EMChatThread 成员列表

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

	createAt	EMChatThread
	lastMessage	EMChatThread
	membersCount	EMChatThread
	messageCount	EMChatThread
	messageId	EMChatThread
	owner	EMChatThread
	parentId	EMChatThread
	threadId	EMChatThread
	threadName	EMChatThread