stage.width：值舞台上所有元件摆放后的实际宽度。 

比如下面的例子（stage.stageWidth是650，stage.width是150）

package
{
	import flash.display.Sprite;
	
	[SWF(width="650", height="270")]
	public class StageTest extends Sprite
	{
		public function StageTest()
		{
			super();
			
			this.graphics.beginFill(0x00ffff);
			this.graphics.drawRect(50,50,150,150);
			this.graphics.endFill();
			
			trace(stage.stageWidth + " " + stage.width); //650 150
		}
	}
}