WEBIM如何处理接收的文件消息？

//处理收到文件消息

	var handleFileMessage = function(message) {

		var filename = message.filename;

		var filetype = message.filetype;

		var from = message.from;



		var mestype = message.type;//消息发送的类型是群组消息还是个人消息

		var contactDivId = from;

		if (mestype == 'groupchat') {

			contactDivId = groupFlagMark + message.to;

		}

		var options = message;

		options.onFileDownloadComplete = function(response, xhr) {

			var spans = "收到文件消息:" + filename;

			appendMsg(from, contactDivId, spans);

			return;

		};

		options.onFileDownloadError = function(e) {

			appendMsg(from, contactDivId, e.msg + ",下载文件" + filename + "失败");

		};

		Easemob.im.Helper.download(options);

	};