ActionScript3检测操作系统

package { import flash.display.Sprite; import flash.system.Capabilities; import flash.text.TextField; public class EnvironmentTest extends Sprite {    public function EnvironmentTest()    {      var textfield:TextField;         //检测操作系统     var os:String=flash.system.Capabilities.os.substr(0,3);         //检查播放器类型     var playertype:String=flash.system.Capabilities.playerType;         //检测系统语言     var lang:String=flash.system.Capabilities.language;         //检测屏幕分辨率     var screenx:int=flash.system.Capabilities.screenResolutionX;     var screeny:int=flash.system.Capabilities.screenResolutionY;     var screencolor=flash.system.Capabilities.screenColor;         textfield=new TextField();     textfield.text="os: "+os+"\r\n"+"playertype: "+playertype+"\r\n"+"lang: "+lang+"\r\n"                            +"x:y:color: "+screenx.toString()+":"+screeny.toString()+":"+screencolor+"\r\n";             this.addChild(textfield);                } } }