为文本添加 换行符

private function openXMLFile(url:String)
		{
			var file:File = new File(url);
			var fileStream:FileStream = new FileStream();
			fileStream.open(file, FileMode.READ);
			xml_data += "\\r"+ fileStream.readMultiByte(file.size,"utf-8");
			
			fileStream.close();

		}
		
		private function newXml()
		{
			var file:File = new File(directory.nativePath + "A.xml");
			var fileStream:FileStream = new FileStream();
			fileStream.open(file, FileMode.WRITE);
			xml_data = xml_data.replace(/\\r/g, "\r");	
			fileStream.writeMultiByte(xml_data, "utf-8");			
			//fileStream.writeUTFBytes(xml_data);	
			
			fileStream.close();
			//trace(file.nativePath);
			trace("生成");
		}

　　.replace("\n", "\r\n"));//注意windows系统在保存成txt时要将文本中的"\n"修改为"\r\n"才可以实现换行