(ProgressEvent.PROGRESS,doEvent); urlLdr.addEventListener(S<a href="https://www.jb51.cc/tag/ecurity/" target="_blank" class="keywords">ecurity</a>ErrorEvent.S<a href="https://www.jb51.cc/tag/ecurity/" target="_blank" class="keywords">ecurity</a>_ERROR,doEvent); urlLdr.load(urlReq); } private function doEvent(evt:Event):void { arrColl.addItem({type:evt.type,idx:arrColl.length+1,eventString:evt.toString()}); switch (evt.type) { case Event.COMPLETE: /* If the load was successful,create a <a href="https://www.jb51.cc/tag/urlvariables/" target="_blank" class="keywords">urlvariables</a> object from the URLLoader.data property and populate the p<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>mColl ArrayCollection object. */ var ldr:URLLoader = evt.currentTarget as URLLoader; var vars:<a href="https://www.jb51.cc/tag/urlvariables/" target="_blank" class="keywords">urlvariables</a> = new <a href="https://www.jb51.cc/tag/urlvariables/" target="_blank" class="keywords">urlvariables</a>(ldr.data); var key:String; for (key in vars) { p<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>mColl.addItem({key:key,value:vars[key]}); } p<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>ms.visible = true; break; } } ]]--> </mx:Script> <mx:V<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>> <mx:Label text="Events:" /> <mx:DataGrid id="events" dataProvider="{arrColl}" rowCount="5"> <mx:columns> <mx:DataGridColumn <a href="https://www.jb51.cc/tag/datafield/" target="_blank" class="keywords">datafield</a>="idx" headerText="#" width="20" /> <mx:DataGridColumn <a href="https://www.jb51.cc/tag/datafield/" target="_blank" class="keywords">datafield</a>="type" headerText="Type" show<a href="https://www.jb51.cc/tag/datatip/" target="_blank" class="keywords">datatip</a>s="true" <a href="https://www.jb51.cc/tag/datatip/" target="_blank" class="keywords">datatip</a>Field="eventString" /> </mx:columns> </mx:DataGrid> </mx:V<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>> <mx:V<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>> <mx:Label text="P<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>meters:" /> <mx:DataGrid id="p<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>ms" dataProvider="{p<a href="https://www.jb51.cc/tag/ara/" target="_blank" class="keywords">ara</a>mColl}" rowCount="5" visible="false"> <mx:columns> <mx:DataGridColumn <a href="https://www.jb51.cc/tag/datafield/" target="_blank" class="keywords">datafield</a>="key" headerText="Key" /> <mx:DataGridColumn <a href="https://www.jb51.cc/tag/datafield/" target="_blank" class="keywords">datafield</a>="value" headerText="Value" /> </mx:columns> </mx:DataGrid> </mx:V<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>> </mx:Application> <!-- Performance optimized by W3 Total Cache. 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