EMChatMessage 成员列表

成员的完整列表，这些成员属于 EMChatMessage,包括所有继承而来的类成员

	body	EMChatMessage
	chatThread	EMChatMessage
	chatType	EMChatMessage
	conversationId	EMChatMessage
	direction	EMChatMessage
	ext	EMChatMessage
	from	EMChatMessage
-	getReaction:	EMChatMessage
	groupAckCount	EMChatMessage
-	initWithConversationID:body:ext:	EMChatMessage
-	initWithConversationID:from:to:body:ext:	EMChatMessage
	isChannelMessage (定义于 EMChatMessage)	EMChatMessage
	isChatThreadMessage	EMChatMessage
	isDeliverAcked	EMChatMessage
	isListened	EMChatMessage
	isNeedGroupAck	EMChatMessage
	isRead	EMChatMessage
	isReadAcked	EMChatMessage
	localTime	EMChatMessage
	messageId	EMChatMessage
	onlineState	EMChatMessage
	priority	EMChatMessage
	reactionList	EMChatMessage
	status	EMChatMessage
	timestamp	EMChatMessage
	to	EMChatMessage